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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (5): 229-237.DOI: 10.7522/j.issn.1000-694X.2021.00087

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Evolution trend of phytoplankton community structure in Gansu section of Heihe River

Yaling Sun1(), Xiaoyu Niu1(), Jinqi Liu1,2, Huan Wang3   

  1. 1.Gansu Province Water Environmental Monitoring Center,Lanzhou 730000,China
    2.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.Nanjing Hydraulic Research Institute,Nanjing 210029,China
  • Received:2021-06-15 Revised:2021-07-09 Online:2021-09-20 Published:2021-09-23
  • Contact: Xiaoyu Niu

Abstract:

In order to investigate the temporal and spatial evolution of the aquatic ecosystem in northwest inland river basin, phytoplankton of Gansu section of Heihe River was investigated in July 2017. And phytoplankton datas in 1981, 1997 and 2008 were collected to analyze the evolutionary characteristics of phytoplankton species, biodiversity and dominant species in the upstream, midstream and downstream of the Heihe River at different periods. At the same time, Bioactivity index was proposed to characterize the activity of river organisms. The results showed that the midstream of Heihe River has the most abundant and stable phytoplankton community structure in each year, and its species (61 genera), biodiversity (2.87), and bioactivity index (0.194 million cells·hm-2) were higher than those of upstream and downstream. On the time scale, the upstream phytoplankton community continued to be abundant. The midstream continued to decline from 1981 to 2008, and then quickly reversed to a richer and more active level in 2017. The downstream showed a continuous decline. Based on 1981, the water area of midstream of Heihe River decreased by 5.2%, and phytoplankton biological activity decreased by 16.5% in 2010. Water area increased by 1.2%, and phytoplankton biological activity increased by 4.3% in 2017. Phytoplankton in Heihe River basin has strong sensitivity and dependence on changes in its natural wetlands and waters. The evolution of phytoplankton community structure was consistent with the change of wetland water area.

Key words: inland river, phytoplankton, community evolution, bioactivity index

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