文献类型： 外文期刊

作者： Li, Fayong ¹ ; Liang, Xinqiang ¹ ; Li, Hua ³ ; Jin, Yingbin ¹ ; Jin, Junwei ¹ ; He, Miaomiao ⁴ ; Klumpp, Erwin ⁵ ; Bol, R ¹ ;

作者机构： 1.Zhejiang Univ, Coll Environm & Resources Sci, Hangzhou 310058, Peoples R China

2.Tarim Univ, Coll Water Resources & Architectural Engn, Xinjiang 843300, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, Hangzhou 310021, Peoples R China

4.Hangzhou Normal Univ, Dept Life & Environm Sci, Hangzhou 310036, Peoples R China

5.Forschungszentrum Julich GmbH, Inst Bio & Geosci, Agrosphere IBG 3, D-52425 Julich, Germany

6.Bangor Univ, Environm Ctr Wales, Deiniol Rd, Bangor LL57 2UW, Gwynedd, Wales

关键词： Soil aggregate; Colloidal phosphorus; pH; Geometric mean diameter; Loss of phosphorus

期刊名称：ENVIRONMENTAL SCIENCES EUROPE （ 影响因子：5.893； 五年影响因子：6.664 ）

ISSN： 2190-4707

年卷期： 2020 年 32 卷 1 期

页码：

收录情况： SCI

摘要： Background Colloid-facilitated phosphorus (P) transport is recognized as an important pathway for the loss of soil P in agricultural systems; however, information regarding soil aggregate-associated colloidal P (P-coll) is lacking. To elucidate the effects of aggregate size on the potential loss of P-coll in agricultural systems, soils (0-20 cm depth) from six land-use types were sampled in the Zhejiang Province in the Yangtze River Delta region, China. The aggregate size fractions (2-8 mm, 0.26-2 mm, 0.053-0.26 mm and < 0.053 mm) were separated using the wet sieving method. Colloidal P and other soil parameters in aggregates were analyzed. Results Our study demonstrated that 0.26-2 mm small macroaggregates had the highest total P (TP) content. In acidic soils, the highest P-coll content was observed in the 0.26- to 2-mm-sized aggregates, while the lowest was reported in the < 0.053 mm (silt + clay)-sized particles, the opposite of that revealed in alkaline and neutral soils. Paddy soils contained less P-coll than other land-use types. The proportion of P-coll in total dissolved P (TDP) was dominated by < 0.053 mm (silt + clay)-sized particles. Aggregate size strongly influenced the loss potential of P-coll in paddy soils, where P-coll contributed up to 83% TDP in the silt + clay-sized particles. The P-coll content was positively correlated with TP, Al, Fe, and the mean weight diameter. Aggregate-associated total carbon (TC), total nitrogen (TN), C/P, and C/N had significant negative effects on the contribution of P-coll to potential soil P loss. The P-coll content of the aggregates was controlled by the aggregate-associated TP and Al content, as well as the soil pH value. The potential loss of P-coll from aggregates was controlled by its organic matter content. Conclusion We concluded that management practices that increase soil aggregate stability or its organic carbon content will limit P-coll loss in agricultural systems.