The Study Of The Species Diversity Of Seed Plants In The Karakorum Mountains Of China

The Karakoram Mountains located in the southern Kunlun Mountains.The relatively poor natural conditions, sparsely populated, less damaged by the outside world, it is essential to maintain the plateau ecosystem original state.A variety of communities,vegetation types and rich plant species resource there.About 47 families,205 genera,659 species,4 subspecies,19 variaties of Seed Plants are recorded to occur in Karakorum Mountains of China,repectively accounting for 26.40% of families,14.37% of genera and 7.30% of species in Qinghai-Tibeta.Among them,there are 2 new genera,72 new species,5 new varieties on the Karakorum Mountains of China,and 1 new genera,19 new species in Xinjiang,9 new species,1 new variety in Tibet.The composition of families about the seed plants in the area, both in the genus or species level, the middle family and more genera (species) family are constitute the main body of the structure, both the proportion is 68.78%,86.50%.One species genera and little species genera occupy 82.92% of the total species which composed the main part of the genera on genera level.But the more species genera occupies 55.69% of the total species which composed the main part of the genera on species level.11 species and 1 variaties are endemic to Karakoram Mountains of China,15 species and 1 variaties are endemic to Xinjiang,2 species are endemic to Tibet,34 species and 2 variaties are endemic to China, 2 genera only distribute in Xinjiang in China,5 species only distribute in Karakoram Mountains of China, 136 species and 1 variaty only distribute in Xinjiang in China,9 species only distribute in Tibet,These species account for 32.18%.The composition of flora are very complex in the Karakoram Mountains of China,which belong to 10 areal-types and 15 subtypes.The temperate quality are obvious and the North temperate accounts for 73.48%.Meanwhile,most interflows between the flora in this area with that in the Mediterranean,Western Asian and Central Asian,and few ones with Eastern Asian flora and tropic distribution have been found.Comperaed with the peripheral regions,the similarity coefficient of the Pamirs of China and the Karakoram Mountains of China is the highest,respectively accounting for 77.97%,58.57%,38.22%on the level of families,genera and species.In the plant life-form,the proportion of hemicryptophyte is as high as 75.11%.Seed plants resources are rich in the area,many species have important value in medicine,admiring feeding,viewing,olein,sand-fixing and soil conservation and so on. The article provided basic science information for lucubrating how to protect biology diversity and utilize plant resource in the Karakorum mountains of China.