基于GIS和修正法的耕地定级研究:以图们市为例

Arable land grading based on GIS and modifying method:a case study of Tumen City

以吉林省图们市为例,在耕地分等成果的基础上,借助ArcGIS和统计软件,运用修正法,建立修正因素体系,对面状因素和扩散因素采用不同方法进行量化和赋分,在此基础上对国家自然质量等指数进行修正计算出定级指数,利用总分频率曲线法将图们市耕地划分为5个级别,并得到了图们市耕地级别分布图。结果表明,图们市耕地级别面积构成呈现出“中间大两边小”的特点,耕地级别分布受交通区位条件影响明显,级别高低与海拔高度、地形坡度、土壤质量和灌溉条件等耕地本身的自然条件有密切关系。

Taking Tumen City of Jilin as an example,on the basis of the arable land classification,using ArcGIS and statistical software,the modifying method is used to establish a modifying factor system,and different methods are used to quantify and assign the area factors and diffusion factors.Furthermore,the national natural quality index is revised to calculate the grading index.The total score frequency curve method is used to divide the arable land of the Tumen City into five levels,the map of arable land level distribution in Tumen City is also produced.The results show that the composition of arable land level area in Tumen City is characterized by“large in the middle and small at both ends”,and the distribution of arable land level is obviously affected by traffic location conditions.Moreover,the level is closely related to the natural conditions of arable land,such as altitude,terrain slope,soil quality and irrigation conditions.