Effects of the extreme drought in 2003 on soil respiration in a mixed forest.pdf

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1、EurJForestRes(2009)128:87Ð98DOI10.1007/s10342-008-0218-6ORIGINALPAPEREffectsoftheextremedroughtin2003onsoilrespirationinamixedforestPetiaS.NikolovaÆStephanRaspeÆChristianP.AndersenÆRaphaelMainieroÆHelmutBlaschkeÆRainerMatyssekÆKarl-HeinzHa¨berleReceived:2July2007/Revised:21March2008/Accept

2、ed:9May2008/Publishedonline:17July2008ÓSpringer-Verlag2008AbstractWepresentaÞeldstudyonthedroughteffectsandbeech.Throughoutthestudyperiod,SRaofbeechontotalsoilrespiration(SRt)anditscomponents,i.e.,accountedfor45Ð55%ofSRt,independentofthesoilwaterÔÔautotrophicÕÕ(SRa:byroots/mycorrhizosphere

3、)andÔÔhetero-regime;incontrast,SRawassigniÞcantlyreducedduringtrophicÕÕrespiration(SRh:bymicroorganismsandsoildroughtinspruce,andamountedthentoonly25%ofSRt.Infaunainbulksoil),inamatureEuropeanbeech/Norwayparallel,Þne-rootproductionwasdecreasedduring2003by-1-1spruceforest.SRaandSRhweredisti

4、nguishedunderneathafactorofsixinspruce(from750to130mgla),butgroupsofbeechandsprucetreesusingtherootexclusionremainedatlevelssimilartothosein2002inbeech(about-1-1method.SeasonalcoursesofSRaandSRhwerestudiedfrom470mgla).Thisspecies-speciÞcrootresponseto2002to2004,withthesummerof2003beingextr

5、aordi-droughtwasrelatedtoastrongerdeclineofSRainsprucenarilywarmanddryinCentralEurope.We(1)analyzedthe(byabout70%)comparedtobeech(byabout50%).Thesoiltemperature(Ts)andmoisturesensitivityofSRaandsensitivityofSRaandSRhtochangingTsandavailablesoilSRhunderneathbothtreespecies,and(2)examinedwhe

6、therwaterwasstrongerinSRathanSRhinspruce,butnotsoindroughtcauseddifferentialdeclineofSRabetweensprucebeech.ItisconcludedthatSRadeterminestheeffectofprolongeddroughtontheCefßuxfromsoiltoalargerextentinsprucethanbeech,havingpotentialimplicationsCommunicatedbyA.Roloff.forrespectiveforesttypes

7、.ThisarticlebelongstothespecialissueÔÔGrowthanddefenceofNorwayspruceandEuropeanbeechinpureandmixedstands.ÕÕKeywordsFagussylvatica
Piceaabies
Soilrespirationcomponents
Wateravailibility
P.S.Nikolova
H.Blaschke
R.Matyssek
K.-H.Ha¬berle(&)Temperature
Rootexclusio