Abstract
Soil respiration (RSOIL) is the second largest carbon flux between terrestrial systems and the atmosphere, with a magnitude 10 times greater than anthropogenic carbon dioxide production. Therefore, it is important that we understand, and be able to predict, how RSOIL responds to climate change. Although a positive, significant temperature effect on RSOIL has long been recognized, recent studies emphasize the overriding importance of current photosynthesis in controlling RSOIL. We tested the hypothesis that model inclusion of intra-annual variations in aboveground net primary productivity (ANPP) significantly improves RSOIL estimates over predictions based on soil temperature alone. We also evaluated the possibility that canopy production is less directly linked to RSOIL, by testing the hypothesis that intersite differences in RSOIL correlate more strongly with root biomass than with ANPP. We tested these hypotheses by measuring RSOIL, ANPP, and root biomass at four Iowa grasslands that differed in aboveground growth phenology and productivity. Among all sites, intra-annual variations in RSOIL were most strongly related to soil temperature (R 2 = 0.89), not ANPP (R 2 = 0.53). All sites responded identically to changes in soil temperature (site-by-temperature P = 0.53), but inconsistently to variation in aboveground dynamics (site-by-canopy P < 0.0001). Incorporating canopy dynamics into temperature-based predictive models improved model R 2 by a maximum of 0.01. Among-site differences in RSOIL were related to root biomass (P < 0.001) but not ANPP (P = 0.34). We found no useful linkage between canopy characteristics and intra-annual or site-specific RSOIL predictions, perhaps because shoot and root dynamics were not consistently linked through time or among sites.
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Acknowledgments
This work was funded by a United States Department of Agriculture Sustainable Agriculture Research and Education grant rewarded to J. W. Raich, C. A Cambardella, T. M. Isenhart, R. C. Schultz, and W. W. Simpkins, and a National Sci Foundation (DEB 034376 to J.W. Raid and G. Mora). We thank I. Larson, R. and S. Risdal, J. Risdal, and L. Strum for allowing access to their land. E. Arentson, K. C. Dohse, K. Larsen-Ferree, J. McGuire, T. Price, and M. Shimerdla contributed numerous hours of hard work in the field and laboratory. R. Schultz, T. Isenhart, J. Nelson, and E. Stuaffer and the Departmen of Ecology, Evolution, and Organismal Biology at Iowa State University, and Naturo and Applied Sciences at the university of Wisconsin Green Bay provided valuable logistical and technical support during this project. We are also grateful to T. Parkin, B. Wilsey, and several anonymous reviewers for their valuable comments on earlier versions of the manuscript.
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Dornbush, M.E., Raich, J.W. Soil Temperature, Not Aboveground Plant Productivity, Best Predicts Intra-Annual Variations of Soil Respiration in Central Iowa Grasslands. Ecosystems 9, 909–920 (2006). https://doi.org/10.1007/s10021-005-0093-7
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DOI: https://doi.org/10.1007/s10021-005-0093-7