西双版纳的四籽柳群落

四籽柳群落是西双版纳山地沟谷常绿阔叶林的一种特殊类型,该群落结构简单,分层明显,林相相对整齐,虽有落叶现象,但季相变化不明显。上层树种以四籽柳占优势,形成单优势的四籽柳群落;幼灌层种类较少,不发达;草本层种类较多,但无明显优势种类;无大型木质藤本;大型附生植物不发达,但树干上有较多的苔藓附生植物。该群落是在云南南部山区特定的气候、特殊的立地、加上充分的水湿条件及适宜的土壤下发育形成的一种单优势的群落类型。该群落虽然有一定的四籽柳的预备种群,但缺乏更新苗,它是一种相对稳定并具有一定次生性的群落类型。

Salix tetrasperma community in Xishuangbanna

A Salix tetrasperma community was surveyed and its physiognomy and species composition were enumerated. The forest has an undeveloped shrub layer with fewer species,but luxurious herbaceous layer with rich species. It has also fewer vascular epiphytes but abundant non-vascular epiphytes. The forest is considered to be a secondary forest from the usually valley habitat in tropical montane in Southern Yunnan.