[1] Keeling C D,Whorf T P.Atmospheric CO2 Records from Sites in the SIO Air Sampling Network[N]//CDIC.Trends 1993:A compendium of Data on Global Change.Dak Ridge,USA:ORNL,1994:16-26.
[2] IPCC.Climate change 2007:The physical Science Basis Contributin of Working group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change[M].New York,USA:Cambridge University Press,2007:749-766.
[3] IPCC.Climate Change 2001:the Scientific Basis-Summary for policymakers[R].2001:IPCC WGI Third Assessment Report.Shanghai Draft,2001.
[4] Luo Y Q,Sherry R,Zhou X H,et al.Terrestrial carbon-cycle feedback to climate warming:experimental evidence on plant regulation and impacts of biofuel feedstock harvest[J].Global Chane Biology-Bioenergy,2009,1:62-74.
[5] Law B E,Ryan M G,Anthoni P M.Seasonal and annual respiration of a ponderosa pine ecosystem[J].Global Change Biology,1999,5:169-182.
[6] Atkin O K,Edards E J,Loveys B R.Response of root respiration to changes in temperature and its relevance to global warming[J].New Phytologist,2000,147:141-154.
[7] Liang J Y,Xia J Y,Liu L L,et al.Global patterns of the responses of leaf-level photosynthesis and respiration in terrestrial plants to experimental warming[J].Journal of Plant Ecology,2013,6(6):437-447.
[8] Zhou X,Liu X,Wallace L,et al.Photosynthetic and respiratory acclimation to experimental warming for four species in a tallgrass prarie ecosystem[J].Journal of Intergrative Plant Biology,2007,49:270-281.
[9] Atkin O,Scheurwater I,Pons T.High thermal acclimation potential of both photosynthesis and respiration in two lowland Plantago species in contrast to an alpine congeneric [J].Global Change Biology,2006,12:500-5015.
[10] Luo Y Q,Zhou X H.Soil Respiration and the Environment[M].San Diego,USA:Elsevier,2006.
[11] Knorr W,Prentice I C,Holland E A.Long-term sensitivity of soil carbon turnover to warming[J].Nature,2005,433:298-301.
[12] Davidson E A,Janssens I A.Temperature sensitivity of soil carbon decomposition and feedbacks to climate change[J].Nature,2006,440:165-169.
[13] Kirschbaum M F.The temperature dependence of soil organic mater decomposition,and the effect of global warming on soil organic C storage[J].Soil Biology and Biogeochemistry,1995,27:753-760.
[14] Kirschbaum M F.Soil respiration under prolonged soil warming:are rate reductions caused by acclimation or substrate loss?[J].Global Change Biology,2004,10:1870-1877.
[15] Kirschbaum M F.The temperature dependence of organic-matter decomposition-still a topic of debate[J].Soil Biology and Biochemistry,2006,38:2510-2518.
[16] Trumbore S E.Potential responses of soil organic carbon to global environmental change[J].Proceedings of the National Academy of Sciences,1997,94:8284-8291.
[17] Rustad L E,Campbell J L,Marion G M,et al.A meta-analysis of the response of soil respiration,net nitrogen mineralization,and aboveground plant growth to experimental ecosystem warming[J].Oecologia,2001,126:543-562.
[18] Lellei-Kovacs E,Kovacs-Lang E,Kalapos T,et al.Experimental warming does not enhance soil respiration in a semiarid temperate forest-steppe ecosystem[J].Community Ecology,2008,9:29-37.
[19] Saleska S,Harte K,Torn M.The effect of experimental ecosystem warming on CO2 fluxes in a montane meadow[J].Global Change Biology,1999,5:125-141.
[20] Oberbauer S F,Tweedie C E,Welker J M,et al.Tundra CO2 fluxes in response to experimental warming across latitudinal and moisture gradients [J].Ecological Monographs,2007,77:221-238.
[21] Luo Y Q,Wan S Q,Hui D F,et al.Acclimatization of soil respiration to warming in a tall grass prairie[J].Nature,2001,413:622-625.
[22] Eliasson P E,McMurtrie R E,Pepper D A,et al.The response of heterotrophic CO2 flux to soil warming[J].Global Change Biology,2005,11:167-181.
[23] Melillo J M,Steudler P A,Abler J D.Soil warming and carbon-cycle feedbacks to the climate system[J].Science,2002,298:2173-2175.
[24] Xia J,Han Y,Zhang Z,et al.Effects of diurnal warming on soil respiration are not equal to the summed effects of day and night warming in a temperate steppe[J].Biogeosciences,2009,6:1361-1370.
[25] 易志刚,蚁伟民,周丽霞.土壤各组分呼吸区分方法研究进展[J].生态学杂志,2003,22:65-69.
[26] Wan S Q,Luo Y Q.Substrate regulation of soil respiraton in a tallgrass prairie:results of a clipping and shading experiment[J].Global Biogeochemal Cycles,2003,doi:10.1029.2002GB001971.
[27] Zhou X H,Wan S Q,Luo Y Q.Source components and interannual variability of soil CO2 efflux under experimental warming and clipping in a grassland ecosystem[J].Global Change Biology,2007,13:761-775.
[28] Hanson P J,Edwards N T,Garten C T,et al.Separating root and soil microbial contributions to soil respiratin:a review of methods and observations[J].Biogeochemistry,2000,48:115-146.
[29] Graham S L,Millard P,Hunt J E,et al.Roots affect the response of heterotrophic soil respiration to temperature in tussock grass microcosms[J].Annals of Botany,2012,110(2):253-258.
[30] Giardina C P,Ryan M.Evidence that decomposition rates of organic carbon in mineral soil do not vary with temperature[J].Nature,2000,404:858-861.
[31] Davidson E A,Trumbore S E,Amundson R.Biogeochemistry:soil warming and organic carbon content[J].Nature,2000,408:789-790.
[32] Cox P M,Betts R A,Jones C D,et al.Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model[J].Nature,2000,408:184-187.
[33] Fang C M,Smith P,Moncrieff J B,et al.Similar response of labile and resistant soil organic matter pools to changes in temperature[J].Nature,2006,433:57-59
[34] Craine J,Fierer N,McLauchlan K.Widespread coupling between the rate and temperature sensitivity of organic matter decay[J].Nature Geoscience,2010,440:1-4.
[35] Conen F,Leifeld J,Seth B,Alewell C.Warming mobilises yong and old soil carbon equally[J].Biogeosciences,2006,3:1355-1366.
[36] Loik M E,Still C J,Huxman T E,et al.In situ photosynthetic freezing tolerance for plants exposed to a global warming manipulation in the Rocky Mountains,Colorado,USA[J].New Phytologist,2004,162:331-341.
[37] He W,Dong M.Plasticity in physiology and growth of Salix matsudana in response to simulated atmospheric temperature rise in the Mu Us Sandland[J].Photosynthetica,2003,41:297-300.
[38] Llorens L,Pe uelas J,Beier C,et al.Effects of an experimental increase of temperature and drought on the photosynthetic performance of two ericaceous shrub species along a north south European gradient[J].Ecosystems,2004,7:613-624.
[39] Gedan K,Bertness M.How will warming affect the salt marsh foundation species Spartina patens and its ecological role?[J].Oecologia,2010,164:479-487.
[40] Norby R J,Gunderson C A,Edwards N T.TACIT :temperature and CO2 interactions in trees.photosynthesis and growth[J].Ecological Society of American Bulliten,1995,76:197.
[41] Hobbie S E,Chapin F S.The response of tundra plant biomass,aboveground production,nitrogen and CO2 flux to experimental wamring[J].Ecology,1998,79:1526-1544.
[42] Arft A M,Walker M D,Gurevitch J,et al.Responses of tundra plants to experimental warming:meta-analysis of the international tundra experiment[J].Ecological Monographs,1999,69:491-511.
[43] Hudson J M G,Henry G H R.Increased plant biomass in a high arctic heath community from 1981 to 2008[J].Ecology,2009,90(10):2657-2663.
[44] Day T A,Ruhland C T,Xiong F S.Warming increases aboveground plant biomass and C stocks in vascular-plant-dominated Antarctic tundra[J].Global Change Biology,2008,14(8):1827-1843.
[45] Bloor J,Pichon P,Falcimagne R,et al.Effects of warming,summer drought,and CO2 enrichment on aboveground biomass production,flowering phenology,and community structure in an upland grassland ecosystem[J].Ecosystems,2010,13(6):888-900.
[46] Niu S L,Wu M Y,Han Y,et al.Water-mediated responses of ecosystem carbon fluxes to climatic change in a temperate steppe[J].New Phytologist,2008,177:209-219.
[47] Huemmrich K F,Kinoshita G,Gamon J A,et al.Tundra carbon balance under varying temperature and moisture regimes[J].Journal Geophysical Research-Biogeoscience,2010,115(G4):JG001237.
[48] Marchand F L,Nijs I,de Boeck H,et al.Increased turnover but little change in the carbon balance of high-arctic tundra exposed to whole growing season warming[J].Arctic,Antarcticand Alpine Research,2004,36:298-307.
[49] Saleska S R,Shaw M R,Fischer M L,et al.Plant community composition mediates both large transient decline and predicted long-term recovery of soil carbon under climate warming[J].Global Biogeochemical Cycles,2002,16(4):1-18.
[50] Kwon H J,Oechel W C,Zulueta R C,et al.Effects of climate variability on carbon sequestration among adjacent wet sedge tundra and moist tussock tundra ecosystems[J].Journal of Geophysical Research:Biogeosciences,2006,111(G3):JG000036.
[51] Wu Z T,Dijkstra P,Koch G W,et al.Responses of terrestrial ecosystems to temperature and precipitation change:a meta-analysis of experimental manipulation[J].Global Change Biology,2011,17(2):927-942.
[52] Niu S L,Sherry R,Zhou X H,et al.Nitrogen regulation of the climate-carbon feedback:evidence from a long-term global change experiment[J].Ecology,2010,91:3261-3273.
[53] 任书杰,曹明奎,陶波,等.陆地生态系统氮状态对碳循环的限制作用研究进展[J].地理科学进展,2006,25:58-67.
[54] Rastetter E B,Agren G I,Shaver G R.Responses of N-limited ecosystem to increased CO2:a balanced nutrition coupled element cycles model[J].Ecological Applications,1997,7(2):444-460.
[55] Wan S Q,Hui D F,Wallace L L,et al.Direct and indirect effects of experimental warming on ecosystem carbon processes in a tallgrass prairie[J].Global Biogeochemical Cycles,2005,19(2):GB002315.
[56] Andresen L C,Michelsen A,Ambus P,et al.Belowground heathland responses after 2 years of combined warming,elevated CO2 and summer drought[J].Biogeochemistry,2010,101:27-42.
[57] Schmidt I K,Jonasson S,Shaver G R,et al.Mineralization and distribution of nutrients in plants and microbes in four arctic ecosystems:responses to warming [J].Plant and Soil,2002,242(1):93-106.
[58] Sparks T H,Menzel A.Observed changes in seasons:an overview[J].International Journal of Climatology,2002,22:1715-1725.
[59] Menzel A,Sparks T H,Estrella N,et al.European phenological response to climate change matches the warming pattern[J].Global Change Biology,2006,12(10):1969-1976.
[60] Bradley N L,Leopold A C,Ross J,et al.Phenological changes reflect climate change in Wisconsin[J].Proceedings of the National Academy of Sciences,1999,96:9701-9704.
[61] Yu H,Luedeling E,Xu J.Winter and spring warming result in delayed spring phenology on the Tibetan Plateau[J].Proceedings of the National Academy of Sciences.2010,107(51):22151-22156.
[62] Bertin R I.Plant phenology and distribution in relation to recent climate change[J].The Journal of the Torrey Botanical Society,2008,135(1):126-146.
[63] White M A,Running S W,Thornton P E.The impact of growing-season length variability on carbon assimilation and evapotranspiration over 88 years in the eastern US deciduous forest[J].International Journal of Biometeorology,1999,42(3):139-145.
[64] Euskirchen E S,McGuire A D,Kicklighter D W,et al.Importance of recent shifts in soil thermal dynamics on growing season length,productivity,and carbon sequestration in terrestrial high-latitude ecosystems[J].Global Change Biology,2006,12(4):731-750.
[65] Moriondo M,Bindi M.Impact of climate change on the phenology of typical mediterranean crops[J].Italian Journal of Agrometeorology,2007:1-8.
[66] Couteaux M M,Bottner P,Berg B.Litter decomposition,climate and litter quality[J].Tree Physiology,1995,10:63-66.
[67] Chapin III F S,Randerson J,McGuire A,et al.Changing feedback in the climate-biosphere system[J].Front Ecology Environment,2008,6:313-320.
[68] Xu G P,Hu Y G,Wang S P,et al.Effects of litter quality and climate change along an elevation gradient on litter mass loss in an alpine meadow ecosystem on the Tibetan plateau[J].Plant Ecology,2010,209(2):257-268.
[69] Shaw M R,Harte J.Response of nitrogen cycling to simulated climate change:differential responses along a subalpine ecotone[J].Global Change Biology,2001,7(2):193-210.
[70] Montan F,Romany J,Rovira P,et al.Aboveground litter quality changes may drive soil organic carbon increase after shrub encroachment into mountain grasslands[J].Plant and Soil,2010,337(1):151-165.
[71] Gentile R,Vanlauwe B,Six J.Litter quality impacts short-but not long-term soil carbon dynamics in soil aggregate fractions[J].Ecological Applications,2011,21:695-703.
[72] Cheng X L,Luo Y Q,Su O,et al.Experimental warming and clipping altered litter carbon and nitrogen dynamics in a tallgrass prairie[J].Agricultural and Forest Meteorology,2010,138:206-213.
[73] Sjgersten S,Wookey P A.Decomposition of mountain birch leaf litter at the forest-tundra ecotone in the Fennoscandian mountains in relation to climate and soil conditions[J].Plant and Soil,2004,262(1):215-227.
[74] Klein J,Harte J,Zhao X.Experimental warming causes large and rapid species loss,dampened by simulated grazing,on the Tibetan Plateau[J].Ecology Letters,2004,7:1170-1179.
[75] Kardol P,Campany C E,Souza L,et al.Climate change effects on plant biomass alter dominance patterns and community evenness in an experimental old-field ecosystem[J].Global Change Biology,2010,16:2676-2687.
[76] Kardol P,Cregger M A,Campany C E,et al.Soil ecosystem functioning under climate change:plant species and community effects[J].Ecology,2010,91:767-781.
[77] Sturm M,Racine C,Tape K.Climate change.Increasing shrub abundance in the Arctic[J].Nature,2001,411:546-547.
[78] Hobbie S E.Temperature and plant species control over litter decomposition in Alaskan Tundra[J].Ecological Monographs,1996,66(4):503-522.
[79] 李娜,王根绪,杨燕,等.短期增温对青藏高原高寒草甸植物群落结构和生物量的影响[J].生态学报,2011,31:895-905
[80] Schuur E A G,Vogel J G,Crummer K G,et al.The effect of permafrost thaw on old carbon release and net carbon exchange from tundra[J].Nature,2009,459:556-559.
[81] Tarnocai C,Canadell J G,Schuur E.A.G.,et al.Soil organic carbon pools in the northern circumpolar permafrost region[J].Global Biogeochemistry Cycles,2009,23:2023-2034.
[82] Wang G X,Li Y S,Wang Y B,et al.Effects of permafrost thawing on vegetation and soil carbon losses on the Qinghai-Tibet Plateau,China[J].Geoderma,2008,143:143-152.
[83] Koven C D,Ringeval B,Friedlingstein P,et al.Permafrost carbon-climate feedbacks accelerate global warming[J].Proceedings of the National Academy of Sciences,2011,108:14769-14774.
[84] Goulden M,Wofsy S,Harden J,et al.Sensitivity of boreal forest carbon balance to soil thaw[J].Science,1998,279,214-217.
[85] Burke E J,Jones C D,Koven C D.Estimating the permafrost carbon climate responses in the CMIP5 climate models using a simplified approach[J].Journal of Climate,2013,26(6)1877-1900.
[86] Dutta K,Schuur E A G,Neff J C,et al.Potential carbon release from permafrost soils of Northeastern Siberia[J].Global Change Biology,2006,12:1-16.
[87] MacDougall A H,Avis C A,Weaver A J.Significant contribution to climate warming from the permafrost carbon feedback[J].Nature Geoscience,2012,5:719-721.
[88] Natali S M,Schuur E A G,Trucco C,et al.Effects of experimental warming of air,soil and permafrost on carbon balance in Alaskan tundra[J].Global Change Biology,2011,17:1394-1407.
[89] Ding M J,Zhang Y L,Sun X M,et al.Spatiotemporal variation in alpine grassland phenology in the Qinghai-Tibetan Plateau from 1999 to 2009[J].Chinese Science Bulletin,2013,58(3):384-395.
[90] Jonasson S,Michelsen A,Schmidt I K,et al.Responses in microbes and plants to changed temperature,nutrient,and light regimes in the arctic[J].Ecology,1999,80:1828-1843.