Abstract
Nitrogen deposition and global warming each have potential to alter soil carbon storage via changing decomposition, but combined effects of N addition and temperature on CO2 production in wetland soils are less studied. In this study, we conducted laboratory incubations to examine this problem using soil from a freshwater marsh in Sanjiang Plain, China. We found that N addition and temperature had a negative and positive effect on CO2 production, respectively. Despite low decomposition rates, heavy fractions had a notable contribution to CO2 production due to greater mass proportion in soil. Short-term combined effect of N addition and temperature on CO2 production was antagonistic. Based on greater N availability as N addition and temperature increasing, extra release of soil-derived N may further suppress CO2 production. We suggest that short-term soil CO2 production under simultaneous influence of temperature and N addition may be overestimated based on their single effects in this site.
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Acknowledgments
This research was supported by National Natural Science Foundation of China (No. 41125001, 40930527), Strategic Priority Research Program — Climate Change: Carbon Budget and Related Issue of the Chinese Academy of Sciences (No. XDA05050508, XDA05020502), National Basic Research Program (973) of China (No. 2009CB421103) and the Key Project of Chinese Academy of Sciences (KZCX2-YW-JC301). We would like to thank the staff of Sanjiang Mire Wetland Experimental Station, Chinese Academy of Sciences, for their help in the field investigation.
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Tao, B., Song, C. & Guo, Y. Short-term Effects of Nitrogen Additions and Increased Temperature on Wetland Soil Respiration, Sanjiang Plain, China. Wetlands 33, 727–736 (2013). https://doi.org/10.1007/s13157-013-0432-y
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DOI: https://doi.org/10.1007/s13157-013-0432-y