干表层的概念界定及其水文生态效应研究  

Concept definition of dry surface layer and its hydro-ecological effects

作　　者：杨泽元[1,2,3] 许登科[1,2,3] 郑志伟[1,2,3] 石玉红[1,2,3] 史晓琼 张艳娜[1,2,3] 李文莉 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]旱区地下水文与生态效应教育部重点实验室,陕西西安710054 [3]陕西省地下水与生态环境工程研究中心,陕西西安710054 [4]核工业二〇三研究所,陕西咸阳712000 [5]陕西省地质环境监测总站,陕西西安710068

出　　处：《水文地质工程地质》2017年第2期77-81,95,共6页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目资助(41272247;41230314;41272246);教育部留学回国人员科研启动基金项目资助(2013C0290418);中央高校基本科研业务费资助项目资助(2013G1502031;2014G2290018)

摘　　要：干表层(DSL,Dry Surface Layer)是干旱半干旱地区土-气界面的重要组成部分,影响着陆地水分循环。文章以土壤物理学、土壤水动力学、土壤热力学和水文地质学的基本理论为指导,在综合分析前人资料的基础上,结合室内物理试验的部分观测成果,界定了干表层的概念,探讨了此概念的内涵与外延;辨析了干表层和(下伏)土壤干层两个概念的关系;阐明了干表层与地下水位埋深的关系,干表层对降雨入渗、蒸发和植被的影响。Dry Surface Layer（ DSL）,which affects water circulation of lands,is one important part of the land-atmosphere interface in arid and semiarid regions. Directed by basic theories of soil physics,dynamics of soil moisture, soil thermodynamics and hydrogeology, based on synthetic analysis of document data of forefathers,combining parts of observation data of a physical test indoors,the concept of DSL was firstly defined,then its connotation and extension were discussed. Secondly,the relationship between DSL and Soil Dry Layer Underlining（ SDLU） was compared. Thirdly,the relationship between DSL and depth of water table,and influence of DSL on precipitation infiltration,evaporation and vegetation was clarified. All these can enrich theories of DSL formation and earth＇s critical zone,and provide scientific evidence for sustainable utilization of water resources and eco-environment protection in arid and semiarid regions.

关 键 词：土-气界面 干表层 概念界定 水文生态效应 干旱半干旱地区 

分 类 号：P641.131[天文地球—地质矿产勘探] S152.73[天文地球—地质学]