毛竹纯林与竹杉混交林竹材形态质量的比较研究

Comparison Study on Timber Quality of Pure Bamboo Forest and Mixed Forest

通过对毛竹杉木混交林、毛竹纯林5个竹材形态质量指标的比较研究,结果表明:竹杉混交林立竹平均胸径较毛竹纯林大5.0%;立竹全高、枝下高与立竹胸径呈正相关,竹杉混交林较毛竹纯林分别增加9.0%、8.7%,竹杉混交林对立竹全高、枝下高增大的贡献率小,分别为2.7%、3.1%;竹林经营类型对立竹胸高、竹壁厚度的影响较全高、枝下高大,竹杉混交林较毛竹纯林提高6.9%;尖梢度值与立竹径级不相关,与竹林经营类型密切相关,竹杉混交林显著大于毛竹纯林,增加幅度达20.9%。尖梢度值≥0.4的为竹材匀称竹林,<0.4的为竹材不匀称竹林。

Comparison study was carded out on five morphological quality index of culm from pure bamboo forest and mixed forest of Phyllostachys heterocycla var. pubescens and Cunninghamia lanceolata. The result showed that mean DBH of bamboo from mixed forest was 5% higher than that from pure forest. Whole and stem height had positive correlation with DBH, and that of mixed forest increased by 9.0% and 8.7% respectively compared with that of pure forest. Mixed forest contributed only 2.7% and 3.1% to total and stem height of bamboo. Management type affected thickness of culm wall at DBH more greatly than total and stem height. Thickness of culm wall at DBH from mixed forest increased by 6.9% compared to that from pure bamboo forest. The taper had no correlation with DBH, but close correlation with management type. The taper of mixed forest was larger than that of pure one, by 20.9%.