我国东南种植香蕉土壤碳氮循环与输出特征模拟

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1、摘要年平均净矿化量增长量高达95．3kgNhm-2．a-1，增加幅度为40．3％；植物吸收氮量的年平均值增加幅度为6．7％：土壤的反硝化年平均损失量增加幅度为37．7％，其它氮素循环途径相对变化较小，呈小幅度的上升趋势。改变灌溉方式：通过改变灌溉时间的长短来改变灌溉的方式，发现灌溉方式的改进可有效减低种植香蕉土壤氮素的淋溶流失，降低幅度约20％，对土壤氮素的其它循环途径几乎没有影响。(4)在上述工作的基础上，提出了流域农业最佳管理措施和保障政策。管理措施主要包括施肥、灌溉和耕作管理措施。保障政策是主要包括制定限定性农业生产技术标准和完善农业环境管理制度。关键词：NCS

2、WAP模型；土壤碳氮循环；管理措施；情景模拟分析UAbstractSoilC，Ncycleswerethemostbasicecologicalprocessesoftheagroeeosystem，understandingsoilC，NcyclesWasthepremisetostudythesoilC，Ncyclesoftheterrestrialecosystem．AsmallareainWuchuancatchmentofNanjingCountywasselectedasthestudyareainthispaper，andtakingthebananaf

3、ieldswhichacceptedhighfertilizerrateandcoveredalargearea弱anexample，usingmodelsimulationasthemethod，simulatedthesoilC，Ncycleprocessesandoutputcharacteristicsinalongertimescale(1998--2007)withNCSWAPmodel，andalsocarriedoutscenarioanalysesonfactorsofmanagementmeasureswhichwerelikelytoeffect

4、thesoilC，Ncycles．Finally，gavesomeconstructivesuggestionsforagriculturalproductionandmanagement．Researchfindingswereasfollowing：(1)TestingtheseasonalvariationsofsoilN03。-NandSOCcontentatthebananafieldswhichweresimulationbyNCSWAPmodel．TheresultsshowedthatthemeasuredvalueofsoilN03’-NandSOC

5、contentwereagreeablewiththesimulatedvalue．ThesimulationresultsofNCSWAPwerecomparativelyaccurate，SOthatitcouldbeavailabletosimulatesoilC，Ncyclesandconversionprocessinalongertimescale．(2)WesimulatedsoilC，Ncyclesandoutputcharacteristicsatthebananafields．Itturnedoutthatplantuptake，leachinga

6、ndammoniavolatilizationwerethemainreasonofNloss，andtheannualvariationsofplantuptakeandleachingwerelarge．Nlossbydenitrificationandsurfacerainfallrunoffweresecondarily,andtheannualvariationswererelativelysmall．Themoistureconditionwasthemainfactorcausedannualvariations．TheoutputofdistinctN

7、cycleprocessesandnetamountoforganicNmineralizedwerealittlehigher，whichwerecausedbythehighfertilizerrateinthestudyarea．In10yearstimescale，soilTNcontentappearedabitdecreasingtrend，whensoilSOCcontentkeptbalanceasawhole．(3)WeanalyzedtheeffectsondifferenttheC、Ncycleprocessesunderthr