四川峨眉山珙桐群落的初步研究

本文通过对峨眉山珙桐群落分布、生境条件、区系组成、群落外貌和结构等方面的分析，认为该群落的性质是一种典型的中亚热带中山山地常绿、落叶阔叶混交林植被；适宜分布于温暖、潮湿、雨量充沛、云雾多、日照少、山势陡峻、沟谷切割很深的地段；群落中植物种类丰富，区系组成复杂，古老植物较多，从区系地理成分的分析反映出该区域植被具有中国—日本植物区系的基本特征。 该群落的自然更新是通过种子繁殖和萌蘖等方式的互补来实现，从而使其成为较稳定的群落。但目前该群落正遭到较严重的破坏，应采取人工辅助更新等切实措施加以保护。

PRELIMINARY STUDIES ON THE PHYTOCOMMUNITY OF DAVIDIA INVOLUCRATA IN OMEI MOUNTAIN OF SICHUAN

Through analysing the distribution, ecotope conditions, floristic com-position, structure and physiognomy of mixed Davidia involucrata commu-nity in Omei mountain, this paper showed the following characteristics ofit: 1. The nature of the community is typical of mixed evergreen-decidu-ous broadleaf forests in mountainous region of midsubtropics. 2. The suitable distributive area of the community is of warm andmoist habitat with abundant rainfall, frequent cloud and fog and less su-nlight. The land form is precipitous with deep cut valleys. 3. The mixed community is rich in species. The complex floristic co-mposition and the presence of abundant ancient remnants, show that thevegetation of this region has the basic features of the China-Japan flora. 4. The natural regeneration of Davidia involucrata community is acco-mplished by seedlings and tillers, which makes the pbytocommunity stea-dier. 5. The community is being severely destroyed, emergency measuresmust be taken to protect them, such as tending of wood and artificial su-pplementary regeneration etc.