RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (05): 730-737.doi: 10.11870/cjlyzyyhj201705010

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EFFECT OF WATER LEVEL ELEVATION ON SOIL MICROBIAL METABOLIC FUNCTION OF WETLANDS——A CASE STUDY OF BANG LAKE

LI Jin-qian1,2, WANG Ji1, LIU Ya-jun1,2, ZOU Feng1,2, MA Yan-tian1,2, WU Lan1,2   

  1. 1. School of Life Science, Nanchang University, Nanchang 330031, China;
    2. Key Laboratory of Molecular Biology and Genetic Engineering in Jiangxi Province, Nanchang 330031, China
  • Received:2016-08-22 Revised:2016-11-24 Online:2017-05-20
  • Supported by:
    National Natural Science Fundation of China (31360127, 31260110)

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Abstract: In freshwater lake ecosystems, change of water level will markedly affect the whole ecosystem. The Bang Lake, which is one of the most representative sub-lakes of Poyang Lake, was selected as study field in this study. Along with the gradient of water level elevation and vegetation succession, 6 sample plots were set up, and the diversity and distribution of microbial metabolic function from different plots were studied by using the Biolog-Eco method. Our results indicated that with the decrease of water level elevation, soil moisture was gradually increased, while vegetation coverage rate was gradually reduced. Soil organic matter content decreased firstly but increased afterwards. The soil microbial metabolic activity of carbon source was reduced as the water level elevated, and the preference and utilization rates of carbon source types were significantly different. Further results from distance-based redundancy analysis (dbRDA) showed that the carbon metabolic pattern of soil microbial communities from adjacent plots were more similar. There were several factors affecting the soil microbial metabolism of carbon source, including soil moisture, soil organic matter, pH, NH4-N and vegetation types. These findings would provide scientific guidance for reasonable management and protection of Poyang Lake wetland ecosystems.

Key words: Poyang Lake, water level elevation, microbial community, Biolog-ECO, soil properties

CLC Number: 

  • S154
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