Structural equation modeling reveals complex relationships in mixed forage swards
Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separ...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
McLeod, Erin M. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015transfer abstract |
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| Schlagwörter: |
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| Umfang: |
8 |
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| Übergeordnetes Werk: |
Enthalten in: Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens - Kala, Smriti ELSEVIER, 2018, Amsterdam [u.a.] |
|---|---|
| Übergeordnetes Werk: |
volume:78 ; year:2015 ; pages:106-113 ; extent:8 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.cropro.2015.08.019 |
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| 520 | |a Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. | ||
| 520 | |a Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. | ||
| 650 | 7 | |a Competition |2 Elsevier | |
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| 650 | 7 | |a Forage response |2 Elsevier | |
| 700 | 1 | |a Banerjee, Samiran |4 oth | |
| 700 | 1 | |a Bork, Edward W. |4 oth | |
| 700 | 1 | |a Hall, Linda M. |4 oth | |
| 700 | 1 | |a Hare, Donald D. |4 oth | |
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10.1016/j.cropro.2015.08.019 doi GBVA2015008000030.pica (DE-627)ELV028869427 (ELSEVIER)S0261-2194(15)30095-8 DE-627 ger DE-627 rakwb eng 630 580 630 DE-600 580 DE-600 610 VZ PHARM DE-84 fid 15,3 ssgn 44.43 bkl McLeod, Erin M. verfasserin aut Structural equation modeling reveals complex relationships in mixed forage swards 2015transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Competition Elsevier Facilitation Elsevier Relative yield ratio Elsevier Weed density Elsevier Canada thistle Elsevier Forage response Elsevier Banerjee, Samiran oth Bork, Edward W. oth Hall, Linda M. oth Hare, Donald D. oth Enthalten in Elsevier Kala, Smriti ELSEVIER Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens 2018 Amsterdam [u.a.] (DE-627)ELV000917710 volume:78 year:2015 pages:106-113 extent:8 https://doi.org/10.1016/j.cropro.2015.08.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-PHARM SSG-OLC-PHA SSG-OPC-PHA 44.43 Medizinische Mikrobiologie VZ AR 78 2015 106-113 8 045F 630 |
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10.1016/j.cropro.2015.08.019 doi GBVA2015008000030.pica (DE-627)ELV028869427 (ELSEVIER)S0261-2194(15)30095-8 DE-627 ger DE-627 rakwb eng 630 580 630 DE-600 580 DE-600 610 VZ PHARM DE-84 fid 15,3 ssgn 44.43 bkl McLeod, Erin M. verfasserin aut Structural equation modeling reveals complex relationships in mixed forage swards 2015transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Competition Elsevier Facilitation Elsevier Relative yield ratio Elsevier Weed density Elsevier Canada thistle Elsevier Forage response Elsevier Banerjee, Samiran oth Bork, Edward W. oth Hall, Linda M. oth Hare, Donald D. oth Enthalten in Elsevier Kala, Smriti ELSEVIER Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens 2018 Amsterdam [u.a.] (DE-627)ELV000917710 volume:78 year:2015 pages:106-113 extent:8 https://doi.org/10.1016/j.cropro.2015.08.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-PHARM SSG-OLC-PHA SSG-OPC-PHA 44.43 Medizinische Mikrobiologie VZ AR 78 2015 106-113 8 045F 630 |
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10.1016/j.cropro.2015.08.019 doi GBVA2015008000030.pica (DE-627)ELV028869427 (ELSEVIER)S0261-2194(15)30095-8 DE-627 ger DE-627 rakwb eng 630 580 630 DE-600 580 DE-600 610 VZ PHARM DE-84 fid 15,3 ssgn 44.43 bkl McLeod, Erin M. verfasserin aut Structural equation modeling reveals complex relationships in mixed forage swards 2015transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Competition Elsevier Facilitation Elsevier Relative yield ratio Elsevier Weed density Elsevier Canada thistle Elsevier Forage response Elsevier Banerjee, Samiran oth Bork, Edward W. oth Hall, Linda M. oth Hare, Donald D. oth Enthalten in Elsevier Kala, Smriti ELSEVIER Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens 2018 Amsterdam [u.a.] (DE-627)ELV000917710 volume:78 year:2015 pages:106-113 extent:8 https://doi.org/10.1016/j.cropro.2015.08.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-PHARM SSG-OLC-PHA SSG-OPC-PHA 44.43 Medizinische Mikrobiologie VZ AR 78 2015 106-113 8 045F 630 |
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10.1016/j.cropro.2015.08.019 doi GBVA2015008000030.pica (DE-627)ELV028869427 (ELSEVIER)S0261-2194(15)30095-8 DE-627 ger DE-627 rakwb eng 630 580 630 DE-600 580 DE-600 610 VZ PHARM DE-84 fid 15,3 ssgn 44.43 bkl McLeod, Erin M. verfasserin aut Structural equation modeling reveals complex relationships in mixed forage swards 2015transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Competition Elsevier Facilitation Elsevier Relative yield ratio Elsevier Weed density Elsevier Canada thistle Elsevier Forage response Elsevier Banerjee, Samiran oth Bork, Edward W. oth Hall, Linda M. oth Hare, Donald D. oth Enthalten in Elsevier Kala, Smriti ELSEVIER Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens 2018 Amsterdam [u.a.] (DE-627)ELV000917710 volume:78 year:2015 pages:106-113 extent:8 https://doi.org/10.1016/j.cropro.2015.08.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-PHARM SSG-OLC-PHA SSG-OPC-PHA 44.43 Medizinische Mikrobiologie VZ AR 78 2015 106-113 8 045F 630 |
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10.1016/j.cropro.2015.08.019 doi GBVA2015008000030.pica (DE-627)ELV028869427 (ELSEVIER)S0261-2194(15)30095-8 DE-627 ger DE-627 rakwb eng 630 580 630 DE-600 580 DE-600 610 VZ PHARM DE-84 fid 15,3 ssgn 44.43 bkl McLeod, Erin M. verfasserin aut Structural equation modeling reveals complex relationships in mixed forage swards 2015transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. Competition Elsevier Facilitation Elsevier Relative yield ratio Elsevier Weed density Elsevier Canada thistle Elsevier Forage response Elsevier Banerjee, Samiran oth Bork, Edward W. oth Hall, Linda M. oth Hare, Donald D. oth Enthalten in Elsevier Kala, Smriti ELSEVIER Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens 2018 Amsterdam [u.a.] (DE-627)ELV000917710 volume:78 year:2015 pages:106-113 extent:8 https://doi.org/10.1016/j.cropro.2015.08.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-PHARM SSG-OLC-PHA SSG-OPC-PHA 44.43 Medizinische Mikrobiologie VZ AR 78 2015 106-113 8 045F 630 |
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Structural equation modeling reveals complex relationships in mixed forage swards |
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Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. |
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Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. |
| abstract_unstemmed |
Relationships among vegetation components in perennial pastures are complex, particularly those including grasses, weeds, legumes, and other forbs. Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production. |
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Where herbicides are used for broadleaf weed control, a trade-off may exist between the benefits of weed removal and legume loss. Few studies have separated the contribution of different vegetation components to total forage yield, either prior to or after spraying. Herein we use Structural Equation Modelling (SEM) to quantify relationships among grasses, legumes (Medicago sativa L. or Trifolium spp.), a common noxious weed (Cirsium arvense (L.) Scop), and other forbs, at two locations within the Parkland region of central Alberta, Canada. After removal of broadleaf vegetation with herbicide, we quantified changes in forage relative yield ratio (RYR) for two years. The SEM approach revealed marked differences in the relationships among sward components between sites. At the more mesic site, abundant thistle biomass had little influence on other sward components and no benefit was observed post-spraying from weed removal. In contrast, even low levels of thistle biomass suppressed grass and legume biomass at the more xeric location, and post-spraying responses revealed benefits from weed removal. Unexpectedly, legumes were found to suppress grass biomass at both sites, suggesting strong interspecific competition between forage types. Subsequent removal of legumes appeared to release grass biomass from competition within sprayed plots, as exemplified by increased forage yields two years after spraying. These results highlight the complexity within temperate perennial pastures, and add clarification to the potential short-term impacts of weeds and legumes to overall sward dynamics and forage production.</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Competition</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Facilitation</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Relative yield ratio</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Weed density</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Canada thistle</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Forage response</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Banerjee, Samiran</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Bork, Edward W.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Hall, Linda M.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Hare, Donald D.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="n">Elsevier</subfield><subfield code="a">Kala, Smriti ELSEVIER</subfield><subfield code="t">Improving the clinical relevance of a mouse pregnancy model of antiretroviral toxicity; a pharmacokinetic dosing-optimization study of current HIV antiretroviral regimens</subfield><subfield code="d">2018</subfield><subfield code="g">Amsterdam [u.a.]</subfield><subfield code="w">(DE-627)ELV000917710</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:78</subfield><subfield code="g">year:2015</subfield><subfield code="g">pages:106-113</subfield><subfield code="g">extent:8</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://doi.org/10.1016/j.cropro.2015.08.019</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ELV</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">FID-PHARM</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-PHA</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OPC-PHA</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">44.43</subfield><subfield code="j">Medizinische Mikrobiologie</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">78</subfield><subfield code="j">2015</subfield><subfield code="h">106-113</subfield><subfield code="g">8</subfield></datafield><datafield tag="953" ind1=" " ind2=" "><subfield code="2">045F</subfield><subfield code="a">630</subfield></datafield></record></collection>
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