摘要
基于人工降雨试验,研究不同残茬覆盖度在4°坡对黑土坡面水土保持效益的影响。试验设置3个平行条件,分别为4个雨强(30,60,90,120 mm/h),5个残茬覆盖度(15%,35%,55%,75%以及裸土对照组)以及2种土壤初始含水量(8%和30%,分别对应干、湿运行)。结果表明:对黑土坡面进行残茬覆盖处理,能够起到抑制土壤产流产沙的作用,且覆盖度越高,其抑制作用越明显。15%,35%,55%,75%覆盖度下保水效益可以分别可以达到30%,27%,57%,72%;保土效益分别可以达到36%,53%,89%,94%。根据保水保土效益与覆盖度的关系建立了指数函数关系式。与保水效益相比,残茬覆盖处理的保土效益更为明显。残茬覆盖不仅能提高黑土养分,更是保护黑土的有效方式。
Rainfall simulation experiments were conducted to study the effects of different residue coverage on soil and water conservation of the black soil on 4°slope.Three parallel conditions were set up in the experiment,which were five residue coverage(bare,15%,35%,55%and 75%),four rainfall intensities(30,60,90 and 120 mm/h),two initial soil moistures(8%and 30%,corresponding to dry and wet operation).The results showed that residue cover had positive effects on reducing the soil erosion and the runoff and sediment production of the black soil,and the higher the coverage,the more obvious the inhibition.The water conservation benefits under the 15%,35%,55%and 75%residue coverage could reach 30%,27%,57%and 72%,respectively.The soil conservation effects under the four residue coverages could reach 36%,53%,89%and 94%,respectively.Exponential functions were established between the soil and water conservation benefits and the residue coverage.Compared with the water conservation benefit,the soil conservation benefit of residual cover was more obvious.Residue cover could not only increase the nutrient contents,but also an effective way for the black soil protection.
作者
杨静怡
谢云
辛艳
YANG Jingyi;XIE Yun;XIN Yan(Faculty of Geographical Science,Beijing Normal University,Beijing 100875;State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875)
出处
《水土保持学报》
CSCD
北大核心
2020年第5期81-85,93,共6页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2018YFC0507000,2017YFE0118100)。
关键词
人工降雨
黑土
残茬覆盖
水土保持效益
artificial rainfall
black soil
residue coverage
soil and water conservation benefits
