Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 8 2009 10.5194/bg-6-1361-2009 http://www.biogeosciences.net/6/1361/2009/ http://www.biogeosciences.net/6/1361/2009/bg-6-1361-2009.html http://www.biogeosciences.net/6/1361/2009/bg-6-1361-2009.pdf 1361 1370 2009-08-03 Effects of diurnal warming on soil respiration are not equal to the summed effects of day and night warming in a temperate steppe J. Xia Y. Han Z. Zhang Z. Zhang S. Wan swan@ibcas.ac.cn State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing 100093, China Graduate School of Chinese Academy of Sciences, Yuquanlu, Beijing 100049, China The magnitude of daily minimum temperature increase is greater than that of daily maximum temperature increase under climate warming. This study was conducted to examine whether changes in soil respiration under diurnal warming are equal to the summed changes under day and night warming in a temperate steppe in northern China. A full factorial design with day and night warming was used in this study, including control, day (06:00 a.m.–06:00 p.m., local time) warming, night (06:00 p.m.–06:00 a.m.) warming, and diurnal warming. Day warming showed no effect on soil respiration, whereas night warming significantly increased soil respiration by 7.1% over the 3 growing seasons in 2006–2008. The insignificant effect of day warming on soil respiration could be attributable to the offset of the direct positive effects of increased temperature by the indirect negative effects via aggravating water limitation and suppressing ecosystem C assimilation. The positive effects of night warming on soil respiration were largely due to the stimulation of ecosystem C uptake and substrate supply via overcompensation of plant photosynthesis. Changes in both soil respiration (+20.7 g C m^−2 y^−1) and GEP (−2.8 g C m^−2 y^−1) under diurnal warming are smaller than their summed changes (+40.0 and +24.6 g C m^−2 y^−1, respectively) under day and night warming. Our findings that the effects of diurnal warming on soil respiration and gross ecosystem productivity are not equal to the summed effects of day and night warming are critical for model simulation and projection of climate-carbon feedback. % vor jede Referenz Alward, R. D., Detling, J. K., and Milchunas, D. G.: Grassland vegetation changes and nocturnal global warming, Science, 316, 229–231, 1999. Bahn, M., Knapp, M., Garajova, Z., Pfahringer, N., and Cernusca, A.: Root respiration in temperate mountain grasslands differing in land use, Glob. Change Biol., 12, 995–1006, 2006. Bahn, M., Rodeghiero, M., Anderson-Dunn, M., Dore, S., Gimeno, C., Drösler, M., Williams, M., Ammann, C., Berninger, F., Flechard, C., Jones, S., Balzarolo, M., Kumar, S., Newesely, C., Priwitzer, T., Raschi, A., Siegwolf, R., Susiluoto, S., Tenhunen, J., Wohlfahrt, G., and Cernusca, A.: Soil respiration in European grasslands in relation to climate and assimilate supply, Ecosystems, 11, 1352–1367, 2008. Beier, C., Emmett, B. A., Peñuelas, J., Schmidt, I. K., Tietema, A., Estiarte, M., Gundersen, P., Llorens, L., Riis-Nielsen, T., Sowerby, A., and Gorissen, A.: Carbon and nitrogen cycles in European ecosystems respond differently to global warming, Sci. Total Environ., 407, 692–697, 2008. Coughenour, M. B. and Chen, D.: Assessment of grassland ecosystem responses to atmospheric change using linked plant-soil process models, Ecol. Appl., 7, 802–827, 1997. Cox, P. M., Betts, R. A., Jones, C. D., Spall, S. A., and Totterdell, I. J.: Acceleration of global warming: due to carbon-cycle feedbacks in a coupled climate model, Nature, 408, 184–187, 2000. Craine, J. M., Wedin, D. A., and Chapin III, F. S.: Predominance of ecophysiological controls on soil CO₂ flux in a Minnesota grassland, Plant Soil, 207, 77–86, 1999. Davidson, E. A. and Janssens, I. A.: Temperature sensitivity of soil carbon decomposition and feedbacks to climate change, Nature, 440, 165–173, 2006. Dhakhwa, G. B. and Campbell, C. L.: Potential effects of differential day-night warming in global climate change on crop production, Climatic Change, 40, 647–667, 1998. Easterling, D. R., Horton, B., Jones, P. D., Peterson, T. C., Karl, T. R., Parker, D. E., Salinger, M. J., Razuvayev, V., Plummer, N., Jamason, P., and Folland, C. K.: Maximum and minimum temperature trends for the globe, Science, 277, 364–367, 1997. Fung, I. Y., Doney, S. C., Lindsay, K., and John, J.: Evolution of carbon sinks in a changing climate, P. Natl. Acad. Sci., 102, 11201–11206, 2005. Griffin, K. L., Turnbull, M., Murthy, R., Lin, G., Adams, J., Farnsworth, B., Mahato, T., Bazin, G., Potasnak, M., and Berry, J. A.: Leaf respiration is differentially affected by leaf vs. stand-level night-time warming, Glob. Change Biol., 8, 479–485, 2002. Harte, J. and Shaw, R.: Shifting dominance within a montane vegetation community: results of a climate-warming experiment, Science, 267, 876–880, 1995. Högberg, P., Nordgren, A., Buchmann, N., Taylor, A. F. S., Ekblad, A., Högberg, M. N., Nyberg, G., Ottosson-Löfvenlus, M., and Read, D. J.: Large-scale forest girdling shows that current photosynthesis drives soil respiration, Nature, 411, 789–792, 2001. IPCC: Climate Change 2001: The Scientific Basis, edited by: Hallgren R. and Nyenzi, B., Cambridge University Press, New York, 2001. IPCC: Climate Change 2007: The Physical Science Basis, Cambridge University Press, Cambridge, UK, 2007. Karl, T. R., Kukla, G., Razuvayev, V. N., Changery, M. J., Quayle, R. G., Heim Jr., R. R., Easterling, D. R., and Fu, C. B.: Global warming – evidence for asymmetric diurnal temperature-change, Geophys. Res. Lett., 18, 2253–2256, 1991. King, A. W., Gunderson, C. A., Post, W. M., Weston, D. J., and Wullschleger, S. D.: Plant respiration in a warmer world, Science, 312, 536–537, 2006. Liu, W. X., Zhang, Z., and Wan, S. Q.: Predominant role of water in regulating soil and microbial respiration and their responses to climate change in a semiarid grassland, Glob. Change Biol., 15, 184–195, 2009. Lloyd, J. and Taylor, J. A.: On the temperature dependence of soil respiration, Funct. Ecol., 8, 315–323, 1994. Lobell, D. B.: Changes in diurnal temperature rand and national cereal yields, Agr. Forest Meteorol., 145, 229–238, 2007. Lobell, D. B. and Ortiz-Monasterio, J. I.: Impacts of day versus night temperatures on spring wheat yields: A comparison of empirical and CERES model predictions in three locations, Agron. J., 99, 469–477, 2007. Luo, Y. Q.: Terrestrial carbon-cycle feedback to climate warming, Annu. Rev. Ecol. Syst., 38, 683–712, 2007. Luo, Y. Q. and Zhou, X. H.: Soil Respiration and the Environment, Academic Press, San Diego, Academic/Elsevier, 328~pp., 2006. Luo, Y. Q., Sherry, R., Zhou, X. H., and Wan, S. Q.: Terrestrial carbon-cycle feedback to climate warming: Experimental evidence on plant regulation and impacts of biofuel feedstock harvest, Glob. Change Biol.-Bioenergy, 1, 62–74, 2009. McCormick, A. J., Cramer, M. D., and Watt, D. A.: Sink strength regulate photosynthesis in sugarcane, New Phytol., 171, 759–770, 2006. Nicholls, N.: Increased Australian wheat yield due to recent climate trends, Nature, 387, 484–485, 1997. Niu, S. L., Wu. M. Y., Han, Y., Xia, J. Y., Li, L. H., and Wan, S. Q.: Water-mediated responses of ecosystem carbon fluxes to climatic change in a temperate steppe, New Phytol., 177, 209–219, 2008. Paul, M. J. and Foyer, C. H.: Sink regulation of photosynthesis, J. Exp. Bot., 52, 1381–1400, 2001. Paul, M. J., Pellny, T. K., and Goddijn, O.: Enhancing photosynthesis with sugar signals, Trend. Plant Sci., 6, 197–200, 2001. Peng, S. B., Huang, J. L., Sheehy, J. E., Lazza, R. C., Visperas, R. M., Zhong, X., Centeno, G. S., Khush, G. S., and Cassman, K. G.: Rice yields decline with higher night temperature from global warming, P. Natl. Acad. Sci., 101, 9971–9975, 2004. Raich, J. W. and Tufekcioglu, A.: Vegetation and soil respiration: correlations and controls, Biogeochemistry, 48, 71–90, 2000. 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, 2005. Rosenzweig, C. and Tubiello, F. N.: Effects of changes in minimum and maximum temperature on wheat yields in the central US-A simulation study, Agr. Forest Meteorol., 80, 215–230, 1996. Rustad, L. E., Campbell, J. L., Marion, G. M., Norby, R. J., Mitchell, M. J., Hartley, A. E., Cornelissen, J. H. C., and Gurevitch, J.: A meta-analysis of the response of soil respiration, net nitrogen mineralization, and aboveground plant growth to experimental ecosystem warming, Oecologia, 126, 543–562, 2001. Rustad, L. E.: The response of terrestrial ecosystems to global climate change: Towards an integrated approach, Sci. Total Environ., 404, 222–235, 2008. Ryan, G. R.: Effects of climate change on plant respiration, Ecol. Appl., 1, 157–167, 1991. Schlenker, W. and Roberts, M. J.: Nonlinear effects of weather on corn yields, Rev. Agr. Econ., 28, 391–398, 2006. Shaver, G. R., Canadell, J., Chapin III, F. S., Gurevitch, J., Harte, J., Henry, G., Ineson, P., Jonasson, S., Melillo, J., Pitelka, L., and Rustad, L.: Global warming and terrestrial ecosystems: A conceptual framework for analysis, Bioscience, 50, 871–882, 2000. Stooksbury, D. E. and Michaels, P. J.: Climate change and large-area corn yield in the southeastern United States, Agron. J., 86, 564–569, 1994. Tang, J., Baldocchi, D. D., and Xu, L.: Tree photosynthesis modulates soil respiration on a diurnal time scale, Glob. Change Biol., 11, 1298–1304, 2005. Trumbore, S.: Carbon respired by terrestrial ecosystems-recent progress and challenges, Glob. Change Biol., 12, 141–153, 2006. Turnbull, M. H., Murthy, R., and Griffin, K. L.: The relative impacts of daytime and nighttime warming on photosynthetic capacity in \textitPopulus deltoids, Plant Cell Environ., 25, 1729–1737, 2002. Turnbull, M. H., Tissue, D. T., Murthy, R., Wang, X., Sparrow, A. D., and Griffin, K. L.: Nocturnal warming increase photosynthesis at elevated CO₂ partial pressure in \textitPopulus deltoids, New Phytol., 161, 819–826, 2004. Volder, A., Edwards, E. J., Evans, J. R., Robertson, B. C., Schortemeyer, M., and Gifford, R. M.: Does greater night-time, rather than constant, warming alter growth of managed pasture under ambient and elevated atmospheric CO₂?, New Phytol., 162, 397–411, 2004. Volder, A., Gifford, R. M., and Evans, J. R.: Effects of elevated atmospheric CO₂, cutting frequency, and differential day/night atmospheric warming on root growth and turnover of \textitPhalaris swards, Glob. Change Biol., 13, 1040–1052, 2007. Vose, R. S., Easterling, D. R., and Gleason, B.: Maximum and minimum temperature trends for the globe: an update through 2004, Geophys. Res. Lett., 32, L23822, doi:10.1029/2005GL024379, 2005. Wan, S. Q. and Luo, Y. Q.: Substrate regulation of soil respiration in a tallgrass prairie: results of a clipping and shading experiment, Global Biogeochem. Cy., 17, 1054, doi:10.1029/2002GB001971, 2003. Wan, S. Q., Luo, Y. Q., and Wallace, L. L.: Changes in microclimate induced by experimental warming and clipping in tallgrass prairie, Glob. Change Biol., 8, 754–768, 2002. Wan, S. Q., Norby, R. J., Ledford, J., and Weltzin, J. F.: Responses of soil respiration to elevated CO₂, air warming, and changing soil water availability in a model old-field grassland, Glob. Change Biol., 13, 2411–2424, 2007. Wan, S. Q., Xia, J. Y., Liu, W. X., and Niu, S. L.: Photosynthetic over-compensation under nocturnal warming enhances grassland carbon sequestration, Ecology, 90, 2700–2710, 2009. Xia, J. Y., Niu, S. L., and Wan, S. Q.: Response of ecosystem carbon exchange to warming and nitrogen addition during two climatologically contrasting growing seasons in a temperate steppe, Glob. Change Biol., 15, 1544–1556, 2009. Zavaleta, E. S., Shaw, M. R., Chiariello, N. R., Mooney, H. A., and Field, C. B.: Additive effects of simulated climate changes, elevated CO₂, and nitrogen deposition on grassland diversity, P. Natl. Acad. Sci., 100, 7650–7654, 2003. Zhou, L., Dickinson, R. E., Tian, Y., Vose, R. S., and Dai, Y.: Impact of vegetation removal and soil aridation on diurnal temperature range in a semiarid region: application to the Sahel, P. Natl. Acad. Sci., 104, 17937–17942, 2007. Ziska, L. H. and Manalo, P. A.: Increasing night temperature induces sterility in tropical rice, Aust. J. Plant Physiol., 23, 791–794, 1996.