TITLE

Soil moisture influenced the interannual variation in temperature sensitivity of soil organic carbon mineralization in the Loess Plateau

AUTHOR(S)
Zhang, Y.; Guo, S.; Zhao, M.; Du, L.; Li, R.; Jiang, J.; Wang, R.; N. Li
PUB. DATE
January 2015
SOURCE
Biogeosciences Discussions;2015, Vol. 12 Issue 2, p1453
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Temperature sensitivity of SOC mineralization (Q10) determines how strong the feedback from global warming may be on the atmospheric CO2 concentration, thus understanding the factors influencing the interannual variation in Q10 is important to accurately estimate the local soil carbon cycle. In situ SOC mineralization was measured using an automated CO2 flux system (Li-8100) in long-term bare fallow soil in the Loess Plateau (35° 12' N, 107° 40' E) in Changwu, Shaanxi, China form 2008 to 2013. The results showed that the annual cumulative SOC mineralization ranged from 226 to 298 gCm-2 y-1 (mean= 253 gCm-2 y-1; CV= 13 %), annual Q10 ranged from 1.48 to 1.94 (mean= 1.70; CV= 10 %), and annual soil moisture content ranged from 38.6 to 50.7% WFPS (mean= 43.8% WFPS; CV= 11 %), which were mainly affected by the frequency and distribution of precipitation. Annual Q10 showed a negative quadratic correlation with soil moisture. In conclusion, understanding of the relationships between interannual variation in Q10 of SOC mineralization, soil moisture and precipitation is important to accurately estimate the local carbon cycle, especially under the changing climate.
ACCESSION #
100786448

 

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