The altitudinal pattern of insect species richness in the Three Gorge Reservoir Region of the Yangtze River: effects of land cover, climate and sampling effort A PRELIMINARY STUDY ON THE DESIGN OF A COMMUNITY FOR EX SITU CONSERVATION OF THE RARE AND ENDANGERED PLANTS IN THE THREE GORGE RESERVOIR AREA New Record of Two Endangered Plants in the Inundation Zone of the Three Gorge Reservoir Area