毛竹林不同留养度数对生长和产量的影响

作者对毛竹林不同留养度数(二度、三度、四度、五度、六度)和竹林结构、竹材产量等之间的关系进行了研究,得出如下几点。 1.不同留养度数的毛竹林、其新竹数量、新竹胸径和竹材产量的差异是显著的。 2.不同留养度数的毛竹林对立竹的密度、匀度、径阶、叶面积指数等林分结构因子有显著影响。 3.a.留养四度的毛竹林,竹材产量最高,笋产量也高。b.留二度、三度的毛竹林,成竹率高、成竹数多。c.阴坡留养五度、六度的毛竹林可增大立竹粗度,提高竹材质量。

EFFECTS OF DIFFERENT REMAINING YEARS ON THE GROWTH AND OUTPUT OF PHYLLOSTACHYS PUBESCENS

The present paper dealt with studies on the relation between different remaining years (4 years, 6 years, 8 years, 10 years and 12 years) and the structure and output of Ph. pubescens stands. The results showed: (1) The stands with different remaining years presented outstanding difference in the numbers and breast-height diameter of new culms and the output of bamboo timber. (2) Those stand structure factors such as the density, even degree and diameter grade of standing culms and the leaf area index were influenced greatly by remaining years. (3) a. The output of both timber and shoot was highest in forests keeping 8-year old culms. b. The rate of adult culms was high in those with 4-6 remaing years. c. The thickness and quality of standing culms increased in the northern-slope-located stands of 10-12 years.