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极端干旱对若尔盖高原泥炭地生态系统CO2通量的影响

  • 张远 ,
  • 郝彦宾 ,
  • 崔丽娟 ,
  • 李伟 ,
  • 张骁栋 ,
  • 张曼胤 ,
  • 李林峰 ,
  • 杨思 ,
  • 康晓明
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  • 1. 中国科学院大学生命科学学院, 北京 100049;
    2. 中国林业科学研究院湿地研究所湿地生态功能与恢复北京市 重点实验室, 北京 100091;
    3. 四川若尔盖高寒湿地生态系统定位观测研究站, 四川 阿坝藏族自治州 624500

收稿日期: 2016-06-12

  修回日期: 2016-09-15

  网络出版日期: 2017-07-15

基金资助

中国林业科学研究院林业新技术研究所基本科研业务费专项(CAFINT2014K06)、国家重点研发计划项目(2016YFC0501804)、国家自然科学基金(31300417)和中央级公益性科研院所基本科研业务费专项(CAFYBB2014QB026)资助

Effects of extreme drought on CO2 fluxes of Zoige alpine peatland

  • ZHANG Yuan ,
  • HAO Yanbin ,
  • CUI Lijuan ,
  • LI Wei ,
  • ZHANG Xiaodong ,
  • ZHANG Manyin ,
  • LI Linfeng ,
  • YANG Si ,
  • KANG Xiaoming
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  • 1. College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    2. Beijing Key Laboratory of Wetland Services and Restoration, Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China;
    3. Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, Sichuan, China

Received date: 2016-06-12

  Revised date: 2016-09-15

  Online published: 2017-07-15

摘要

采用野外控制试验和静态箱法,研究极端干旱事件对若尔盖高原泥炭地净生态系统二氧化碳交换(net ecosystem CO2 exchange, NEE)、生态系统呼吸(ecosystem respiration, Re)和总初级生产力(gross primary productivity, GPP)的影响及其响应机制。研究结果表明:极端干旱显著降低若尔盖高原泥炭地生态系统的NEE、Re和GPP(P<0.05),导致生态系统固碳能力减弱,而温度(空气温度和土壤温度)和土壤含水量(SWC)是若尔盖高原泥炭地碳收支变化的主要驱动因子。在对照处理(CK)和极端干旱处理(D)中,NEE、Re和GPP与空气温度呈显著正相关关系(P<0.05),极端干旱减弱NEE、Re和GPP对空气温度变化的敏感性。表层土壤温度与NEE、Re和GPP的相关性高于深层土壤温度与NEE、Re和GPP的相关性。分析5 cm土壤温度与NEE和Re的相关关系。极端干旱减弱NEE对5 cm土壤温度的敏感性,增强Re对5 cm土壤温度的敏感性。若尔盖高原泥炭地生态系统NEE、Re和GPP与土壤含水量显著正相关(P<0.05),而极端干旱对土壤全碳、全氮和有机碳的含量无显著影响(P > 0.05)。

本文引用格式

张远 , 郝彦宾 , 崔丽娟 , 李伟 , 张骁栋 , 张曼胤 , 李林峰 , 杨思 , 康晓明 . 极端干旱对若尔盖高原泥炭地生态系统CO2通量的影响[J]. 中国科学院大学学报, 2017 , 34(4) : 462 -470 . DOI: 10.7523/j.issn.2095-6134.2017.04.008

Abstract

To study the effects of extreme drought on net ecosystem CO2 exchange (NEE), ecosystem respiration (Re), and gross primary productivity (GPP) of Zoige alpine peatland, the carbon fluxes in both extreme drought treatment (D) and control treatment (CK) were monitored by using static enclosed chamber technique in a control platform of extreme climate event. The results showed that extreme drought significantly decreased NEE, Re, and GPP (P<0.05) of Zoige alpine peatland and hence reduced the carbon fixation capacity of targeted ecosystem. We also found that temperatures (air temperature (Ta) and soil temperature (Ts)) and soil water content (SWC) were the main driving factors of carbon budget dynamics in Zoige alpine peatland. NEE, Re, and GPP were significantly positively correlated with air temperature (P < 0.05), and their sensitivity to the Ta change was weakened by extreme drought. The correlations of NEE, Re, and GPP with topsoil temperature were much stronger than those with subsoil temperature. Besides, we found that extreme drought reduced the sensitivity of NEE to soil temperature at depth of 5 cm, but strengthened the sensitivity of Re. Furthermore, NEE, Re, and GPP were significantly positively correlated with soil water content (P<0.05). However, extreme drought had no significant effect on soil total carbon, nitrogen, and soil organic carbon contents (P>0.05).

参考文献

[1] Reichstein M, Bahn M, Ciais P, et al. Climate extremes and the carbon cycle [J]. Nature, 2013, 500(7 462): 287-295.
[2] IPCC. Climate change 2007: the physical science basis [M]. New York: Cambridge University Press. 2007.
[3] Jiang Z, Song J, Li L, et al. Extreme climate events in China: IPCC-AR4 model evaluation and projection [J]. Climatic Change, 2012, 110(1/2): 385-401.
[4] Smith M D. The ecological role of climate extremes: current understanding and future prospects [J]. Journal of Ecology, 2011, 99(3): 651-655.
[5] Mitsch W J, Bernal B, Nahlik A M, et al. Wetlands, carbon, and climate change [J]. Landscape Ecology, 2012, 28(4): 583-597.
[6] Jentsch A, Kreyling J, Elmer M, et al. Climate extremes initiate ecosystem-regulating functions while maintaining productivity [J]. Journal of Ecology, 2011, 99(3): 689-702.
[7] Smith M D, Knapp A K, Collins S L. A framework for assessing ecosystem dynamics in response to chronic resource alterations induced by global change[J]. Ecology, 2009, 90(12): 3 279-3 289.
[8] Tian H, Hall C, Qi Y. Modeling primary productivity of the terrestrial biosphere in changing environments: toward a dynamic biosphere model [J]. Critical Reviews in Plant Sciences, 1998, 17(5): 541-557.
[9] Rajan N, Maas S J, Cui S. Extreme drought effects on carbon dynamics of a semiarid pasture [J]. Agronomy Journal, 2013, 105(6): 1 749.
[10] Huntingford C, Lowe J A, Booth B B B, et al. Contributions of carbon cycle uncertainty to future climate projection spread [J]. Tellus Series B-Chemical and Physical Meteorology, 2009, 61(2): 355-360.
[11] Frolking S, Roulet N T, Moore T R, et al. Modeling northern peatland decomposition and peat accumulation [J]. Ecosystems, 2001, 4(5): 479-498.
[12] Inubushi K, Furukawa Y, Hadi A, et al. Seasonal changes of CO2, CH4 and N2O fluxes in relation to land-use change in tropical peatlands located in coastal area of South Kalimantan [J]. Chemosphere, 2003, 52(3): 603-608.
[13] Bridgham S D, Moore T R, Richardson C J, et al. Errors in greenhouse forcing and soil carbon sequestration estimates in freshwater wetlands: a comment on Mitsch et al. (2013) [J]. Landscape Ecology, 2014, 29(9): 1 481-1 485.
[14] Hao Y B, Cui X Y, Wang Y F, et al. Predominance of precipitation and temperature controls on ecosystem CO2 exchange in Zoige alpine wetlands of Southwest China [J]. Wetlands, 2011, 31(2): 413-422.
[15] Zhou L, Zhou G S, Jia Q Y. Annual cycle of CO2 exchange over a reed (Phragmites australis) wetland in Northeast China [J]. Aquatic Botany, 2009, 91(2): 91-98.
[16] Polsenaere P, Lamaud E, Lafon V, et al. Spatial and temporal CO2 exchanges measured by eddy covariance over a temperate intertidal flat and their relationships to net ecosystem production [J]. Biogeosciences, 2012, 9(1): 249-268.
[17] Wassmann R, Aulakh M S. The role of rice plants in regulating mechanisms of methane missions [J]. Biology and Fertility of Soils, 2000, 31(1): 20-29.
[18] Pitchford J L, Wu C, Lin L, et al. Climate change effects on hydrology and ecology of wetlands in the mid-Atlantic highlands [J]. Wetlands, 2011, 32(1): 21-33.
[19] 王德宣. 若尔盖高原泥炭沼泽二氧化碳、甲烷和氧化亚氮排放通量研究[J]. 湿地科学, 2010, 8(3): 220-224.
[20] 张晓云,吕宪国,顾海军. 若尔盖湿地面临的威胁、保护现状及对策分析[J]. 湿地科学, 2005, 3(4): 292-297.
[21] 刘红玉. 中国湿地资源特征、现状与生态安全[J]. 资源科学, 2005, 27(3): 54-60.
[22] 李珂,杨永兴,杨杨,等. 放牧胁迫下若尔盖高原沼泽退化特征及其影响因子[J]. 生态学报, 2011, 31(20): 5 956-5 969.
[23] Hao Y B, Kang X M, Cui X Y, et al. Verification of a threshold concept of ecologically effective precipitation pulse: from plant individuals to ecosystem [J]. Ecological Informatics, 2012, 12(11): 23-30.
[24] 孙晓新,牟长城,石兰英,等. 小兴安岭森林沼泽甲烷排放及其影响因子[J]. 植物生态学报, 2009, 33(3): 535-545.
[25] Mastepanov M, Sigsgaard C, Dlugokencky E J, et al. Large tundra methane burst during onset of freezing [J]. Nature, 2008, 456(7 222): 628-658.
[26] Mueller R C, Scudder C M, Porter M E, et al. Differential tree mortality in response to severe drought: evidence for long-term vegetation shifts [J]. Journal of Ecology, 2005, 93(6): 1 085-1 093.
[27] Ciais P, Reichstein M, Viovy N, et al. Europe-wide reduction in primary productivity caused by the heat and drought in 2003 [J]. Nature, 2005, 437(7 058): 529-533.
[28] Schwalm C R, Williams C A, Schaefer K, et al. Assimilation exceeds respiration sensitivity to drought: a FluxNet synthesis [J]. Global Change Biology, 2010, 16(2): 657-670.
[29] Shi Z, Thomey M L, Mowll W, et al. Differential effects of extreme drought on production and respiration: synthesis and modeling analysis [J]. Biogeosciences, 2014, 11(3): 621-633.
[30] Kang X, Hao Y, Li C, et al. Modeling impacts of climate change on carbon dynamics in a steppe ecosystem in Inner Mongolia, China [J]. Journal of Soils and Sediments, 2011, 11(4): 562-576.
[31] Miranda A C, Miranda H S, Lloyd J, et al. Fluxes of carbon, water and energy over Brazilian cerrado: an analysis using eddy covariance and stable isotopes [J]. Plant Cell and Environment, 1997, 20(3): 315-328.
[32] Welker J M, Brown K B, Fahnestock J T. CO2 flux in Arctic and alpine dry tundra: comparative field responses under ambient and experimentally warmed conditions [J]. Arctic Antarctic and Alpine Research, 1999, 31(3): 272-277.
[33] Zhang Y, Grant R F, Flanagan L B, et al. Modelling CO2 and energy exchanges in a northern semiarid grassland using the carbon-and nitrogen-coupled Canadian Land Surface Scheme (C-CLASS) [J]. Ecological Modelling, 2005, 181(4): 591-614.
[34] Hunt J E, Kelliher F M, McSeveny T M, et al. Evaporation and carbon dioxide exchange between the atmosphere and a tussock grassland during a summer drought [J]. Agricultural and Forest Meteorology, 2002, 111(1): 65-82.
[35] Parton W J, Scurlock J M O, Ojima D S, et al. Impact of climate-change on grassland production and soil carbon worldwide [J]. Global Change Biology, 1995, 1(1): 13-22.
[36] Schimel D S, Kittel T G F, Parton W J. Terrestrial biogeochemical cycles: global interactions with the atmosphere and hydrology [J]. Tellus Series A-Dynamic Meteorology and Oceanography, 1991, 43(4): 188-203.
[37] Schimel D S, Parton W J, Kittel T G F, et al. Grassland biogeochemistry: links to atmospheric processes [J]. Climatic Change, 1990, 17(1): 13-25.
[38] 王东启,陈振楼,王军,等. 夏季长江口潮间带CH4、CO2和N2O通量特征[J]. 地球化学, 2007, 36(1): 78-88.
[39] Ding W, Cai Z, Tsuruta H, et al. Key factors affecting spatial variation of methane emissions from freshwater marshes [J]. Chemosphere, 2003, 51(3): 167-173.
[40] 刘乙,胡海波,刘准桥. 北亚热带次生栎林生态系统非生长季CO2通量特征[J]. 东北林业大学学报, 2013, 41(7): 22-27.
[41] 徐世晓,赵亮,李英年,等. 温度对青藏高原高寒灌丛CO2通量日变化的影响[J]. 冰川冻土, 2007, 29(5): 717-721.
[42] 宋长春,王毅勇. 湿地生态系统土壤温度对气温的响应特征及对CO2排放的影响[J]. 应用生态学报, 2006, 17(4): 4 625-4 629.
[43] van Straaten O, Veldkamp E, Köhler M, et al. Spatial and temporal effects of drought on soil CO2 efflux in a cacao agroforestry system in Sulawesi, Indonesia [J]. Biogeosciences, 2010, 7(4): 1 223-1 235.
[44] van der Molen M K, Dolman A J, Ciais P, et al. Drought and ecosystem carbon cycling [J]. Agricultural and Forest Meteorology, 2011, 151(7): 765-773.
[45] Lefi E, Medrano H, Cifre J. Water uptake dynamics, photosynthesis and water use efficiency in field-grown Medicago arborea and Medicago citrina under prolonged Mediterranean drought conditions [J]. Annals of Applied Biology, 2004, 144(3): 299-307.
[46] Lafleur P M, Moore T R, Roulet N T, et al. Ecosystem respiration in a cool temperate bog depends on peat temperature but not water table [J]. Ecosystems, 2005, 8(6): 619-629.
[47] Updegraff K, Bridgham S D, Pastor J, et al. Response of CO2 and CH4 emissions from peatlands to warming and water table manipulation [J]. Ecological Applications, 2001, 11(2): 311-326.
[48] Waddington J M, Rotenberg P A, Warren F J. Peat CO2 production in a natural and cutover peatland: Implications for restoration [J]. Biogeochemistry, 2001, 54(2): 115-130.
[49] 杨敏生,裴保华,朱之悌. 白杨双交杂种无性系抗旱性鉴定指标分析[J]. 林业科学, 2002, 38(6): 36-42.
[50] Schimel J, Balser T C, Wallenstein M. Microbial stress-response physiology and its implications for ecosystem function [J]. Ecology, 2007, 88(6): 1 386-1 394.
[51] Bloor J M G, Bardgett R D. Stability of above-ground and below-ground processes to extreme drought in model grassland ecosystems: interactions with plant species diversity and soil nitrogen availability [J]. Perspectives in Plant Ecology, Evolution and Systematics, 2012, 14(3): 193-204.
[52] Vance C P, Uhde-Stone C, Allan D L. Phosphorus acquisition and use: critical adaptations by plants for securing a nonrenewable resource [J]. New Phytologist, 2003, 157(3): 423-447.
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