RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (11): 1738-1747.doi: 10.11870/cjlyzyyhj2016011013

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RESPONSES OF SOIL MICROORGANISM QUANTITY TO SIMULATED TEMPERATURE ENHANCEMENT IN THE COASTAL PHRAGMITES AUSTRALIS WETLAND

LI Yan1,2, GAO Yan-na1,2, QI Zhi-wei1,2, JIANG Nan1,2, ZHONG Qi-cheng3, JIANG Shan1, WANG Kai-yun1,2, ZHANG Chao1   

  1. 1. School of Ecological Science, East China Normal University, Shanghai 200241, China;
    2. Key Laboratory of Urban Ecology and Restoration, Shanghai 200241, China;
    3. Shanghai Academy of Landscape Architecture Science and Planning, Shanghai 200232, China
  • Received:2016-03-09 Revised:2016-07-19 Online:2016-11-20
  • Supported by:
    Shanghai Municipal Science and Technology Project, "Research on Key Technologies of Monitoring Data Management of Important Ecosystem in Chongming"(11dz1210903);2015 annual open fund of Shanghai Key Laboratory of urban ecological process and ecological restoration (SHUES2015A02);National Natural Science Foundation of China(31500392);State Key Laboratory of estuarine and Coastal Science(SKLECKF201411)

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Abstract: By using the method of open-top growth chambers (OTC) to simulate temperature enhancement for 8 consecutive years(2008-2015), the study studied the response of different soil layers and rhizosphere and non-rhizosphere of Phragmites australis and Imperata cylindrica culturable soil microbial quantity change to long-term simulated temperature enhancement in coastal wetland in Estern Chongming Island. The results showed that:(1) long-term warming resulted in the quantity of culturable soil microbial increased greatly in warming group than in control group. Warming had a significant effect on the quantity of bacteria, fungi in surface layer. Bacteria number reached the largest increasing rate of 34.16% in the first layer, while fungi number reached the largest increasing rate of 64.42% in the third layer. The effect of warming on actinomycetes was significant in 20-40cm layer, with the largest increasing rate of 59.47%.(2) Long-term warming had little impact on the rhizosphere effect change of reed, with a smaller effect in different layer in warming group. Rhizosphere fungi and actinomycetes of Imperata cylindrical differed obviously in second and third layer, respectively. (3) The study showed different responses of soil culturable microorganism quantity and rhizosphere effect of different plants to long-term warming. There were different increasing percentage of soil culturable microorganism quantity and rhizosphere effect between Phragmites australis and Imperata cylindrical. It might be related to the plant type, the kind and quantity of rhizosphere secretion.

Key words: coastal wetland, long-term temperature enhancement, culturable microorganism quantity, rhizosphere effect

CLC Number: 

  • S342.2
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