不同强度人为干扰对香格里拉亚高山森林树种结构的影响

人为干扰对森林生态系统有着重要影响。以云南省香格里拉县尼西乡汤堆中村集体林为研究对象,采用样方调查法,研究不同强度人为干扰对香格里拉亚高山森林生态系统树种组成、重要值及群落结构的影响。结果表明,人为干扰能在一定程度上增加香格里拉亚高山森林树种多样性,但随着人为干扰强度的增加,其树种多样性又逐渐降低,群落出现断层,森林资源量减少,进而发生逆行演替,危害了森林生态系统的良性循环。建议根据当地实际,有计划地发展用材林、经济林和薪炭林,减少对森林资源的依赖,以有效保护和恢复森林植被。

Community Structure of Urban Forest and Disposition Characteristics of Trees in Hefei Ring Park

Themethods of vegetation ecology were used to analyze the community structure of Hefei Ring Park, andspecies composition, distribution patternoftree heightand DBH weredescribed.Through calculation of tree growth index and association correlation of component species, the community structures were analyzed. The results showed that community structures are complex, there are 22 pairs of species with positive association, and tree individual in the following communities grow well and are more stable, the majorarePlatycladus orientalis-Prunuscerasifera f.atropurpurea-Osmanthusfragrans, Robinia pseduacacia- Ligustrum lucidum,Robinia pseudoacacia-Ginkgobiloba-Photinia serrulata,Populuscadadensis-Ligustrum lucidum-Osmanthusfragrans, Sophora japonica-Ligustrum lucidum-Buxussinica, Cyclobalanopsis glauca- Distylium racemosum.