水土保持学报2017，Vol.31Issue(3)：33-38,6.DOI:10.13870/j.cnki.stbcxb.2017.03.006
不同植被覆盖度对紫色土坡面侵蚀过程的影响
Effects of Slope Gradients on Erosion Under Different Vegetation Coverage on Purple Slopes
摘要
Abstract
The paper analyzed the erosion processes of purple soil slopes using the method of artificially simulated rainfall experiment and lab analysis to study the effects of vegetation coverage on the erosion processes of purple soil slopes,and discussed the critical point problem of slope vegetation cover.The results showed that:(1) As a whole,with the increase of vegetation coverage,the runoff on purple soil slopes decreased.The was a significant negative relationship between the vegetation coverage and the runoff.However,when the vegetation coverage was less than 25 ％,the changes in runoff were not obvious.When the vegetation coverage reached 75 ％,the stable value of the runoff was low,being obviously lower than that when the vegetation coverage was 0％,25％,and 50％.(2) Sediment yield decreased rapidly with the increase of vegetation coverage.There was a significant quadratic term correlation between the vegetation coverage and the runoff.When the vegetation coverage was below the critical value of 25 ％,the vegetation played an important role in decreasing sediment load.A vegetation coverage 50％ was the critical coverage for soil erosion control on purple soil slope.(3) Soil microaggregates (＜ 0.25mm) were the main parts in eroded sediment.Basically,all levels of soil aggregates decreased with the increase of vegetation coverage.(4) Through statistical analysis,the vegetation coverage caused an extremely significant effect on runoff and sediment yield (p ＜ 0.01).Moreover,when the vegetation coverage reached 50％,vegetation played a vital role in soil and water conservation,and reduced soil and water erosion on purple soil slopes.关键词
紫色土/植被覆盖度/产流量/产沙量/人工模拟降雨Key words
purple soil/vegetation coverage/runoff yield/sediment yield/artificially simulated rainfall分类
农业科技引用本文复制引用
戴金梅,查轩,黄少燕,陈世发,翟少华,王丽园,刘川..不同植被覆盖度对紫色土坡面侵蚀过程的影响[J].水土保持学报,2017,31(3):33-38,6.基金项目
国家科技支撑计划“福建红壤区生态修复和持续经营关键技术集成和示范”(2014BAD15B02) （2014BAD15B02）
