滇西南旱冬瓜天然林的林分特征研究

Study on Stand Characteristics of Alnus nepalensisNatural Forest in Southwest Yunnan

为探讨速生乡土树种旱冬瓜生长特性,对滇西南864株旱冬瓜优良植株生长情况进行调查及统计分析,并选择宁洱县松山自然保护区旱冬瓜天然林开展群落调查。结果表明,旱冬瓜优良资源主要分布于阴坡及半阴、半阳坡,其生活习性偏向于阴性,25°以下的平缓坡面适宜旱冬瓜植株的自然生长;旱冬瓜占优势的自然群落具有乔木层、灌木层、草本层和层间附生植物,群落植物种类丰富,区系成分复杂,主要以热带和温带成分组成为主,其中热带分布属占绝对优势,并呈现出一定的过渡性特征。

In order to find out the growth and stand characteristics of Alnus nepalensis,a fast-growing indigenous species of Yunnan,based on the investigation data of 864 individuals during earlier stage superior tree selection work,the natural Alnus nepalensis communities located at Songshan Nature Reserve of Ning＇er county were surveyed.The results indicated that the excellent resources of Alnus nepalensis were mainly distributed at shady slopes and semi-shady slopes,with the life habit of prefer shade,gentle slope under 25° was suitable for the natural growth of Alnus nepalensis.As far as the Alnus nepalensis natural community was concerned,the structure could be divided into tree layer,shrub layer,herbaceous layer and epiphytes between layers,the species composition was quite rich,and the floristic components were complicated,with the tropical and temperate especially the tropical elements as the dominant part,showed the transitional characteristics to some extend.