基于GIS的九寨沟县域土壤养分空间变异特征

Spatial Variability Characteristics of Soil Nutrients in Jiuzhaigou County Using GIS Technique

利用地统计学方法和GIS技术研究了四川省九寨沟县土壤有机质、全氮、碱解氮、速效磷、速效钾和p H的空间异质性。结果表明,土壤有机质、全氮含量丰富,处于一级水平;碱解氮、速效磷、速效钾和p H的空间异质性相对较大,碱解氮含量均值为89.95 mg/kg,速效磷含量均值为36.83 mg/kg,速效钾含量均值为144.70 mg/kg,p H均值为7.91。提出应增施碱解氮肥、分类施用钾肥和磷肥,注意补充养分与调节相结合,并采取相应的措施调节土壤酸碱度。

By the methods of geo-statistics and GIS, the spatial heterogeneity of soil organic matter, total nitrogen, available nitrogen, available phosphorus, available potassium, and pH in Jiuzhaigou County was studied. The results showed that the contents of organic matter and total nitrogen were at grade I level, and others such as available nitrogen, available phospho-rus, available potassium, and pH had significant spatial heterogeneity, with mean content of 89.95 mg/kg, 36.83 mg/kg, 144.70 mg/kg and 7.91 respectively. According to the analysis above, these measures that adding available nitrogen, applying potash and phosphate fertilizer differently, and regulating soil pH were suggested.