ZHANG Jian-bing,XIONG Hei-gang,GUO Yu-xiang,et al.Study on Spatial Variability of Surface Soil Moisture in Different Positions of Sand Dunes in South Gurbantonggut Desert[J].Research of Soil and Water Conservation,2010,17(02):125-129,135.
古尔班通古特沙漠南缘春季沙丘不同部位表层土壤水分空间变异性研究
- Title:
- Study on Spatial Variability of Surface Soil Moisture in Different Positions of Sand Dunes in South Gurbantonggut Desert
- 分类号:
- S152.7
- 摘要:
- 研究春季沙丘土壤水分含量及其变异特性对沙丘植被建设、防风固沙工程具有重要意义。对4月初古尔班通古特沙漠南缘半固定沙丘迎风坡、背风坡及丘间低地表层土壤水分研究发现，丘间低地土壤含水量（14.86%）远高于迎风坡（7.65%）及背风坡（7.38%）；表层土壤水分的变异强弱与土壤含水量高低呈正相关，具体为丘间低地>迎风坡>背风坡，其变异系数分别为0.23，0.15，0.14。迎风坡、背风坡及丘间低地表层土壤水分空间自相关程度高，前两者能很好地拟合为球状模型，后者为指数模型，3者变程差距大，分别为24.32 m，8.79 m，91.00 m。沙丘各部位表层土壤含水量等值线图一方面显示了坡面中部及下部土壤水分总体上高于上部，另一方面也直观体现了各部位表层土壤水分的空间变异性。
- Abstract:
- It is important to study the soil moisture content and its spatial variability of the dunes in spring for the vegetation construction and the sand-fixation project. This article has studied the surface soil moisture of windward, leeward and inter-dune lowland in April of semi-fixed dunes in south Gurbantonggut desert. The results showed that soil water content of inter-dune lowland (14.86%) is higher than that of windward (7.65%) and leeward (7.38%). The variation degree of soil water is positively related to the soil water content, and the variation degree order is soil water in inter-dune lowland, windward and leeward with the variation coefficient are 0.23, 0.15, 0.14 respectively. There is a clear spatial autocorrelation of soil water in all positions, the best fitted semivariogram models of windward and leeward are spherical model, and is exponential model for inter-dune lowland. There is big separation distance difference among three positions, whose separation distances are 24.32 m, 8.79m and 91.00 m. The contour line map of soil water content indicates that the soil water content of middle and bottom part is higher than that in the top part slope, it also exhibits the obvious spatial variability.
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备注/Memo
收稿日期:2009-9-15。
基金项目:国家自然科学基金（40771194）；北京市属高等学校人才强教计划（PHR200906125）
作者简介:张建兵（1984- ），男，四川广安人，硕士，主要从事干旱区资源与环境研究。E-mail：zhangjianbing666@163.com
通讯作者:熊黑钢（1956- ），男，教授，博士，现主要从事干旱区研究。E-mail：xhg1956@sohu.com