Influence of Nitrogen Fertilizer on Methane Oxidation in Mire Soil of Sangjiang Plain

  • 1. The Laboratory of Climate Study of China Meteorological Administration, National Climate Center, Beijing 100081;
    2. Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun, Jilin 130012;
    3. Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008

Received date: 2004-07-07

  Revised date: 2004-12-13

  Online published: 2005-07-20


Wetland, one of the most important ecosystems in the world, plays a significant role in global C and N cycles. Although the majority of studies to date have been centered on wetlands as CH4 sources, wetland soils can however also act as CH4 sinks. It has been recognized that Sanjiang Plain palustrine wetland (45°01'-48°28'N, 130°13'-135°05'E), one of the largest palustrine wetland areas in China, play a significant role in the estimation of CH4 budgets. To find the influence of nitrogen fertilizer on CH4 oxidation in mire soils, the fresh mire soil from Sanjiang Plain was amended with 0, 25 or 50 mg(N)/l NH4HCO3 and incubated at 25℃ over six consecutive periods: first at atmospheric CH4 concentration (about 1.8 μL/L), then at elevated CH4 concentration (about 8000 μL/L) for four times, and finally at concentration of about 1.8μL/L. The addition of NH4HCO3 resulted in reduction in the rate of CH4 oxidation approximately in inverse proportion to the amount of NH4HCO3 added. At ~8000 μL/L, the initial inhibitory effect was gradually released and disappeared during subsequent incubations. Finally, NH4HCO3 addition stimulated the CH4 oxidation. NH4HCO3 addition stimulated the rates of CH4 oxidation by the mire soil at atmospheric CH4 concentration during the final incubation. The initial inhibitory effect of NH4HCO3 addition on CH4 oxidation at both atmospheric CH4 concentration and high CH4 concentration in mire soil is temporary, and the long-term effect of NH4HCO3 addition may be stimulating.

Cite this article

WANG Chang-Ke, LU Xian-Guo, CAI Zu-Cong, LUO Yong . Influence of Nitrogen Fertilizer on Methane Oxidation in Mire Soil of Sangjiang Plain[J]. SCIENTIA GEOGRAPHICA SINICA, 2005 , 25(4) : 490 -494 . DOI: 10.13249/j.cnki.sgs.2005.04.490


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