中国岩溶2016，Vol.35Issue(6)：629-638,10.DOI:10.11932/karst20160604
典型岩溶山坡土壤剖面水分对降雨响应过程研究
The response processes of moisture at soil profile to precipitation in typical karst hillslopes
摘要
Abstract
To reveal the response processes of the moisture at soil profile to precipitation events,high-resolution monitoring has been conducted to estimate the dynamic change and the factors that affect the soil profile moisture.The purpose of this study was to identify the rainfall infiltration mechanisms in karst hillslope areas.The results indicate that the response of soil profile moisture to precipitation is influenced by previous soil moisture,rainfall amount,rainfall intensity and topographic condition.The resident time of the first soil moisture response is related to previous soil moisture content,which ranges from 0.5-4.75 h,characterized by significant seasonal differences.A threshold rainfall amount exists for producing an increase of soil moisture.The 6 mm threshold is required to activate soil moisture response in dry seasons.The response time is almost synchronous,approximately 0.25 h,when the soil moisture deficit is overcome.These results illustrate that the deeper soil moisture is probably recharged by preferential flow or lateral flow.The magnitude of soil moisture variation decreases with the increase of soil depth,which is related to the climate condition,evaporation and medium permeability differences controlled by communicating with the interfaces of soil-atmosphere,soil-vegetation,and soil-bedrock.关键词
土壤剖面水分/降雨响应/阈值/响应时间/前期土壤含水量Key words
soil profile moisture/precipitation response/threshold/response time/prior soil moisture分类
天文与地球科学引用本文复制引用
郭小娇,龚晓萍,汤庆佳,陈长杰,姜光辉,李鑫,邹艳娥..典型岩溶山坡土壤剖面水分对降雨响应过程研究[J].中国岩溶,2016,35(6):629-638,10.基金项目
国家自然科学基金(41172231、441501222) （41172231、441501222）
中国地质调查项目(DD20160305) （DD20160305）
中国地质科学院岩溶地质研究所基本科研业务费项目(2015007) （2015007）
