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黄河下游灌区土壤碳储量、分布及影响因素研究.docx

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黄河下游灌区土壤碳储量、分布及影响因素研究 Abstract Soilcarbonisanimportantcomponentoftheglobalcarboncycleandplaysanimportantroleinregulatingglobalclimatechange.Inthisstudy,weinvestigatedthesoilcarbonstorage,distributionandinfluencingfactorsinthedownstreamirrigationareaoftheYellowRiver.Theresultsshowedthatthemeansoilcarbonstorageinthestudyareawas33.97MgCha-1,withthehighestvalueinLuoyangandthelowestvalueinZhengzhou.Thesoilcarbonstorageindifferentsoillayersexhibitedadecreasingtrendwithdepth,withthemoststoredinthetop0-20cmlayer. Theanalysisofinfluencingfactorsshowedthatlandusetype,irrigationfrequency,fertilizerapplication,andsoiltexturesignificantlyaffectedsoilcarbonstorage.Thesoilcarbonstorageinfarmlandwassignificantlyhigherthanthatinwoodlandandgrasslandduetohigherorganicmatterinput.High-frequencyirrigationandregularapplicationoforganicfertilizercanincreasesoilcarbonstorage,whiletheapplicationofchemicalfertilizerhaslittleeffect.Soilswithhighclaycontenthadhighcarbonstoragecapacity,whilesandysoilshadlowcarbonstoragecapacity. Ingeneral,ourstudyindicatesthatthesoilcarbonstorageinthedownstreamirrigationareaoftheYellowRiveriscloselyrelatedtonaturalandanthropogenicfactors.Tomaintainandenhancesoilcarbonstorage,itisnecessarytooptimiselandusetypeandirrigationpracticesandpromotethesustainableuseoforganicfertilizer. Introduction Soilcarbonisanimportantcomponentoftheglobalcarboncycleandplaysanimportantroleinregulatingglobalclimatechange.Thecarboncycleisanaturalprocessinwhichcarbonismovedbetweentheatmosphere,oceans,vegetationandsoilsthroughphotosynthesis,respiration,anddecomposition.Soilsstoreasignificantamountofcarbon,withtheglobalsoilcarbonpoolestimatedat1500-2300PgC(Lal,2004).Thesoilcarbonpoolisalsohighlydynamicandsusceptibletochangesinlanduse,climate,andmanagementpractices(Fangetal.,2019). TheYellowRiverisoneofthelargestriversinChinaandhasalonghistoryofhumansettlementandagriculturaldevelopment.ThedownstreamirrigationareaoftheYellowRiverisoneofthemostimportantagriculturalregionsinChina.However,thein