水利学报2017，Vol.48Issue(8)：977-985,9.DOI:10.13243/j.cnki.slxb.20161132
不同下垫面红壤坡地壤中流对自然降雨的响应
Responses of subsurface flow characteristics to natural rainfall in red soil slopes of different surface covers
摘要
Abstract
The subsurface flow constitutes an important portion of total runoff in the sloping field of red soil.However,the occurrence mechanism and quantification of subsurface flow are the difficult issues in red soil region.To determine the subsurface flow associated with different surface cover types on sloping red soil under natural rainfall events,observational data on surface and subsurface flows from 5 m × 15 m plots were collected from 2010 to 2012 in an experiment with three treatments (grass cover,litter cover and bare land) in the Jiangxi Provincial Soil and Water Conservation Ecological Park.The results show that land cover involving grass or residue can convert more of the surface flow into subsurface flow,and relieve the impact of seasonal rainfall on the surface flow generation in red region.Under individual rainfall event,the surface flow coefficients of grass cover and litter cover are 10.80％ and 12.55％ of that of bare land,while the subsurface flows are 2.47 times and 3.22 times of bare land.The generation characteristics of subsurface flow are significantly influenced by surface covers.The average annual subsurface flow coefficient at a depth of 30 cm is 79.25 percent of that at a depth of 60 cm for bare land.In contrast,subsurface flow generated in plots with grass or litter cover at a depth of 30 cm is greater in spring,taking 34.90％ and 39.63％ of the total annual output,respectively,without significant effect on subsurface flow at a depth of 60 cm.The process of subsurface flow is mainly affected by rainfall depth and duration except for the rainfall intensity.Therefore,surface cover could effectively regulate the rainfall-runoff relationship and control rainfall erosion in red soil sloping erosion control.The findings will be of significant interest to understand the mechanism of soil erosion and its conservation of red soil slope.关键词
壤中流/下垫面/自然降雨/红壤坡地Key words
subsurface flow/surface covers/natural rainfall events/red soil slope分类
农业科技引用本文复制引用
段剑,刘窑军,汤崇军,杨洁,陈丽华..不同下垫面红壤坡地壤中流对自然降雨的响应[J].水利学报,2017,48(8):977-985,9.基金项目
国家自然科学基金项目(41361060,41501287) （41361060,41501287）
