水土保持学报2018，Vol.32Issue(1)：74-79,6.DOI:10.13870/j.cnki.stbcxb.2018.01.012
水蚀过程中裸露陡坡耕地土壤侵蚀特征
Soil and Water Loss on the Tilled Bare Land with Steep Slope in Rainfall-Erosion Processes
摘要
Abstract
Tillage practices,which change the soil surface structure,lead to different soil erosion characteristics on the tilled surfaces compared to the smooth surface.The objective of this study was to analyze soil and water loss on the tilled surfaces in rainfall-erosion processes based on the simulated rainfall experiments.Experiment results would be used for evaluating the soil and water conservation benefit of the projects of return steep slope land to forestry.Tillage practices in this study included shallow hoeing (SH),deep hoeing (DH) and contour ploughing (CP).A smooth surface (SS) was served as control measure.Rainfall intensities were 60,90 and 120 mm/h and rainfall duration was 80 min for three rainfall intensities.Results showed that:(1) On the tilled steep slope,three tillage practices delayed the beginning of surface runoff during the rainfall of 60 and 90 mm/h intensities,but no significant difference was found in surface runoff initiation time between SH and SS,and between DH and SS during the rainfall of 120 mm/h intensity;(2) The cumulative production flow of CP was lower than the SS under three rainfall intensities,but no obvious regularity in size of the cumulative production flow for SH and DH treatments compared with SS;(3) In rainfall of 120 mm/h intensity,the flow sediment concentration of slope with tillage practices was higher than SS,leading soil sediment from three tilled slopes was 2 ～ 5 times of SS.Therefore,on the tilled and bare steep slope,when the rainfall intensity is larger,the tillage practices not only fail to reduce soil erosion,instead will increase.关键词
地表糙度/耕作措施/坡耕地/土壤侵蚀Key words
soil surface roughness/tillage practices/sloping land/soil erosion分类
农业科技引用本文复制引用
赵龙山,侯瑞,吴发启,戴全厚..水蚀过程中裸露陡坡耕地土壤侵蚀特征[J].水土保持学报,2018,32(1):74-79,6.基金项目
国家自然科学基金项目(41601293) （41601293）
贵州省科技计划项目(黔科合基础[2016]1027,黔科合[2016]支撑2835号) （黔科合基础[2016]1027,黔科合[2016]支撑2835号）
贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]114) （黔教合KY字[2016]114）
贵州省国内一流学科建设项目(GNYL[2017]007) （GNYL[2017]007）
