摘要
在粤北山区裸地、草坡地和耕地等3种石漠化土地的坡面上,采用0.3mm.min-1、0.48mm.min-1、0.72mm.min-1、1.08mm.min-14种降雨强度进行了36场人工降雨模拟试验。结果表明,坡面上3种类型石漠化土地的土壤侵蚀特征、强度各不相同。在同一地类上,土壤侵蚀量随降雨过程的进行呈现出波动下降的趋势,且随雨强的增大,土壤侵蚀量亦增大;土壤侵蚀量与雨强之间均呈现极显著的线性相关关系。在任一雨强条件下,都是裸地的土壤侵蚀量最大,耕地次之,草坡地最小。地表覆被对降雨侵蚀产沙过程有重要的抑制作用,大雨强条件下抑制作用尤为突出;而水平沟耕作方式能减少小雨强条件下的土壤侵蚀量,但随着雨强的增大,其影响也随之降低。
Simulated rain is a valid tool to examine soil erosion on sloping land.36 simulated rainfall experiments with different rainfall intensities and durations are completed on three different types of land in typical rocky desertification land slope in northern Guangdong Province.Results show that soil erosion amount decreased in fluctuation under same land surface condition during rain process;under typical rainfall intensity,the sediment yield from bare land is more than from grassland and cultivated land.Vegetation cover has important impact on sediment yield,especially under heavy rainfall intensity.Contour ditch farming can reduce sediment yield under small rainfall intensity,but the effect reduces with rising of rainfall intensity.
出处
《中国沙漠》
CSCD
北大核心
2011年第6期1488-1492,共5页
Journal of Desert Research
基金
国家自然科学基金项目(30870469)资助
关键词
土壤侵蚀
人工降雨
坡地
石漠化
粤北山区
soil erosion
artificial rain
experimental study
rocky desertification
northern Guangdong province
