荒漠草原坡面环境土壤水分特征  

Study on Soil Water Characteristic in Desert Steppe Slope

作　　者：蒙仲举[1] 任晓萌 高永[1] 赵春光 

机构地区：[1]内蒙古农业大学,内蒙古呼和浩特010019 [2]内蒙古气象科学研究所,内蒙古呼和浩特010051 [3]鄂尔多斯市工业与城市供水办公室,内蒙古东胜017000

出　　处：《节水灌溉》2014年第1期20-23,共4页Water Saving Irrigation

基　　金：内蒙古自然科学基金项目(2013MS0613)"基于数字图像处理技术的荒漠草原地表风蚀特征研究"

摘　　要：水分作为生态系统中最活跃的因素,在草原退化与其逆转过程中起着决定性作用。采用TSCⅠ型管式土壤水分仪对水利部水土保持生态监测中心微地形及其天然坡面的土壤含水量进行了长期定位监测,同时结合Ku^pF土壤水分特征曲线测定仪对坡面不同部位原状土的土壤水分特征曲线进行了测定。结果表明,荒漠草原土壤水分垂直分层主要包括为速变层、活跃层和次活跃层3种类型。土壤水分特征曲线可以较好地拟合为方程y=a ex+b。不同坡位之间,比水容量大小顺序为低洼地>坡底>坡中>坡顶,低洼地、坡底土壤的供水、持水性能优于坡顶。Water is the most active factor in ecosystem and plays a decisive role on grassland degradation. In this paper, the water content and soil water characteristic curve was measured by TSC I -tube soil moisture instrument and soil moisture characteristic curve analyzer at Water Conservation Monitoring Centre of Ministry of Water Resources. The results showed that the vertical strati- fication of soil moisture in desert steppe mainly included quickly changing layer, active layer and the second active layer. The soil moisture characteristic curve could be well fitted by the equation y=ae^x＋b. The order of specific water capacity from large to small was low land, base, middle slope, top. The water-holding capacity of low land and base were superior to that of slope top.

关 键 词：荒漠草原 水分特征曲线 比水容量 

分 类 号：S152.7[农业科学—土壤学]