Abstract:

Agriculture and livestock production efficiency and human living quality are impacted directly by the land quality. Quantity and quality of land resource and coordination management of ecological protection were the direction of land resource management. It was necessary to evaluate the land quality for optimized allocation and sustainable use of land resource and sustainable development of social economy.  Abundant geochemical data were obtained by the multi-objective regional geochemical survey of Jilin Province. The geochemical assessment1∶250,000）of land quality in DehuiNongan district, the western and middle Jilin Province was taken. The results indicate that the land quality in the east is better than that in the west. The quality of black soil was best, but 7.97 percent of phaeozem had been changed into middle grade or low grade land. 43 percent of chernozem belonged to middle and low product field, thus the black soil degenerated seriously. Since slightly sand soil kept better land quality, the soil might be exploited through intensification of sand regulation and farmland protection. Optimal cycle of regional eco-agriculture would be promoted by the rational land-use mode taken according to land quality.

Key words: land quality, geochemical assessment, soil fertilization, soil environment