藻类生长对沉积物上磷迁移转化的影响  

Effect of Algae Growth on Phosphorus Migration and Transformation on Sediments

作　　者：李苓[1] 王彦 郭智俐 曹晓燕[1,2,3] LI Ling;WANG Yan;GUO Zhi-Li;CAO Xiao-Yan(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education Institute for Advanced Ocean Study,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]中国海洋大学海洋化学理论与工程技术教育部重点实验室海洋高等研究院,山东青岛266100 [3]青岛海洋科学与技术试点国家实验室海洋生态与环境科学实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2020年第3期88-94,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41676064);国家重点基础研究发展计划项目(2016YFA0601301)资助~~

摘　　要：通过模拟中肋骨条藻(Skeletonema costatum)和沉积物共存体系,探究了富营养化条件下,藻类与沉积物对无机磷的吸收/吸附作用的相互影响。采用自制的金汞伏安微电极测定了藻与沉积物共存体系中溶解氧(DO)的含量变化,分析了体系中溶解氧含量变化与磷消耗速率以及沉积物中磷形态分布变化之间的关系。结果表明,在本课题研究范围内,共存的藻类与沉积物互相影响彼此对磷的消耗过程,1.0×10^4、5.0×10^4和1.0×10^5 cells/mL三种初始藻密度的中肋骨条藻(Skeletonema costatum)48 h后对磷的吸收百分比分别达54.7%、73.4%、93.8%,添加沉积物后分别降至21.3%、34.1%和51.9%;沉积物对培养基介质中的无机磷的吸附百分比为42.5%,加入三种不同藻密度的藻体后分别降至9.1%、2.8%及0.3%。高密度藻与沉积物共存体系的耗磷速率与体系DO含量呈显著负相关(p<0.05)。体系中DO浓度降低会促进沉积物中Fe-P向水体中释放,从而导致沉积物中铁结合态磷(Fe-P)含量的降低。可交换态磷(Ex-P)、有机磷(OP)和Fe-P是藻类存在时沉积物向水体中较易释放的形态。The interaction between skeletonema costatum and sediment on the absorption/adsorption of inorganic phosphorus under eutrophication was investigated in this paper.In-situ measurement of dissolved oxygen(DO)in the system of skeletonema costatum and sediment was carried out by Au/Hg voltammetric microelectrode.The relationship between DO concentration and the rate of phosphorus consumption,as well as the migration of different phosphorus fractions were preliminary discussed.The results showed that algae and sediments interacted with each other to consume phosphorus in coexistence system under the research conditions of this study.The absorption percentages of phosphorus by skeletonema costatum with the initial cellular concentrations of 1.0×10^4,5.0×10^4 and 1.0×10^5 cells/mL after 48h were 54.7%,73.4%,and 93.8%,respectively,which decreased to 21.3%,34.1%and 51.9%after adding sediment.The percentage of phosphorus adsorbed by sediments in the medium was 42.5%,which respectively decreased to 9.1%,2.8%and 0.3%after adding skeletonema costatum with the three initial cellular concentrations as above.There was a significant negative correlation(p<0.05)between the phosphorus consumption rate and the concentration of DO only in the case of high cellular concentration.The decline of DO concentration promoted the release of Fe-P into the overlying water,thus resulting in a decrease in the content of Fe-P in sediment.In addition,Ex-P,OP and Fe-P were the forms which sediment preferentially released into overlying water in the presence of skeletonema costatum.

关 键 词：藻 沉积物 磷 富营养化 金汞伏安微电极 溶解氧 

分 类 号：P734.4[天文地球—海洋化学]