柴汶河硅藻水华氮磷驱动特征、空间分异与分区治理研究

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Abstract：Toservethemajorstrategyofecological protectionintheYellowRiver Basin，andaimingattheaquaticecological risksintributariescausedbyitrogenandphosphoruspolution，thisstudytakestheChaiwenRiver，atypicaltributaryintelower reachesoftheYelowRiver，astheresearchobject.Through monthlymonitoringof7sections inthemainriverchannelfrom2023 to2024，combiedwithphytoplanktoncommunityidentificationandwaterqualityparameteranalysis，itrevealsthattheChaiwen Riverexhibitsa"nitroge-dominatedandphosphorus-limited"nutrientpattem：Algaldensityisweaklycorelatedwithtotal nitrogen （r=0.420 P<0.001 ），and negatively correlated with total phosphorus （r=-0.289） ）.During the dry season，diatom blooms reach a moderate level （peak value of 3.74×107 cells/L， with Cyclotella accounting for 95.13% ）.The spatiotemporal differences in nitrogen and phosphorus nutrients are significant： Total nitrogen （2.7-39.5mg/L） is thehighest in winter and downstream，mainly influenced by sewage discharge and algal metabolism; total phosphorus （0.01-1.3mg/L） isrelatively high in the middle and upper reaches as wellas in spring and summer，mainly due to aquaculture wastewater discharge;ammonia nitrogen （peak value of 3.6mg/L at CW3） and nitrate nitrogen （peak value of 11.57mg/L atCW7） are driven by agricultural and industrial wastewaterdischargeandgroundwaterrecharge，respectively.Basedonthesefindings，a"zoning-grading-coordination" goverance approach isproposed，suppementedbycrossrgionalcological waterreplenishment during thedryseasonThis providesatechnicalparadigmformeetingthebasinassessmenttargetsduringShandongProvince's14thFive-YearPlanperiod and for implementing targeted pollution control in the Yelow River tributaries.

Keywords：Yelow River Basin; ChaiwenRiver;diatomalgal bloom; cyclotella; nitrogenand phosphorus nutrients

在水生生态系统中，硅藻是不可或缺的一部分，对维持水域的生态平衡和水质状况起到了重要的指示作用，在河流和湖泊的水环境监测及生态健康评估至关重要[1-3]。（剩余14494字）