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1、中国环境科学2014,34(5)：1285~1292ChinaEnvironmentalScience蓝藻暴发对巢湖表层沉积物氮磷及形态分布的影响1,211*11孔明,张路,尹洪斌,蔡永久,高俊峰(1.中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,江苏,南京210008；2.中国科学院大学,北京100049)摘要：以巢湖表层沉积物及上覆水体为对象,于蓝藻暴发前(4月)和蓝藻暴发期(7月)采集水样及沉积物样品,分析了氮磷及其形态赋存特征,并探讨了沉积物氮磷及其形态与蓝藻暴发的关系.结果发现,蓝藻暴发时
2、,巢湖表层沉积物总磷减少,总氮增加,同时削弱了磷在空间上分布+-的异质性.从氮磷形态来看,蓝藻暴发未造成巢湖表层沉积物氮形态(NH4-N、NO3-N和Org-N)含量和比例的明显波动,但却造成了活性磷(弱吸附态磷和铁铝结合态磷之和)含量及比例的下降,钙结合态磷(Ca-P)以及有机磷(OP)含量及比例增加,生物有效性磷(AAP)的含量的减小.相关性分析表明,上覆水中叶绿素a(Chl-a)的浓度与铁铝结合态磷(Fe/Al-P)以及有机磷(OP)的含量显著相关(P<0.05),却与氮形态(铵态氮,硝态氮和有机氮)相关
3、性不显著.巢湖沉积物磷(Fe/Al-P及AAP)对巢湖水体蓝藻暴发具有促进作用,而氮及其形态对蓝藻暴发作用较弱.关键词：蓝藻暴发；沉积物；氮磷；形态；生物有效性中图分类号：X524文献标识码：A文章编号：1000-6923(2014)05-1285-08Influenceofalgaebloomondistributionoftotalandspeciationofnitrogenandphosphorusinthesurface1,211*11sedimentsfromLakeChaohu.KONGMing,
4、ZHANGLu,YINHong-bin,CAIYong-jiu,GAOJun-feng(1.StateKeyLaboratoryofLakeScienceandEnvironment,NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China；2.UniversityofChineseAcademyofSciences,Beijing100049,China).ChinaEnvironmentalSci
5、ence,2014,34(5)：1285~1292Abstract：SurfacesedimentandoverlyingwaterfromLakeChaohuweresampledbefore(inApril)andafter(inJuly)algalbloom.Totalandspeciationofnitrogenandphosphorusinthesedimentswereanalyzed,andtheirrelationshipwithalgalbloomwasdiscussed.Algalbloom
6、couldincreasetheconcentrationsofnitrogenanddecreasetheconcentrationsofphosphorusfromsurfacesediments,andthereforeweakentheheterogenicityofsedimentphosphorusconcentrations.The+algalbloomdidnotcausetheobviousfluctuationofconcentrationsandproportionofnitrogensp
7、eciation(NH4-N,-NO3-N,Org-N),butdecreasetheconcentrationsandproportionofreactivephosphorus(LPandFe/Al-P)ratherthantheproportionandcontentofCa-boundP(Ca-P)insurfacesediments.Meanwhile,algalboomdecreasetheconcentrationsofsurfacesedimentbioavailablephosphorus(A
8、AP)inwholelake.CorrelationanalysisindicatedthattheconcentrationofChlorophyll-acorrelatedsignificantlywithFe/Al-boundP(Fe/Al-P)andorganicphosphorus(OP)(P<0.05)butwiththe+-nitrogenforms(NH4-N,NO3-
