泥石流频发区人工新银合欢林群落特征

Community characteristic of plantation of Leucaena leucocephala in the area with high-frequency debris flow

采用植物群落学研究方法,对干热河谷泥石流频发区人工新银合欢林进行研究。结果表明:该人工林群落植物种类比较简单,科属组成极为分散,区系成分单调;科级地理成分热带性质较强(41.91%),属级地理成分也以热带性质为主(45.16%);群落物种组成以由中、小型叶面积、单叶、非全缘、纸质和革质的地面芽植物为主;垂直结构单调,虽可分为乔木层、灌木层、草本层,但乔灌层均以新银合欢占优势,草本层盖度低。群落处于不稳定的状态,应在人为干预的手段下进行分化和演替。

Based on the phytocoenological method,the characteristics of Leucaena leucocephala community in the area with debris flow occurring frequently in hot and dry valley of Jinsha River Basin was researched.The results showed that there are few plants species in the Leucaena leucocephala community.Its family and genus are scattered composition.The geographical element is simple,with a relatively higher connection to the tropical element on family level by 41.91% and on genus level by 45.16%.It was characterized by hemicryptophytes with mesophylls and microphylls,simple,coriaceous,papery,unentire leaves.Although the vertical structure of community can be divided into tree layer,shrub layer and low coverage herb layer,Leucaena leucocephala dominated in tree layer and shrub layer.The Leucaena leucocephala community was unstable,we must adjust the structure of the community to progressive succession.