洪泽湖叶绿素a浓度的时空变化特征
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2020-03-17 10:35:22
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LakeSci.(湖泊科学),2016,28(3):583—591D0I10.18307/2016.O314⑥2016byJournalofLakeSciences洪泽湖叶绿素a浓度的时空变化特征齐凌艳,黄佳聪,高俊峰,黄琪,周毅,田威(1:中国科学院南京地理与湖泊研究所,南京210008)(2:中国科学院大学,北京100049)(3:江苏省水文水资源勘测局,南京210029)摘要:叶绿素a浓度是衡量藻类生物量及评价水体营养状态的重要指标.基于洪泽湖2012年12月至2013年11月的水质监测数据,利用统计手段分析湖区叶绿素a浓度的时空变化规律,并进一步探究叶绿素a浓度与各项水质理化因子的响应关系.从时间维度上看,洪泽湖叶绿素a浓度季节变化规律在不同湖区有所差异,东部湖区叶绿素a浓度随季节变化曲线呈“双峰型”,分别在3月和8月达到峰值.北、西部湖区叶绿素a浓度在春季变化平缓,并在秋季达到峰值.从空间维度上看,3个湖区之间叶绿素a浓度在春、冬两季存在显著差异,其余季节差异不显著.典范对应分析表明洪泽湖不同月份、不同湖区叶绿素a浓度与水质理化因子之间存在不同的响应关系.本研究为探究洪泽湖藻类时空异质性原因、宏观掌控其营养状态以及制定相应水质改善措施提供参考依据.关键词:叶绿素a;洪泽湖;时空变化;典范对应分析Spatial—temporalvariationcharacteristicsofchlorophyll-aconcentrationinLakeHongzeQILingyan,HUANGJiacong,GAOJunfeng”,HUANGQi,ZHOUYi&TIANWei(1:NanjingInstituteofGeograpandLimnology,ChineseAcademyofSciences,Nanjing210008,PR.China)(2:UniversityofChineseAcademyofSciences,Beijing100049,P.R.China)(3:JiangsuProvinceHydrologyandWaterResourceslnvestigationBureau,Nanjing210029,P.R.China)Abstract:Chlorophyll—aconcentrationisusuallymeasuredtoindicatealgaebiomassandtoevaluateeutrophicationleveloffreshwa—terlakes.BasedonthewaterqualitymonitoringdatafromDecember2012toNovember2013,thispaperisaimedtoanalyzethespatial·-temporalvariationcharacteristicofchlorophyll·-aconcentrationinLakeHongzeandfurthertoexploretherelationshipofchlorophyll-aconcentrationandotherwaterqualityfactors.Firstly,fromthestatisticalcha~sofserieschlorophyll—aconcentrationfromeightwatersamplingsites,theseasonalvariationCHIVeofeasternzoneshowedabimodalinaboutMarchandAugust.Howev-er,theseasonalvariationcurveofchlorophyll-aconcentrationinthenorthernzoneandwesternzonewerediferent.Thetendencyofchlorophyll-aconcentrationinabovetwozoneskeptsteadyinspring,decreasedinmiddleofsummerandthenincreasedtothesum—mitinaboutSeptember.Thereweresignificantdiferencesamongthreezonesinspringandwinter,meanwhile,thediferenceofchlorophyll-aconcentrationinothertwoseasonswasnotsignificant.Inspringandwinter,thechlorophyll-aconcentrationineasternzonewasapparentlylowerthanthatoftheothertwozones,w
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