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1、南方農(nóng)業(yè)學(xué)報(bào)JOURNALOFSOUTHERNAGRICULTUREISSN2095—1191;CODENNNXAABhttp://www.nfnyxb.silDOI:10.39696:issn.2095-1191.2013.11.1851不同施氮量對(duì)稻田氨揮發(fā)損失的影響區(qū)惠平a,周柳強(qiáng)a,黃金生a,曾艷,韋運(yùn)蘭,黃美福,謝如林,劉昔輝,譚宏偉(廣西農(nóng)科院農(nóng)業(yè)資源與環(huán)境研究所;甘蔗研究所,南寧530007)摘要:【目的】研究不同施氮量對(duì)稻田氨揮發(fā)損失的影響,為解決稻田氮素低利用率提供參考依據(jù)?!痉椒ā坷秒p季稻田間試驗(yàn),采用動(dòng)態(tài)室法監(jiān)測(cè)基肥和穗肥施用不同用量氮素后的土壤氨揮發(fā)
2、特征及田面水氮形態(tài)含量特征。【結(jié)果】早稻基肥期土壤氨揮發(fā)損失峰值于施肥后第5d出現(xiàn),第9d接近對(duì)照水平;晚稻同期及穗肥期土壤氨揮發(fā)損失峰值均于施肥后第1d出現(xiàn)。基肥氨揮發(fā)損失量低于穗肥,晚稻高于早稻。早、晚稻平均氨揮發(fā)損失率分別為12.99%和21.79%。施氮提高氨揮發(fā)損失量和累積損失量,且隨施氮量的增加而呈現(xiàn)不同程度地增加。氨揮發(fā)損失率隨施氮量的增加而降低。相關(guān)分析表明,氨揮發(fā)損失量和磷肥施用量均與田面水銨態(tài)氮、硝態(tài)氮和溶解性總氮含量呈顯著或極顯著直線正相關(guān)?!窘Y(jié)論】施氮通過(guò)提高田面水氮含量促進(jìn)稻田氨揮發(fā)損失。通過(guò)合理施肥、改變肥料特性等措施降低施肥后田面水中氮含量降低,
3、從而減少稻田土壤氨揮發(fā)損失。關(guān)鍵詞:水稻田;施氮量;氨揮發(fā);田面水氮含量;降低措施中圖分類號(hào):s511.062文獻(xiàn)標(biāo)志碼:A文章編號(hào):2095—1191(2013)11-1851-05NitrogenapplicationilmpactonammoniavolatilizatioIni‘npaddyfieldouHui-ping,ZHOULiu-qiang,HUANGJin-sheng,ZENGYan,WEIYun-lan,HUANGMei—fu,XIERu—lin,LIUXi—hui,TANHong—wei(AgriculturalResourcesandEnvironme
4、ntalResearchInstitute,GuangxiAcademyofAgriculturalSciences,Nanning530007,China;SugarcaneResearchInstitute,GuangxiAcademyofAgriculturalSciences,Nanning530007,China)Abstract:【Objective】Theeffectsofnitrogenfertilizationrateonammoniavolatilization(AV)inpaddyfieldwerestudiedtoprovidereferencesfo
5、rimprovingnitrogenapplicationrateinpaddyfield.【Method】BothoftheAVandnitrogencontentsinsurfacewaterindouble—ricecroppingpaddyfieldtreatedwithvariousratesofnitrogenfertilizerwereinvesti.gatedusingdynamicchambermethod.【Result】TheAVlossreachedpeakonthefifthdayinearlycroppingriceatbasalfertilize
6、rstage,andreachedtheleve1oftheeontrolontheninthday.AVlOSSpeakvalueoflatecroppingriceandtop—dressingperiodsawitsmaximumonthefirstdayoffertilizing.ThetotalamountofAVlOSSwaslessatbasalfertilizerthanthatatthepanicleinitiationstage,whilewasmoreinlatecroppingricethanthatinearlycroppingrice.During
7、thewholericegrowingseason,AVlossaccountedfor12.99%and21.79%ofappliedNforearlycroppingriceandlatecroppingrice,respectively.Meanwhile,AVlossandaccumulativelossincreasedwiththeincreaseofapplicationrateofnitrogenfertilizerinpaddyfield.However.AVlOSSratereduc