乌江流域喀斯特区造林困难程度评价及分区

An evaluation and dividing area on degree of planting difficulty in Karst region of Wujiang Watershed

乌江流域喀斯特区环境有四大特点，即环境因子的利弊兼容性；水分亏缺的时空异质性；水分亏缺程度的派生性和环境改造的艰巨性。文中提出了相应的利用对策。用困难度和困难度指数评价并排序了36个县的困难程度。用系统聚类和主分量分析方法，对困难程度进行分区，共分出5个区。Ⅰ，Ⅴ为造林最困难区，Ⅲ，Ⅳ为较困难区，Ⅱ为一般困难区。

This paper sum up four characters of Karst environment in Wujiang Watershed. Those are as follows: advantage and disadvantage coexistence of environment factors, time and space heterogeneity of water deficit, derivation of water deficit degree, difficulty to reconstruct environment. And correlative utilization strategy is also proposed in this paper. The difficult degree of 36 counties were ordered and evaluated using the difficult degree and index of difficult degree. Systematic clustering method and PCA are used to divide area. 36 counties are divided into 5 areas. Ⅰ, Ⅴ area are the most difficult region, Ⅲ,Ⅳ area are more difficult region and Ⅱ area is difficult region.