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| Effects of hydrological connectivity on phytoplankton community in Baiyangdian Basin， China |
| Received:November 19, 2020 |
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| KeyWord:hydrological connectivity;phytoplankton communities;redundancy analysis;Baiyangdian Basin |
| Author Name | Affiliation | E-mail | | TIAN Yiyuan | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | YANG Wei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | yangwei@bnu.edu.cn | | LIU Qiang | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | WANG Xuan | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | ZHAO Yanwei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| This study aimed to determine the effects of hydrological connectivity and identify the key factors affecting the phytoplankton community in the Baiyangdian Basin. Based on the dams' distribution, the longitudinal connectivity index（LoC） of the rivers were calculated using the reciprocal of the number of dams in each 100 km riverway. Furthermore, the study surveyed the phytoplankton community based on a field survey conducted from June 27th to July 4th 2019. The study performed non-metric multidimensional scaling （NMDS） and redundancy analysis（RDA） to determine the phytoplankton's spatial distribution and the key factors affecting the phytoplankton community in the Baiyangdian Basin. The results showed that the highest LoC index was in the Wangkuai upstream rivers （0.84）, and the lowest were in the Fu, Baigouyin, and Xiaoyi Rivers（0.06~0.08）. The NMDS analysis results showed that the basin could be divided into three regions： reservoirs' upstream rivers, midstream rivers, and Baiyangdian Lake. The key environmental factors affecting the dominant phytoplankton species among the three regions differed based on the RDA analysis. The dominant phytoplankton species in the reservoirs' upstream rivers were affected by COD, TP, and flow rate; by COD, TN, and flow rate in midstream rivers; and by DO, TP, and COD in Baiyangdian Lake. |
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