绿潮藻类分解过程中水体磷-铁-硫含量的动态变化  

Dynamic Changes of Phosphorus, Iron and Sulfur Concentrations in Water during the Decomposition of Green Tide Algae

作　　者：徐书童 张文斌[1] 高丽[1] 魏烈群 XU Shutong;ZHANG Wenbin;GAO Li;WEI Liequn(Ocean School,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学海洋学院,山东烟台264005

出　　处：《生态环境学报》2019年第2期376-384,共9页Ecology and Environmental Sciences

基　　金：山东省自然科学基金面上项目(ZR2018MD018);国家自然科学基金项目(41273130);烟台大学研究生科技创新基金项目(YDZD1919)

摘　　要：以荣成天鹅湖暴发的硬毛藻和湖中心的沉积物为试材,通过室内模拟分析了不同密度藻类分解条件下水体可溶性磷(SRP)、Fe^(2+)、S^(2-)质量浓度以及主要理化参数的动态变化,以探讨硬毛藻分解对沉积物中铁磷释放的影响以及铁磷间的耦合关系,为藻华后水体富营养化以及内源污染的治理提供理论依据。在整个试验周期,不同藻密度条件下水体SRP、Fe^(2+)和S^(2-)的质量浓度变幅分别为0.004-0.89、0.04-0.50和0.02-17.36 mg·L^(-1);试验前期质量浓度较高,之后随时间呈下降趋势,后期各处理间差异减小。多重比较表明,残藻密度对上覆水中SRP、Fe^(2+)和S^(2-)的质量浓度均具有极显著影响(P<0.01);各处理质量浓度表现为:沉积物+50 g藻+水>沉积物+30 g藻+水>30 g藻+水>沉积物+10 g藻+水>沉积物+水。试验前期(1-7 d),各处理差异较大,其中沉积物+50 g藻+水与沉积物+30 g藻+水、沉积物+10 g藻+水处理间的SRP、Fe^(2+)、S^(2-)质量浓度差异均达极显著水平(P<0.01);沉积物+10 g藻+水与沉积物+水处理间Fe^(2+)质量浓度差异达显著水平(P<0.05)。藻分解过程中,上覆水磷铁之间、磷硫质量浓度间均呈显著正相关关系,r值分别为0.671(P=0.000)和0.498(P=0.013)。残藻密度越高,水体理化性质的变幅则越大。硬毛藻体内的磷和铁可在分解初期大量向水体释放,且高密度残藻的堆积分解可明显降低水土界面的氧化还原电位而促进沉积物中磷铁的释放,使得水体磷和铁质量浓度急剧增加。In this paper,the sediments in central lake and Chaetomorpha in Rongcheng Swan Lake were collected to study the changes and correlation relationship in concentrations of soluble reactive phosphorus(SRP),Fe2+and S2.in water under different algae densities during the decomposition by laboratory simulation test.In addition,some physicochemical indicators in water were monitored during the test.The aim of this paperis to discuss the effect of Chaetomorpha decomposition on the releases of iron and phosphorus from the sediments and the coupling relationship between iron and phosphorus.The results can provide a theoretical basis for the treatments of water eutrophication and internal pollution after algal blooms.During the whole period,the mass concentrations of SRP,Fe^2+and S^2-in water under different density conditions were 0.004.0.89,0.04.0.50 and 0.02.17.36 mg·L^-1,respectively.The concentration was higher in the early stage of the experiment,and then decreased with time.In the later stage,the difference in concentration among different treatments decreased.Multiple comparisons showed that algal density had a significant effect on the concentrations of SRP,Fe^2+and S^2-in overlying water(P<0.01).The order of SRP,Fe^2+and S^2-concentrations of different treatments was sediment+50 g algae+water>sediment+30 g algae+water>sediment+10 g algae+water>sediment+water.During the first 7 days,SRP,Fe^2+and S^2-concentrations in sediment+50 g algae+water treatment were all significantly higher than those in the treatments of sediment+30 g algae+water and sediment+10 g algae+water(P<0.01).There was both positive significant correlation between phosphorus and iron(r=0.671,P=0.000),phosphorus and sulfur(r=0.498,P=0.013)during the algal decomposition process.The higher the algae density was,the greater the variation was in the physico-chemical parameters in water.Phosphorus and iron in Chaetomorpha tissue could release into the water at the beginning of algal decomposition.The decomposition of high-density residual algae could red

关 键 词：藻分解 可溶性磷 亚铁离子 释放 

分 类 号：X17[环境科学与工程—环境科学]