杉木毛竹混交林的毛竹地下鞭根结构特征研究

STUDY ON BAMBOO UNDERGROUND STRUCTURE OF MIXED FOREST OF CHINESE FIR AND BAMBOO

采用固定标准地法 ,对尤溪县包溪林业采育场 1 974年在阔叶树毛竹混交林皆伐迹地上营造杉木纯林后形成的杉木毛竹混交林进行地下结构的调查。结果表明 ,杉木对毛竹地下结构的生长有一定的促进作用 ,对毛竹竹鞭向纵深延伸、壮芽数的比例提高有促进作用。杉木密度为 90 0～ 1 3 50株 /hm2 时 ,壮龄鞭比例比较高 ,毛竹地下结构比较优化 ,更新快 ;毛竹竹鞭有 92 8%分布在 0～ 4 0cm土层中 ,其中 0～ 2 0cm土层中占 60 %以上 ,大于 4 0cm土层中仅占 7 2 % ;杉木能促进竹鞭向纵深发展 ,随杉木密度的增加 ,0～ 2 0cm层鞭根减少 ,2 0cm以上鞭根明显增加 。

By the method of fixed plots,underground structure of mixed forest of Chinese fir and Phyllostachys heterocycla cv. pubescens, which was established in 1974 by planting the pure Chinese fir forests on felled bamboo forests,was investigated.The results showed that the growth of bamboo rhizomes was atimulated by Chinese fir trees and the proportion of healthy buds increased.When the density of Chinese fir was 900～1350 trees per hectare,the proportion of healthy rhizomes root was higher,and underground structure of bamboo was optimization.There were about 92.8 percent of healthy rhizomes in the depth of 0～40?cm soil layer,over 60 percent of which distributed in the depth of 0～20?cm soil layer.Chinese fir trees stimulated rhizomes growing deeper.With the increase of Chinese fir density,rhizomes number in the depth of 0～20?cm soil layer decreased and which in both 20～40?cm and over 40?cm soil layer increased obviously.