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1、JournalofAridEnvironments(2002)50:205218doi:10.1006/jare.2001.0902,availableonlineathttp://www.idealibrary.comonCarbonstorageingrasslandsofChina%JianNiwz%MaxPlanckInstituteforBiogeochemistry,CarlZeissPromenade10,P.O.Box100164,D-07701Jena,GermanywLaboratoryofQuantitativeVegetationEcology,InstituteofB
2、otany,ChineseAcademyofSciences,XiangshanNanxincun20,100093Beijing,China(Received15September2000,accepted26June2001)CarbonstorageingrasslandsofChinawasestimatedbythecarbondensitymethodandbasedonanationwidegrasslandresourcesurveyfinishedby1991.ThegrasslandsinChinawereclassifiedinto18types,whicharedist
3、ributedmostlyinthetemperateregionandontheTibetanPlateau,andscatteredinthewarm-temperateandtropicalregions.Basedonthemedianestimate,vegetation,soilandtotalcarbonstorageofgrasslandsinChinawere3?06,41?03and44?09PgC,respectively.Vegetationhadlowcarbonstorageandmostcarbonwasstoredinsoils.Ofthefourtypesof
4、regionsthathavegrasslands,alpineregion(54?5%)andtemperateregion(31?6%)holdmorethan85%ofthetotalgrasslandcarbon(inbothvegetationandsoils)inChina.Consideringspecifictypeswithinthesetworegions,threegrasslandtypes,alpinemeadow(25?6%),alpinesteppe(14?5%)andtemperatesteppe(11%)constitutedmorethanhalfofall
5、carbonstoredinChinasgrasslands.Ingeneralandregardlessofregionalvegetationtypes,steppes(38?6%)andmeadows(38?2%)madeupmorethan2/3oftotalgrasslandcarbon.Thecarbonstorageinalpinegrasslandsmayhaveasignificantandlong-livedeffectonglobalCcycles.Thisstudyestimatedmorecarbonstorageinvegetationandlessinsoilst
6、hanpreviousstudies.Thedifferencesofgrasslandcarbonbetweenthisstudyandtwopreviousstudiesweredueprobablytofourreasons,i.e.differentestimationmethods,differentclassificationsystemsofgrasslands,differentareasofgrasslands,anddifferentcarbondensities.Chinasgrasslandscoveronly68%oftotalworldgrasslandareaan
7、dhave916%oftotalcarbonintheworldgrasslands.Theymakeabigcontributiontotheworldcarbonstorageandmayhavesignificanteffectsoncarboncycles,bothinglobalandinaridlands.#2002ElsevierScienceLtd.Keywords:carbons
