乌江梯级水库碳氮耦合的生物地球化学循环

doi:10.3969/j.issn.1007-2861.2015.01.013

Journal of Shanghai University（Natural Science Edition） ›› 2015, Vol. 21 ›› Issue (03): 294-300.doi: 10.3969/j.issn.1007-2861.2015.01.013

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Carbon and nitrogen coupled biogeochemical cycle in cascade reservoirs of the Wujiang River

WANG Bao-li1, LIU Cong-qiang1, WANG Fu-shun2,Liu Xiao-long3, PENG Xi1, ZHAO Yan-chuang1

1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry,Chinese Academy of Sciences, Guiyang 550002, China;2. School of Environmental and Chemical Engineering, Shanghai University,Shanghai 200444, China;3. Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University, Tianjin 300387, China

Received:2015-04-20 Online:2015-06-22 Published:2015-06-22

Abstract

Abstract: Concentrations of dissolved CO₂ and NO₃⁻ were investigated in cascade reservoirs and related river reaches along the Wujiang River to understand temporal and spatial variations. The average of dissolved CO₂ were (113.6±105.7) μmol·L⁻¹, ranging from 1.6 to 934.6 μmol·L⁻¹. The average of NO₃⁻were (163.0±104.9) μmol·L⁻¹, ranging from 0.4 to 632.0 μmol·L⁻¹. Averages and amplitudes of dissolved CO₂ and NO₃⁻ in the reservoirs are less than those in the rivers. Due to different resources and influencing factors, no significant correlation was found between dissolved CO₂ and NO₃⁻ in rivers. After damming, the activity of phytoplankton was enhanced, and became an important factor controlling material cycle in reservoirs. Photosynthesis and respiration couple C and N biogeochemical cycle, and dissolved CO₂ and NO₃⁻ in reservoirs were significantly correlated. The results indicate that C and N biogeochemical cycles in the original rivers are changed by cascade hydropower exploitation.

Key words: C-N coupling, hydropower exploitation, phytoplankton, respiration, the Wujiang River

CLC Number:

X 142

WANG Bao-Li, LIU Cong-Jiang, WANG Fu-Shun, LIU Xiao-Long, PENG Xi, ZHAO Yan-Chuang. Carbon and nitrogen coupled biogeochemical cycle in cascade reservoirs of the Wujiang River[J]. Journal of Shanghai University（Natural Science Edition）, 2015, 21(03): 294-300.

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Carbon and nitrogen coupled biogeochemical cycle in cascade reservoirs of the Wujiang River

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