GIS Assisted Farmland Classification Research In Karst Area

The land is the important resource that the mankind rely for existence with development. The farmland is a very precious resources in karst areas. With the development of the social economy of Guizhou province,the population, resources, environment of the antinomy is increasingly outstanding, the land of the need competition is more and more vigorous. In many regions,the structure and function of the ecosystem system was influenced, the land resources have been serious destroyed, because of the conducting to the development of the depredation type of the land. And this situation caused the ecosystem environment problem,such as serious soil erosion and rocky desertification. For alleviating the contradiction between man and the earth ,many countries all carried on the inquisition and evaluation of the land resources in the word,and be science of land programming and exploitation basis. The quality evaluation of the farmland is the most important core contents of the land evaluation. Execute the resources evaluation in the exhibition land Scientific and carefully , is the importance basis that land develops to make use of a strategic research and reasonable, moderate the land development to make use of to protect a relation with land, carry out the reasonable of the land resources and can keep on the basic means of the exploitation. Farmland classification,graduation and appraisement could answer the question of the quantity,quality,values of the farmland.This text with the Nayong County, Guizhou province for study district, combine together RS,GIS technique, develop an information of "3S" technique at land to obtain well with the GIS data to manage and analyze the advantage of the aspect and space, use agriculture the ground Bean organic whole carry on a research. Use the RS and the GIS technique to carry on the farmland classification in the karst area. This text uses a ground of classification theories foundation,model and method from the agriculture, evaluation the index sign,some concepts and technique procedure, evaluation the unit divide ,the RS and GIS application,the result applied and related research etc. Aspect overview our country's agriculture use of farmland classification, settle class research make progress, and prospected farmland classification to with researches such as application study and the evaluation index sign selection of farmland classification. And wait a result to withdraw to win according to the cent low produce the farmland soil, and as to it's the space distribute model to put forward a study.The main result have:1 The land database of Nayong County2 the farmland classification model choice of the karst area of Guizhou province 3 The farmland classification foundation data and result series diagram pieces of Nayong County4 The low produce the farmland soil to distribute a series diagram piece of Nayong County5 The RS and the GIS technique apply in cent the technique route and operation method of farmland classification...