欢迎来到天天文库
浏览记录
ID:51462334
大小:717.29 KB
页数:7页
时间:2020-03-25
《施氮量对太湖地区设施菜地年氮素淋失的影响.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、农业环境科学学报2012,31(4):706—712JournalofAgro—EnvironmentScience施氮量对太湖地区设施菜地年氮素淋失的影响陆扣萍1,2,3闵炬3,李蒙4,施卫明3谢寅峰4(1.浙江农林大学环境与资源学院,浙江临安311300;2.浙江省森林生态系统碳循环与固碳减排重点实验室,浙江临安311300;3.中国科学院南京土壤研究所面源污染治理技术研发中心,南京210008;4.南京林业大学森林资源与环境学院,南京210037)摘要:采用田间小区试验,研究了太湖地区设施菜地一年三季作物(番茄一莴苣一芹菜)氮素淋失
2、特征。结果表明:太湖地区设施菜地氮淋失以NO;一N为主,氮素淋洗量受施氮量的直接影响,以农民习惯施氮量(N5)处理下的淋洗总量最高,全年TN淋失总量高达193.6kg·hm。。在N5基础上减施N40%(N3)可分别减少番茄、莴苣和芹菜季TN淋洗损失40.4%、49.2%和57.5%,同时可分别增产15.1%、39.0%和27.8%。设施菜地氮素淋洗高峰发生在揭棚期(7一11月),其中包括揭棚休闲期和莴苣生长前期。揭棚期淋洗液TN平均浓度为51.1mg·L-1,是盖棚期TN浓度的1.7倍;TN淋洗量为129.2kg·hm-2,约占全年总氮淋
3、洗量的66.7%。关键词:太湖地区;设施菜地;氮;淋失中图分类号:X522文献标志码:A文章编号:1672—2043(2012)04—0706—07EffectofNitrogenFertilizerApplicationRatesonAnnualNitrogenLeachingLossfromProtectedVegetableProductionSysteminTaiLakeRegion.ChinaLUKou-ping”,MINJu3,LIMen94,SHIWei—ming’,XIEYin-fen94(1.CollegeofEnvir
4、onmentandResources,ZhejiangAgricultural&ForestryUniversity,Lin’anZhejiang311300,China;2.ZhejiangProvin-cialKeyLaboratoryofCarbonCyclinginForestEcosystemsandCarbonSequestration,ZhejiangA&FUniversityLin’an,Zhejiang311300,China;3.ResearchCenterofNon-pointSourcePollutionContr
5、ol,InstituteofSoilScience,ChineseAcademyofSciences,Nanjing210008,China;4.CoHegeofForestResourcesandEnvironment,NanjingForestryUniversity,Nanjing210037,China)Abstract:Afieldexperimentwasconductedtoevaluatetheeffectofnitrogen(N)fertilizer印plieationratesonNleachinglossfrompr
6、otectedvegetablesoilinTaiLakeregion,China.FiveNtreatments,includingNl(nofertilizer),N5(conventionalNapplicationrateat1560kg·hm‘2·a-I),N2(at40%ofN5theNrate),N3(at60%oftheN5Nrate),andN4(at75%oftheN5Nrate),wereappliedtoatomato,lettuceandeel—cryrotation,atypicalprotectedveget
7、ablecroppingsystemintheregion.ItwasfoundthatthemainformoftheNleachedwasnitrate-N,andtheleachinglossincreasedwiththeNrates.ThehighestannualtotalNleachinglossat193.6kg·hm4ocnrredintheN5treatment.ComparedwiththeN5treatment,theNleachinglossintheN3treatmentreducedby40%,49%and5
8、8%,andyieldincreasedby15%,39%and28%,inthetomato,lettuceandceleryseason,respectively.Theleachingl
此文档下载收益归作者所有