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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。
There are four major characteristics of the Wujiang River Basin karst environment, namely, the pros and cons of environmental factors; temporal and spatial heterogeneity of water deficit; the derivation of water deficit and the arduousness of environmental reconstruction. The paper proposes the corresponding countermeasures. The degree of difficulty in 36 counties was evaluated and ranked by the degree of difficulty and difficulty index. Using the method of cluster analysis and principal component analysis, the degree of difficulty is divided into five areas. Ⅰ and Ⅴ are the most difficult areas for afforestation, Ⅲ and Ⅳ are the more difficult areas, Ⅱ are the general difficult areas.