摘要：Biodiversity changes caused by anthropogenic disturbance through foliage removal (lopping) were studied in Quercus semecarpifolia Sm. (oak) dominated forests in Nepal. We studied the locations of Phulchoki (Kathmandu Valley) and Ghorepani (Annapurna Region). Alpha (α) diversity, gamma (γ) diversity and different estimates of beta (β) diversity of vascular plant species were estimated in six disturbance classes characterized on the basis of lopping intensity. The effects of different levels of anthropogenic pressure on the diversity measures were analyzed by examining how β-diversity corresponds with the pattern of α-diversity. Alpha (α)- and γ-diversities show a unimodal response to disturbance gradient, but β-diversities do not follow a consistent pattern. However, the linear relationships between beta diversities (βSD and βA) and the disturbance gradient indicate that all kinds of plant species diversity measures increase up to the level where forest disturbance is intermediate. Hence, we suggest the adoption of prescribed forest utilization systems as a management policy. Such a policy has two advantages: on the one hand, it contributes to sustainable livelihoods of the people depending on local forest resources, and on the other hand, it contributes to conservation of plant species diversity.
关键词：anthropogenic disturbance;conservation;Middle Hills;plant species diversity;Quercus semecarpifolia;forest;Nepal
