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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 the bottom layer of shallow sea in the biogeochemical cycling of carbon elements, the oxygen consumption rate of sediments in Sanggou Bay and Jiaozhou Bay of the Yellow Sea was measured by on-site sampling and culture method. Sediment oxygen consumption rates of Sanggou Bay in May and August were 15 and 24 mmol.m-2.d-1, respectively. August sediment oxygen consumption rate of Jiaozhou Bay was 18 mmol.m-2.d-1. Regression analysis showed that the oxygen consumption rate of sediment in the two bays was positively correlated with the contents of organic carbon and total nitrogen in sediment surface, respectively. Taking the quotient of respiration as 0.8, the mineralization rate of organic carbon in the bottom layer of Sangou Bay was 102% (May) and 67% (August) of the primary productivity of the water layer. The mineralization rate of organic carbon in the bottom layer of Jiaozhou Bay accounted for 28% primary productivity (August). The biosorption rate of particulate organic carbon from Sanggou Bay was 236 mg.m-2.d-1. The underlying organic carbon deposition efficiency was 40% (May) and 3% (August) Organic carbon accounted for 69% (May) and 2% (August) of the primary productivity of the aquifer; the natural deposition rate of particulate organic carbon in the Jiaozhou Bay was 251 mg.m-2.d-1, and the underlying organic carbon The efficiency is 32% (in August), with organic carbon being buried at 13% of primary productivity in the aquifer (August).