Chin J Plan Ecolo ›› 2007, Vol. 31 ›› Issue (3): 394-402.doi: 10.17521/cjpe.2007.0048

• Research Articles • Previous Articles     Next Articles

REVIEW OF WINTER CO2 EFFLUX FROM SOILS: A KEY PROCESS OF CO2 EXCHANGE BETWEEN SOIL AND ATMOSPHERE

WANG Wei; WANG Tao; PENG Shu-Shi; FANG Jing-Yun   

  1. Department of Ecology, College of Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China
  • Online:2007-05-30 Published:2007-05-30
  • Contact: WANG Wei

Abstract:

Winter CO2 efflux from soils is a significant component of annual carb on budgets and can greatly determine carbon balance of ecosystems. However, present estimates of annual soil respiration are mostly based on measurements taken during the growing season and assume that microbial respiration in frozen or snow_covered soils is negligible. We analyze methods used, magnitude of winter soil respiration, and influencing factors. There are very few measurements of winter soil respiration except in tundra and alpine ecosystems. Winter CO2 efflux from soils ranged from 0.002 to 1.359 μmol C·m-2·s-1 and 0.22 to 0.67 μmol C·m-2·s-1 in tundra and forest ecosystems, respectively. No direct relationship bet ween soil temperature and winter CO2 efflux from soils was found, but there is a critical threshold for active respiration, typically between -7 and -5 ℃,blow which lack of free water limits microbial contributions to winter soil respira tion. The depth, timing and duration of snow cover greatly influence the magnitu de of winter CO2 efflux from soils, with water availability an important limiting factor. If insulating snowpack is present, carbon availability also controls heterotrophic activity. We discuss current problems and future research needs.

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