Journal of Guangxi Normal University(Natural Science Edition) ›› 2018, Vol. 36 ›› Issue (1): 132-141.doi: 10.16088/j.issn.1001-6600.2018.01.020

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Benthic Diatom Assemblages Distribution in Longjiang and Diaojiang Rivers, in Relation to Chemical and Physiographical Factor

ZHANG Haoran1,CAI Desuo1*, LIN Jincheng2,SHENG Wei1,HUANG Kun1   

  1. 1.College of Hydraulic & Environmental Engineering,China Three Gorges University,Yichang Hubei 443002,China;
    2.Power-China Guiyang Engineering Corporation Limited,Guiyang Guizhou 550081,China
  • Received:2017-06-25 Online:2018-01-20 Published:2018-07-17

Abstract: In order to study the main influencing factors of benthic diatom community structure in Longjiang and Diaojiang rivers, the diatom samples of 32 sites were collected and 11 physicochemical indexes in the Longjiang and Diaojiang rivers were recorded. All were processed in the laboratory and the diatom species were identified using optical microscope. 179 diatom species were found in the two rivers, which belong to 33 genus. Among them, 141 diatom species belonging to 30 genus were found in Longjiang river, and 138 species from 24 genus were identified in Diaojiang river. CCA showed that the diatoms in the two rivers are affected by the interaction of physicochemical and geographic factors. The first four axis cumulative explained the relationship between species-environment in 60.5%. The first two ordination axes altogether explained the 36% of the diatom-environmental variables. The correlation coefficients between the distributions of species and the ordination axis were 0.948 and 0.919. It revealed well the diatom-environmental correlation. The conditional effects of each environment variable were tested and Monte carlo displacement inspection was also completed. It showed that the pH value, conductivity, total phosphorus, altitude, water temperature and flow rate were the main factors affecting the structure of the diatom community in the river area.

Key words: Longjiang river, Diaojiang river;benthic diatoms, environmental factors

CLC Number: 

  • X835
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