土壤水分变异对降雨和植被的响应

Responses of soil moisture variations to rainfall and vegetation

在我国半干旱地区水土流失严重的黄土高原,开展土壤水分的时空变异研究有着极其重要的生态意义,是土地可持续利用的基础。该文利用时间序列分析方法,研究了黄土高原丘壑区降雨、植被对土壤水分特征变化的影响。结果表明,红豆草和豌豆的表层土壤含水量对降雨响应速度快于油松土壤含水量;水分入渗增湿与同期降雨量密切相关;土壤含水量对降雨的响应时间随土层深度的增加而变长。

Soil moisture is a basic survival factor for plants.Soil erosion is serious in the Loess Plateau of China.The research on the temporal and spatial variation of soil moisture has an important ecological significance and it is also the basis of sustainable land use.The method of time-series analysis was used to study the effects of rainfall and vegetation on soil moisture characteristics in the hilly areas on the Loess Plateau.The results indicated that the response rates of soil moisture content for Onobrychis viciaefolia and Pisum sativum in surface layer were more quickly than that for Pinus tabulaeformis.The infiltrating moisture was closely related to the rainfall amount.The response time of soil moisture content increased with the increase of soil depth.