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《Chinese Journal of Ecology》 2008-01
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Effects of temperature and soil moisture on wetland soil organic carbon mineralization

YANG Ji-song1,2,LIU Jing-shuang2,SUN Li-na1(1Key Laboratory of Environmental Engineering,Shenyang University,Shenyang 110044,China;2Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun 130012,China)  
By the method of airtight incubation,this paper studied the dynamic changes of soil organic carbon(SOC) mineralization in Deyeuxia angustifolia wetland,and approached the effects of temperature and soil moisture on the mineralization rate of SOC.The results showed that the SOC mineralization rate was higher in the first 2 days of incubation,but decreased gradually then.Within the period of incubation(33 days),the total amount of mineralized organic carbon in topsoil(0-10 cm) ranged from 1.59 mg C·g-1 to 2.62 mg C·g-1,being 4-22 folds of that in subsoil(10-100 cm).In two water treatments,i.e.,75% of water-holding capacity(WHC) and flooding,this value increased by 60%-210% and 30%-200%,respectively,when the temperature increased 10 degree.The dynamics of SOC mineralization preferably followed the first-order kinetics,and the C0 value decreased exponentially with soil depth.Both the C0 value and the C0/SOC ratio were also increased with increasing temperature.The Q10 values ranged in 1.7-3.1(treatment 75% of WHC) and 1.2-3.0(treatment flooding),and significantly polynomially related to soil depth,indicating that temperature and soil depth affected the SOC mineralization in wetland significantly,while soil moisture did not.
【Fund】: 国家自然科学基金项目(20477029和90211003);; 沈阳大学博士启动基金资助项目
【CateGory Index】: S153
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