水土保持通报2017，Vol.37Issue(6)：9-15,7.DOI:10.13961/j.cnki.stbctb.2017.06.002
西部黄土丘陵区不同草地土壤侵蚀对侵蚀性降雨的响应
Response of Soil Erosion in Different Grasslands to Erosive Rainfall in Western Loess Hilly Region
摘要
Abstract
[Objective] The responses of natural and artificial grassland to different types of erosive rainfall in loess hilly region of Western China were researched to provide guidance for vegetation construction and soil erosion control in this area.[Methods] Based on the data measured in 2007-2015 from runoff plots located in Anjiagou catchment,Dingxi City,we analyzed the influences of erosive rainfall on the erosions on 20° slopes of artificial grassland and natural grassland.[Results] In the study area,the erosive rainfall mainly occurs from May to September,and is greater in July and August,and correspondingly the amount of erosion caused by it is more than 70％ of the annual erosion.Erosions observed on the two different types of grassland were both finely correlated with PI10.The erosive rainfall mainly refers to moderate rain and heavy rain,the amount of erosion caused by the two intensity rainfalls accounts for about 86％ of the annual erosion.The erosion amounts observed in artificial and natural grassland caused by moderate & high intensity rainfalls were 90.8％ and 91.2％ of total erosion amount,respectively.The amount of soil erosion can well expressed by power function with PI10,PI30 as independent variables.Rainfall with 300 MJ · mm/(hm2 · h) or greater erosivity caused the largest proportional soil erosion,for artificial and natural grasslands,the proportion was 32.3％ and 33.4％,respectively;rainfall with erosivity of 50～100 MJ · mm/(hm2 · h) was most frequent,the erosion amount proportions were 26.0％ and 29.1％ of the total observed erosions,respectively.[Conclusion] The lower amount criteria of erosive rainfall for artificial grassland(coverage of 75％～82％) and natural grassland(coverage of more than 80％) were 11.3 mm and 11.9 mm,respectively;and the maximum I10 were 10.4 mm/h and 11.7 mm/h,respectively.The natural grassland has better effect of soil and water conservation than artificial grassland has.关键词
西部黄土丘陵区/草地/侵蚀性降雨/降雨侵蚀力/侵蚀量Key words
western loess hilly region/grassland/erosive rainfall/rainfall erosivity/erosion amount分类
农业科技引用本文复制引用
邵臻,张富,陈瑾,张佰林..西部黄土丘陵区不同草地土壤侵蚀对侵蚀性降雨的响应[J].水土保持通报,2017,37(6):9-15,7.基金项目
国家自然科学基金项目“人类活动干扰下陇中黄土高原生态系统服务功能相互关系研究”(41571051) （41571051）
