水土保持学报2017，Vol.31Issue(3)：231-238,8.DOI:10.13870/j.cnki.stbcxb.2017.03.039
黄土丘陵区林地干化土壤降雨入渗及水分迁移规律
Regularities of Rainfall Infiltration and Water Migration in Woodland Drying Soil in the Loess Hilly Region
摘要
Abstract
Based on the fact of the formation of large-scale soil dry layers in recent years,a field soil column up to 10 m was established to simulate the drying soil in jujube forests at the Mizhi experimental station,which is located in the north of Shaanxi Province.The purpose was to explore the regularities of rainfall infiltration and water migration,also to clarify the infiltration capability of dry loess.By using the CS650-CR1000 automatic system,changes of soil moisture within different depths were observed continuously under natural conditions.Meanwhile,the precipitation during the monitoring period was recorded by an automatic weather station.The results showed that both of the depths of infiltration and migration under independent rainfall mainly depended on the precipitation.The depths could reach up to 90-140 cm,70-80 cm,and 40 cm,respectively,when influenced by heavy rain,middle rain,and light rain.With the same precipitation,it was affected by other factors such as rainfall intensity and initial soil water content.The greater the rainfall intensity and the higher the initial soil water content was,the deeper the depths were.Under intermittent rainfall conditions,several rainfall events promoted infiltration and migration interactively.Compared with independent rainfall,the intermittent rainfall could significantly increase the infiltration depth by 100％-160％,and the migration depth by 91％-197％ with the same precipitation.In the loess region,not all the rainfall events could influence the soil.During the observation periods,the effectiveness of the rainfall frequency and amount were 36.3％,72.7％ respectively.Under the influence of multiple rainfall events,the soil profile tended to be layered.According to the changes of soil moisture,the affected soil could be mainly divided into three levels,i.e.the sensitive layer of rainfall infiltration within 90 cm,the delayed layer of rainfall infiltration between 90 cm and 160 cm,and the migrating layer of rainfall between 160 cm and 240 cm.The results are of great theoretical and practical significance to the restoration of woodland drying soil and scientific management of soil moisture in the loess hilly region.关键词
降雨/入渗/迁移/湿润锋/土壤水分Key words
rainfall/infiltration/migration/wetting front/soil moisture分类
农业科技引用本文复制引用
张敬晓,汪星,汪有科,靳姗姗,董建国,汪治同..黄土丘陵区林地干化土壤降雨入渗及水分迁移规律[J].水土保持学报,2017,31(3):231-238,8.基金项目
陕西省科技统筹项目“红枣优质高效生产关键技术集成与示范”(2014KTCG01-03) （2014KTCG01-03）
国家科技支撑计划项目“陕北水蚀区植被功能调控技术与示范”(2015BAC01B03) （2015BAC01B03）
陕西省科技统筹项目“陕北风沙区设施枣树节水提质增效技术研究”(2016KTZDNY-01-05) （2016KTZDNY-01-05）
