Effect of temperature on soil respiration in a Chinese fir forest

Soil samples collected from the surface soil (0(10 cm) in an 88-year-old Chinese fir (Cunninghamia lanceolata) forest in Nanping, Fujian, China were incubated for 90 days at the temperatures of 15°C, 25°C and 35°C in laboratory. The soil CO2 evolution rates were measured at the incubation time of 2, 5, 10, 15, 20, 25, 30, 35, 40, 50, 60, 70, 80 and 90 days. The results showed that CO2 evolution rates of soil samples varied significantly with incubation time and temperature during the incubation period. Mean CO2 evolution rate and cumulative amount of CO2 evolution from soil were highest at 35°C, followed by those at 25°C, and 15°C. Substantial differences in CO2 evolution rate were found in Q10 values calculated for the 2nd and 90th day of incubation. The Q10 value for the average CO2 evolution rate was 2.0 at the temperature range of 15-25°C, but it decreased to 1.2 at 25- 35°C. Soil CO2 evolution rates decreased with the incubation time. The cumulative mineralized C at the end of incubation period (on the 90th day) was less than 10% of the initial C amounts prior to incubation.

作 者： GUO Jian-fen YANG Yu-sheng LIU Le-zhong ZHAO Yue-cai CHEN Zeng-wen MAO Yan-ling   作者單位： GUO Jian-fen(Key Laboratory of Humid Subtropical Eco-geographical Process of the Ministry of Education, College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, P. R. China;Post-doctoral Research Station of Geography, Fujian Normal University, Fuzhou, 350002,P.R.China)

YANG Yu-sheng,LIU Le-zhong,ZHAO Yue-cai,CHEN Zeng-wen(Key Laboratory of Humid Subtropical Eco-geographical Process of the Ministry of Education, College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, P. R. China)

MAO Yan-ling(College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China) 

刊 名： 林業研究（英文版）  英文刊名： JOURNAL OF FORESTRY RESEARCH  年，卷(期)： 2009 20(1)  分類號： S7  關鍵詞： forest soil   Chinese fir   respiration   temperature  

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