地理科学

地理科学 ›› 2005, Vol. 25 ›› Issue (4): 490-494.doi: 10.13249/j.cnki.sgs.2005.04.490

• 论文 • 上一篇    下一篇

氮肥对三江平原沼泽土氧化CH4的影响

王长科1,2, 吕宪国2, 蔡祖聪3, 罗勇1   

  1. 1. 国家气候中心, 北京 100081;
    2. 中国科学院东北地理与农业生态研究所, 吉林 长春 130012;
    3. 中国科学院南京土壤研究所, 江苏 南京210008
  • 收稿日期:2004-07-07 修回日期:2004-12-13 出版日期:2005-07-20 发布日期:2005-07-20
  • 基金资助:
    中国科学院知识创新工程项目(KZCX3-SW-NA-01)、国家自然科学基金项目(40375026)、中国气象局气候研究开放实验室课题(LCS0025C)资助。

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

WANG Chang-Ke1,2, LU Xian-Guo2, CAI Zu-Cong3, LUO Yong1   

  1. 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:2004-07-07 Revised:2004-12-13 Online:2005-07-20 Published:2005-07-20

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摘要： 三江平原新鲜沼泽土添加不同量的NH4HCO3后,在25°C下进行了6次连续培养。首次在大气浓度CH4(约1.8 μl/l)中培养时,供试沼泽土氧化大气CH4速率与NH4HCO3的加入量成反比,表明NH4+最初抑制沼泽土氧化大气浓度CH4。第1次用高浓度CH4(约8 000 μl/l)培养沼泽土时,铵态氮抑制供试沼泽土氧化高浓度CH4,但随着培养的继续,铵态氮的抑制作用逐渐减弱,最终转变为促进供试沼泽土氧化高浓度CH4。经过高浓度CH4培养后,添加NH4HCO3的供试沼泽土氧化大气CH4速率上升2.6~5倍,且与NH4HCO3的加入量呈正相关,表明铵态氮肥最初对沼泽土氧化CH4的抑制作用已经转变为促进作用。铵态氮对沼泽土氧化大气浓度CH4和高浓度CH4的抑制作用都是短暂的,其长期作用将是促进沼泽土氧化CH4。

Abstract: 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.

中图分类号: 

  • S153.6+1/P593