太湖草源性_湖泛_水域沉积物营养盐释放估算

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1、J．LakeSci．(湖泊科学)，2014，26(2):177-184http://www．jlakes．org．E-mail:jlakes@niglas．ac．cn2014byJournalofLakeSciences*太湖草源性“湖泛”水域沉积物营养盐释放估算11，231，211＊＊申秋实，周麒麟，邵世光，刘成，张雷，范成新(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，南京210008)(2:中国科学院大学，北京100049)(3:河海大学水文水资源学院，南京210098)摘要:于太湖草源性“湖泛”暴发期，采

2、集柱状沉积物并应用peeper被动采样装置获得“湖泛”区原位沉积物间隙水．泥水样品分析表明:“湖泛”发生水域表层(0～7cm)沉积物的含水率、孔隙度和有机质含量均明显高于对照区，其中有机质含量更是对照区样品的4倍左右，沉水植物残体促使表层沉积物物化性质改变的作用明显;“湖泛”发生水域表层沉积物+2+间隙水中铵态氮(NH4-N)、溶解性反应磷(SＲP)及Fe含量远高于未发生区，植物残体降解对沉积物厌氧环境的营造+2+显著．运用分子扩散模型对沉积物释放通量估算:“湖泛”发生区沉积物NH4-N、SＲP和Fe的释放速率分别是对照区的49．

3、8、15．3和123．1倍．研究认为，草源性“湖泛”水体氮、磷等营养物含量升高的主要原因是沉积物的释放，而“湖泛”所营造的厌氧环境是氮、磷释放急剧增加的主要驱动因素．关键词:湖泛;氮;磷;沉积物释放;peeper;太湖Estimationofin-situsedimentnutrientsreleaseatthesubmergedplantinducedblackbloomareainLakeTaihu11，231，211SHENQiushi，ZHOUQilin，SHAOShiguang，LIUCheng，ZHANGLei＆FAN

4、Chengxin(1:StateKeyLaboratoryofLakeScienceandEnvironment，NanjingInstituteofGeographyandLimnology，ChineseAcademyofSciences，Nanjing210008，P．Ｒ．China)(2:UniversityofChineseAcademyofSciences，Beijing100049，P．Ｒ．China)(3:CollegeofHydrologyandWaterＲesource，HohaiUniversity，Nanj

5、ing210098，P．Ｒ．China)Abstract:DuringthesubmergedplantinducedblackbloomperiodinLakeTaihu，sedimentcoreswerecollectedandporewaterswereacquiredusingpeeperin-situpassiveporewatersamplersattheblackbloomandthecontrolareas．Thesedimentsanalysisre-sultsshowedthatthewatercontent，

6、porosityandorganicmatter(LOI)wereobviouslyhigherinthesurfacesediment(0-7cm)intheblackbloomareathanthoseinthecontrolarea，amongwhichtheLOIcontentswereabout4timeshigher．Thephysicaland+chemicalcharacteristicsofsurfacesedimentswereinfluencedbythesubmergedplantresiduesgreat

7、ly．Ammonium(NH4-N)，sol-2+ublereactivephosphorus(SＲP)andFecontentsinsurfaceporewatersattheblackbloomareaweresignificantlyhigherthan+2+thoseatthecontrolarea．ThesedimentreleasefluxesofNH4-N，SＲP，andFewerealsoestimatedbyusingtheporewaterdif-+2+fusionmodelapproach．Comparedt

8、othecontrolarea，thereleasefluxesofNH4-N，SＲP，andFeintheblackbloomareawere49．8，15．3，and123．1timeshigher，respectively．Theresear