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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24.32m,8.79m,91.00m。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。
It is of great significance to study the soil moisture content and its variation characteristics in spring dune on the construction of sand dune vegetation and windbreak and sand fixation. The results showed that the soil water content (14.86%) of the semi-fixed sand dune in the south of the Gurbantunggut desert in early April was much higher than that of the windward slope (7.65%) and the leeward slope Leeward slope (7.38%). The variation of surface soil moisture was positively correlated with the soil water content, especially the inter-mound lowland> windward slope> leeward slope, and the coefficient of variation was 0.23,0.15,0.14. The spatial autocorrelation of windward slope, leeward slope and inter-mound lowland soil moisture is high. The first two can well fit into the spherical model, the latter is the exponential model. The variation ranges of the three are 24.32m and 8.79 m, 91.00 m. On the one hand, the contour map of surface soil moisture of various parts of the dune shows that the soil moisture in the middle and lower part of the slope is higher than the upper part, on the other hand, the spatial variability of surface soil moisture in each part is also intuitively shown.