CO2 efflux from different forest soi

CO2 efflux from different forest soils and impact factors in Dinghu Mountain, China

CO2 fluxes from soils and related environmental factors were measured in three forest ecosystems of Dinghu Mountain using static chamber-gas chromatograph technique for one year. The seasonal pattern of CO2 flux, contribution of litter on total CO2 flux and the correlations of CO2 flux with soil temperature and soil water content were examined for each type of forest. The results were given as followings: (1) The seasonal patterns of CO2 flux from soil of the three types of forest were similar, with a higher CO2 flux in rainy season than in dry season. The comparative relations of mean annual CO2 fluxes between the three sites were expressed as:monsoon forest ＞ mixed forest ＞ pine forest. (2) CO2 fluxes from litter decomposition in monsoon forest, mixed forest and pine forest accounted for 24.43%, 41.75% and 29.23% of the corresponding total CO2 fluxes from forest floor, respectively. (3) Significant relationships were found between CO2 fluxes and soil temperatures at 5 cm depth for the three types of forest, which could be best described by exponential equations. The calculated Q10 values based on soil temperature at 5 cm depth ranged from 1.86 to 3.24. More significant relationships were found between CO2 fluxes and soil water content when the annual variation coefficients of soil moisture were higher.

作 者： ZHOU Cunyu Zhou Guoyi ZHANG Deqiang Wang Yinghong Liu Shizhong   作者单位： ZHOU Cunyu,Zhou Guoyi,ZHANG Deqiang,Liu Shizhong(Dinghushan Forest Ecosystem Research Station, Chinese Academy of Sciences, Guangzhou 510650, China)

Wang Yinghong(Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China) 

刊 名： 中国科学D辑（英文版）  SCI 英文刊名： SCIENCE IN CHINA (EARTH SCIENCES)  年，卷(期)： 2005 48(z1)  分类号： P4  关键词： CO2 flux   litter decomposition   Q10   soil moisture  

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