西双版纳勐腊南贡山季风常绿阔叶林蕨类植物初步研究

A study on ferns in monsoon evergreen broad-leaved forest on Nangong Mountain in Mengla, Xishuangbanna, China

勐腊南贡山季风常绿阔叶林(山坡类型)1 hm2面积样地上有蕨类31种,在该森林群落草本层中占有 极其显著的地位。这些蕨类植物的地理成分分析表明它们属于亚洲热带的印度——马来西亚植物区系的一 部分,表现为东南亚热带北缘植物区系的性质,并有热带山地向亚热带山地过渡的特点。在生态表现上,它们 的生活型组成是高位芽蕨类(地生蕨种)占6．45％;地上芽蕨类12．90％;地面芽蕨类32．26％;地下芽蕨类 32．26％;附生蕨类16．13％。由于该地区的季节性干旱气候,高位芽蕨类较少和几种附生蕨类的附生高度也 相对较低,蕨类植物种群的数量与林下空气湿度及土壤表层的湿度一般成正相关。

Ferns were surveyed from 400 small plots of 5 m×5 m in the monsoon evergreen broad-leaved forest in Nangong Mountain in Xishuangbanna. 31 fern species of 22 genera of 14 families were recorded from the total 1 hm^2 sampling area. The population compositions of these fern species were enumerated. The geograph- ical elements at species, genera and family levels were analyzed. It is concluded that the fern flora is part of Indo-Malaysia tropical flora. Additionally,the life forms of these ferns were also analyzed and enumerated.