Diversity of Seed Plants in the Middle Part of Southern Slope of Qingling Mountains

The region locating in the middle part of southern slope o f Qingling Mountains has been attracted close attention for giant panda and forest ecosystem and is one of the regions rich in species. There are about 2148 species se ed plants belonging to 815 genera in 155 families accounting for 63.32% in total species, 80.69% in total genera and 96.27% in total families of seed plants including 7 families, 18 genera and 33 species of gymnosperms, 24 families, 170 genera and 391 species of monocotyleden, 124 families, 627 genera and 1760 species of dicotyleden. 31 rare or endangered plant species and 34 genera Chinese endemic genera were found growing in the area. There are 15 distribution types and 21 subtypes of genera of seed plants in the region, including 30.66% of subtropical elements and 64.79% of various temperate distribution type. 3 families contain more than 1 00 species of plants, 7 families 50～100 species, 44 families 5～2 species and 3 4 families only one species. The diversity of the species, life form and distribution type of genera of seed plants and some of the major problems existing in this region were analyzed. The countermeasures for the future biodiversity protection and sustainable development in this region were then proposed.