Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 4 2008 10.5194/bg-5-1175-2008 http://www.biogeosciences.net/5/1175/2008/ http://www.biogeosciences.net/5/1175/2008/bg-5-1175-2008.html http://www.biogeosciences.net/5/1175/2008/bg-5-1175-2008.pdf 1175 1188 2008-08-26 Measurement depth effects on the apparent temperature sensitivity of soil respiration in field studies A. Graf a.graf@fz-juelich.de L. Weihermüller J. A. Huisman M. Herbst J. Bauer H. Vereecken Forschungszentrum Jülich, Agrosphere Institute (ICG-4), Institute for Chemistry and Dynamics of the Geosphere, 52425 Jülich, Germany CO₂ efflux at the soil surface is the result of respiration in different depths that are subjected to variable temperatures at the same time. Therefore, the temperature measurement depth affects the apparent temperature sensitivity of field-measured soil respiration. We summarize existing literature evidence on the importance of this effect, and describe a simple model to understand and estimate the magnitude of this potential error source for heterotrophic respiration. The model is tested against field measurements. We discuss the influence of climate (annual and daily temperature amplitude), soil properties (vertical distribution of CO₂ sources, thermal and gas diffusivity), and measurement schedule (frequency, study duration, and time averaging). <i>Q</i>₁₀ as a commonly used parameter describing the temperature sensitivity of soil respiration is taken as an example and computed for different combinations of the above conditions. We define conditions and data acquisition and analysis strategies that lead to lower errors in field-based <i>Q</i>₁₀ determination. It was found that commonly used temperature measurement depths are likely to result in an underestimation of temperature sensitivity in field experiments. Our results also apply to activation energy as an alternative temperature sensitivity parameter. Bahn, M., Rodeghiero, M., Anderson-Dunn, M., et al.: Soil respiration in European grasslands in relation to climate and assimilate supply. Ecosystems, in press, 2008. Bauer, J., Herbst, M., Huisman, J. A., Weihermüller, L., and Vereecken, H.: Sensitivity of simulated soil heterotrophic respiration to temperature and moisture reduction functions, Geoderma, 145, 17–27, 2008. Boone, R. D., Nadelhoffer, K. J., Canary, J. D., and Kaye, J. P.: Roots exert a strong influence on the temperature sensitivity of soil respiration, Nature, 396, 570–572, 1998. Borken, W., Davidson, E. A., Savage, K., Gaudinski, J., and Trumbore, S. E.: Drying and wetting effects on carbon dioxide release from organic horizons, Soil Sci. Soc. Am. J., 67, 1888–1896, 2003. Chen, X. Y., Eamus, D., and Hutley, L. B.: Seasonal patterns of soil carbon dioxide efflux from a wet-dry tropical savanna of northern Australia, Aust. J. Bot., 50, 43–51, 2002. Conen, F., Leifeld, J., Seth, B., and Alewell, C.: Warming mineralises young and old carbon equally, Biogeosciences, 3, 515–519, 2006. Davidson, E. A. and Janssens, I. A.: Temperature sensitivity of soil carbon decomposition and feedbacks to climate change, Nature, 440, 165–173, 2006. Davidson, E. A., Belk, E., and Boone, R. D.: Soil water content and temperature as independent or confounded factors controlling soil respiration in a temperate mixed hardwood forest, Global Change Biol., 4, 217–227, 1998. Davidson, E. A., Janssens, I. A., and Luo, Y.: On the variability of respiration in terrestrial ecosystems: moving beyond $Q_10$, Glob. Change Biol., 12, 154–164, 2006. deForest, J. L., Noormets, A., McNulty, S. G., Sun, G., Tenney, G., and Chen, J.: Phenophases alter the soil respiration-temperature relationship in an oak-dominated forest, Int. J. Biometeorol., 51, 135–144, 2006. Dugas, W. A.: Micrometeorological and Chamber Measurements of \chemCO_2 Flux from Bare Soil, Agr. Forest Meteorol., 67, 115–128, 1993. Fang, C., Moncrieff, J. B., Gholz, H. L., and Clark, K. L.: Soil \chemCO_2 efflux and its spatial variation in a Florida slash pine plantation, Plant Soil, 205, 135–146, 1998. Fang, C. M., Smith, P., Moncrieff, J. B., and Smith, J. U.: Similar response of labile and resistant soil organic matter pools to changes in temperature, Nature, 433, 57–59, 2005. Fierer, N., Allen, A. S., Schimel, J. P., and Holden, P.: Controls on microbial \chemCO_2 production: a comparison of surface and subsurface horizons, Global Change Biol., 9, 1322–1332, 2003. Fontaine, S., Barot, S., Barre, P., Bdioui, N., Mary, B., and Rumpel, C.: Stability of organic carbon in deep soil layers controlled by fresh carbon supply, Nature, 450, 277–281, 2007. Gaumont-Guay, D., Black, T. A., Griffis, T. J., Barr, A. G., Jassal, R. S., and Nesic, Z.: Interpreting the dependence of soil respiration on soil temperature and water content in a boreal aspen stand, Agr. Forest Meteorol., 140, 220–235, 2006. Graf, A., Kuttler, W., and Werner, J.: Mulching as means to exploit dewfall for arid agriculture?, Atmos. Res., 87, 369–376, 2008. Hanson, P. J., Edwards, N. T., Garten, C. T., and Andrews, J. A.: Separating root and soil microbial contributions to soil respiration: A review of methods and observations, Biogeochemistry, 48, 115–146, 2000. Hashimoto, S. and Komatsu, H.: Relationships between soil \chemCO_2 concentration and \chemCO_2 production, temperature, water content, and gas diffusivity: implications for field studies through sensitivity analyses, J. Forest Res.-JPN, 11, 41–50, 2006. Herbst, M., Hellebrand, H. J., Bauer, J., Huisman, J. A., Simunek, J., Weihermüller, L., Graf, A., Vanderborght, J., and Vereecken, H.: Multiyear heterotrophic soil respiration: evaluation of a coupled \chemCO_2 transport and carbon turnover model, Ecol. Model., 214, 271–283, 2008. Heusinkveld, B. G., Jacobs, A. F. G., Holtslag, A. A. M., and Berkowicz, S. M.: Surface energy balance closure in an arid region. Role of soil heat flux, Agr. Forest Meteorol., 122, 21–37, 2004. Hirano, T., Kim, H., and Tanaka, Y.: Long-term half-hourly measurement of soil \chemCO_2 concentration and soil respiration in a temperate deciduous forest, J. Geophys. Res. Atmos., 108(D20), 4631, doi:10.1029/2003JD003766, 2003. Humphreys, E. R., Black, T. A., Morgenstern, K., Cai, T. B., Drewitt, G. B., Nesi, Z., and Trofymow, J. A.: Carbon dioxide fluxes in coastal Douglas-fir stands at different stages of development after clearcut harvesting, Agr. Forest Meteorol., 140, 6–22, 2006. Karam, M. A.: A thermal wave approach for heat transfer in a nonuniform soil, Soil Sci. Soc. Am. J., 64, 1219–1225, 2000. Kätterer, T., Reichstein, M., Andrén, O., and Lomander, A.: Temperature dependence of organic matter decomposition: a critical review using literature data analyzed with different models, Biol. Fert. Soils, 27, 258–262, 1998. Khomik, M., Arain, M. A., and McCaughey, J. H.: Temporal and spatial variability of soil respiration in a boreal mixedwood forest, Agr. Forest Meteorol., 140, 244–256, 2006. Kim, J. and Verma, S. B.: Soil \chemCO_2 flux in a Minnesota peatland, Biogeochemistry, 18, 37–51, 1992. Kirschbaum, M. U. F.: The temperature dependence of organic-matter decomposition – still a topic of debate, Soil Biol. Biochem., 38, 2510–2518, 2006. Knorr, W., Prentice, I. C., House, J. I., and Holland, E. A.: Long-term sensitivity of soil carbon turnover to warming, Nature, 433, 298–301, 2005. Larinova, A. A., Yevdokimov, I. V., and Bykhovets, S. S.: Temperature response of soil respiration is dependent on concentration of readily decomposable C, Biogeosciences, 4, 1073–1081, 2007. Law, B. E., Falge, E., Gu, L., et al.: Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation, Agr. Forest Meteorol., 113, 97–120, 2002. Lloyd, J. and Taylor, J. A. On the temperature-dependence of soil respiration, Funct. Ecol., 8, 315–323, 1994. Lou, Y. S., Li, Z. P., and Zhang, T. L.: Soil \chemCO_2 flux in relation to dissolved organic carbon, soil temperature and moisture in a subtropical arable soil of China, J. Environ. Sci.-China, 15, 715–720, 2003. Massman, W. J.: Periodic temperature variations in an inhomogeneous soil: a comparison of exact and analytical expressions, Soil Sci., 155, 331–338, 1993. Moyano, F. E., Kutsch, W. L., and Rebmann, C.: Soil respiration fluxes in relation to photosynthetic activity in broad-leaf and needle-leaf forest stands, Agr. Forest Meteorol., 148, 135–143, 2008. Nassar, I. N. and Horton, R.: Determination of the apparent thermal diffusivity of a nonuniform soil, Soil Sci., 147, 238–244, 1989. Novak, M. D.: Determination of soil carbon dioxide source-density profiles by inversion from soil-profile gas concentrations and surface flux density for diffusion-dominated transport, Agr. Forest Meteorol., 146, 189–204, 2007. Novick, K. A., Stoy, P. C., Katul, G. G., Ellsworth, D. S., Siqueira, M. B. S., Juang, J., and Oren, R.: Carbon dioxide and water vapor exchange in a warm temperate grassland, Oecologia, 138, 259–274, 2004. Pavelka, M., Acosta, M., Marek, M. V., Kutsch, W., and Janous, D.: Dependence of the Q10 values on the depth of the soil temperature measuring point, Plant Soil, 292, 171–179, 2007. Perrin, D., Laitat, E., Yernaux, M., and Aubinet, M.: Modelling the response of forest soil respiration fluxes to the main climatic variables, Biotechnol. Agron. Soc. Environ., 8, 15–25, 2004. Raich, J. W. and Schlesinger, W. H.: The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate, Tellus, 44(B), 81–99, 1992. Reichstein, M. and Beer, C.: Soil respiration across scales: The importance of a model-data integration framework for data interpretation, J. Plant Nutr. Soil Sci., 171, 1–11, 2008. Reichstein, M., Subke, J. A., Angeli, A. C., and Tenhunen, J. D.: Does the temperature sensitivity of decomposition of soil organic matter depend upon water content, soil horizon, or incubation time?, Glob. Change Biol., 11, 1754–1767, 2005a. Reichstein, M., Kätterer, T., Andrèn, O., Ciais, P., Schulze, E. D., Cramer, W., Papale, D., and Valentini, R.: Temperature sensitivity of decomposition in relation to soil organic matter pools: critique and outlook, Biogeosciences, 2, 317–321, 2005b. Sanderman, J., Amundson, R. G., and Baldocchi, D. D.: Application of eddy covariance measurements to the temperature dependence of soil organic matter mean residence time, Global Biogeochem. Cy., 17, 1061, doi:10.1029/2001GB001833, 2003. Savage, K. E. and Davidson, E. A.: A comparison of manual and automated systems for soil \chemCO_2 flux measurements: trade-offs between spatial and temporal resolution, J. Exp. Bot., 54, 891–899, 2003. Shi, P. L., Zhang, X. Z., Zhong, Z. M., and Ouyang, H.: Diurnal and seasonal variability of soil \chemCO_2 efflux in a cropland ecosystem on the Tibetan Plateau, Agr. Forest Meteorol., 137, 220–233, 2006. Simunek, J. and Suarez, D. L.: Modeling of carbon-dioxide transport and production in soil. 1. Model development, Water Resour. Res., 29, 487–497, 1993. Solomon, S., Qin, D., Manning, M., et al. (Eds.): Climate Change 2007: The Physical Science Basis, Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 501–539, 2007. Takahashi, A., Hiyama, T., Takahashi, H. A., and Fukushima, Y.: Analytical estimation of the vertical distribution of \chemCO_2 production within soil: application to a Japanese temperate forest, Agr. Forest Meteorol., 126, 223–235, 2004. Takle, E. S., Massmann, W. J., Brandle, J. R., et al.: Influence of high-frequency ambient pressure pumping on carbon dioxide efflux from soil, Agr. Forest Meteorol., 124, 193–206, 2004. Tang, J. W., Baldocchi, D. D., Qi, Y., and Xu, L. K.: Assessing soil \chemCO_2 efflux using continuous measurements of \chemCO_2 profiles in soils with small solid-state sensors, Agr. Forest Meteorol., 118, 207–220, 2003. Tang, J. W., Baldocchi, D., and Xu, L. K.: Tree photosynthesis modulates soil respiration on a diurnal time scale, Global Change Biol., 11, 1298–1304, 2005. Tang, J., Bolstad, P. V., Desai, A. R., Martin, J. G., Cook, B. D., Davis, K. J., and Carey, E. V.: Ecosystem respiration and its components in an old-growth forest in the Great lakes region of the United States, Agric. For. Meteorol., 148, 171–185, 2008. Tuomi, M., Vanhala, P., Karhu, K., Fritze, H., and Liski, J.: Heterotrophic soil respiration - Comparison of different models describing its temperature dependence, Ecol. Model., 211, 182–190, 2008. van Wijk, W. R. (Ed.): Physics of Plant Environment, North Holland, Amsterdam, The Netherlands, p. 133–134, 1963. Verhoef, A., van den Hurk, B. J. J. M., Jacobs, A. F. G., and Heusinkveld, B. G.: Thermal soil properties for vineyard (EFEDA-I) and savanna (HAPEX-Sahel) sites, Agr. Forest Meteorol., 78, 1–18, 1996. Wang, C., Yang, J., and Zhang, Q.: Soil respiration in six temperate forests in China, Global Change Biol., 12, 2103–2114, 2006. Weber, S., Graf, A., and Heusinkveld, B. G.: Accuracy of soil heat flux plate measurements in coarse substrates – Field measurements versus a laboratory test, Theor. Appl. Climatol., 89, 109–114, 2007. Weihermüller, L., Huisman, J. A., Lambot, S., Herbst, M., and Vereecken, H.: Mapping the spatial variation of soil water content at the field scale with different ground penetrating radar techniques, J. Hydrol., 340, 205–216, 2007. Weihermüller, L., Huisman, J. A., Graf, A., Herbst, M., and Sequaris, J.-M.: Multistep outflow experiments for the simultaneous determination of soil physical and \chemCO_2 production parameters, Vadose Zone J., in press, 2008. Werner, D., Grathwohl, P., and Höhener, P.: Review of field methods for the determination of the tortuosity and effective gas-phase diffusivity in the vadose zone, Vadose Zone J., 3, 1240–1248, 2004. Xu, M. and Qi, Y.: Spatial and seasonal variations of $Q_10$ determined by soil respiration measurements at a Sierra Nevada forest, Global Biogeochem. Cy., 15, 687–696, 2001. Yuste, J. C., Janssens, I. A., Carrara, A., and Ceulemans, R.: Interactive effects of temperature and precipitation on soil respiration in a temperate maritime forest, Tree Physiol., 23, 1263–1270, 2003. Yuste, J. C., Janssens, I. A., Carrara, A., and Ceulemans, R.: Annual Q(10) of soil respiration reflects plant phenological patterns as well as temperature sensitivity, Global Change Biol., 10, 161–169, 2004. Zmarsly, E., Kuttler, W., and Pethe, H.: Meteorologisch-klimatologisches Grundwissen, Ulmer, Stuttgart, Germany, p.167, 2002.