芜湖市典型蔬菜地土壤有机质空间变异特征研究

在GIS和地统计学的支持下,以半方差函数为工具,分析了芜湖市典型蔬菜地土壤有机质含量的空间变异特征,并运用克立格法进行线性无偏最优插值,制作了土壤有机质含量的空间分布图。结果表明：研究区域土壤有机质含量具有强烈的空间相关性和良好的结构性;在80m步长范围内,0°、90°、135°的3个方向上有机质的半方差函数变化基本一致,表现为各向同性,超出此范围,各向异性显著增强;土壤有机质含量的空间分布具有明显的斑块状特点,菜地的东南部和中东部含量高,大部分区域土壤有机质的含量为20g·kg-1～30g·kg-1,分布土壤面积79500m2,占总面积的80.63%。

Spatial Variation of Soil Organic Matter of Typical Vegetable Land in Wuhu City

Supported by GIS and geostatistics and using semi-variogram as a tool,the spatial variation characteristics of soil organic matter of typical vegetable land was analyzed in Wuhu city.The spatial distribution map of soil organic matter was computed and quantitatively described by kriging method.The results showed that the semi-variogram of organic matter was best fitted by exponential model.The spatial heterogeneity degrees were strongly dependent and mainly produced by structural factors.Within 80m lag,the semi-variograms of soil organic matter were isotropic in 0°、90°、135° directions.Over this range,the anisotropic was remarkable enhanced.The spatial distribution of the soil organic matter showed block characteristics.Soil organic matter content was higher in the southeast and middle-east part.Soil organic matter content was between 20g/kg and 30g/kg in the most part with the area of 79500m2,occupying 80.63% of the total area.