闽北山地坡位对闽楠生长和林下植被丰富度的影响

Effect of Slope Position on Growth and Understory Plant Richness of Phoebe bournei Plantation on Northern Fujian Mountain Land

为揭示坡位对闽楠人工林生长和林下植被丰富度的影响,选择闽北山地不同坡位的闽楠人工林为研究对象,对其保存率、胸径、树高、单株材积、林分蓄积量、生物量以及林下植被种类和数量组成进行了调查。结果表明:坡位显著影响了闽楠人工林的生长和林下植被组成,不同坡位上闽楠人工林平均胸径、平均树高和林分蓄积量均为下坡位大于上坡位,不同器官生物量除细根的生物量为下坡位与上坡位无显著差异之外,其他器官的生物量均为下坡位>上坡位,下坡位闽楠人工林林下植被的数量和种类组成均大于上坡位,在选择闽楠造林地时,应尽量选择下坡造林,不宜选择上坡造林。

To reveal the effect of slope position on growth and understory plant richness of Phoebe bournei plantation,Phoebe bournei plantations at different slope position of northern Fujian mountain land were chosen,and the survival rate,DBH,tree height,individual volume,stand volume,biomass and the understory plant richness were investigated.Result shows that slope position significantly affect the growth understory plant composition;the mean DBH,mean tree height and stand volume are all higher on downhill position than on uphill position,except for the fine roots which show no significant difference between downhill and uphill position,the biomass of different organs are all higher on downhill position than on uphill position too,in addition,the number and species composition understory are also greater on downhill position than on uphill position,so downhill position is preferred when afforest with Phoebe bournei.