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1、AbioindicatorassessmentframeworkofriverecosystemhealthandthedetectionoffactorsinfluencingthehealthoftheHuaiRiverBasin,ChinaJunXia1,YongyongZhang2,*,ChangsenZhao3,StuartE.Bunn41StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience,WuhanUniversity,Wuhan,430072,China2KeyLaborator
2、yofWaterCycleandRelatedLandSurfaceProcesses,InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences,Beijing,100101,China(Correspondingauthor).E-mail:zhangyy003@gmail.com.3StateKeyLaboratoryofRemoteSensingScience,JointlySponsoredbyBeijingNormalUniversityandtheInst
3、ituteofRemoteSensingApplicationsofChineseAcademyofSciences,Beijing100875,China.SchoolofGeography,BeijingNormalUniversity,Beijing100875,China4AustralianRiversInstitute,GriffithUniversity,Brisbane,Queensland,AustraliaAbstractRiverecosystemhealthassessmentsareahottopicinglobalwaterresourcesm
4、anagement.TheHuaiRiverBasinisarepresentativebasinfacedwithseriousenvironmentalproblemsduetohighwaterpollutionandnumerouswaterprojects.ComprehensiveinvestigationofthefactorsaffectingriverecosystemhealthisanurgentprecursortothesuccessfulmanagementoftheHuaiRiverBasin.Basedonaseriesofaquatice
5、cosystemindicators,monitoringandstandards,suchasphytoplankton,zooplanktonandbenthicmacroinvertebratedata,anassessmentframeworkofriverecosystemhealthisproposedusingamulti-stepgraycorrelationevaluationmethod.Environmentalimpactfactorsincludingclimate,landcover,edaphicfactors,hydrology,water
6、projectsandwaterqualitywereidentifiedusingtheKruskal-Wallistestanddistance-basedredundancyanalysismethod.Theecosystemwasfoundtobesub-healthywith44%(31/71)ofsitesinahealthycondition,51%(36/71)sub-healthyand5%(4/71)unhealthy.Climateandhydrologywerethedominantfactorsthattogethercontributed37
7、.5%,24.1%and6.9%ofthevariationinphytoplankton,zooplanktonandbenthicmacroinvertebrates,respectively.Themainvariablesaffectingvariationwereminimumtemperature,relativehumidity,solarradiation,andthemagnitude,frequency,durationandtimingofmonthlyrunoff.Together,thesevaria
