水土保持学报2018，Vol.32Issue(2)：80-86,7.DOI:10.13870/j.cnki.stbcxb.2018.02.012
次降雨事件下雨养区典型小流域土壤水分运移规律
Soil Moisture Migration Characteristics of Typical Small Watershed in Rain Feed Region Under Individual Rainfall Events
摘要
Abstract
The research area of this study was the Wangmao small watershed in Suide county of the Loess Plateau of China.Combining with the field investigation and laboratory test,the variations of stable isotopes (δ2H) in the vadose zone under three different land use types were studied in a single rainfall event.The results showed that:(1) The soil water content ranged from 6.74％ to 21.42％ in grassland,from 6.74％ to 19.08％ in woodland,and from 7.86％ to 20.74％ in farmland.The variation ranges of soil water storage were from 265.6 mm to 384.0 mm in grassland,from 275.1 mm to 368.7 mm in woodland,and from 289.5 mm to 334.6 mm in farmland.The variation ranges of δ2H in soil water were from-113.41‰ to-71.84‰ in grassland,from-115.10‰ to-50.98‰ in woodland,and from-112.28‰ to-63.78‰ in farmland.(2) There were two trends in soil water content changes in grassland,woodland and farmland,but with difference in time nodes.(3) There were significant differences in the hydrogen isotopic changes of soil water in different land use types.The farmland and grassland were favorable for the soil water retention,but it was not easy for the woodland to maintain soil moisture.(4) The peak values of soil water storage under different land use types were inversely related to the water storage capacity.The higher the peak value,the lower the corresponding water storage capacity.(5) There were preferential flow phenomena in all land uses studied,with the largest preferential flow in woodland.The path of preferential flow was extended in grassland and woodland,whereas in farmland,it might be affected by the quality and recharge of groundwater.关键词
降水/土壤水/氢同位素/水分运移/黄土丘陵沟壑区Key words
precipitation/soil water/hydrogen isotope/water movement/Loess Plateau分类
农业科技引用本文复制引用
马田田,白璐璐,柯浩成,李占斌,李鹏,肖列,张洋,汤珊珊,郑淋峰,苏远逸..次降雨事件下雨养区典型小流域土壤水分运移规律[J].水土保持学报,2018,32(2):80-86,7.基金项目
国家重点研发计划项目(2016YFC0402404,2017YFC0504704) （2016YFC0402404,2017YFC0504704）
国家自然科学基金重点项目(41330858) （41330858）
