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Study On The Flora Of Seed Plants In Tongdao Dongzu Self-government County Of Hunan Province

Posted on:2006-02-03Degree:MasterType:Thesis
Country:ChinaCandidate:W X HuangFull Text:PDF
GTID:2120360155956748Subject:Botany
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This paper studied the floristic structure of families, generas and species, as well as features of Tongdao seed plants flora and relation with its neighboring regions. The intensive analysis to Tongdao floristic peculiarity were given at different levels, such as familiar, generic, and specific respectively. The status and the related geographic problems of the flora at Chinese flora were discussed, and gained valuable harvest.1. There are 173 families, 715 genera and 1728 species (include lower unit ) are recorded totally in Tondao county, there are 8 families , 13 generas and 19 species in gymnosperms, 165 families, 702 generas and 1709 species in angiospermae. There are 22 larger or especial lager families (they include 52.43% of the total species), the principal part of Tongdao flora is constituted by them.2. The basic composing of Tongdao seed flora is that: 173 families in this flora can be classified to 11 areal-types, among them, 78 families are tropic character (62.90% of the total families), 46 families are temperate character (37.10% of the total families). 715 generas in this flora can be grouped into 14 areal-types, among them, the four areal-types which accounting for larger proportion are Pantropic, Trop. Asia, North temperate and E. Asia & N. Amer. disjuncted (they include 327 generas, 49. 55% of the total generas), this indicate the tight relation between Tondao and the four types. In the ingredient of generas, there are 349 generas belong to tropic character (52. 88% of the total generas) and 311 generas belong to temperate character (47. 12% of the total generas ). 1728 species in the flora can be grouped into 14 areal-types, among them, the Endemic to China with 770 species is at the first position (45.11% of the total species).3. The floristic character of seed plants in Tongdao is that: according to the quantitative analysis of the families, generas...
Keywords/Search Tags:Seed plant, Flora, Floristic element, Floristic character, Tongdao county of hunan province
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