資源描述:
《稻麥輪作農(nóng)田氮素循環(huán)的DNDC模型分析.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、植物營養(yǎng)與肥料學(xué)報(bào)2012,18(1):77-88PlantNutritionandFertilizerScience稻麥輪作農(nóng)田氮素循環(huán)的DNDC模型分析1,21*11132夏文建,周衛(wèi),梁國慶,王秀斌,孫靜文,李雙來,劉光榮(1中國農(nóng)業(yè)科學(xué)院農(nóng)業(yè)資源與農(nóng)業(yè)區(qū)劃研究所,北京100081;2江西省農(nóng)業(yè)科學(xué)院土壤肥料與資源環(huán)境研究所,南昌330200;3湖北省農(nóng)業(yè)科學(xué)院植保土肥所,武漢430064)摘要:基于長江中下游稻麥輪作體系的氮肥施用田間試驗(yàn),采用Denitrification-Decompositionmodel(DNDC)模型研究了氣候條件、土壤屬性、農(nóng)業(yè)管理等輸入因素的不確定
2、性對子粒產(chǎn)量、作物氮吸收、氨揮發(fā)、N2O排放等預(yù)測結(jié)果的影響。結(jié)果顯示,采用DNDC模型模擬的土壤氨揮發(fā)速率和N2O排放通量與田間實(shí)測結(jié)果較為吻合,氨揮發(fā)通量模擬值與實(shí)測值相關(guān)系數(shù)為0.688,N2O排放通量模擬值與實(shí)測值相關(guān)系數(shù)為0.528,均達(dá)極顯著水平,表明DNDC模型預(yù)測農(nóng)田土壤氮素具有較高可信度。模擬結(jié)果顯示,氣溫和氮肥用量是影響作物產(chǎn)量和吸氮量的關(guān)鍵因素;土壤氨揮發(fā)主要受氮肥品種影響,并隨氮肥用量增加而增加;土壤N2O排放主要受溫度、土壤pH值、土壤有機(jī)碳含量的影響。為使DNDC能更有效地估算氨揮發(fā)和N2O排放,有必要獲取更翔實(shí)的資料以減少輸入數(shù)據(jù)的不確定性。關(guān)鍵詞:稻麥輪
3、作;氮循環(huán);DNDC模型;敏感性分析+中圖分類號:S153.61;O242.1文獻(xiàn)標(biāo)識(shí)碼:A文章編號: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