黑石顶自然保护区南亚热带常绿阔叶林生物量与生产量研究——Ⅱ.马尾松生长分析

Studies on Biomass and Production of the Subtropical Evergreen Broad-leaved Forest in Heishiding Nature Reserve Ⅱ.Growth Analysis of Pinus massoniana Lamb

以生长分析及树干解析法,分析了黑石顶自然保护区马尾松(Pinus massonianaLamb)种群从幼苗幼树至成熟个体的生长特点及规律.①总生物量的增长从幼苗期开始便呈幂函数增长,直至整个生长旺盛期.②最初几年的幼苗,具较高的叶生物量和较低的根生物量(分别占总生物量的30%～60%和20%以下,最低仅6%～7%).和径向生长相比.幼苗高生长较快.③自然生长的2、3年生幼苗的相对生长率分别为3.499×10^(-2)和6.618×10^(-2)g/g·week),净同化率分别为6.310×10^(-2)和0.227(g/g·week).

This paper dealt with the growth of the seedlings,saplings and matureindividuals of Pinus massoniana Lamb.in Heishiding Nature Reserve.1.Biomass increased with age in a power way from seedling stage,which la-sted through the fastest growth period.The fastest growth period lied in 20～40years,and mature stage,in 60～70 years,which was not complete same for gro-wth of height,diameter,and volume.2.The very young seedlings had a remarkable leaf diomass(30%～60% oftotal biomass),a relatively low root biomass(20%,with the lowest value of 6%～7%),and a rather sound speed of growth in height,3.The values of relative growth rate of 2 and 3 years' seedlings were respec-tively 3.499×10^(-2) and 6.618×10^(-2)(g/g·week),and that of net assimilation rate6.310×10^(-2) and 0.227(g/g leaf·week).