The species and distribution of the water vascular plants at the Han river basin in Hanzhong,Shaanxi Province The analysis of Chinese endemic genera of seed plants in Hanzhong area of Shaanxi Province Determination of resveratrol glucoside and resveratrol in radix and rhizome of Polygonum cuspidatum yielded in Hanzhong Region Studies on the Ecological Environments and Adaptability of Introduction of Olive Tree in Hanzhong