The Community Structure, Partial Environmental Factors Of Xianren Cave And Guaiwan Cave In Xichou, Yunnan

Xianren cave and Guaiwan cave in Xichou of Yunnan were studied in June and December 2006, including their community structures, the correlation of partial environmental factors with community and its change.1502 samples collected; Xianren dong had 3 phyla 6 classes 11 orders 22 families 39 genera 100 species,1018 samples; Guaiwan cave 3 phyla 6 classes 10 orders 14 families 12 genera 16 species, 484 samples.The community structure of cave animal in Xianren cave shows obviously variety:species,summer's>winter's.H'(Entropy),J(Evenness),C(Concentration),D(Richness)of community structrure shows evidently zonal distribution seasonally too.After soft's analyzing,the major factors to determine community constructure are Ca and organic matter in water,its reliability was examined.The animal's species,entropy,and richness are affected by Ca in water,its trend is that the more Ca,the more species and the complicated in some way.The organic matter in water more influence to community structure too,sometimes its ups can add animal kinds and high community structure,about concentration,it against them.This supports the options of species upping to high diversity indexes ,to down dominant species'trend that entropy and concentration were calculated by the formulas to value community diversity simply.From the tab of correlation analysis, highly positive correlation between H'(Entropy) and Ca in water, D(Richness)too; significantly negative correlation between C(Concentration) and Ca in water, species significantly positive correlation to organic matter in water, H'(Entropy), D(Richness) positive too;C(concentration) highly negative correlation with organic material .Their reliabilities have been tested properly. From similarity analyzing, the highest index is in community A2-B2(0.5372), the lowest A2-E1 (0), maybe the similarity index be correlated by Ca and organic matter in cave water.Community's change tells that the studied caves'climaxes are finished in summer. The community structure is different in own area.No identical communities absolutetly in the world, any community has its nature in space and time. The paper surports polyclimax theory .