RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2021, Vol. 30 >> Issue (6): 1437-1444.doi: 10.11870/cjlyzyyhj202106017

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Influence of Multi-Scale Environmental Factors on Stream Benthic Algae Community in Xiangxi Watershed of Shennongjia

YANG Shun-yi 1,2, LI Yang1,2, WANG Xu2, YE Lin1, TANG Tao1, CAI Qing-hua1   

  1. （1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;
    2. Central Station of Environmental Monitoring, Changjiang River Administration of Affaris , Wuhan 430019, China）
  • Online:2021-06-20 Published:2021-06-30

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Abstract: Compared with single-scale environmental factors, multi-scale environmental factors have a more comprehensive description of spatial distribution of aquatic life in the watershed. In Xiangxi watershed, altitude, land-use, water quality and hydrological fators were selected, and the Trophic Diatom Index (TDI), species richness and community composition were decomposed by Variation partitioning analysis in different seasons, using partial Redundancy Analysis and partial Canonical Correspondence Analysis to analyze the influence of large and small-scale environmental factors on the spatial distribution of benthic algae, respectively. The results showed that: (1) TDI is mainly influenced by small-scale environmental factors with 100% interpretation and no interaction; (2) Richness is influenced by large-scale and small-scale environmental factors respectively in different seasons with 100% interpretation and no interaction; (3) benthic algae composition is mainly influenced by altitude and altitude has an interaction with NO3-N at 43%. While the results show that more small-scale environmental factors have an impact on benthic algae, the impact of large-scale environmental factors on benthic algae distribution is long-term and stable in the watershed.

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