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长江中上游地区马尾松林的分布非常广泛．根据调查资料，采用定性与定量分析相结合的方法，将这一地区的马尾松水保林分为2个类型组：纯林和混交林．再根据林分的乔木层和灌本层中优势种的不同，将水保林分为23个类型．然而从植被的观点看，他们均属于不同演替阶段或同一演替阶段不同生境的产物，且一般是不稳定的．
The distribution of Pinus massoniana in the middle and upper reaches of the Yangtze River is very extensive. According to the survey data, qualitative and quantitative methods were used to divide the masson pine forests in this region into two types: pure forest and mixed forest. According to the difference of the dominant species in the arbor layer and the arbor layer, the water conservation forest is divided into 23 types. However, from the point of view of vegetation, they all belong to the products of different habitats or different habitats in the same succession stage and are generally unstable.