人为干扰对森林群落及生物多样性的影响

研究了人为干扰对森林群落及生物多样性的影响,结果表明,人为干扰对多样性影响存在差异,干扰强度在3级以上的群落,生物多样性指数下降,且强度越大,多样性指数越低。2级左右的中度干扰,多样性指数增高,符合生态学“中度干扰假说”理论,但完全未受人为干扰的多优种阔叶林多样性指数也高。人为干扰对群落的数量和类型影响明显,在人口聚居区,群落类型少,人为干扰的垂直空间范围在低地河谷为向上200 m的空间范围,在高地缓坡为聚居带向上和向下各100m的空间范围。

Effects of Anthropogenic Disturbance on Forest Community and Biodiversity

Effects of anthropogenic disturbance on forest community and biodiversity were discussed in this paper.The results showed that the effects of anthropogenic disturbance on species diversity were obvious.The diversity index descended when the disturbance index of the communities was above 3 degress,the more strong the disturbance was,the lower diversity index was.With the moderate disturbance of 2 degrees of the community,the diversity index value increased,which accorded with "Intermediate Disturbance Hypothesis" of ecology.But the diversity index of broad-leaved forests of dominant group species is high value.The types and quantity of community along the gradient elevation is obvious because of anthropogenic disturbance.The types of community reduced in population collectivity community.The vertical range of anthropogenic disturbance is 200 m up to river vale in lowland and 100 m up and down to the population collectivity community in highland.