基于GIS的土壤养分时空动态变化分析——以山东省茌平县为例

GIS SUPPORTED ANALYSIS ON DYNAMIC CHANGES OF SOIL NUTRIENT IN CHIPING COUNTY

本文利用茌平县1985年土壤普查数据和2003年的耕地地力调查分析数据,运用GIS软件和数理统计分析软件系统研究了该县1985～2003年土壤有机质、全氮、碱解氮、速效磷、速效钾养分的时空动态变化,在此基础上分析了养分动态变化的主要原因.结果表明,由于土地利用、管理方式以及耕作方式等的改变促使该研究区土壤养分（有机质、全氮、碱解氮、速效磷、速效钾）含量有了大幅度提高,土壤总体养分水平明显提升,其中有机质含量大于10g/kg的比例提高了56.7%,全氮含量大于1.0g/kg的比例增加了38.2%,碱解氮含量大于60mg/kg的比例增加了47.6%,速效磷含量＞20g/kg的比例增加了20%,速效钾含量大于150g/kg的比例提高了28.7%.

Choosing Chiping County as the research area, using soil survey data of 1985 and cultivated land productivity survey data of 2003, supported by GIS and statistical seftwares, the dynamic change of soil organic matter, total nitrogen, available nitrogen, available phosphor and available potassium, and their driving factors were analyzed. The results showed that the proportion of organic matter content that was greater than 10g/kg increased by 56.7% ; the proportion of total nitrogen content that was greater than 1.0g/kg increased by 38.2% ; the proportion of available nitrogen content that was greater than 60mg/kg increased by 47.6% ; the proportion of available phosphor content that was greater than 20g/kg increased by 20% ; the proportion of available potassium content that was greater than 150mg/kg increased by 28.7%. The land use type, management and cultivation fashion were the main driving factors for the changes in Chiping County.