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西南桦是我国热带、南亚热带地区以及部分中亚热带地区的速生、珍贵用材树种。论述了我国西南桦天然林水平分布和垂直分布的基本特点，探讨了西南桦的适生条件，为西南桦天然林的保护与人工林的发展提供理论依据。
Southwest birch is China’s tropical, subtropical regions and parts of the subtropical region of fast-growing, precious timber species. The basic characteristics of horizontal distribution and vertical distribution of Betula albosinensis natural forest in China were discussed. The suitable conditions of Betula albosinensis were discussed, which could provide the theoretical basis for the protection of Betula albosinensis natural forest and the development of plantation.