Mid-subtropicalforestsarethemainvegetationtypeofglobalterrestrialbiomes,andarecriticalformaintainingtheglobalcarbonbalance.However,estimatesofforestbiomassincrementinmid-subtropicalforestsremainhighlyuncertain.Itiscriticallyimportanttodeterminetherelativeimportanceofdifferentbioticandabioticfactorsbetweenplantsandsoil,particularlywithrespecttotheirinfluenceonplantregrowth.Consequently,itisnecessarytoquantitativelycharacterizethedynamicspatiotemporaldistributionofforestcarbonsinksataregionalscale.Thisstudyusedalarge,long-termdatasetinaboostedregressiontree(BRT)modeltodeterminethemajorcomponentsthatquantitativelycontrolforestbiomassincrementsinamid-subtropicalforestedregion(WuyishanNationalNatureReserve,China).Long-term,stand-leveldatawereusedtoderivetheforestbiomassincrement,withtheBRTmodelbeingappliedtoquantifytherelativecontributionsofvariousbioticandabioticvariablestoforestbiomassincrement.Ourdatashowthattotalbiomass(t)increasedfrom4.629106to5.309106tbetween1988and2010,andthatthemeanbiomassincreasedfrom80.19±0.39tha-1(mean±standarderror)to94.33±0.41tha-1inthestudyregion.Themajorfactorsthatcontrolledbiomass(indecreasingorderofimportance)werethestand,topography,andsoil.Standdensitywasinitiallythemostimportantstandfactor,whileelevationwasthemostimportanttopographicfactor.Soilfactorswereimportantforforestbiomassincrementbuthaveamuchweakerinfluencecomparedtotheothertwocontrollingfactors.Theseresultsprovidebaselineinformationaboutthepracticalutilityofspatialinterpolationmethodsformappingforestbiomassincrementsatregionalscales.更多还原
