華北平原雨水有機(jī)氮的定量研究.pdf

1、Y938827分類號；密級：飛嚼差≮式等碩士學(xué)位論文單位代碼：10019學(xué)號：S040300華北平原雨水有機(jī)氮的定量研究PreliminaryStudyonOrganicNitrogeninRainwaterinNorthChinaPlain研究生：嫠型霞指導(dǎo)教師：型堂堊熬攮申請學(xué)位門類級別：盛堂硒——專業(yè)名稱：擅揚(yáng)萱差研冤方向：盛業(yè)瓷源蔓噩縫所在學(xué)院：瓷漚當(dāng)玨縫堂瞳二零零六年六月AbstractAtmosphericnitrogen(

2、N)deposition，asimportantpartofglobalbiogeochemicalcycleofN，includesbothwetanddrydepositionForalongtime，mostevaluationsonatmosphericNdepositionhavebeenfocusedexclusivelyonthedepositionofinorganicN(IN)forms0gNHaNandN鷗N)The

3、organicN(ON)deposition，howeverisnotpaidmuchattentionandisoftenconsiderednegligihleduetotherestrictionofmeasurementThusthetotalNON)depositionfluxesareunderestimatedNowadays，attentiontoatmosphericorganicN(oN)depositionisin

4、creasingThisstudyprovidespreliminaryestimatesofONwetfluxesinNoahChinaPlain(NCP)DuringNovember2004toSeptember2005，amonitoringnetworkwassteadilyestablishedateightsitesinNCPincludingChangping，Dongbeiwang(DBW)，CampusExperime

5、ntalFarm(CEF)，ShunyiandBeijingAcademyofAgroForestrySciences(BAAFS)inBeijing；WuqiaoandQuzhouinHebeiprovince；ShouguanginShandongprovince，todeterminethetemporalandspatialvariationofONdepositionRaingaugesandwetonlysamplerswe

6、reinstalledforthecollectionofrainwaterandthefluxesofONweredeterminedthroughthedifferencebetweentotalNON)andINItshowedthattheconcentrationofONinrainwaterrangedmonthlyfrom022mgNL1to323mgNL1withmeanconcentrationof109mgNL1Bu

7、lkdepositionofONvariedgreatlyamongdifferentsites，Duringthemonitoringperiods，thebulkdepositionofONinChangpingwasonly130kgNha1，andthedepositionof928kgNha—inDBWwagthehighestGenerallyfromMay2005toSeptember2005themeanvalueofb

8、ulkdepositionofONinNCPwas408kgNha一，withdepositionfluxof082kgNha“1permonthTheONcomprisesasignificantfractionoftheTNinprecipitationvaryingfrom9％to37％withallaveragevalueof19％FromMaytoSeptember2005，thewetonlydepositionofONin

9、DBWWuqiaoandQuzhou(309kgNha’1)wasonlyaccountedfor57％ofthecorrespondingbulkdeposition(540kgNha“1)TheresultssuggestthatbothwetanddrydepositionofONcouldbeimportantfractionoftotalatmosphericNdepositioninNCPKeywords：atmospher