Combined effects of runoff and soil erodibility on available nitrogen losses from sloping farmland affected by agricultural practices
Combined effects of runoff and soil erodibility on available nitrogen losses from sloping farmland affected by agricultural practices
复制标题
径流和土壤侵蚀性对受农业实践影响的坡耕地有效氮损失的综合影响
DOI：
10.1016/j.agwat.2016.05.018
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发表时间：
2016-10-01
影响因子：
6.7
通讯作者：
Huang, Xinjun
中科院分区：
文献类型：
--
作者：
Zhang, Qingwen;Liu, Dinghui;Huang, Xinjun
紫色土的敏感性和集约耕作使坡耕地在强降水条件下易发生侵蚀。本研究旨在提高对地表保护性耕作和添加有机物减少养分流失的潜在效益的评估。采用田间小区试验，在自然降雨条件下，研究了传统顺坡耕作（CK）、等高耕作+有机质（CT+ OM）、等高耕作+秸秆覆盖（CT+SM）和等高耕作+秸秆覆盖+有机质（Cf + OM + SM）4种耕作措施对水稻产量的影响。径流深度，养分负荷和土壤可蚀性被用来评估秸秆覆盖和有机质添加的影响。结果表明：试验期内，CK处理的径流深最大，平均为16.91mm，径流系数平均为32%;与CK相比，CT+ OM、CT + SM和CT+ OM + SM处理的径流深分别减少了19%、34%和50%。土壤可蚀性指标在4种处理间差异显著（p
The susceptibility of purple soil and intensive tillage render the land prone to erosion under heavy precipitations in a sloping cropland in southwestern China. This study aimed to improve the evaluation of the potential benefits of surface protection tillage and organic matter addition to decreasing nutrient losses. A field plot experiment under natural rainfall conditions was conducted, which employed four management practices: conventional downslope tillage system as control (CK), contour tillage (CT) with organic matter addition (CT+ OM), CT with wheat straw mulching (CT+SM), and CT combining straw mulching and organic matter addition (Cf + OM + SM). Runoff depth, nutrient loads, and soil erodibility were used to estimate the effects of straw mulching and organic matter addition. Results indicated that the runoff depth under CK was largest during the experimental period, with an average of 16.91 mm, and runoff coefficient average was 32%. Compared with CK, the runoff depth under CT+ OM, CT + SM, and CT+ OM + SM were reduced by 19%, 34%, and 50%, respectively. A significant difference in soil erodibility indicator among the four treatments was indicated (p