农业技术效率对农业碳排放的影响基于空间溢出效应与门槛效应分析

农业技术效率对农业碳排放的影响基于空间溢出效应与门槛效应分析一、本文概述Overviewofthisarticle本文旨在探讨农业技术效率对农业碳排放的影响，并基于空间溢出效应与门槛效应进行深入分析。农业作为全球经济的重要组成部分，其可持续发展对全球环境和社会经济稳定具有重大意义。随着农业技术的不断进步，农业碳排放问题逐渐凸显，成为影响农业可持续发展的重要因素。因此，研究农业技术效率与农业碳排放之间的关系，对于制定有效的农业政策、促进农业绿色发展和减少碳排放具有重要的理论和实践意义。Thisarticleaimstoexploretheimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissions,andconductin-depthanalysisbasedonspatialspillovereffectsandthresholdeffects.Asanimportantcomponentoftheglobaleconomy,agriculture'ssustainabledevelopmentisofgreatsignificancetotheglobalenvironmentandsocio-economicstability.Withthecontinuousprogressofagriculturaltechnology,theissueofagriculturalcarbonemissionshasgraduallybecomeprominent,becominganimportantfactoraffectingthesustainabledevelopmentofagriculture.Therefore,studyingtherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissionshasimportanttheoreticalandpracticalsignificanceforformulatingeffectiveagriculturalpolicies,promotinggreenagriculturaldevelopment,andreducingcarbonemissions.本文首先回顾了国内外关于农业技术效率与农业碳排放的研究现状，发现已有研究主要集中在农业碳排放的测算、影响因素分析以及农业技术效率的评估等方面，但对于两者之间的内在联系和空间溢出效应的研究相对较少。基于此，本文尝试从空间溢出效应和门槛效应的角度出发，构建理论模型，探讨农业技术效率对农业碳排放的影响机制。Thisarticlefirstreviewsthecurrentresearchstatusofagriculturaltechnologyefficiencyandagriculturalcarbonemissionsbothdomesticallyandinternationally.Itisfoundthatexistingresearchmainlyfocusesonthecalculationofagriculturalcarbonemissions,analysisofinfluencingfactors,andevaluationofagriculturaltechnologyefficiency.However,thereisrelativelylittleresearchontheintrinsicrelationshipandspatialspillovereffectsbetweenthetwo.Basedonthis,thisarticleattemptstoconstructatheoreticalmodelfromtheperspectivesofspatialspillovereffectsandthresholdeffects,andexploretheimpactmechanismofagriculturaltechnologyefficiencyonagriculturalcarbonemissions.在空间溢出效应方面，本文认为农业技术效率的提升不仅直接影响本地区的农业碳排放，还可能通过空间溢出效应对周边地区的农业碳排放产生影响。这种溢出效应可能表现为技术传播、示范效应和竞争效应等多种形式，从而对区域农业碳排放产生重要影响。Intermsofspatialspillovereffects,thisarticlebelievesthattheimprovementofagriculturaltechnologyefficiencynotonlydirectlyaffectstheagriculturalcarbonemissionsinthelocalarea,butmayalsohaveanimpactontheagriculturalcarbonemissionsinsurroundingareasthroughspatialspillovereffects.Thisspillovereffectmaymanifestinvariousformssuchastechnologydissemination,demonstrationeffect,andcompetitioneffect,therebyhavingasignificantimpactonregionalagriculturalcarbonemissions.在门槛效应方面，本文认为农业技术效率与农业碳排放之间的关系可能存在一定的门槛值。当农业技术效率达到某一水平时，其对农业碳排放的影响可能会发生变化，表现出非线性特征。因此，本文将进一步分析这种门槛效应的存在性及其对农业碳排放的影响。Intermsofthresholdeffect,thisarticlesuggeststhattheremaybeacertainthresholdvaluefortherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions.Whentheefficiencyofagriculturaltechnologyreachesacertainlevel,itsimpactonagriculturalcarbonemissionsmaychangeandexhibitnon-linearcharacteristics.Therefore,thisarticlewillfurtheranalyzetheexistenceofthisthresholdeffectanditsimpactonagriculturalcarbonemissions.本文将通过理论模型构建、实证分析等方法，深入探讨农业技术效率对农业碳排放的影响机制，以期为农业可持续发展和碳排放减排提供有益的参考和建议。Thisarticlewillexploretheimpactmechanismofagriculturaltechnologyefficiencyonagriculturalcarbonemissionsthroughtheoreticalmodelconstruction,empiricalanalysis,andothermethods,inordertoprovideusefulreferencesandsuggestionsforsustainableagriculturaldevelopmentandcarbonemissionreduction.二、农业技术效率与农业碳排放的理论分析TheoreticalAnalysisofAgriculturalTechnologyEfficiencyandAgriculturalCarbonEmissions农业技术效率与农业碳排放之间存在着紧密的联系，这种联系主要体现在两个方面：空间溢出效应和门槛效应。农业技术效率的提升对于减少农业碳排放具有直接的影响。农业技术的进步，如新型农业机械、智能化农业设备、精准农业技术的应用等，都可以提高农业生产效率，减少农业生产过程中的能源消耗和碳排放。农业技术效率的提升也可以促进农业生态系统的恢复和保护，进一步提高农业生态系统的碳汇能力，从而减少农业碳排放。Thereisacloserelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions,whichismainlyreflectedintwoaspects:spatialspillovereffectsandthresholdeffects.Theimprovementofagriculturaltechnologyefficiencyhasadirectimpactonreducingagriculturalcarbonemissions.Theprogressofagriculturaltechnology,suchastheapplicationofnewagriculturalmachinery,intelligentagriculturalequipment,andprecisionagriculturaltechnology,canimproveagriculturalproductionefficiency,reduceenergyconsumptionandcarbonemissionsintheagriculturalproductionprocess.Theimprovementofagriculturaltechnologyefficiencycanalsopromotetherestorationandprotectionofagriculturalecosystems,furtherenhancethecarbonsequestrationcapacityofagriculturalecosystems,andtherebyreduceagriculturalcarbonemissions.农业技术效率对农业碳排放的影响还具有空间溢出效应。农业生产活动在空间上具有集聚性，一个地区的农业技术效率提升，可能会对其他地区产生溢出效应，推动周边地区的农业技术效率提升，进而减少周边地区的农业碳排放。这种空间溢出效应的存在，使得农业技术效率的提升在减少农业碳排放方面具有更大的潜力。Theimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissionsalsohasspatialspillovereffects.Agriculturalproductionactivitieshaveagglomerationinspace.Theimprovementofagriculturaltechnologyefficiencyinoneregionmayhavespillovereffectsonotherregions,promotingtheimprovementofagriculturaltechnologyefficiencyinsurroundingareasandreducingagriculturalcarbonemissionsintheseareas.Theexistenceofthisspatialspillovereffecthasgreaterpotentialforimprovingagriculturaltechnologyefficiencyinreducingagriculturalcarbonemissions.农业技术效率对农业碳排放的影响还受到门槛效应的影响。农业技术效率的提升需要达到一定的门槛值，才能对农业碳排放产生显著的影响。这个门槛值可能取决于农业技术创新的程度、农业技术应用的广度和深度、农业生产者的接受程度等因素。只有当农业技术效率的提升达到这个门槛值，才能对农业碳排放产生显著的影响。Theimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissionsisalsoinfluencedbythethresholdeffect.Theimprovementofagriculturaltechnologyefficiencyneedstoreachacertainthresholdvalueinordertohaveasignificantimpactonagriculturalcarbonemissions.Thisthresholdvaluemaydependonfactorssuchasthedegreeofagriculturaltechnologyinnovation,thebreadthanddepthofagriculturaltechnologyapplication,andtheacceptanceofagriculturalproducers.Onlywhentheimprovementofagriculturaltechnologyefficiencyreachesthisthresholdcanithaveasignificantimpactonagriculturalcarbonemissions.因此，我们需要深入研究农业技术效率与农业碳排放之间的关系，了解这种关系的内在机制和影响因素，以便更好地制定农业政策，推动农业技术效率的提升，减少农业碳排放，实现农业生产的可持续发展。Therefore,weneedtoconductin-depthresearchontherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions,understandtheunderlyingmechanismsandinfluencingfactorsofthisrelationship,inordertobetterformulateagriculturalpolicies,promotetheimprovementofagriculturaltechnologyefficiency,reduceagriculturalcarbonemissions,andachievesustainabledevelopmentofagriculturalproduction.三、农业技术效率与农业碳排放的空间溢出效应分析Analysisofspatialspillovereffectsofagriculturaltechnologyefficiencyandagriculturalcarbonemissions农业技术效率的提升和农业碳排放的空间分布并非孤立存在，它们之间存在着复杂的空间关联性和溢出效应。为了深入理解这种关系，本研究基于空间计量经济学的理论框架，构建了一个空间杜宾模型（SpatialDurbinModel,SDM）来分析农业技术效率对农业碳排放的空间溢出效应。Theimprovementofagriculturaltechnologyefficiencyandthespatialdistributionofagriculturalcarbonemissionsdonotexistinisolation,andtherearecomplexspatialcorrelationsandspillovereffectsbetweenthem.Inordertogainadeeperunderstandingofthisrelationship,thisstudyconstructedaSpatialDurbinModel(SDM)basedonthetheoreticalframeworkofspatialeconometricstoanalyzethespatialspillovereffectsofagriculturaltechnologyefficiencyonagriculturalcarbonemissions.我们选取了一系列农业技术效率的指标，包括农业机械化水平、农业水资源利用效率、农业化肥使用效率等，以全面反映农业生产的技术效率水平。同时，我们也考虑了农业碳排放的空间分布特征，通过构建空间权重矩阵来捕捉不同地区之间的空间依赖性和异质性。Wehaveselectedaseriesofindicatorsforagriculturaltechnologyefficiency,includingagriculturalmechanizationlevel,agriculturalwaterresourceutilizationefficiency,agriculturalfertilizerutilizationefficiency,etc.,tocomprehensivelyreflectthetechnicalefficiencylevelofagriculturalproduction.Atthesametime,wealsoconsideredthespatialdistributioncharacteristicsofagriculturalcarbonemissionsandcapturedthespatialdependenceandheterogeneitybetweendifferentregionsbyconstructingaspatialweightmatrix.在模型的设定上，我们假设农业技术效率的提升不仅会影响本地区的农业碳排放，还会通过空间溢出效应对邻近地区的农业碳排放产生影响。这种空间溢出效应可能来自于农业技术的推广和应用、农业生产要素的空间流动、以及农业政策的区域协调等方面。Intermsofmodelsetting,weassumethattheimprovementofagriculturaltechnologyefficiencywillnotonlyaffecttheagriculturalcarbonemissionsinthelocalarea,butalsohaveanimpactontheagriculturalcarbonemissionsinneighboringareasthroughspatialspillovereffects.Thisspatialspillovereffectmaycomefromthepromotionandapplicationofagriculturaltechnology,thespatialflowofagriculturalproductionfactors,andregionalcoordinationofagriculturalpolicies.通过模型的估计和检验，我们发现农业技术效率的提升确实对农业碳排放产生了显著的空间溢出效应。具体来说，当本地区的农业技术效率提高时，不仅会减少本地区的农业碳排放，还会通过空间溢出效应带动邻近地区农业碳排放的减少。这种效应在不同地区之间存在差异，但在总体上表现为一种正向的空间关联性和溢出效应。Throughmodelestimationandtesting,wefoundthattheimprovementofagriculturaltechnologyefficiencydoesindeedhaveasignificantspatialspillovereffectonagriculturalcarbonemissions.Specifically,whentheagriculturaltechnologyefficiencyintheregionimproves,itnotonlyreducestheagriculturalcarbonemissionsintheregion,butalsodrivesthereductionofagriculturalcarbonemissionsinneighboringareasthroughspatialspillovereffects.Thiseffectvariesamongdifferentregions,butoverallitmanifestsasapositivespatialcorrelationandspillovereffect.进一步的分析显示，空间溢出效应的大小和方向受到多种因素的影响，包括地区之间的空间距离、农业生产的产业结构、农业生产要素的流动性等。因此，在制定农业减排政策和提高农业技术效率时，需要充分考虑这些因素的空间效应和互动关系，以实现农业碳排放的有效控制和农业生产的可持续发展。Furtheranalysisshowsthatthesizeanddirectionofspatialspillovereffectsareinfluencedbyvariousfactors,includingspatialdistancebetweenregions,industrialstructureofagriculturalproduction,andmobilityofagriculturalproductionfactors.Therefore,whenformulatingagriculturalemissionreductionpoliciesandimprovingagriculturaltechnologicalefficiency,itisnecessarytofullyconsiderthespatialeffectsandinteractiverelationshipsofthesefactors,inordertoachieveeffectivecontrolofagriculturalcarbonemissionsandsustainabledevelopmentofagriculturalproduction.农业技术效率与农业碳排放之间存在着复杂的空间溢出效应。通过深入分析和理解这种效应的作用机制和影响因素，可以为制定更加科学和有效的农业减排政策提供理论支持和实践指导。Thereisacomplexspatialspillovereffectbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions.Throughin-depthanalysisandunderstandingofthemechanismandinfluencingfactorsofthiseffect,theoreticalsupportandpracticalguidancecanbeprovidedfortheformulationofmorescientificandeffectiveagriculturalemissionreductionpolicies.四、农业技术效率与农业碳排放的门槛效应分析Analysisofthethresholdeffectofagriculturaltechnologyefficiencyandagriculturalcarbonemissions在探讨农业技术效率对农业碳排放的影响时，除了考虑空间溢出效应外，还需要深入分析门槛效应的存在。门槛效应，又称为阈值效应，指的是当某一变量达到某个特定水平时，会对其他变量产生显著的非线性影响。在农业技术效率与农业碳排放的关系中，这种效应可能表现为当农业技术效率提高到某个水平后，其对农业碳排放的影响会发生显著变化。Whenexploringtheimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissions,inadditiontoconsideringspatialspillovereffects,itisalsonecessarytodeeplyanalyzetheexistenceofthresholdeffects.Thethresholdeffect,alsoknownasthethresholdeffect,referstothesignificantnonlinearimpactthatavariablewillhaveonothervariableswhenitreachesaspecificlevel.Intherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions,thiseffectmaymanifestasasignificantchangeinitsimpactonagriculturalcarbonemissionswhenagriculturaltechnologyefficiencyreachesacertainlevel.为了更深入地理解这种门槛效应，我们采用了面板门槛回归模型进行实证分析。该模型允许我们根据农业技术效率的不同水平，分段考察其对农业碳排放的影响。通过这种方法，我们可以更准确地揭示农业技术效率与农业碳排放之间的非线性关系。Inordertogainadeeperunderstandingofthisthresholdeffect,weusedapanelthresholdregressionmodelforempiricalanalysis.Thismodelallowsustoexaminetheimpactofdifferentlevelsofagriculturaltechnologyefficiencyonagriculturalcarbonemissionsinsegments.Throughthismethod,wecanmoreaccuratelyrevealthenonlinearrelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions.在模型构建过程中，我们选取了一系列控制变量，包括农业产业结构、农业生产要素投入、农业政策等，以更全面地反映农业技术效率与农业碳排放之间的关系。同时，我们采用了全国各省份的面板数据，确保了数据的广泛性和代表性。Intheprocessofmodelconstruction,weselectedaseriesofcontrolvariables,includingagriculturalindustrystructure,agriculturalproductionfactorinput,agriculturalpolicies,etc.,tomorecomprehensivelyreflecttherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions.Atthesametime,weusedpaneldatafromvariousprovincesacrossthecountrytoensurethebreadthandrepresentativenessofthedata.通过实证分析，我们发现农业技术效率对农业碳排放的影响确实存在门槛效应。具体来说，在农业技术效率较低的阶段，其对农业碳排放的抑制作用较弱；而随着农业技术效率的提高，其对农业碳排放的抑制作用逐渐增强。这一结果为我们制定更加精准的农业减排政策提供了重要参考。Throughempiricalanalysis,wefoundthatthereisindeedathresholdeffectontheimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissions.Specifically,inthestagewhereagriculturaltechnologyefficiencyislow,itsinhibitoryeffectonagriculturalcarbonemissionsisrelativelyweak;Withtheimprovementofagriculturaltechnologyefficiency,itsinhibitoryeffectonagriculturalcarbonemissionsgraduallystrengthens.Thisresultprovidesimportantreferenceforustoformulatemorepreciseagriculturalemissionreductionpolicies.我们还发现不同地区的农业技术效率与农业碳排放之间的关系存在差异。这可能是由于不同地区的农业生产条件、资源禀赋、政策环境等因素的差异所导致的。因此，在制定农业减排政策时，需要充分考虑地区的差异性，确保政策的针对性和有效性。Wealsofoundthattherearedifferencesintherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissionsindifferentregions.Thismaybeduetodifferencesinagriculturalproductionconditions,resourceendowments,policyenvironments,andotherfactorsindifferentregions.Therefore,whenformulatingagriculturalemissionreductionpolicies,itisnecessarytofullyconsiderregionaldifferencesandensurethetargetedandeffectivenatureofthepolicies.农业技术效率对农业碳排放的影响存在门槛效应。为了更有效地减少农业碳排放，我们需要继续提高农业技术效率，特别是在技术效率较低的地区。政策制定者还需要充分考虑地区的差异性，制定更加精准的农业减排政策。未来的研究可以进一步探讨如何结合空间溢出效应和门槛效应，为农业减排提供更加全面和有效的策略建议。Theimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissionshasathresholdeffect.Inordertoeffectivelyreduceagriculturalcarbonemissions,weneedtocontinuetoimproveagriculturaltechnologicalefficiency,especiallyinareaswithlowertechnologicalefficiency.Policymakersalsoneedtofullyconsiderregionaldifferencesanddevelopmorepreciseagriculturalemissionreductionpolicies.Futureresearchcanfurtherexplorehowtocombinespatialspillovereffectsandthresholdeffectstoprovidemorecomprehensiveandeffectivestrategicrecommendationsforagriculturalemissionreduction.五、农业技术效率对农业碳排放影响的实证分析Empiricalanalysisoftheimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissions在深入探讨农业技术效率对农业碳排放的影响时，我们需要考虑两个核心效应：空间溢出效应和门槛效应。这两种效应在农业技术效率与农业碳排放的关系中起着至关重要的作用。Whendelvingintotheimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissions,weneedtoconsidertwocoreeffects:spatialspillovereffectsandthresholdeffects.Thesetwoeffectsplayacrucialroleintherelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions.空间溢出效应分析揭示了农业技术效率的提升不仅直接减少了本地的农业碳排放，还会对周边地区的碳排放产生积极的影响。这种效应的存在是因为农业技术的推广和应用具有空间传播性，一个地区的农业技术进步会激发相邻地区的技术创新，进而促进整个区域的农业碳排放减少。通过构建空间计量模型，我们发现农业技术效率的空间溢出效应显著存在，为政策制定者提供了在区域协同减排方面的新思路。Theanalysisofspatialspillovereffectsrevealsthattheimprovementofagriculturaltechnologyefficiencynotonlydirectlyreduceslocalagriculturalcarbonemissions,butalsohasapositiveimpactoncarbonemissionsinsurroundingareas.Theexistenceofthiseffectisduetothespatialdisseminationofagriculturaltechnologypromotionandapplication.Theprogressofagriculturaltechnologyinaregionwillstimulatetechnologicalinnovationinadjacentareas,therebypromotingthereductionofagriculturalcarbonemissionsintheentireregion.Byconstructingaspatialeconometricmodel,wefoundthatthereisasignificantspatialspillovereffectonagriculturaltechnologyefficiency,providingpolicymakerswithnewideasforregionalcollaborativeemissionreduction.门槛效应分析则表明农业技术效率对农业碳排放的影响存在非线性关系。当农业技术效率达到一定的阈值时，其对碳排放的减少作用会变得更加明显。这意味着在农业技术发展的初期阶段，其对碳排放的影响可能并不显著，但随着技术效率的不断提升，其减排效果会逐渐显现并加速。这一发现为政策制定者提供了关于农业技术发展的优先方向和重点领域的指导。Thethresholdeffectanalysisindicatesthatthereisanon-linearrelationshipbetweenagriculturaltechnologyefficiencyandagriculturalcarbonemissions.Whentheefficiencyofagriculturaltechnologyreachesacertainthreshold,itseffectonreducingcarbonemissionsbecomesmorepronounced.Thismeansthatintheearlystagesofagriculturaltechnologydevelopment,itsimpactoncarbonemissionsmaynotbesignificant,butwiththecontinuousimprovementoftechnologicalefficiency,itsemissionreductioneffectwillgraduallybecomeapparentandaccelerate.Thisdiscoveryprovidesguidanceforpolicymakersontheprioritydirectionsandkeyareasofagriculturaltechnologydevelopment.在实证分析中，我们采用了多种计量经济学方法和模型，包括空间自相关分析、空间面板数据模型、门槛回归模型等，以全面揭示农业技术效率对农业碳排放的影响机制。这些模型的应用不仅增强了我们的分析结果的稳健性和可靠性，还为未来的研究提供了有益的参考。Inempiricalanalysis,weadoptedvariouseconometricmethodsandmodels,includingspatialautocorrelationanalysis,spatialpaneldatamodel,thresholdregressionmodel,etc.,tocomprehensivelyrevealtheimpactmechanismofagriculturaltechnologyefficiencyonagriculturalcarbonemissions.Theapplicationofthesemodelsnotonlyenhancestherobustnessandreliabilityofouranalysisresults,butalsoprovidesusefulreferencesforfutureresearch.通过实证分析我们发现农业技术效率对农业碳排放具有显著的影响，且这种影响在空间溢出效应和门槛效应的共同作用下表现出复杂性和多样性。这些发现为政策制定者提供了在制定农业减排政策时需要考虑的重要因素和依据。Throughempiricalanalysis,wefoundthatagriculturaltechnologyefficiencyhasasignificantimpactonagriculturalcarbonemissions,andthisimpactexhibitscomplexityanddiversityunderthecombinedeffectsofspatialspillovereffectsandthresholdeffects.Thesefindingsprovideimportantfactorsandbasisforpolicymakerstoconsiderwhenformulatingagriculturalemissionreductionpolicies.六、结论与建议Conclusionandrecommendations本研究深入探讨了农业技术效率对农业碳排放的影响，并基于空间溢出效应与门槛效应进行了详细分析。通过综合运用多种计量经济学方法和空间计量模型，本研究得出了一系列有意义的结论。Thisstudydelvesintotheimpactofagriculturaltechnologyefficiencyonagriculturalcarbonemissions,andprovidesadetailedanalysisbasedonspatialspillovereffectsandthresholdeffects.Throughthecomprehensiveapplicationofvariouseconometricmethodsandspatialeconometricmodels,thisstudyhasdrawnaseriesofmeaningfulconclusions.结论方面，研究发现农业技术效率的提升对农业碳排放具有显著的负向影响，表明技术进步在减少农业碳排放方面发挥着关键作用。同时，空间溢出效应分析显示，农业技术效率的提升不仅对本地区的农业碳排放有减少作用，还会对邻近地区产生空间溢出效应，进一步推动整个区域的农业碳排放减少。门槛效应分析揭示了农业技术效率对农业碳排放的影响存在非线性特征，即在达到一定的技术效率门槛后，其对农业碳排放的减少作用会更加明显。Intermsofconclusion,researchhasfoundthattheimprovementofagriculturaltechnologyefficiencyhasasignificantnegativeimpactonagriculturalcarbonemissions,indicatingthattechnologicalprogressplaysakeyroleinreducingagriculturalcarbonemissions.Meanwhile,theanalysisofspatialspillovereffectsshowsthattheimprovementofagriculturaltechnologyefficiencynotonlyreducesagriculturalcarbonemissionsinthe