论文部分内容阅读
对广西大明山退化生态系统植物生长研究表明 :不同恢复阶段立木的直径生长量比较接近 ,平均值变化在 0 .2 4～ 0 .37cm/年之间 ,不同个体间差异明显 ;不同恢复阶段的群落中 ,立木的生长特点不同 ,采伐迹地在林木创伤得到一定恢复后 ,出现较明显的生长恢复 ,而其它恢复阶段的立木不存在此种生长变化 ;在退化生态系统中普遍存在着零增长和负增长个体 ,其中 ,2年恢复期的群落中零增长和负增长个体分别占 19.4 8%和 11.92 % ,2 0年恢复期分别为 2 4 .35%和2 3.58% ,50年恢复期分别为 2 7.2 2 %和 9.4 9%。
The study on the plant growth of degraded ecosystems in Daming Mountain of Guangxi showed that the diameter growth of stand trees was similar at different recovery stages with the mean value varying from 0.24 to 0.37 cm / year, with significant differences among different individuals. In different recovery stages In the community, the growth characteristics of standing wood are different. After the wood trawl has been recovered, the obvious growth recovery appears in the cutting sites, while the standing wood does not have such growth changes in other recovery stages. There is a common occurrence of zero growth and negative growth in degraded ecosystems Individuals with zero growth and negative growth accounted for 19.4% and 11.92% of the population in the two-year recovery period, respectively, with a recovery period of 20.45% and 23.58% respectively in the two-year recovery period and two-year recovery period of 7.222% % And 9.4 9%.