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Study On The Flora Of Dryopteris Adanson Of Hunan, China

Posted on:2015-03-21Degree:MasterType:Thesis
Country:ChinaCandidate:T T DuFull Text:PDF
GTID:2250330428468029Subject:Ecology
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Based on the specimens that collected and diagnosed from Hunan and the literature pubulished about Dryopteris of Hunan, the checklist of Dryopteris in Hunan is given. Studied the floristic structure of species, as well as features of Hunan Dryopteris flora and relation with its neighboring provinces. The status and origin problems of Dryopteris flora are discussed. Summed up following several valuable conclusions.1. Species and distribution:Dryopteris in Hunan is rich. After a field investigation and information gathering to finalize that there are69species and varieties of Dryopteris in Hunan,41.3%of the total species in China,17.3%of the total species in world. Dryopteris mainly distributes in northwest and southwest of Hunan, there are50and51species in two regions, respectively72.5%and74.0%of the total species in Hunan. Dryopteris mainly distributes in Sangzhi, Shimen, Tongdao, Xinning, Wugang and Dongan in Hunan. Vertical distribution of the Dryopteris flora is evident in Hunan. They distribute between50m and1800m alt. But mainly distributed between600m and1200m (51species,74%of the total species in Hunan). Dryopteris in Hunan is rich in endemic species, there are23species (33.3%of the total species) endemic to the China.2. Floristic characters and elements of Dryopteris in Hunan. The total species can be divided into2areal-types(E. Asia and Endemic to china) and2variant (SH and SJ) of15distribution types in Chinese seed plants flora. Endemic to China distribution pattern are the riches (33.3%of the total species). There are17species of E. Asia (24.6%of the total species).14and15species in the areal-types of SH and SJ, respectively20.3%and21.7%of the total species. So Dryopteris in Hunan province has a rich East Asian color, and closely connected with Himalaya and Japan.69species are all temperate character, this shows that floristic characteristic of Dryopteris in Hunan is temperate.3.3. The influence caused by different area covers is decreased by the richness index. The index of Hunan ranks second among the15provinces, followed by Sichuan, Guizhou and other provinces. The result of similarity comparing with neighbor flora of Dryopteris shows that flora of Dryopteris in Hunan is similarest to Guizhou、Guangxi and Hubei, similarer to Sichuan、Zhejiang、Jiangxi and Fujian, and not similarest to Jiangsu、Shanxi and Xizang.Furthermore,the plant of Dryopteris of Hunan richness is so high, highlighting the flora of Dryopteris of Hunan prominence in China.4. A new species, Dryopteris jishouensis G. X. Chen et D. G. Zhang which has been published by life science research are found. The information of Dryopteris flora of china is enriched.
Keywords/Search Tags:Dryopteris, Hunan, Flora, The floristic characteristic, Floristic element
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