荒漠草原区不同土地利用方式下土壤水分相对亏缺  

Soil Water Deficit Under Different Land-use Type in Desert Steppe

作　　者：卞莹莹[1,2,3] 宋乃平[2,3] 王兴[2,3] 肖旭培 

机构地区：[1]宁夏大学农学院,银川750021 [2]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川750021 [3]西部生态与生物资源开发联合研究中心,银川750021

出　　处：《水土保持学报》2015年第1期201-206,213,共7页Journal of Soil and Water Conservation

基　　金：国家重点基础研究发展计划"973"项目(2012CB723206);国家科技支撑计划项目(2011BAC07B03)

摘　　要：以典型荒漠草原区(宁夏盐池县柳杨堡乡杨寨子村)作为研究对象,采用土壤水分相对亏缺指数(CSWDI)、样地土壤水分相对亏缺指数(PCSWDI)、土壤有效储水量(ESWS)、土壤水分相对亏缺量(DSWS)、变异系数(CV)5个指标来衡量旱地、天然草地、柠条林地3种土地利用方式下土壤水分的亏缺程度。研究结果表明:(1)旱地、天然草地、柠条林地的土壤储水量和土壤有效储水量与降雨量的变化趋势相同。且降雨对剖面土壤水分的影响程度随土层深度的增加而减弱。(2)土壤水分亏缺状况表现为旱地>柠条林地>天然草地。天然草地土壤水分不亏缺,旱地、柠条林地土壤水分呈亏缺状态。(3)天然草地土壤水分蓄积效应最强,土壤水分亏缺主要集中在表层。旱地土层越深土壤水分越亏缺土壤水分亏缺。柠条林地0-100cm土层土壤水分不亏缺,100-200cm土层土壤水分亏缺。(4)旱地、天然草地、柠条林地土壤水分剖面变化分别呈现波动型、增长型和稳定型。Soil water,the effective water source for plant growth,has become a key limiting factor in vegetation restoration and ecological reconstruction in China＇s desert steppe,because of the semi-arid climate and water scarcity.However,without an appropriate scientific guidance,revegetation and cultivation may result in excessive water consumption and soil water deficit in different soil layers,which in turn restrict significantly the local ecological restoration and environmental enhancement.Based on local rainfall and soil water condition,quantitative evaluation of soil water deficit and its profile distribution is the premise and foundation for proper vegetation restoration and sustainable ecological development in desert steppe,and there is one of the top research priorities at present with both theatrical and practical significance.In this study,we selected a typical desert steppe area located in the Yangzhaizi village,Yanchi county,Ningxia province of China,to qutantify the response of soil water deficit under different land-use type.Soil water under natural grassland,drylands and Caragana korshinskii forest were analyzed on field sampling and laboratory test.For comparision,the background soil water content was set to the value of natural grassland which was banned grazing for a long period.Then,compared soil water deficit index（CSWDI）,plot compared soil water deficit index（PCSWDI）,effective soil water storage（ESWS）,deficient soil water storage（DSWS）,coefficient of variation were calculated and analyzed to quantify soil water deficit degree and its profile distribution under different land-use type.The results showed：（1）Compared with natural grassland,the soil water under different land-use type in desert steppe was deficited.From June to October,the variation tendency of soil water storage and effective soil water storage under different land-use type were the same.And the rainfall was vailsupply to soil water.（2）When the soil layer water storage of drylands from 0to 200 cm was defici

关 键 词：荒漠草原区 土地利用方式 土壤水分亏缺 

分 类 号：S152.7[农业科学—土壤学]