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以陕西省蓝田县为例,在GIS技术支持下,结合地貌信息分析、经典统计学和地统计学方法研究土壤养分空间变异性。描述性分析表明土壤养分受结构因素和随机因素的共同作用,具有中等强度的空间相关性。地统计学分析选取指数模型为半变异函数模型,从块金值、基台值、变程方面描述性分析说明了土壤养分在村级采样尺度上具有一定的规律性和内相似性。建立研究区DEM,将地统计分析与地貌类型单元分区分析结合,得出土壤有机质含量大部分偏低,水解氮由西北向东南增高,有效磷呈不同小范围集中聚集现象的结论。
Taking Lantian County in Shaanxi Province as an example, with the support of GIS technology, the spatial variability of soil nutrients was studied by combining geomorphological information analysis, classical statistics and geostatistics. Descriptive analysis shows that soil nutrients have a moderate intensity of spatial correlation due to the combination of structural and random factors. Geostatistical analysis of the selected index model for the semi-variogram model, from the block value of gold, abutment value, range of descriptive analysis shows that the soil nutrients in the village sampling scale has a certain regularity and internal similarity. The establishment of DEM in the study area combined the geo-statistical analysis with the zonal analysis of the geomorphic type units to draw the conclusion that most of the soil organic matter content is low, the hydrolyzed nitrogen increases from northwest to southeast, and the available phosphorous accumulates in different small areas.