江西省土壤抗侵蚀性空间变异表述方法研究  

Research on Spatial Variability Statement Methods of Soil Anti-erodibility in Jiangxi Province

作　　者：钟壬琳[1] 肖潇[1,2] 张平仓[1] 岑奕[1] 

机构地区：[1]长江科学院水土保持研究所,武汉430010 [2]华中科技大学软件学院,武汉430074

出　　处：《长江科学院院报》2010年第5期13-18,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点基础研究发展计划(2007CB407203)

摘　　要：依据江西省第二次土壤普查资料,以侵蚀-生产力评价模型(EPIC)中的K值作为土壤抗侵蚀性的衡量指标,通过ArcGIS9.2和GS+9.0软件,分析比较了反距离权重插值法、径向基函数插值法和普通克里格插值法。对江西省土壤抗侵蚀性空间插值的精度。结果表明:研究区域土壤抗侵蚀性的变化范围为0.1492～0.4157,均值为0.2839,变异系数为18.06%,存在中等程度的空间变异性,块金系数为11.09%,具有强烈的空间相关性;综合考虑各种插值方法的交叉验证结果和插值效果,认为普通克里格插值法最佳;研究区域土壤抗侵蚀性的空间分布有从东、南、西向中部、北部和东北部不断减小的趋势,且与各土壤亚类抗侵蚀性均值的空间分布规律趋于一致。On the basis of the second soil survey data of Jiangxi Province, this paper took K values of EPIC model as measuring indicators of soil anti-erodibility, compared the accuracy of different interpolation methods, including IDW（ inverse distance weighted）, Spline and Ordinary Kriging, by the software of ArcGISg. 2 and GS ＋ 9.0 for the spatial interpolation of soil anti-erodibihty in Jiangxi Province. The results show as follows ： The spatial variability of soil anti-erodibility at the study area is moderate difference, with the range from 0. 149 2 to 0. 415 7, mean of 0. 283 9, and variance coefficient of 18.06%. The nugget-to-sill ratio is 11.09%, which indicates that the soil an- ti-erodibility has strongly spatial relativity in the study area. Taking account of cross-validation and interpolation resuits comprehensively, Ordinary Kriging interpolation is the best of three methods： Spatial distribution of soil antierodibility appears with the decreasing trend from the east, south, west to the central, north and northeast in the study area; in comparison with the mean of each soil sub-class anti-erodibility, both of them have the same law of spatial distribution.

关 键 词：土壤抗侵蚀性 空间插值方法 空间变异特征 

分 类 号：S157[农业科学—土壤学]