The Temperature Sensitivity of Coarse Woody Debris (CWD) Respiration in Different Decay Classes at Wanmulin Nature Reserve
The respiration of coarse woody debris (CWD) is an important component of carbon budgets in forest ecosystems, and temperature is the principal factor influencing CO2 flux of CWD. The CWD of five decay classes were incubated at the temperatures of 5℃, 15℃, 25℃, 35℃ and 45℃ in laboratory and their respirations were measured using an infrared gas exchange analyzer ( Li-8100 IRGA). The Q10 value of every decay class in different temperature range was also calculated. The results showed that the respiration rate of CWD increased exponentially with temperature, and was positively correlated with decay class. The range of Q10 values for different decay class was 1.06～2.76. The maximum Q10 value for the CWD respiration was 2.31 at the temperature range of 15～25℃. The Q10 value of different decay class CWD changed with temperature. The Q10 value of decay class Ⅲ was higher than others at the temperature range of 5～45℃ and 25～35℃, and there was negative correlation between the Q10 value and the decay class of CWD at the temperature range of 15～25℃ and 35～45℃.
coarse woody debris (CWD)respirationdecay classtemperatureQ10 value
NETL
NSTL
万方数据
维普
