洮河林区云冷杉林分类型多样性及稳定性研究

利用洮河林区云冷杉林择伐周期研究和森林资源二类清查样地资料,对该林区云冷杉林分类型多样性和林分的稳定性进行了研究。结果表明:该林区的林分类型多样性随郁闭度的降低而增加,林分的稳定性随多样性的增加而降低,林分处于逆向演替过程中,林分的稳定性处于最低限。云冷杉林与环境因子-海拔之间呈明显的负相关。在高海拔区云冷杉林十分脆弱,一旦原有种群的郁闭度低于0.3,森林的稳定性将被破坏,既使在完全封禁的条件下,25年生的疏林要恢复到有林地状态将需要40年的时间。

Study on diversity and stability of stand types of Picea-abies forests in Taohe forest region

The stability and diversity of stand types of Picea-abies forests in Taohe forest region were analyzed based on the research of cutting cycle and the data of sample plots of the 2dr forest property inventory in the forest region .The results showed as follows: The diversity of stand types increased with the declaration of degree of closing, and the stability of stand types decreased with the increasing of the diversity; Secondly, stand type kept the lowest stability, when it was be on the degenerated succession. There are obvious negative relationship between the stability of stand types and the environmental factorelevation. Thirdly, Picea-abies forests on the high elevation are very fragile, and the stability would be destroyed as soon as the degree of closing of original populations is less than 0.3. Even if it is in the entirely enclosed environment, it would take 40 years to restore one of open forest lands aged 25 years to forest land.