CONTROLLABILITY OF PHOSPHORUS LOSSES IN SURFACE RUNOFF FROM SLOPING FARMLAND TREATED BY AGRICULTURAL PRACTICES

文献类型： 外文期刊

第一作者： Chen, Shanghong

作者： Chen, Shanghong;Dong, Yuequn;Yang, Xiaojuan;Yang, Zhengli;Chen, Shanghong;Liu, Dinghui

作者机构：

关键词： soluble phosphorus; sloping cropland; surface runoff; contour culturing; organic matter addition

期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）

ISSN： 1085-3278

年卷期： 2017 年 28 卷 5 期

页码：

收录情况： SCI

摘要： Phosphorus (P) loss from arable sloping land due to water erosion causes off-site environment pollution in the Three Gorges area in China. This study aims to estimate the effects of agricultural practices on the reduction of P losses during water erosion processes under natural precipitation conditions: contour culturing with organic matter addition (CT + OM), contour culturing with wheat straw mulching (CT + SM), contour culturing with straw mulching and organic matter addition (CT + OM + SM) and conventional downslope culturing framework as a control (CK). Results demonstrated that CT + OM + SM could viably diminish runoff, sediment yields and P losses from arable sloping land. Compared with CK, CT + OM, CT + SM and CT + OM + SM lessened the surface runoff depths by 19%, 34% and 50%, respectively. A high curve number value induced a notable runoff potential from the plot. The surface-runoff-related total P (TP) loads for CK with yearly measures of 1.56 kg ha(-1) were significantly higher than those for CT + OM, CT + SM and CT + OM + SM at 1.07, 0.77 and 0.51 kg ha(-1) (p < 0.05), respectively. With all things considered, the particulate P losses represented a significant division of TP losses, adding up to almost 80% in 2014 and 79% in 2015. The outcomes demonstrated that surface protection and organic matter addition are two of the greatest agricultural protection practices that lessen P losses in the surface runoff from sloping farmland by water erosion. Copyright (C) 2017 John Wiley & Sons, Ltd.

分类号： S15

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