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时间:2019-06-02
《长白山阔叶红松林树木N2O排放及总量初步估算》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、生态学杂志ChineseJournalofEcology2004,23(5):232~235长白山阔叶红松林树木N2O排放及总量初步估算*张秀君徐慧¨陈冠雄(中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳110016;沈阳大学师范学院,沈阳110016)摘要大气中主要温室气体N20的部分来源尚不清楚。以往国内外对森林生态系统N0排放通量的测定中,只测土壤通量而把树木排除在外。如果树木在自然状态下能排放N,0,那么森林生态系统的N,0排放可能被低估。本文旨在证明自然状态下森林生态系统中树木也是N,0的主要排放源。采用封
2、闭罩法,在树木生长的主要季节(7~9月)对长白山阔叶红松林的几个主要树种——水曲柳、红松和椴树的连体枝叶释放N,0的速率进行了原位测定。并在此基础上,初步估算出森林树木N20年排放量是土壤N20年排放量的0.8~1.03倍,相当于甚至超过了土壤的N'0排放量。关键词树木,N0排放,森林生态系统,总量估算中图分类号Q148文献标识码A文章编号1000—4890(2004)05—0232—04N2OemissionandpreliminaryestimationofannualN20emissionfromtreesinmixed
3、broad.1eavedandKoreanpineforestofChangbaiMountain.ZHANGXi~un一,XUHui,CHENGuanxiong(KeyLaboratoryofTerrestrialEcologicalProcess,InstituteofAppliedEcology,ChineseAcademyofSciences,Shenyang110016,China;ShenyangCollegeofEducation,Shenyang110016,Chi—na).ChineseJournalofEc
4、ology,2004,23(5):232~235.ThesourcesofN20,oneofthemajorgreenhousegasesintheatmosphere,arestilluncleartillnOW.ItwaspreviouslyconsideredthatonlysoilmicrobialprocessproducedN20.InpreviousstudiesonN2Oemissionfromforestecosystems。onlymeasurementsofN2Oemissionfromsoi1werec
5、onducted.ThetOtalN20emissionfromforestecosystemmaybeunderestima*.edifplantscanemitN,Oundernatu—ratcondition.TheaimofthisstudyWastoprovideevidencesthatplantperse。besidesforestsoil。iSalsoanimportantsourceoftheatmosphericN20inaforestecosystem.Usingtheclosedbagtech—niqu
6、e.theinsitumeasurementsofN2Oemissionsfrombranchesand1eavesofFraxinusmandshuri—ca.PinnuskoraiensisandTiliaamurrensiswereconductedinamixedbroad—leavedKoreanpinefor—est.ThecontributionofN2OemissionfromtreesinforestecosystemswasfirstlyestimatedbasedonN2Oemissionratesfro
7、mthesethreetreespeciesandsoi1inmixedbroad—leavedKoreanpineforest.TheannualaverageofN,Oemissionsfromtreesinmixedbroad—leavedKoreanpineforestwas0.8~1.03timesofthatfromsoi1.ItWasfoundthatN2OemissionfromtreeswereequaltOorhigherthanN1Oemissionfromforestsoil.Keywordstree,
8、N20emission,forestecosystem,estimation以往认为,土壤微生物的硝化、反硝化作用是土1引言壤N,O的唯一生物源。但近年来有报道显示植物N2O是一种重要的温室效应气体,其单分子增也能释放N2O,陈冠雄等l3J首次报道植物在正常生理状态下能排放N
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