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黑土区宽垄和窄垄耕作的顺坡坡面土壤侵蚀对比
Authors
刘刚
师宏强
+4 more
张勋昌
王磊
覃超
郑粉莉
Publication date
1 January 2019
Publisher
Abstract
宽垄耕作具有明显的增产效应,但顺坡宽垄耕作的坡面土壤侵蚀研究鲜见报道。该文基于野外大型坡面 径流场观测和室内模拟降雨试验,对比分析了中国黑土区顺坡宽垄和窄垄耕作的坡面土壤侵蚀差异。结果表 明,野外观测和室内模拟条件下顺坡宽垄坡面侵蚀量较之于顺坡窄垄坡面分别减少 64.4%~90.4% 和 33.2%~ 57.9%,同时2种垄作方式下坡面侵蚀量与径流量均呈现出良好的线性关系(R2≥0.81),但顺坡宽垄处理下的坡面 侵蚀量随径流量的增加幅度小于顺坡窄垄处理。野外观测结果还表明, 2种垄作方式的坡面侵蚀量皆与降雨侵 蚀力PI30和径流量呈显著正相关关系,顺坡宽垄较之于顺坡窄垄减少的坡面侵蚀量随着 PI30的增大而呈降低趋 势,当PI30为430~605时,顺坡宽垄较顺坡窄垄的坡面土壤侵蚀量减少 74.8%~90.4%,当PI30为1520~1708时, 顺坡宽垄较顺坡窄垄的坡面土壤侵蚀量减少 64.4%和66.5%。无论是野外观测还是室内模拟试验均表明,与传 统的顺坡窄垄相比,顺坡宽垄具有较好防治坡面土壤侵蚀效果。因此,在东北黑土区推广宽垄耕作对保护黑土 资源有重要意义。</div
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 24/05/2021