"土地"是一个综合性的科学概念,它反映地球表面某一区域内的一个具体地段,这个地段包括地质、地貌、气候、土壤、水文和动植物等全部自然地理因素,也包括人类社会活动对自然环境的影响,故是一个自然地理综合体,也是一个地区历史发展的产物,具有特定的地理历史意义。

In this paper, according to the field inverstigation and relative informations, the auther analysis and studies the characteristics of physical geography and the factors of land differentiation in Ankang District, and presents a principle of classifing land in mountain area, delimiting the identified index of each type and the system of land classification. In addition, from the Point of view of dialectical materialism and synthetical study, the paper expounds the features of various type of land and makes different potential valuation,In order to make people scientificially understand complex natural environments in mountainous area and manage better agricultural production, the author suggests a way to use rationally each type of land.