底泥扰动下藻类对不同形态磷在水体中分布的影响

中国环境科学2015,35(9)：2787~2793ChinaEnvironmentalScience底泥扰动下藻类对不同形态磷在水体中分布的影响陈俊,李大鹏*,李勇,黄勇,袁怡,李祥(苏州科技学院环境科学与工程学院,江苏苏州215009)摘要：研究了反复扰动与藻类共存条件下,水体中溶解性磷、颗粒态磷、生物有效磷的分布规律,并分析了颗粒物质物理化学吸附与藻类生物利用对水体中磷消失的贡献率.结果表明,扰动抑制了水体中藻类生长,叶绿素a增加量仅为3.53µg/L(初始30µg/L)和4.80µg/L(初始120µg/L),而无扰动下该值分别为21.36µg/L(初始30µg/L)和14.49µg/L(初始120µg/L).并且,溶解氧水平和pH值均低于无扰动状态.扰动导致水体中总磷和颗粒态磷显著增加,但溶解性总磷(DTP)和溶解性磷酸盐(DIP)均有所降低.对于DTP而言,扰动状态下,颗粒物质吸附占90%,而无扰动下,则降低至60%,相应地,藻类生物利用则增加至40%.无论扰动与否,BAP基本处于稳定状态,而BAPP占BAP的百分比则有所增加.扰动状态下BAPP占PP的百分比明显低于无扰动状态.这暗示了扰动对水体中磷迁移和转化的作用大于藻.关键词：扰动；藻类；磷；迁移和转化；太湖中图分类号：X131.2文献标识码：A文章编号：1000-6923(2015)09-2787-07Distributionofdifferentphosphorusformsintheoverlyingwaterundersedimentdisturbancewithalgae.CHENJun,LIDa-peng*,LIYong,HUANGYong,YUANYi,LIXiang(SchoolofEnvironmentalScienceandEngineering,UniversityofScienceandTechnologyofSuzhou,Suzhou215009,China).ChinaEnvironmentalScience,2015,35(9)：2787-2793Abstract：Distributionofdissolvedphosphorus(P),particulateP(PP)andbiavailableP(BAP)wasinvestigatedintheoverlyingwaterundersedimentdisturbancewithalgae.Inaddition,thecontributiontoPdisappearancebyparticulatematteradsorptionandalgaeuptakewasinvestigated.Theresultsshowthatsedimentdisturbancehandledthealgaegrowthandtheconcentrationofchlorophyllaincreasedby3.53µg/L(initialchlorophylla30µg/L)and4.80µg/L(initialchlorophylla120µg/L).But,thevalueincreasedby21.36µg/L(initialchlorophylla30µg/L)and14.49µg/L(initialchlorophylla120µg/L)withoutdisturbance.Accordingly,theconcentrationofdissolvedoxygenandpHvaluewithdisturbancewaslightlyhigherthanthatwithoutdisturbance.Undersedimentdisturbance,totalPandPPincreased,whiledissolvedtotalP(DTP)anddissolvedinorganicP(DIP)decreased.Thedegradationwasattributedtotheparticulatematteradsorptionandalgaeuptake.Thecontributionofparticulatematteradsorptionisupto90%undersedimentdisturbance.Onthecontrary,thecontributiondecreasedto60%withoutdisturbance,butthealgaeuptakeincreasedto40%.TheconcentrationofBAPstabilizedintheexperimentwithandwithoutdisturbance,butthepercentageofbioavailab