广东黑石顶南亚热带常绿阔叶林树木生长研究(英文)

GROWTH OF THE TREES AND SAPLINGS IN THE LOWER SUBTROPICAL EVERGREEN BROAD LEAVED FOREST IN HEISHIDING,GUANGDONG PROVINCE

用测树器和年轮解析法 ,测定了广东黑石顶南亚热带常绿阔叶林的立木和幼树的径向生长和高生长。年轮解析法测得立木的年直径生长量在 0 .1～ 0 .5cm之间 ,一些立木的直径生长呈现出生长快的年份 ( 1～ 3a)和生长慢的年份 ( 1～ 3a)交替的节律。测树器测得立木 5a的年平均直径生长量为0 .0 74cm,5年期间测得有 1 7.6%的个体直径为零增长或负增长。立木的年高增长量为 1 0～ 50 cm,高生长高峰期通常在 1 0～ 30年龄。在树木生长的早期 ,高度的生长优于直径的生长 ,而在树木生长的中、后期 ,直径的生长逐渐优于高度的生长。用游标卡尺和卷尺测得幼树 (通常 1～ 3m高 )的直径和高度 5a的平均生长量分别为 0 .1 0 7cm和 4.76cm。 5a间没有幼树的直径生长为零增长或负增长 ,但约有 9%的个体的高度生长为零增长或负增长。

Growth in diameter and in height of the trees in the lower subtropical evergreen broad leaved forest in Heishiding,Guangdong Province,China,was studied using growth ring analysis and dendrometers.Annual diameter growth ranged about 0.1~0.5cm,differing among species and individuals.Diameter growth of some trees seemed to present a wavy rhythm of fast growing year(s)(1~3 years) and slow growing year(s)(1~3 years).Dendrometer measurement showed a mean annual diameter growth of 0.074cm(increment percentage 0.57%) in a 5 year period,with 17.6% of the individuals measured with dendrometers presenting zero or negative growth during this period.Annual height growth was measured about 10~50cm.Peak height growth occurred usually at 10~30 years.In the early stage of the tree growth,height growth prevailed over diameter growth,and the reverse was found later on.The diameter and height growth of the saplings(height 1~3m usually),measured with both vernier callipers and steel tape during a 5 year period,were 0.107cm and 4.76cm,respectively.No saplings showed zero or negative growth in diameter in the 5 year period,but about 9% of the individuals measured showed zero or negative growth in height.