河岸带土壤溶解有机质垂直分布及其影响因素研究崔恒钊

38soilorganicmatterSOM、[1]。《》[e-mail]*[e-mail]。EnvironmentalScience&Technology38620156Vol.38No.6Jun.201511231*1.2000922.2430023.201700dissolvedorganiccarbonDOCdissolvedorganicmatterDOMpH。DOCDOC。DOMDOC90%10%0~30cm40~60cmP0.01。DOMpH。X171.5Adoi10.3969/j.issn.1003-6504.2015.06.0021003-6504(2015)06-0008-06VerticalDistributionandImpactFactorsofSoilDissolvedOrganicMatterinRiparianZonesCUIHengzhao1WANGYulai12ZOULimin3LIJianhua1*1.KeyLaboratoryofYangtzeRiverWaterEnvironmentofMinistryofEducationCollegeofEnvironmentalScienceandEngineeringTongjiUniversityShanghai200092China2.SchoolofEnergyandEnvironmentAnhuiUniversityofTechnologyMaanshan243032China3.QingpuDistrictWaterSupplyManagementStationofShanghaiShanghai201700ChinaAbstractSoilsampleswerecollectedfromthetypicalriparianzoneinChongmingIslandChina.DissolvedorganiccarbonDOCcontentandexcitation-emissionmatrixEEMfluorescencespectrumofsoildissolvedorganicmatterDOMweremeasuredusingparallelfactoranalysisPARAFACandtheeffectofthesoilphysicalandchemicalpropertiesonthedistributionofsoilDOMwasdiscussed.ResultsindicatedthatsoilDOCcontentdecreasedfromthesurfacetosubsurfaceandincreasedfromtheuplandtothebufferzoneinthesurfacelayer.90%ofsoilDOMwashumic-likesubstanceand10%wasprotein-likesubstance.Humic-likesubstance0~30cminsurfacewasmuchmorethanthatinsubsurfaceandprotein-likesubstancedidn’tchangebydepth.SoilDOMdecreasedwiththeincreasingpHinalowersalinitysoilDOMandprotein-likesubstanceincreasedwiththeincreasingsalinitywhilehumic-likesubstancedidn’tchange.KeywordsChongmingIslandriparianzonedissolvedorganicmatterDOMexcitation-emissionmatrixEEMparallelfactoranalysis6dissolvedorganicmatterDOM、、、、、、[2]。DOMDOM1000d[3-4]。SOMDOMDOM、、[5-8]。dissolvedorganiccarbonDOCdissolvedorganicnitrogenDONDOM。[9]。、[10-11]DOMDOM。DOMPARAFACDOMpH、DOM。DOM。11.1BY131°32′N121°45′EBY231°34′N121°49′EZoneA、ZoneBZoneC1。20118A、BC。BY1Phragmitesaustralis。BY2Cinnamomumcamphora。3cm04.02.SCA、BC3m×3m。3。A、BC10cm2mm4℃。1.2DOMOhno[12-13]。0.107mm。1∶10g∶mL20℃150r/min24h4℃8000r/min20min0.45μmGF/FWhatman450℃5hDOM。DOMDOCDOM。DOCTOC-VCPH。3~52%。WET-2pHHQ40105℃。-pH7.26~8.211∶5w/w/46.02%~52.78%1.38~1.61g/cm3。pH1。BY1pH1pHTable1VerticaldistributionsofpHandsalinityacrossdifferentriparianzones/cm(A)(B)(C)BY1BY2BY1BY2BY1BY2pH0~108.217.687.837.777.267.7010~208.127.767.967.917.477.7820~308.107.778.108.047.507.8330~408.157.898.057.887.847.7940~508.117.748.117.877.847.8750~607.967.868.167.937.828.01/‰0~100.640.360.300.241.271.4910~200.580.320.310.271.331.3420~300.540.380.340.221.431.4730~400.500.340.330.210.821.3640~500.460.380.300.290.631.6450~600.430.380.250.620.641.6538pHP0.001BY2pHpHP0.05pH。0.21‰~1.49‰。P0.001。1.3F-4500DOMEx=220~400nm3nmEm=200~500nm2nm。Milli-QR.U.nm-1[14-16]。“N-way”Matlab8.0MathworksPARAFAC[16]。PARAFACDOM[16]。22.1DOCDOC36.10mg/kg116.70mg/kg2。DOCBY1BY2。BY1BY20~20cmDOC。BY1DOCBY2DOC。BY2BY1BY2DOC。2.2DOMPARAFAC36DOM4CDOMC1Ex/Em=283364nm/454nm、C2Ex/Em=337nm/410nm、C3Ex/Em=241nm/426nmC4Ex/Em=295nm/382nm2。PARAFACDOM4C1C2C3C43。DOM0.19~1.50R.U.。BY1DOMP0.05BY1DOM。BY2DOMDOMDOM。DOMDOC6BY1BY20~20cmDOM40~60cmP0.01。DOM-DOM。BY1DOMC1、C2、C3C44DOM23±3%、24±2%、39±2%15±5%BY2DOMC1、C2、C3C44DOM27±7%、25±7%、38±3%9±6%。DOMDOM90%10%。2PARAFACDOMTable2PropertiesoffourPARAFACderivedDOMcomponentsandcomparisonswithliteraturesEx/nmEm/nmEx/Em/nmC1283,364454C2:250(385)/504[17]C1:265(376)/478[18]C2337410C3:250(305)/412[17]C2:244(316)/426[18]C3241426C4:250(360)/440[17]C1:255(350)/471[19]C4295382C7:280/344[17]C3:220(277)/298,338[18]C4:225(275)/322[19]、DOM。BY1C1、C2C3P0.05BY2。C4P0.05。C1、C2C3。BY1BY20~30cm40~60cmP0.01。2C4。2.3DOMBY1BY2DOC、DOMC1、C3C4pHP0.05P0.0014。7pH8.4DOCDOMpH。[20-22]。DOC-pHDOM-pHpHDOMDOC。DOMpHC1C3C4DOMpHpH。C138C3C4C1C3pHC4。pHC2。DOM。DOMDOM-。pHDOMDOM、pHDOMDOM[23]DOMpHDOC[24]pHpH[25]DOMpHDOM。2‰DOMDOC。、[26]DOMC4pHpHDOM。DOC、。31DOMDOMDOC、DOM。2DOMpH。DOMpH2‰DOMDOC。[][1]vonLützowMKo咬gelKnabnerI.Temperaturesensitivityofsoilorganicmatterdecomposition:whatdoweknow[J].Bi－ologyandFertilityofSoils20094611-15.[2].[J].199918332-38.ShenHongCaoZhihongHuZhengyi.Characteristicsandecologicaleffectsoftheactiveorganiccarboninsoil[J].JournalofEcology199918332-38.inChinese[3]JiaoNHerndlGJHansellDAetal.Microbialproductionofrecalcitrantdissolvedorganicmatterlong-termcarbonstorageintheglobalocean[J].NatureReviewsMicrobiol－ogy201088593-599.[4]BolRPoirierNBalesdentJetal.Molecularturnovertimeofsoilorganicmatterinparticle-sizefractionsofanarablesoil[J].RapidCommunicationsinMassSpectrometry2009623162551-2558.[5]FlessaHLudwigBHeilBetal.TheOriginofsoilorgan－icCdissolvedorganicCandrespirationinalong-termmaizeexperimentinHalleGermanydeterminedby13Cnaturalabundance[J].JournalofPlantNutritionandSoilSci－ence20001632157-163.[6].[J].2011204652-658.GaoTaizhongZhangHaoZhouJianwei.Effectofdis－solvedorganicmatterontheenvironmentalbehaviorsofheavymetalsinsoils[J].EcologyandEnvironmentalSci－ence2011204652-658.inChinese[7]Ro咬mkensPFAMDolfingJ.EffectofCaonthesolubilityandmolecularsizedistributionofDOCandCubindinginsoilsol