西双版纳勐宋山区热带山地雨林的群落学研究

首次报道了云南西双版纳勐宋的热带山地雨林群落 ,该群落植物区系组成特殊 ,森林上层乔木组成中以古老的单室茱萸科 (Mastixiaceae)和紫树科 (Nyssaceae)植物为优势 ,亦富有木兰科 (Magnoliaceae)的长蕊木兰、云南拟单性木兰 ,红花木莲等系统发育上较原始的植物以及一些典型东南亚热带山地雨林群落的代表植物。通过对该热带山地雨林群落组成与结构的调查研究 ,认为该热带山地雨林可区分为沟谷和山坡 2个类型。沟谷群落类型以八蕊单室茱萸和大萼楠为乔木层优势种 ,可定义为八蕊单室茱萸—大萼楠林。山坡群落类型以云南拟单性木兰和云南裸花为优势 ,可定义为云南拟单性木兰—云南裸花林。

A study on the tropical montane rainforest in Mengsong, Xishuangbanna, S. Yunnan

A phytosociological study on the tropical montane rainforest in Mengsong, Xishuangbanna, S. Yunnan was presented in this paper. Occurred on the border area between S. Yunnan and Burma, the tropical montane rainforest has a rich biodiversity and particular floristic composition. The dominant trees in the forest are the species of Mastixiaceae, Nyssaceae, Magnoliaceae and Euphorbiaceae etc., which are shared by the montane rainforests in SE Asia in similar altitudinal zone. Based on the phytosociological plot survey of the tropical montane rainforest, the species composition, forest structure and ecological characteristics of the forest were analyzed. It is concluded that the tropical montane rainforest could be recognized as two forest formations, i. e. Mastixia euonymoides-Phoebe megacalyx forest formation and Parachmeria yunnanensis-Gymnanthes remota forest formation.