滇东南天然毛花酸竹林分结构初步研究

Preliminary Study on Stand Structure of Natrual Acidosasa hirtiflora in Southeastern Yunnan

对屏边县3个样地天然毛花酸竹林1455株竹秆进行每秆调查，分别调查秆龄、胸径等因子以研究其林分结构，结果表明：屏边天然毛花酸竹3月19日前后开始发笋，6月14目前后结束，其中4月26日至5月24日发笋较为集中；竹秆数随胸径变化呈正态分布；发笋存在大小年之分，初步判断奇数年是小年，偶数年是大年；相对直径为0．27～1．91，比一般树木林分的直径变动幅度更大；立竹整齐度为2．564，立竹均匀度为2．108，说明为不整齐竹林、不均匀竹林；林分密度与胸径存在负相关关系。

A study on stand structure of Acidosasa hirtiflora was conducted in Pingbian, 1455 bamboo plants were measured at culm age, DBH and so on. The results were as follows： natural Acidosasa hirti- flora stars shooting around 19th March to 14th June, and shooting time concentrated from 26th April to 24th May. The change of DBH was presented in Gaussian distribution; It had a distinction between high- output year and low-output year, preliminary judge indicated that odd-numbered was low-output year and even-numbered year was high-output year. The relative diameter was from 0.27 to 1.91 , which greater than the diameter of the tree stands volatility. The regularity and uniformity of stands are 2. 564 and 2. 108, which means irregular and uneven stands. There exists a negative correlation between the diameter at breast height and stand density.