星座"聚类法在山区农业生态经济区划中的应用——以广西融水苗族自治县为例

APPLIED STUDY ON "GREY CONSTELLATION" CLUSTER ANALYSIS IN THE AGRI_ECOLOGICAL ECONOMIC REGIONALIZATION OF MOUNTAIN AREA——TAKING RONGSHUI MIAOZU AUTONOMOUS COUNTY OF GUANGXI ZHUANGZU AUTONOMOUS REGION AS AN EXAMPLE

以山区农业生态经济区划原则为基础，应用“星座”聚类分析方法，将融水县划分出２ 级４个农业生态经济类型区。

The agri_ecological economic regionalization of mountain area is defined as classification based on the differentiation of structure and function and the spatial pattern in the agri_ecological economic system of mountain area.Based on principles inculding relative consistency,regional conjugation and limitation period etc,the characteristics of typical example of the mountain county_Rongshui Miaozu Autonomous County in northern Guangxi Zhuangzu Autonomous Region,and employing the method of correlative stretch of nature_ecological and social economic indexes,this paper selects 10 indexes on agri_ecological economic system.Taking the town as a basic classification unit and applying the method of "grey constellation”cluster analysis,The county is divided into two regions and four subregions of agri_ecological economics and the present situations and trends of agricultural development of the regions are comprehensively analysed.This,on one hand,provides the foundation of exploitation and utilization of the agricultural land resources, on the other hand,puts forth a general method for agri_ecologicl economic regionalization in mountain area. “Grey constellation” cluster analysis is a graphic method of multi￣analysis,its procedures as the following:firstly,primordial data are dealt with by applying the method of extreme difference standardization (∮ ij =X ij -X j min X j max - X j min ×180°),in which i and j stands for stample(the town) and index( classified variable),respectively;secondly,the coordinate value of each sample is calculated from the formula( X i =Σ p j=1 W j cos ∮ ij ,Y i =Σ pj=1 W j sin ∮ ij ),among which x i、y i and W j stands for absicissa、ordinate and weight,respectively;thirdly,each sample is located in star map on the basis of the value of x i,y i ,then the star points are clustered together and divided by which quality is similar as each other,so it become a constellation cluster map;finally,each and every comprehensive index value is numbered in link of the formula( z i =Σ pj=1 ∮ ij w j,0≤w j≤1 , Σ pj =1 w j =1),the arrange based on them examines the result of "grey constellation” cluster anaylsis. In view of above mentioned,the result of general agri_ecological economic regionalization in Rongshui County was the following:A_the agricural region of comprehensive exploitation in southeastempeak forest and hills and plains;B_central and northern moutains and hills region:Sub_divided into: B Ⅱ, Yuanbaoshan_Gunbei middle and low mountains headwaters forest,timberproducig forest,cattle nd sheep、special local produce and medicine materials subregion; and B Ⅰ,B Ⅲ,central Beijiang Valley and northeastern low mountains and high hills timber along the Rongjiang river-producing forest、cattle and sheep and special local produce subregion.