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1、AdvancesinMarineSciences海洋科学前沿,2017,4(1),7-16PublishedOnlineMarch2017inHans.http://www.hanspub.org/journal/amshttps://doi.org/10.12677/ams.2017.41002WaterQualityAnalysisandEvaluationinMaolingjiangRiverInletZhenjunKang1,2,3,WeiGuo3,JieLi3,BingweiZhou3,Qiu
2、Wei3,MingliangNong31GuangxiKeyLaboratoryofBeibuGulfMarineBiodiversityConservation,QinzhouGuangxi2TheKeyLaboratoryofCoastalScienceandEngineering,BeibuGulf,QinzhouGuangxi3QinzhouUniversity,QinzhouGuangxistthndReceived:Mar.1,2017;accepted:Mar.19,2017;publis
3、hed:Mar.22,2017AbstractInMay,AugustandOctoberfrom2012to2013,thewaterqualityoftheMaolingjiangRiverinletwasmonitored.Thetotalnitrogen,totalphosphorus,inorganicnitrogen,inorganicphosphorus,chemicaloxygendemand(COD)andpetroleumdatawereanalyzedinordertoresear
4、chthedy-namicchangesandtrendsofthewaterqualityindicators.Meanwhile,thesingle-factorevaluation,nitrogenandphosphorusratio,eutrophicationindexmethodswereusedtoanalyzeandevaluatethewaterquality.TheresultsshowedthatthewaterqualityoftheMaolingjiangRiverinlete
5、x-ceededthestandardthroughouttheyearfrom2012to2013,andthetotalnitrogen,totalphos-phorusandpetroleumexcessivesituationswerenotserious,buttheinorganicnitrogenandinor-ganicphosphorusinAugustandOctoberof2012exceededmorethanthenationalstandardandreachedinthef
6、ourlevelwaterqualitystandards.ThenitrogenandphosphorusratiosintheMao-lingjiangRiverinletfrom2012to2013wereallindifferentdegreeofimbalance.Amongthem,phosphoruswasthemainlimitingfactorofphytoplanktongrowthinMayin2012,butthenitrogenhadbecomethelimitingfacto
7、rofphytoplanktongrowthin2013.ThereweredifferentdegreesofeutrophicationphenomenaintheMaolingjiangRiverinletfrom2012to2013.Amongthem,theeutrophicationphenomenonwasthemostseriousinOctoberin2012and2013.ThemainreasonisthattheCODcontentinwaterisseriouslyexceed
8、ingthestandard,whichindicatesthatthewa-terbodyisaffectedbyurbansewageandthelivestockandpoultrybreedingindustrysourcesoforganicpollutionhavebeenveryserious.Relevantdepartmentsshouldformulateapracticalpro-gramforthestrictcon
