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Quantitative Assessment on Endangerment Degree of Rare Animal and Plant Species in Tibet,China 被引量:5
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作者 DONG Ke ZHONG Xianghao LIU Shuzhen 《Wuhan University Journal of Natural Sciences》 CAS 2007年第4期684-688,共5页
It is of profound theoretical and practical significance to study endangerment status of rare species in Tibet. Index system is firstly set down for quantitative assessment of rare animal and plant species, then endan... It is of profound theoretical and practical significance to study endangerment status of rare species in Tibet. Index system is firstly set down for quantitative assessment of rare animal and plant species, then endangerment degree of wildlife under special state protection are calculated, which is expressed by value E. The results reveal that Yunnan snub-nosed monkey (Rhinopithecus bieti), Himalayan tahr (Hemitragus jemlahicus) and Gigantic Cypress (Cupressus gigantea) have the highest E respectively in animals and plants. According to value E, all species are categorized into 4 ranks: critically endangered(0.6-0.8), endangered (0.4- 0.6), vulnerable (0.2-0.4) and lower risk ( E ≤ 0.2). By comparison of the first five animals and plants of the highest E, each sub-ecozone bears a distinct identity. 展开更多
关键词 endangerment degree ENDEMISM specific type endangerment rank
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Suitable Size of Nature Reserves in Tibet,P.R.China Based on Endangerment Degree of Species
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作者 DONG Ke LIU Shuzhen +1 位作者 ZHONG Xianghao ZHU Wanze 《Chinese Forestry Science and Technology》 2012年第Z1期39-53,共15页
In a view of natural conditions of establishing nature reserve,an index system was prepared for quantitative assessment on status of endangered species,and thus degree of endangered species in Tibet was evaluated.Taki... In a view of natural conditions of establishing nature reserve,an index system was prepared for quantitative assessment on status of endangered species,and thus degree of endangered species in Tibet was evaluated.Taking a sub-ecozone as basic unit,top 5 animals and 1 plant with high E as well as the number of species in each unit were enumerated;and the degree of land utilization was figured out.Afterward,we selected 6 coefficients,assigned weight,and framed formula to reckon proportion of nature reserve,thus an area of nature reserve in each sub-ecozone was obtained.In 5 schemes of weight assignment,a scheme with medium area of nature reserve was selected.All sub-ecozones were classified into 4 grades prior conservation,1 was in grade A,2 in grade B,2 in grade C,and 11 in grade D.Total planned area was approximately 365 135 km2,about 48 834 km2 smaller than the actual area of 413 969 km2,ratio of nature reserve in Tibet diminishes from 34.4% to 30.38%.Based on 3 factors of human disturbance,ratio of buffer-experimental zone in proposed nature reserve was calculated.It was demonstrated that existing size of nature reserves is excessive on the whole,and their distribution is not reasonable entirely.The size of nature reserves in 3 sub-ecozones of northern Changtang should decrease,and decrement of area is apportioned among other 13 sub-ecozones which should increase nature reserve.Heterogeneity of regional distribution of rare species in Tibet is quite obvious,so proposed area distribution of nature reserves is more scattered than the existing. 展开更多
关键词 endangerment degree sub-ecozone land utilization nature reserve CONSERVATION TIBET P.R.China
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