Abstract
To gain new insights into the underlying mechanisms responsible for wetting-induced soil respiration, rain simulation field experiments were carried out in two temperate mixed-hardwood forests in New England (Great Mountain Forest and Harvard Forest). The rain-induced CO2 pulses were observed in both xeric and mesic soils. The pulse intensity was negatively correlated with the site moisture level and the pre-rain soil CO2 flux. At both forests, plots without O horizon responded to wetting with limited or even negative enhancement, confirming previous finding that the rain pulse was likely due to enhanced microbial consumption on substrates mainly of microbial origin. Our results show that the flux rain pulse was a reproducible phenomenon not limited to dry soils.
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Acknowledgments
This work was supported by the U.S. Department of Energy's Office of Science (BER) through the Northeastern Regional Center of the National Institute for Climatic Change Research and by a Yale University graduate fellowship. We thank Peter Raymond and Graeme Berlyn for their comments on this work, Jeff Sigler, Gelan, Carmen and Wei-Chien for assitance with the field experiment, and Kyounghee Kim for help with statistical data analysis.
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Wu, HJ., Lee, X. Short-term effects of rain on soil respiration in two New England forests. Plant Soil 338, 329–342 (2011). https://doi.org/10.1007/s11104-010-0548-2
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DOI: https://doi.org/10.1007/s11104-010-0548-2