云南东南部松属植物分布的特点

本文从云南东南部松属植物的种类入手,探讨了其生态特性及分布特点。通过分析可以看出由各个方向分布而来的松属各种在此都趋向于其分布的边界,使得本区成为松属植物中不同区系成分分布的一个限制地域,并就产生这种特殊分布的原因进行了探讨;进一步从松属植物分类上分析了国产松属性状状态及其组合的分布,继此又对我国各地区所产松属植物与西南地区进行了比较,得出了云南东南部是我国松属植物发育较好和多样化的一个地区。此外,还分析了本区松属的特有种和替代种。并提出了大明松与黄山松的区别点属黄山松的变异范围之内,应予归并。

DISTRIBUTIONAL CHARACTERISTICS OF PINUS L.IN SOUTHEAST YUNNAN

Southeast Yunnan is situated at 22°30′--23°55′N., 101°30′--106°10′E.. Basedon the analysis of distribution of 6 species and 2 varieties of Pinus L. in thisarea, we conclude following distributional characteristics: 1, This area is theeast boundary of P. armandi Franch., P. kesiya Gord. var. langbianensis Gaussen; thewest boundary of P. massoniona Lamb., P. taiwanensis Hayata, P. fenzenliana Hand.-Mazz.; the south boundary of P. armandi Franch., P. massoniana Lamb., P. taiwan-ensis Hayata; the north boundary of P. kesiya var. langbianensis Gaussen. exceptfor dry-hot river yalley. Therefore this area is one of the restricted areas of dis-tribution of Pinus L.. Some causes of forming the special distributional type arediscussed. 2, In the classification of Pinus L. in China, the states of morphologicalcharacteristics and their combination in southeast Yunnan are compared withthat of other large areas, and come to the conclusion that southeast Yunnan is oneof mere developed and diversified areas of Pinus L., 3, The endemic and replacespecies in this area are also discussed. In addition, the merging of P. taiwanensisHayata var. damingshanensis Cheng et L. K. Fu into P. taiwanensis Hayata is dis-cussed.