Abstract:

 Controlling the land resources quantity, strengthening the farmland quality management and the mana gement of ecological protection are very important works at present. This article takes the southeast area of Da an City in Jilin Province for example, based on the study of land quality geochemical evaluation results and farmland classification with harmful elements integrated, to assess the level of land quality grade. The results indicate that 72.61 percent of the study area is assessed above third class. Land quality is generally good in the study area, the area of excellent and good land is relatively large, which were mainly chernozem, and the poor land is mainly saline alkali soil or salinized meadow soil. By trying to combine the productivity evaluation in the agricultural land classification results and the element contents in the geochemical assessment of land quality, the green productivity evaluation is formed.

Key words:  agricultural land classification, geochemical assessment of land quality, green productivity evaluation；Da'an City in Jilin Province