Research Of Temporal And Spatial Changing Of Soil Fertility Quality Based On GIS Technology--A Case Study Of Wujin City

Temporal and spatial changing of soil fertility quality is very important for sustainable development of agricultural ecosystem society and economy, and GIS (Geographic Information System) is now playing a more and more significant role in assessing soil fertility quality, based on its wide-ranging of application and powerfulness of function. This article, with the help of GIS, first uses Geostatistics to study temporal and spatial changing of soil fertility factors, such as Oganic matter Total N Total P, Total K Available K Available P pH and CEC, in Wujin City in nearly 20 years, and draws these conclusions: soil acidification of large area exists in the city, the content of N is generally lower but it tends to rise, the content of P and K is lower and it's still lowering, the content of Organic matter is medium but it tends to add, CEC's quality grade is higher but its content is lowering. Then, with the help of GIS, I selected 8 soil fertility factors mentioned above and soil texture as parameters, used blocks generated by overlaying each factor theme as assessing unit, modified Nemoro Fomular, and then I assessed the overall soil fertility quality of Wujin City, we know: the soil fertility quality of the city is generally medium or worse, in it, the district of Riverine polder the district of Menghe even fields the district of Taige even fields and the district of hilly lands are on "worse" level, and the district of Zhengheng polder the district of Lakeside polder and the district of Taoge even fields are on "medium" or "better" level. Finally, I put forwards some countermeasures to solve relevant problms.