TY - GEN
T1 - Simulating effects of temperature and moisture on carbon emission of permafrost peatland in Mohe, China
AU - Wang, Xianwei
AU - Li, Xiuzhen
AU - Lv, Jiujun
AU - Sun, Ju
AU - Li, Zongmei
PY - 2009
Y1 - 2009
N2 - The response of stores of carbon in peatland to global warming is a major uncertainty in predicting the future carbon budget. We used a short-term laboratory incubation to simulate effects on the potential CO2 emission of peatland soil in Mohe, China under soil temperature (5, 10 15 and 20°C ) and soil moisture (0, 30, 60, 100%WHC and completely water saturated). The rates of peat carbon mineralized decreased greatly in the earlier phase, but became stabile after 20 days and total carbon mineralization ranged 20.04 to 112.92 mg across sites and experiment treatments. Carbon mineralization rates decreased with soil depth, increased with temperature and reached highest rates at 60%WHC at the same temperature for all treatments. The calculated Q10 values ranged from 1.878 to 2.181, varying with the soil depths and soil moisture. The sensitivity of Cflux to moisture depend on temperature. However the Q10 was not significantly affected by soil moisture and depth. We developed a two compartment model to predict the measured CO2 emission as a multiplicative function of temperature and moisture and the model predicted Cflux very well (R 2>0.888, P<0.001). Our results indicate that the Mohe peatlands would lead to a positive feedback effect on climate change. It is necessary to include such responses in models science they might represent a potential C emission source to peatland ecosystem.
AB - The response of stores of carbon in peatland to global warming is a major uncertainty in predicting the future carbon budget. We used a short-term laboratory incubation to simulate effects on the potential CO2 emission of peatland soil in Mohe, China under soil temperature (5, 10 15 and 20°C ) and soil moisture (0, 30, 60, 100%WHC and completely water saturated). The rates of peat carbon mineralized decreased greatly in the earlier phase, but became stabile after 20 days and total carbon mineralization ranged 20.04 to 112.92 mg across sites and experiment treatments. Carbon mineralization rates decreased with soil depth, increased with temperature and reached highest rates at 60%WHC at the same temperature for all treatments. The calculated Q10 values ranged from 1.878 to 2.181, varying with the soil depths and soil moisture. The sensitivity of Cflux to moisture depend on temperature. However the Q10 was not significantly affected by soil moisture and depth. We developed a two compartment model to predict the measured CO2 emission as a multiplicative function of temperature and moisture and the model predicted Cflux very well (R 2>0.888, P<0.001). Our results indicate that the Mohe peatlands would lead to a positive feedback effect on climate change. It is necessary to include such responses in models science they might represent a potential C emission source to peatland ecosystem.
KW - Incubation
KW - Mineralization
KW - Model
KW - Simulate
UR - https://www.scopus.com/pages/publications/72749085126
U2 - 10.1109/ICBBE.2009.5163388
DO - 10.1109/ICBBE.2009.5163388
M3 - 会议稿件
AN - SCOPUS:72749085126
SN - 9781424429028
T3 - 3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009
BT - 3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009
T2 - 3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009
Y2 - 11 June 2009 through 13 June 2009
ER -
