Effects of superabsorbent polymers (SAPs) incorporated with organic and inorganic fertilizer on the water and nutrient retention of soil in rare earth mine tailing areas

Purpose Soil water and nutrients are easily lost from tailings in rare earth mining areas, resulting in slow plant restoration and limited remediation effects. The present study was conducted to explore the remediation effect of superabsorbent polymers (SAPs) incorporated with organic and inorganic...
Ausführliche Beschreibung

Purpose Soil water and nutrients are easily lost from tailings in rare earth mining areas, resulting in slow plant restoration and limited remediation effects. The present study was conducted to explore the remediation effect of superabsorbent polymers (SAPs) incorporated with organic and inorganic fertilizers on the retention capacity of soil water and nutrients in rare earth mining areas. Materials and methods In this experiment, five treatments were established: the control (CK), 0.4% SAPs (S), a mixture of 8% organic fertilizer, 0.2% urea, and 1% minerals (F), and mixtures of F with 0.2% SAPs (FS1) and 0.4% SAPs (FS2). The processes of water infiltration, wetting front migration, and water leaching, the pH value and total nitrogen (TN), total phosphorus (TP), and total potassium (TK) contents in the leachate and the water content, pH value, and bulk density (BD) in the soil column were measured. Results and discussion The results showed that all amendments significantly reduced soil infiltration and the migration of the wetting front, with decrease rates of 46.39–58.76% and 31.43–54.29%, respectively. Among them, the greatest significant delay in water infiltration in the initial period was observed in the FS1 treatment. A similar effect was found in the leaching process after 50 or 80 days of incubation, after which the leachate volume was reduced by 10.11–23.61% for the FS1 treatment. The soil water content also significantly improved, and greater effects were found in the F, FS1, and FS2 treatments, where the contents increased by 0.49–29.61%. Fertilizer addition increased soluble soil nutrients, resulting in increased TN, TP, and TK contents and a decrease in the pH value of the leachate. Nutrient loss and acidification were alleviated in the FS1 and FS2 treatments due to mixing with SAPs, with reductions of 2.00–34.21% and 2.27–6.82%, respectively. In addition, adding SAPs (in the S, FS1, and FS2 treatments) alleviated soil compaction and decreased the BD. Conclusion Our findings indicated that SAPs incorporated with organic and inorganic fertilizers could increase soil fertility and enhance the soil retention capacity of soils for water and nutrients, thus providing a promising reference for the positive phytoremediation effects of this method. Ausführliche Beschreibung

Autor*in:	He, Yanzi [verfasserIn] Tian, Zhiyuan Ma, Rui Liang, Yin Zhu, Xuchao Qu, Lili

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Soil amendments Soil column experiment Water infiltration Nutrient leaching Wetting front migration

Anmerkung:

© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Übergeordnetes Werk:	Enthalten in: Journal of soils and sediments - Berlin : Springer, 2001, 23(2023), 9 vom: 06. Juni, Seite 3384-3395
Übergeordnetes Werk:	volume:23 ; year:2023 ; number:9 ; day:06 ; month:06 ; pages:3384-3395

Links:	Volltext

DOI / URN:	10.1007/s11368-023-03538-3

Katalog-ID:	SPR05279203X