Chin J Plant Ecol ›› 2009, Vol. 33 ›› Issue (3): 617-623.DOI: 10.3773/j.issn.1005-264x.2009.03.021

Special Issue: 碳水能量通量

• Research Communications • Previous Articles     Next Articles

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
  • Received:2008-02-20 Accepted:2009-02-01 Online:2009-02-20 Published:2009-05-31

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).

Key words: marsh, greenhouse gas emission, Xiaoxing’an Mountains