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时间:2020-06-04
《极端干旱区增雨加速泡泡刺群落土壤碳排放.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第32卷第l7期生态学报Vo1.32.No.172012年9月ACTAECOLOGICASINICASep.,2012DOI:10.5846/stxb201202080161刘殿君,吴波,李永华,朱雅娟,卢琦.极端干旱区增雨加速泡泡刺群落土壤碳排放.生态学报,2012,32(17):5396—5404.uuDJ,wuB,LiYH,ZhuYJ,LuQ.Rainenrichment—acceleratedcarbonemissionsfromsoilinaNitrariasphaerocarpacommunityinhyperaridregionActaEc
2、ologicaSinica,2012,32(17):5396-5404.极端干旱区增雨加速泡泡刺群落土壤碳排放刘殿君,吴波,李永华,朱雅娟,卢琦(中国林业科学研究院荒漠化研究所,国家林业局林木培育重点实验室,北京100091)摘要:以极端干旱区(敦煌)泡泡刺群落为研究对象,采用动态气室法(Li.8100,USA)于2010年5月至9月测定分析了生长季内增雨对泡泡刺群落土壤碳排放量的影响。结果表明:裸地和灌丛在09:00—11:00的碳排放量与全天碳排放量具有线性正相关关系(裸地R0.31~0.76,P<0.001;灌丛R0.85—0.96,P<0.001
3、)。增雨50%(4mil1)一300%(24mm)能够加速裸地和灌丛土壤的碳排放,每增雨1mm,裸地和灌丛土壤的碳排放分别增加0.27和1.12g/m。当泡泡刺群落盖度一定时,与对照相比,每增加1mm降雨,泡泡刺群落土壤碳排放量增加0.69g/in。在未来中国西北干旱地区降雨增加背景下,这一研究数据将为进一步估算该区域群落或生态系统碳收支提供可靠的参考数据。关键词:人工模拟增雨;极端干旱区;土壤碳排放量;泡泡刺Rainenrichment·acceleratedcarbonemissionsfromsoilinaNitrariasphaerocarpac
4、ommunityinhyperaridregionLIUDianjun,WUBo,LIYonghua,ZHUYajuan,LUQiInstituteofDesertifcationStudies,ChineseAcademyofForestry,KeyLaboratoryofTreebreadingandcultivationofStateForestryAdministration,Beijing100091,ChinaAbstract:Ourpreviousresearchshowedanincreasingtrendofrainfallinatem
5、peratearidregionofChina.Inthisstudy,toaddresspotentialeffectsofadditionalrainoncarbonemissionsofanaridecosystem,weconductedafieldmanipulativeexperimentwithfivesimulatedrainadditiontreatments(fourrainadditiontreatmentsandoneforcomparison).Eachtreatmentincludedfourrepetitiveplots,e
6、achwithanareaofapproximately113m,inDunHuang,Gansu.Thedesignsimulatedrainincreasesof0%(CK),50%,100%,200%and300%ofthelong—term(1978-2008)averageannualprecipitation(40mm)atthestudysite.WeusedtheLi一8100automatedsoilCO2fluxsysteminaNitrariasphaerocarpacommunityduringthegrowingseason,f
7、romMaytoSeptember2010.Ourresultsshowedalinearpositivecorrelationinsoilcarbonemissionsbetween09:00一l1:00and24:00hoursforvegetatedandbaresoil(baresoilR=0.31—0.76,P<0.001;vegetatedsoilR=0.85—0.96,P<0.001).Therainincreasesacceleratedvegetatedandbaresoilrespirationintheplots.Comparedw
8、iththecontrolgroup,soilcarbonemissionsof
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