Abstract: Disturbance from human-kind has been one of the major causes to the loss of biodiversity . In the watershed of Mengnai River within the Tongbiguan Nature Reserve of Yunnan Province , we applied Geographic Information System and
Remote Sensing techniques to analyze the impact of cascading hydropower development on landscape diversity , and impact on major protected objects including Dipterocarp forest , rare and endangered plants and animals existing in the nature reserve. Results showed that the development of cascading hydropower stations would slightly increase the fragmentation of the whole landscape in the watershed of Mengnai River , alter the landscape diversity to some extent . However , the impact of cascading hydropower development on the Dipterocarp forest and the rare and endangered plants and animals should not be neglected . Especially, road construction in the area would bring a more significant effect upon forest . Forest cover would decrease by 5. 83% with a potential loss of 1 472 .09 hm2 , 69 . 1 hm2 of Dipterocarp forest would be affected to some extent . In order to mitigate the impact of the hydropower development project on biodiversity , proper measures on 5 aspects were
recommended based on this study .

Key words: Tongbiguan Nature Reserve

摘要： 综合运用地理信息系统(GIS) 和遥感(RS) 技术, 分析了勐乃河梯级电站建设对流域内景观多样
性、流域内铜壁关自然保护区( 昔马片) 的主要保护植被类型—龙脑香林和保护区内的珍稀濒危动植物造成的影响。结果表明, 梯级电站的建设, 将会加剧勐乃河流域景观的破碎化程度, 改变流域的景观多样性, 但对景观层次影响不大; 而工程建设对保护区内的龙脑香林和珍稀濒危动植物的影响却不容忽视, 尤其是道路的建设, 将导致流域内森林覆盖率下降5 . 83% , 森林面积减少1 472. 09 hm2 , 其中69 .1 hm2 的龙脑香林受到不同程度的影响。为了最大限度地降低工程建设对生物多样性造成的影响, 针对本项工程的特点, 文章从五个方面提出了相应的建议和措施。

关键词: 勐乃河, 铜壁关自然保护区, 景观多样性, 龙脑香林, 保护对象