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Variability of phosphorus sorption properties in hydromorphic soils: Consequences for P losses in agricultural landscapes
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2022-11-24 , DOI: 10.1111/ejss.13326
Ewan Couic, Gérard Gruau, Sen Gu, Antoine Casquin

Increasing concerns over water eutrophication due to agricultural phosphorus (P) loss have led to the development of indicators to assess the risk of P release from agricultural soils. Recently, a logarithmic equation linking the degree of phosphorus saturation (DPS) to the simple water-soluble P (WSP) content of soils has been proposed as a universal method to assess this risk based, however, mainly on the analysis of well-drained soils. Here, we studied the P sorption properties and DPS values of 69 hydromorphic soils from cultivated and uncultivated wetland zones located in Brittany, Western France, to test whether the method could also apply to poorly-drained soils. The bulk soil analysis showed that P contents of the studied hydromorphic soils were 30% to 80% higher than P contents normally found in Brittany soils, evidencing a possible P enrichment process. Adsorption isotherms revealed a surprisingly high variability in the P sorption properties as a function of the location of the soil (maximum P adsorption capacity ranging from 500 to 1850 mg kg−1), which is caused by variations in the phases controlling P sorption in soil (from clay to organic matter and/or iron and aluminium oxides, depending on the soil location). Distinct relationships between DPS and WSP values were also obtained depending on the location of the soils. The obtained DPS versus WSP relationships showed that the P saturation threshold above which the risk of dissolved P release increases markedly is 30% lower on average for hydromorphic soils than for well-drained soils. Hydromorphic soils appear to be more at risk of releasing dissolved P at the same DPS values than well-drained soils. The present study indicates an underestimation of the P release risk from hydromorphic soils by the existing method developed for well-drained soils and calls for the development of specific risk assessment tools for hydromorphic soils, especially given on the strong spatial heterogeneity of their P sorption properties.

中文翻译:

水形态土壤中磷吸附特性的变化:农业景观中磷损失的后果

对农业磷 (P) 损失导致水体富营养化的担忧日益增加,导致制定指标来评估农业土壤中磷释放的风险。最近,已提出将磷饱和度 (DPS) 与土壤的简单水溶性磷 (WSP) 含量联系起来的对数方程作为评估这种风险的通用方法,但主要基于排水良好的分析土壤。在这里,我们研究了位于法国西部布列塔尼的耕地和未开垦湿地的 69 种水形态土壤的磷吸附特性和 DPS 值,以测试该方法是否也适用于排水不良的土壤。大块土壤分析表明,所研究的水形态土壤的磷含量比布列塔尼土壤中通常发现的磷含量高 30% 至 80%,证明可能的 P 富集过程。吸附等温线表明,作为土壤位置的函数,P 吸附特性具有惊人的高可变性(最大 P 吸附容量范围为 500 至 1850 mg kg−1),这是由控制土壤中磷吸附的相变化引起的(从粘土到有机物和/或铁和铝的氧化物,取决于土壤位置)。根据土壤的位置,还获得了 DPS 和 WSP 值之间的不同关系。获得的 DPS 与 WSP 关系表明,对于水形态土壤,溶解磷释放风险显着增加的磷饱和阈值平均比排水良好的土壤低 30%。与排水良好的土壤相比,在相同的 DPS 值下,水形态土壤似乎更容易释放溶解的磷。本研究表明,通过为排水良好的土壤开发的现有方法低估了水形态土壤的磷释放风险,并呼吁为水形态土壤开发特定的风险评估工具,
更新日期:2022-11-24
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