黔北山区几个立地因子对撑绿竹生长的影响

Effects of Several Site Factors on the Growth of Chenglü Bamboo in Mountain Region of North Guizhou

分析了在黔北山区31个样地中6个立地因子对撑绿竹平均胸径、平均竹高及丛平均株数生长的影响。结果表明：（1）海拔、小地形部位、土层厚度及坡度对撑绿竹生长的影响较大,存在显著差异或极显著差异,而不同坡向和土壤类型对撑绿竹的生长则没有显著差异;（2）造林地应选择在海拔700 m以下（尤其是高产竹林）,700~800 m则选择背风的山冲山洼,800 m以上不适应撑绿竹生长;（3）小地形部位的坡上部（山脊）不太适应于撑绿竹生长而不宜栽种,其余河滩、山冲（山洼）、坡下部及坡中部等均可栽种撑绿竹;（4）土层厚度中的薄层土（〈40 cm）不太适应于撑绿竹生长,造林地应选择在中、厚层土壤上,最好是厚层土;（5）紫色土和石灰土、阳坡和阴坡均适应于撑绿竹的生长,但紫色土、阳坡生长的撑绿竹相对更好一些。

Chenglü bamboo is a hybrid of Bambusa pervariabilis McClure as female with Dendrocalamopsis daii Keng as male parent crossed by Guangxi 2nstitute of Forestry Science twenty years ago. Several priority clones such as No. 3, No. 6, No. 8 and No. 30 had been selected. The clone No. 3 was introduced to the plant in north Guizhou for pulpwood. Through a survey of 32 sample plots, the effects of 6 site factors on the diameter, height and culm number of the Chenglü bamboo were studied. The results showed that （2）The altitude, slope position, soil thickness and slopeness had the significant effects on the growth of Chenglü bamboo, but the slope aspect and soil types had not significant effects on the growth of Chenglü bamboo. （2）The forestation site should be selected below 700 m （especially for the high yield bamboo forest）. The sites between 700 and 800 m should be selected on the depression and foot of the hills. The sites above 800 m were not suitable for the growth of the bamboo. （3）The upper slope was not suitable for the growth of the bamboo, the depression, mid position and foot of the hills were all suitable for planting the bamboo. （4）The thin soil was not suitable for the growth of the bamboo, and the planting sites should be the soils with middle to thick layers, especially for the high yield of bamboo forest. （5）The purple soil and limy soil, south and north slope aspects were all suitable for the growth of the bamboo, but the growth of the bamboo were better on the purple soil and south slope.