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《稻麦轮作农田氮素循环的DNDC模型分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、植物营养与肥料学报2012,18(1):77-88PlantNutritionandFertilizerScience稻麦轮作农田氮素循环的DNDC模型分析1,21*11132夏文建,周卫,梁国庆,王秀斌,孙静文,李双来,刘光荣(1中国农业科学院农业资源与农业区划研究所,北京100081;2江西省农业科学院土壤肥料与资源环境研究所,南昌330200;3湖北省农业科学院植保土肥所,武汉430064)摘要:基于长江中下游稻麦轮作体系的氮肥施用田间试验,采用Denitrification-Decompositionmodel(DNDC)模型研究了气候条件、土壤属性、农业管理等输入因素的不确定
2、性对子粒产量、作物氮吸收、氨挥发、N2O排放等预测结果的影响。结果显示,采用DNDC模型模拟的土壤氨挥发速率和N2O排放通量与田间实测结果较为吻合,氨挥发通量模拟值与实测值相关系数为0.688,N2O排放通量模拟值与实测值相关系数为0.528,均达极显著水平,表明DNDC模型预测农田土壤氮素具有较高可信度。模拟结果显示,气温和氮肥用量是影响作物产量和吸氮量的关键因素;土壤氨挥发主要受氮肥品种影响,并随氮肥用量增加而增加;土壤N2O排放主要受温度、土壤pH值、土壤有机碳含量的影响。为使DNDC能更有效地估算氨挥发和N2O排放,有必要获取更翔实的资料以减少输入数据的不确定性。关键词:稻麦轮
3、作;氮循环;DNDC模型;敏感性分析+中图分类号:S153.61;O242.1文献标识码:A文章编号:1008-505X(2012)01-0077-12EvaluatingthevalidityandsensitivityoftheDNDCmodeltoestimatenitrogencyclinginrice-wheatrotationsystem1,21*11132XIAWen-jian,ZHOUWei,LIANGGuo-qing,WANGXiu-bin,SUNJing-wen,LIShuang-lai,LIUGuang-rong(1AgriculturalResourcesand
4、RegionalPlanningInstitute,ChineseAcademyofAgriculturalSciences,Beijing100081,China;2InstituteofSoilandFertilizer&ResourceandEnvironment,JiangxiAcademyofAgriculturalSciences,Nanchang330200,China;3InstituteofPlantProtection,SoilandFertilizer,HubeiAcademyofAgriculturalSciences,Wuhan430064,China)Abs
5、tract:Basedoninsitumeasurementsofammoniavolatilizationandnitrousoxide(N2O)emissionfromawheat-ricerotationfield,asarepresentativeofcroppingsysteminYangtzePlain,thereliabilityandsensitivityofDenitrification-Decompositionmodel(DNDC)forforecastingnitrogencyclingandbalanceweretestedinfieldscale,andin
6、fluencingfactorsofvariousNcyclingpathwayswereidentified.AhigherreliabilitywasfoundbetweensoilammoniavolatilizationandN2OemissionsimulatedbyDNDCmodelandfieldresults,suggestingthattheDNDCmodelcouldbeusedfordescribingnitrogenlossunderdifferentnitrogenfertilizermanagements.Accordingtosensitivitytest
7、ontheDNDCmodel,bothgrainyieldandcropNuptakeweresignificantlyaffectedbytemperatureandnitrogenapplicationrate,ammoniavolatilizationwassignificantlyinfluencedbyfertilizerNtypeandnitrogenapplicationrate,N2Oemissionsignificantlya
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