Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 1 2010 10.5194/bg-7-395-2010 http://www.biogeosciences.net/7/395/2010/ http://www.biogeosciences.net/7/395/2010/bg-7-395-2010.html http://www.biogeosciences.net/7/395/2010/bg-7-395-2010.pdf 395 407 2010-01-29 Effects of multiple environmental factors on CO2 emission and CH4 uptake from old-growth forest soils H. J. Fang G. R. Yu yugr@igsnrr.ac.cn S. L. Cheng T. H. Zhu Y. S. Wang J. H. Yan M. Wang M. Cao M. Zhou Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China College of Ecology and Environmental Sciences, Inner Mongolia Agricultural University, Hohhot 010019, China To assess contribution of multiple environmental factors to carbon exchanges between the atmosphere and forest soils, four old-growth forests referred to as boreal coniferous forest, temperate needle-broadleaved mixed forest, subtropical evergreen broadleaved forest and tropical monsoon rain forest were selected along eastern China. In each old-growth forest, soil CO2 and CH4 fluxes were measured from 2003 to 2005 applying the static opaque chamber and gas chromatography technique. Soil temperature and moisture at the 10 cm depth were simultaneously measured with the greenhouse gas measurements. Inorganic N (NH4+-N and NO3−-N) in the 0–10 cm was determined monthly. From north to south, annual mean CO2 emission ranged from 18.09 ± 0.22 to 35.40 ± 2.24 Mg CO2 ha−1 yr−1 and annual mean CH4 uptake ranged from 0.04 ± 0.11 to 5.15 ± 0.96 kg CH4 ha−1 yr−1 in the four old-growth forests. Soil CO2 flux in the old-growth forests was mainly driven by soil temperature, followed by soil moisture and NO3−-N. Temperature sensitivity (Q10) of soil CO2 flux was lower at lower latitudes with high temperature and more precipitation, probably because of less soil organic carbon (SOC). Soil NO3− accumulation caused by environmental change was often accompanied by an increase in soil CO2 emission. 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