| The paper is based on land quality geochemical assessment, carries out contrast research and integration study with farmland gradation by taking Qixian County of Shanxi Province as an example. To establish a land evaluation system is the actual demands for realizing the land management change from the view of quantity to quality and ecology.The key contents and results as follow:(1) The paper analyzes the soil geochemical setting of the study area and different areas, and found out the regional geochemical distribution feather of elements in soil. In the surface soil of Qixian the level of soil nutrient elements' content is generally low except P, Zn, B, I; and the heavy metal elements' content is less than that of China' soil quality standard(two grade).On the whole, fine and good grade land has a majority in the study area.(2) The study area is divided into eleven farmland physical grades, seventeen use grades and eight grades, and finds out farmland grades' distribution be related to natural attributes, the level of land use and socio-economic, and shows a tendency which northern part grade was higher than the south .(3) The two land quality evaluation methods are comparatively analyzed from various aspects, and finds they not only exist similarities, also present differences.(4) In the integration study, analyzes and expounds the connotation of non-polluted and green capacity, integration study′s ideas and methods, and establishes the evaluation index system. At last, proposes a simple and feasible integration study proposal.(5) The paper references theory and method of land quality geochemical assessment and farmland gradation, and based on their surveys and evaluation results, carries out their integration research, to achieve effective integration of results, deepens study on the land quality evaluation. |
