植物生态学报 ›› 2009, Vol. 33 ›› Issue (3): 617-623.DOI: 10.3773/j.issn.1005-264x.2009.03.021

• 简报 • 上一篇    下一篇

小兴安岭典型草丛沼泽湿地CO2、CH4和N2O的排放动态及其影响因素

牟长城; 石兰英; 孙晓新   

  1. (东北林业大学林学院,哈尔滨 150040)
  • 出版日期:2009-05-31 发布日期:2009-05-31
  • 通讯作者: 牟长城

FLUXES AND CONTROLS OF CO2, CH4 AND N2O IN A MARSH WETLAND OF XIAOXING’AN MOUNTAINS, NORTHEASTERN CHINA

MU Chang-Cheng; SHI Lan-Ying; SUN Xiao-Xin   

  1. College of Forestry, Northeast Forestry University, Harbin 150040, China
  • Online:2009-05-31 Published:2009-05-31
  • Contact: MU Chang-Cheng

摘要: 2007年6~10月, 采用静态箱-气相色谱法, 同步研究了小兴安岭典型修氏苔草(Carex schmidtii)沼泽湿地CO2、CH4和N2O排放通量的季节动态及其与环境因子的关系, 估算了CO2、CH4和N2O的生长季排放量, 探讨了沼泽湿地碳与氮的源汇关系。结果表明: 草丛沼泽生长季节温室气体排放量以CO2占绝对优势(99.61%), CH4的排放量次之(0.39%), N2O的排放量最低(0.000 7%), 且为碳、氮的吸收汇(分别为固定量的53.93%和0.04%); CO2、CH4和N2O生长季平均排放通量依次为487.89、1.88和0.004 mg·m–2·h–1, 且具有明显的季节变化特征, CO2和N2O的最高排放量均出现在夏季(6月24日至8月14日和7月14日至8月14日), CH4的最高排放量出现在夏秋季(8月24日至9月24日), 其中, CO2季节变化与空气温度和0~20 cm土壤温度具有显著相关性(p < 0.05), CH4与空气温度具有显著相关性(p < 0.01), N2O与水位具有显著的负相关性(p < 0.05)。

Abstract: Aims Our objectives were to evaluate the CO2, CH4 and N2O budget for exploring the relationship of source or sink of carbon and nitrogen, to understand seasonal variations of CO2, CH4 and N2O and to explore the effects of temperature and moisture on CO2, CH4 and N2O fluxes in a marsh ecosystem over a growing season.
Methods We analyzed temporal fluxes and factors that influenced CO2, CH4 and N2O fluxes in a Carex schmidtii marsh of Xiaoxing’an Mountains from June to October 2007, using a static chamber and gas chromatograph technique.
Important findings CO2 flux was the highest (99.61%), followed by CH4 (0.39%) and N2O (0.000 7%) in greenhouse gases emission from the marsh. The marsh was a sink of carbon (53.93%) and nitrogen (0.04%). Average CO2, CH4 and N2O fluxes were 487.89, 1.88 and 0.004 mg·m–2·h–1, respectively, and displayed large seasonal variations. The highest emissions of CO2 and N2O were observed in summer (from June 24 to August 14 and from July 14 to August 14, respectively), and the highest emissions of CH4 were in summer and fall (from August 24 to September 24). The CO2 fluxes were significantly correlated with temperature (p < 0.05) (air temperature and soil temperature at 0, 5, 10, 15 and 20 cm), the CH4 fluxes were significantly correlated with air temperature (p < 0.01) and the N2O fluxes were negatively significantly correlated with standing water depth (p < 0.05).