毕节市土壤耕作层厚度的空间变异特征

Spatial Variation Characteristics of Soil Tillage Layer Thickness in Bijie City

为优化毕节市农业生产管理措施和实现耕地的可持续利用提供参考,2015年在毕节市采用规则网格和随机布点相结合的方法布设土壤采样点35个,测量土壤耕作层厚度;结合2006年采样点数据,运用地统计和GIS方法,研究土壤耕作层厚度的空间变异特征。结果表明:毕节市土壤耕层厚度最优插值模型为Rational Quadratic模型,其块金值/基台值为68.93%,为中等空间相关;土壤耕层厚度在不同母质中从高到低为砂页岩类、泥质岩类、河流冲积物、碳酸盐岩类、石英岩类、紫色岩类、基性岩类;土壤耕作层厚度与地形因子的相关性由弱到强依次为坡向、坡度、高程。毕节市土壤耕作层厚度在空间具有中等相关,耕层厚度主要受土壤类型、母质和地形等自然因素的影响。

In order to optimize the management measures of agricultural production and realize the sustainable utilization of cultivated land in Bijie City, 35 soil sampling points were set up in Bijie City in 2015 with the combined method of regular grid and random distribution of points, and the thickness of soil tillage layer was measured. Combined with the data of sampling points in 2006, the spatial variation characteristics of soil tillage layer thickness were studied by geostatistics and GIS method. Results： The optimal interpolation model of topsoil depth in Bijie City was Rational Quadratic model, and its nugget / base table value was 68.93%, which was middle spatial correlation. The thickness of soil tillage layer from high to low in different parent materials was sand shale, argillaceous rock, fluvial alluvium, carbonate rock, quartzite, purple rock, basic rock, The correlation between topographic factors and the thickness of tillage layer was in order of slope aspect, slope degree and elevation. The thickness of tillage layer in Bijie City had a middle correlation in space. The thickness of tillage layer was mainly affected by natural factors such as soil type, parent material and topography.