Abstract: Qinling Mountainous area is not only a natural boundary of south and north China, but also a significant ecological function section. Based on assessment of the ecological characteristics and ecological function for this area, the main eco-environmental problems were discussed. In order to solve these problems, the following ecological protection methods are suggested: ①Planning a unified way and regionalized rationally; ②building and perfecting environmental protection network; ③developing and managing eco-tourism scientifically;④ exploiting and utilizing natural resources rationally . Finally, main ecological engineering and safeguard measures were brought forward.

Key words: Selenium, Chamaecrista rotundifolia, Growth, Nutrient content, Nitrogen-fixing ability