Response of Soil Microbe Quantity and Active Carbon in Wetland to CO2 Elevation during Growth Phase
An experiment was carried out with different treatments in nitrogen supply (0, 5, 15 g·m-2) and CO2 level (350 vs 700 μmol·mol-1) in the OTCs top chamber) to investigate soil microbe quantity and active carbon in wetland of Sanjiang Plain. The results showed that the response of soil organic carbon elevated CO2 was slight, but there was a definite increase in all the active carbon pools with different nitrogen level on exposure to elevated CO2 concentration during the growth phase, except LBC with high nitrogen supply. Higher microbe quantity was also found under elevated CO2 concentration. Bacteria and quantity had increased by 13.51% and 21.0% respectively. In addition, elevated CO2 concentration increased aboveground and belowground biomass Calamagrostis angustifolia, especially under ample nitrogen fertilization application. Baterial and fungi quantity showed strong relativity with plant biomass. Regression analysis also indicated MBC, DOC and CHC had strong relationship with biomass, especially with belowground biomass. Increased soil microbe quantity and active organic carbon were presumedly due to belowground biomass and root secretion enhancement under elevated CO2.
microbe quantity active carbon CO2 elevation wetland
ZHAO Guangying LIU Jingshuang Wang Yang Chen Yanmei
(1 Northeast Institute of Geography and Agroecology,Chinese Academy of Science,Changchun 130012,Jili Northeast Institute of Geography and Agroecology,Chinese Academy of Science,Changchun 130012,Jilin,C Heilongjiang College of Industry and Commerce,Harbin 150001,Heilongjiang,China
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1923-1928
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）