RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (12): 2047-2053.doi: 10.11870/cjlyzyyhj201512007

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EXPLORATION OF SURFACE SEDIMENT DIATOM IN DRAGON LAKE

LU Ya-ping, YAO Min   

  1. School of Environment and Planning, Liaocheng University, Liaocheng 252059, China
  • Received:2015-03-31 Revised:2015-06-15 Online:2015-12-20

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Abstract: In this study, we took the middle and lower reaches of the Yangtze river typical grass type lake dragon lake as the research object, used biological index (surface layer sediment diatom), through the analysis of the diatoms, DCA analysis, clustering analysis and the lake nutrient characteristics analysis of diatom species, to explore the classification of dragon lake sediment surface diatom species, the potential environmental gradient of influencing diatom, the space distribution features of surface sediment diatom taxa, and analyzed the lake nutrient characteristics which surface sediment diatom taxa instruct. Research shows that dragon lake surface sediment diatom taxa had space differences in distribution. Surface of diatom taxa distribution was mainly explained by the first axis of environmental factors, reflecting the arrangement of the sample under the control of the first axis. The environmental significance reflected by the second axis was not significant. Rich nutrition of phytoplankton species was dominant species in dragon lake diatom combination. Dragon lake is close to eutrophic state. Half planktonic species Aulancoseira granulate is the biggest dominant species, and Aulancoseira granulate has absolute advantage in moderate nutrition lake. Floating and half floating kind of Cyclotella atoms and C. eneghiniana, Aulacoseita alpigea, Cyclostephanos dubius, Stephanodiscus parvus, S. hantzschii, which are eutrophication phytoplankton species that mainly occur in eutrophic lakes and can better indicate eutrophication appeared in Dragon lake. Phytoplankton species as the dominant species of east lake area than pick benthic species as the dominant species of west lake area in lake eutrophication is more serious. This study is looking forward to providing theoretical basis to the governance in the lakes wetlands.

Key words: dragon lake, surface layer sediment diatom, analysis of diatom, DCA analysis, nutritional characteristics

CLC Number: 

  • X832
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