Geochemical Land Quality Evaluation And Analyze Based On GIS In The South Of Songnen Plain

Soil is the fundamental of agricultural production and land is the unsubstitutional product material that all the people rely on Its environmental quality has a direct influence on agricultural structure, land output and quality of its produces. Along with the development of society and the increasingly pressure from population, resources and environment, the demands of agricultural produces and its quality are heavier and heavier. Land, along with population, resources, environment and foodstuff is becoming the hot issue attracting the focuses of the entire world.Utilizing land resources reasonably, in our country, is a basic national policy and basic conditions to society development. And it is important to the development of society and to the national economy and people's livelihood. In order to gear to the agricultural structure adjustment promote non-harmful agricultural produces, keep sustainable development of agriculture and enhance the general productivity of land, it's urgent to conduct a comprehensive survey on soil quality and its environmental conditions. Only when we have an all-sided understanding of the land fundamental capacity, soil fertility, environmental conditions and soil obstacles can we work out scientific specifications and regulations for safe agricultural production, agricultural sustainable development and soil improvement and proper use This dissertation, taking the south part of Songnen Plain as an example and employing advanced technology of computer and GIS(Geographical Information System)carried out the survey of land capacity and its assessment.Some of the achievements of this dissertation Can be summarized as follows:1.Soil fertility assessment.This paper takes south part of Songnen Plain as the example as a ease study, collects and standardizes relative information of maps, data, texts and documents. The assessment units are created by overlaying soil map with land use map. The indicators are backed with various parameters such as useful elements, harmful elements, and organic pollutions and so on. According the GIS technology, we make the evaluation of the grand quality and generative ability.The results show that, south part of Songnen Plain adapt to farm because of its fitting elements quantum and pH value.2. Recommended fertilization.We use GIS technology to order the grade of the soil status, and the GPS for orientation. Using many analysis methods, we continually study the changing trend of the soil and chemical elements, and the fertilization methods for different grade of the ground at the same time.According to the study, a suggestion would be made that, because of the lack of P and Corg, we should use these kinds of fertilizers to keep a good condition of these soil.