陕北黄土区阳坡微地形土壤水分特征研究  

Soil Moisture Characteristics of Micro-topography in South Slope of Loess Region in Northern Shaanxi Province

作　　者：王晶[1] 朱清科[1] 赵荟[1,2] 云雷[1] 刘中奇[1,3] 邝高明[1] 谢静[1] 

机构地区：[1]北京林业大学水土保持与荒漠化防治教育部重点实验室,北京100083 [2]国家林业局昆明勘察设计院,云南昆明650216 [3]内蒙古民族大学,内蒙古通辽028000

出　　处：《水土保持通报》2011年第4期16-21,共6页Bulletin of Soil and Water Conservation

基　　金："十一五"国家科技支撑项目"困难立地工程造林关键技术研究"(2006BAD03A03)

摘　　要：采用定点动态监测的方法对陕西省吴起县合沟流域内的阳坡微地形土壤含水量进行了对比研究。结果表明:(1)微地形土壤水分的季节变化滞后于降雨的季节变化,其对土壤含水量的影响旱季大于雨季;(2)在0—180 cm土层中,随着土层深度的增加,微地形土壤含水量呈增加的趋势,变异系数减小;(3)微地形不同土层的土壤含水量具有差异,在0—20 cm土层,所有微地形土壤含水量均大于对照坡面,土壤含水量呈现:缓台>塌陷>切沟>陡坎>浅沟;20—80 cm土层土壤含水量则表现为:切沟>缓台>塌陷>陡坎>浅沟>坡面;80—180 cm土层中,土壤含水量最大的是缓台,坡面、浅沟、切沟土壤含水量相差不多,陡坎土壤含水量比坡面略小,塌陷土壤含水量最小。The micro-topography soil moisture content of south slope in He valley of Wuqi County,Shaanxi Province was researched by the method of dynamic fixed-point monitor.The results showed that：（1） The seasonal variation of micro-topography soil moisture lagged behind the rainfall seasonal variation,its influence on soil moisture content of dry season was more obvious than that of rainy season.（2） In the 0—180 cm soil layer,the micro-topography soil moisture content tended to increase and the coefficient of variation reduced with the increase of soil depth.（3） There existed differences between micro-topography soil moisture content for different soil layers.In soil layer of 0—20 cm,all the micro-topography soil moisture was bigger than the comparison slope and the order was platform,collapse,dissected valley,steep slope,shallow gully;the order of soil moisture in 20—80 cm soil layer was dissected valley,platform,collapse,steep slope,shallow gully,comparison slope;in 80—180 cm soil layer,the micro-topography with the biggest soil moisture content was platform,comparison slope,shallow gully and dissected valley were almost the same,steep slope was a little bit smaller than comparison slope,collapse was the smallest.

关 键 词：微地形 土壤水分 季节变化 垂直变化 

分 类 号：S152.7[农业科学—土壤学]