【摘要】 以黑河中游荒漠绿洲过渡带斑块植被区土壤为研究对象,对土壤含水量与土壤有机质含量空间变异特征及两者相关性进行研究,并对土壤含水量和土壤有机质含量的空间变异函数模型进行拟合。结果表明:(1)20~40 cm土层的土壤含水量空间变异性最为强烈,C_V=1.780;而40~60 cm土层的土壤有机质含量空间变异性最为强烈,C_V=0.561。(2)0~120 cm土层的土壤含水量空间变异函数理论模型均为指数模型;0~60 cm土层的土壤有机质含量空间变异函数理论模型为纯块金模型;而60~120 cm土层的土壤有机质含量空间变异函数理论模型为指数模型和球状模型。(3)土壤含水量和土壤有机质含量均随土层深度的增加而相应的增加,且二者之间呈显著对数相关关系,R~2=0.9597。更多还原

【Abstract】 In desert-oasis ecotone, soil moisture and organic matter are the important factors to maintain the growth of natural vegetation. In this study, the methods of traditional statistics were applied to analyze the contents of soil moisture and organic matter and their spatial variability in the desert-oasis ecotone in the middle reaches of Heihe river. The result showed that the coefficient of variation(C_V) between the contents of soil moisture and soil organic matter increased at first and then decreased. The variability in soil moisture and organic matter was the most intense,respectively, at soil layer of 20-40 cm and 40-60 cm with CV value of 1.780 and 0.561. The spatial variability model of soil moisture at soil layer of 0-120 cm was index model, and that of soil organic matter was pure gold model at soil layer of 0-60 cm and was index and spherical model at soil layer of 60-120 cm. The contents of soil moisture and organic matter were increased with soil depth. There was a significant logarithmic correlation between soil moisture and soil organic matter(R~2= 0.9597).更多还原