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川南毛竹林土壤呼吸对林内穿透雨减少和氮素添加的响应.docx

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川南毛竹林土壤呼吸对林内穿透雨减少和氮素添加的响应 标题：川南毛竹林土壤呼吸对林内穿透雨减少和氮素添加的响应 (Title:ResponseofSoilRespirationinJiananMosoBambooForesttoReducedThroughfallandNitrogenAddition) Abstract: Soilrespirationisacrucialprocessinterrestrialecosystems,asitrepresentsoneofthelargestcarbonfluxesbetweenthebiosphereandatmosphere.Understandingtheresponseofsoilrespirationtochangesinenvironmentalfactors,suchasreducedthroughfallandnitrogenaddition,isessentialforpredictingthecarbonbalanceandfunctioningofforestecosystems.ThisstudyaimedtoinvestigatetheeffectsofreducedthroughfallandnitrogenadditiononsoilrespirationinJiananMosoBambooForestinsouthernSichuan. Introduction: Mosobamboo(Phyllostachysedulis)isafast-growingandeconomicallyimportantspeciesinChina.JiananMosoBambooForestisoneofthelargestandoldestbambooforestsinsouthernSichuan.Soilrespiration,thecombinedeffluxofcarbondioxideproducedbybothplantrootsandsoilmicroorganisms,playsasignificantroleinthecarboncyclingofforestecosystems.Changesinthroughfallandnitrogenavailabilitycanaltersoilrespirationrates,affectingthecarbonbalanceandecosystemfunctioning. Methods: ThestudywasconductedinJiananMosoBambooForest,wherethreeexperimentalplotswereestablished:controlplot,reducedthroughfallplot,andnitrogenadditionplot.Soilrespirationwasmeasuredusingtheclosedchambermethod,andsoilsampleswerecollectedforanalysisofcarbonandnitrogencontent.Statisticalanalyses,includinganalysisofvariance(ANOVA)andcorrelationanalysis,wereperformedtoevaluatetheeffectsofreducedthroughfallandnitrogenadditiononsoilrespiration. Results: OurresultsshowedthatreducedthroughfallsignificantlydecreasedsoilrespirationratesintheMosobambooforest.Thereductioninthroughfallledtoadecreaseinmoistureavailability,limitingsoilmicrobialactivityandsubsequentlyreducingsoilrespiration.Nitrogenaddition,ontheotherhand,hadapositiveeffectonsoilrespiration.Theadditionofnitrogenprovidedanadditionalnutrientsourceforthemicrobialcommunity,stimulatingmicrobialactivityandenhancingsoilrespirationrates.Additionally,wefoundapositivecorrelat