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用经典统计学与地统计学方法相结合,研究了甘肃省武威灌漠土耕层土样中B、Cu、Fe、Mn及Zn等5种微量元素有效含量的空间变异特征。结果表明:①99.17%土样缺乏有效Zn,93.33%的土样缺乏有效Fe。描述性统计所得变异系数在13.32%(有效Mn)~42.54%(有效B)之间。②球状模型和指数模型为土壤微量元素的最佳拟合模型,各元素的块金值、最大相关距及块金值与基台值之比C0/(C0+C)分别在0.001~0.429、192m~477m及0.126%~26.459%(有效B)之间。土壤微量元素含量的分形维数在1.804~1.947之间,土壤B的分形维数最低。③表征土壤微量元素空间变异的参数如变异系数、C0/(C0+C)及分形维数D之间均有一定的相关关系。④Kriging插值结果显示人为因素等表生作用对土壤有效B含量的空间分布影响较大,土壤Cu、Mn、Zn及Fe含量的空间分布则主要由成土母质与地形所决定。
Using the combination of classical statistics and geostatistics, this paper studied the spatial variability of five trace elements contents of B, Cu, Fe, Mn and Zn in soil samples from desertified desert in Wuwei of Gansu Province. The results showed that: (1) 99.17% soil samples lacked effective Zn, 93.33% soil samples lacked effective Fe. The coefficient of variation of descriptive statistics was between 13.32% (effective Mn) and 42.54% (effective B). The spherical model and exponential model are the best fitting models of soil trace elements. The ratio of the nugget value, the maximum relative distance and the nugget value to the abutment value of each element are in the range of 0.001-0.429, 192m ~ 477m and 0.126% ~ 26.459% (effective B). The fractal dimension of soil trace element content was between 1.804 and 1.947, and the fractal dimension of soil B was the lowest. ③ The parameters that characterize the spatial variation of soil trace elements such as the coefficient of variation, C0 / (C0 + C) and the fractal dimension D have some correlations. The results of Kriging interpolation showed that the superficial effects of anthropogenic factors on the spatial distribution of soil available B were significant. The spatial distribution of soil Cu, Mn, Zn and Fe was mainly determined by the parent material and topography.