摘要
为评价浅海海域底层在碳元素生物地化循环中的作用,采用现场取样培养法测定了黄海桑沟湾和胶州湾的沉积物耗氧率。桑沟湾5月和8月的沉积物耗氧率分别为15和24 mmol.m-2.d-1;胶州湾8月的沉积物耗氧率为18 mmol.m-2.d-1。回归分析表明,2个湾的沉积物耗氧率分别与沉积物表层的有机碳和总氮含量正相关。取呼吸商为0.8,得到桑沟湾底层对有机碳的矿化率占水层初级生产力的102%(5月)和67%(8月),胶州湾底层对有机碳的矿化率占水层初级生产力的28%(8月)。取桑沟湾颗粒有机碳的生物沉积速率为236 mg.m-2.d-1,得到底层对有机碳的埋置效率为40%(5月)和3%(8月),埋置的有机碳占水层初级生产力的69%(5月)和2%(8月);胶州湾颗粒有机碳的自然沉积速率为251 mg.m-2.d-1,底层对有机碳的埋置效率为32%(8月),埋置的有机碳占水层初级生产力的13%(8月)。
In order to evaluate the role of shallow water bottom sediment in geobiochemical cycle of carbon, the in-situ sample culture method was used to determine the sediment oxygen consumption rate in the Sanggou Bay and Jiaozhou Bay of the Yellow Sea. The sediment oxygen consumption rates in the Sanggou Bay in May and August were 15 mmol ·m^-2·d^-1 and 24 mmol ·m^-2·d^-1 ,respectively, and that in the Jiaozhou Bay in Augast was 18 mmol ·m^-2·d^-1. It is shown from the regression analysis results that the sediment oxygen consumption rates in the two bays were positively correlated with their organic carbon and nitrogen contents in the surficial sediments. If the respiration quotient is taken as 0.8, the organic carbon mineralization rates by the sediments of the Sanggou Bay in May and August amounted to 102 % and 67 of the primary productivity in the water column, respectively, and that by the Jiaozhou Bay ones in August amounted to 28 % of the primary productivity. If the POC biodeposition rate in the Sanggou Bay is taken as 236 mg ·m^-2·d^-1 , the organic carbon burial efficiencies of the bottom sediments in May and August were 40 % and 3%, respectively, and the buried organic carbons in May and August amounted to 69 and 2 ~ of the primary productivity in the water column, respectively. The POC natural deposition rate in the Jiaozhou Bay was determined as 250 mg ·m^-2·d^-1 ,th organic carbon burial efficiency of the bottom sediments in August was 32 %, and the buried organic carbon in August amouted to 13 % of the primary productivity in the water column of the Jiaozhou Bay.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2006年第1期91-96,共6页
Advances in Marine Science
基金
国家科技部国际科技合作重点项目--东海赤潮高发区铁
氮和磷生物地球化学循环及其对有害赤潮发生的影响和海岸带可持续利用研究(2002CB714008)
国家重点基础研究发展规划项目--近岸海域水质变化机理及生态环境效应(2002CB412406)
关键词
耗氧率
底层通量
有机碳矿化
有机碳埋置
oxygen consumption rate
bottom layer burial flux
organic carbon mineralization
organic carbon
