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Study On Ecology Of The Wetland Vegetation At Lanzhou Section Of The Yellow River

Posted on:2008-06-14Degree:MasterType:Thesis
Country:ChinaCandidate:Y ZhangFull Text:PDF
GTID:2120360215968197Subject:Botany
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Based on data of typical plots, the life form, ecotype, species diversity, niche of constructive species of wetland vegetation at Lanzhou section of the Yellow River, was studied by use clustering analysis. Through specimen gathering, the spermatophyte section and the distribution area of genera of the wetlands in Lanzhou city along the Yellow River is statistically analysised. Then try to know the114 species type and floristic geography composition of the wetland vegetation. The results show that:(1)There are 142 fibber canal plants in wetland plant along the Yellow River, in which there are 141 spermatophytes, belonging to 32 families and 85 genera; there is also a kind of fern. Among those, the genera of Graminiae,Compositae,and Chenopodiaceae take up high percentage, share to 24.70%,20% and 14.11 %of the total amount.(2)According to the classification system of life-form provided by Raunkiae, in the research area, phanerophytes accounts for 15.61%, chamaephytes accounts for 31.91%, hemicryptophyte accounts for 4.26%, cryptophytes accounts for 1.42%, and therophyte accounts for 17.02%. That shows Chamaephytes is the most successful life style to adapt to the temperate continental climate in Lanzhou city.(3)As water to be a dominant ecological factor, there are 52 kinds of mesophyte which is the most, accounting for 56.25% of the total and 23 Hygrotaxis mesophytas and Hygrophyte, accounting for 23.96%.These plants are primarily composition of the wetland vegetation at Lanzhou section of the Yellow River.(4)According to the section type of Chinese spermatophyte compartmentalized by Wu zheng yi, the spermatophyte at Lanzhou section of the Yellow River is divided into 15 distributed types. There is 25 world genera, accounting for 29.4% of the total. 11 Tropics genera, accounting for 12.94% of the total. 74 Temperate zone genera account for 87.06%. The results show that: plant section of Lanzhou along the Yellow River belongs to the temperate zone nature.(5)Adopt to the division of wetland vegetation classify system, Wetland vegetation at Lanzhou section of the Yellow River is divided into 17 associations. Including 2 woody associations and 15 herbaceous associations. There are Ass.Salix matsudana., Ass.Tamarixchinensis, Ass.Phragmites Assmmunis, Ass.Agropyron cristatum, Ass.Suaeda glauca, Ass.Typha minima, Ass.Echinochloac rusgalli, Ass.Calamagrostis pseudophragmites, Ass. Cynanchum chinense, Ass.Phragmites commmunis, Ass.Lepidium apetalum, Ass. Polygonum lapathifolium,Ass.Kochia scoparia, Ass.Lepidium latifolium, Ass.Chenopodium glaucum, Ass.Scripus triqueter Ass.Potentilla anserine.(6)Using Shannon-Wiener index to analysis, the arranges of community biodiversity of wetland vegetation in Lanzhou section of the Yellow River, from infancy to maturity in turn are: Ass.Agropyron cristatum
Keywords/Search Tags:wetland, vegetation classification, life form, ecotype, species diversity, Lanzhou
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