摘要
以宁夏中部干旱带盐池县封育沙地为例,利用GPS定位,采用定位监测的方法,以自然状态下的流动沙地为对照,对不同封育年限的封育沙地的土壤水分时空特征进行分析.结果表明,不同类型封育沙地的土壤水分含量随着土层深度而变化,一般为表层土壤含水量均较低,随着土壤深度的增加,土壤含水量先增大后降低.土壤水分变异系数随着土层深度的增加均呈现出降低的趋势,土壤水分含量由大到小依次为流动沙地,封育2 a沙地,封育4 a沙地,人工恢复沙地.同时,根据生长季初末土壤含水量的变化特征,土壤水分的年内变化规律表现为流动沙地和封育2 a沙地的土壤水分为积累型,封育4 a沙地的土壤水分近似于平衡型,而人工恢复沙地的土壤水分则是消耗型.这主要是降水入渗补给和蒸腾蒸发两个相反过程相互制约的结果.
Taking fencing sandy land of the central area zone in Yanchi County of Ningxia as an example,tspatio-temporal characteristic of soil moisture in different fencing time were studied using GPS positioning and located monitoring method.The results show that soil moisture of different type fencing sandy land had parabola curve with soil depth increasing.Variation coefficient of soil moisture decreased with soil depth increasing,and the soil moisture arranged in decending order,moving sandy land〉fencing 2 years〉fencing 4 years〉artificial restoration sand.According variation characteristics of soil moisture in growing season,the variation of soil moisture in the year showed that soil moisture of moving sandy land and fencing 2 years were accumulation-mode,fencing 4 years were balanced type and and artifical restoration sand were consumption mode.It was the result of mutual restriction of opposite process for rainfall infiltration recharge,evaporation and transpiration.
出处
《宁夏大学学报（自然科学版）》
CAS
北大核心
2010年第2期173-176,186,共5页
Journal of Ningxia University(Natural Science Edition)
基金
国家重大基础研究前期研究专项(2009CB42604)
宁夏自然科学基金资助项目(NZ0830)
关键词
盐池县
封育区沙地
土壤水分
时空特征
Yanchi County
fenced sandy land
soil moisture
spatio-temporal characteristic
