Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes
<p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) a...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
J. Landgraf [verfasserIn] D. Tetzlaff [verfasserIn] M. Dubbert [verfasserIn] D. Dubbert [verfasserIn] A. Smith [verfasserIn] C. Soulsby [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2022 |
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| Übergeordnetes Werk: |
In: Hydrology and Earth System Sciences - Copernicus Publications, 2005, 26(2022), Seite 2073-2092 |
|---|---|
| Übergeordnetes Werk: |
volume:26 ; year:2022 ; pages:2073-2092 |
| Links: |
Link aufrufen |
|---|
| DOI / URN: |
10.5194/hess-26-2073-2022 |
|---|
| Katalog-ID: |
DOAJ029406854 |
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| 245 | 1 | 0 | |a Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes |
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| 520 | |a <p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< | ||
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10.5194/hess-26-2073-2022 doi (DE-627)DOAJ029406854 (DE-599)DOAJ1694709f689b40158f98462a14c8eb7a DE-627 ger DE-627 rakwb eng TD1-1066 GE1-350 J. Landgraf verfasserin aut Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< Technology T Environmental technology. Sanitary engineering Geography. Anthropology. Recreation G Environmental sciences J. Landgraf verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut M. Dubbert verfasserin aut M. Dubbert verfasserin aut D. Dubbert verfasserin aut A. Smith verfasserin aut C. Soulsby verfasserin aut In Hydrology and Earth System Sciences Copernicus Publications, 2005 26(2022), Seite 2073-2092 (DE-627)36277417X (DE-600)2100610-6 16077938 nnns volume:26 year:2022 pages:2073-2092 https://doi.org/10.5194/hess-26-2073-2022 kostenfrei https://doaj.org/article/1694709f689b40158f98462a14c8eb7a kostenfrei https://hess.copernicus.org/articles/26/2073/2022/hess-26-2073-2022.pdf kostenfrei https://doaj.org/toc/1027-5606 Journal toc kostenfrei https://doaj.org/toc/1607-7938 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2022 2073-2092 |
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10.5194/hess-26-2073-2022 doi (DE-627)DOAJ029406854 (DE-599)DOAJ1694709f689b40158f98462a14c8eb7a DE-627 ger DE-627 rakwb eng TD1-1066 GE1-350 J. Landgraf verfasserin aut Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< Technology T Environmental technology. Sanitary engineering Geography. Anthropology. Recreation G Environmental sciences J. Landgraf verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut M. Dubbert verfasserin aut M. Dubbert verfasserin aut D. Dubbert verfasserin aut A. Smith verfasserin aut C. Soulsby verfasserin aut In Hydrology and Earth System Sciences Copernicus Publications, 2005 26(2022), Seite 2073-2092 (DE-627)36277417X (DE-600)2100610-6 16077938 nnns volume:26 year:2022 pages:2073-2092 https://doi.org/10.5194/hess-26-2073-2022 kostenfrei https://doaj.org/article/1694709f689b40158f98462a14c8eb7a kostenfrei https://hess.copernicus.org/articles/26/2073/2022/hess-26-2073-2022.pdf kostenfrei https://doaj.org/toc/1027-5606 Journal toc kostenfrei https://doaj.org/toc/1607-7938 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2022 2073-2092 |
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10.5194/hess-26-2073-2022 doi (DE-627)DOAJ029406854 (DE-599)DOAJ1694709f689b40158f98462a14c8eb7a DE-627 ger DE-627 rakwb eng TD1-1066 GE1-350 J. Landgraf verfasserin aut Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< Technology T Environmental technology. Sanitary engineering Geography. Anthropology. Recreation G Environmental sciences J. Landgraf verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut M. Dubbert verfasserin aut M. Dubbert verfasserin aut D. Dubbert verfasserin aut A. Smith verfasserin aut C. Soulsby verfasserin aut In Hydrology and Earth System Sciences Copernicus Publications, 2005 26(2022), Seite 2073-2092 (DE-627)36277417X (DE-600)2100610-6 16077938 nnns volume:26 year:2022 pages:2073-2092 https://doi.org/10.5194/hess-26-2073-2022 kostenfrei https://doaj.org/article/1694709f689b40158f98462a14c8eb7a kostenfrei https://hess.copernicus.org/articles/26/2073/2022/hess-26-2073-2022.pdf kostenfrei https://doaj.org/toc/1027-5606 Journal toc kostenfrei https://doaj.org/toc/1607-7938 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2022 2073-2092 |
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10.5194/hess-26-2073-2022 doi (DE-627)DOAJ029406854 (DE-599)DOAJ1694709f689b40158f98462a14c8eb7a DE-627 ger DE-627 rakwb eng TD1-1066 GE1-350 J. Landgraf verfasserin aut Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< Technology T Environmental technology. Sanitary engineering Geography. Anthropology. Recreation G Environmental sciences J. Landgraf verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut D. Tetzlaff verfasserin aut M. Dubbert verfasserin aut M. Dubbert verfasserin aut D. Dubbert verfasserin aut A. Smith verfasserin aut C. Soulsby verfasserin aut In Hydrology and Earth System Sciences Copernicus Publications, 2005 26(2022), Seite 2073-2092 (DE-627)36277417X (DE-600)2100610-6 16077938 nnns volume:26 year:2022 pages:2073-2092 https://doi.org/10.5194/hess-26-2073-2022 kostenfrei https://doaj.org/article/1694709f689b40158f98462a14c8eb7a kostenfrei https://hess.copernicus.org/articles/26/2073/2022/hess-26-2073-2022.pdf kostenfrei https://doaj.org/toc/1027-5606 Journal toc kostenfrei https://doaj.org/toc/1607-7938 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2022 2073-2092 |
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TD1-1066 GE1-350 Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes |
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Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes |
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xylem water in riparian willow trees (<i<salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes |
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Xylem water in riparian willow trees (<i<Salix alba</i<) reveals shallow sources of root water uptake by in situ monitoring of stable water isotopes |
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<p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< |
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<p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< |
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<p<Root water uptake (RWU) is an important critical zone process, as plants can tap various water sources and transpire these back into the atmosphere. However, knowledge about the spatial and temporal dynamics of RWU and associated water sources at both high temporal resolution (e.g. daily) and over longer time periods (e.g. seasonal) is still limited. We used cavity ring-down spectroscopy (CRDS) for continuous in situ monitoring of stable water isotopes in soil and xylem water for two riparian willow (<i<Salix alba</i<) trees over the growing season (May to October) of 2020. This was complemented by isotopic sampling of local precipitation, groundwater, and stream water in order to help constrain the potential sources of RWU. A local eddy flux tower, together with sap flow monitoring, soil moisture measurements, and dendrometry, was also used to provide the hydroclimatic and ecohydrological contexts for in situ isotope monitoring. In addition, respective bulk and twig samples of soil water and xylem water were collected to corroborate the continuous in situ data. The monitoring period was characterised by frequent inputs of precipitation, interspersed by warm dry periods, which resulted in variable moisture storage in the upper 20 cm of the soil profile and dynamic isotope signatures. This variability was greatly damped at 40 cm, and the isotopic composition of the subsoil and groundwater was relatively stable. The isotopic composition and dynamics of xylem water were very similar to those of the upper soil, and analysis using a Bayesian mixing model inferred that overall <span class="inline-formula"<∼90</span< % of RWU was derived from the upper soil profile. However, while for the soil water signatures, the direct equilibrium method showed good comparability with in situ results, for xylem water, the cryogenic extractions signatures were only moderately or not at all comparable. Sap flow and dendrometry data indicated that soil water availability did not seriously limit transpiration during the study period, though it seemed that deeper (<span class="inline-formula"<>40</span< cm) soil water provided a higher proportion of RWU (<span class="inline-formula"<∼30</span< %) in a drier period in the late summer. The study demonstrates the utility of prolonged real-time monitoring of natural stable isotope abundance in soil–vegetation systems, which has great potential for the further understanding of ecohydrological partitioning under changing hydroclimatic conditions.</p< |
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