莱州湾沉积物有机质来源

THE SOURCE OF ORGANIC MATTER IN THE SEDIMENT OF LAIZHOU BAY

应用C/N、δ13C、δ15N解析了莱州湾沉积物有机质来源,发现湾内有机质主要存在海洋、河口浮游植物以及陆地有机质3种来源。通过C/N、δ13C定量示踪,发现海洋浮游植物是湾内沉积物有机质的最主要来源,相对含量在41.6%—58.5%之间。河口浮游植物有机质、陆源有机质相对含量波动较大,分别在3.8%—43.8%、0—53.5%之间。海洋浮游植物有机质在整个海湾都表现出较高含量。近岸河口附近海域往往表现出高含量的河口浮游植物有机质特征,陆源有机质含量较高区域大都集中在黄河口周围海域,高河口浮游植物有机质以及高陆源有机质特征在黄河口周围海域均有出现。

We analyzed the source of organic matter in the sediment of Laizhou Bay indicated by C/N,δ13C,and δ15N.Three types of source were recognized,i.e.,marine phytoplankton,estuary phytoplankton,and terrestrial organic matter.Calculation using C/N and δ13C indicated that organic matter from marine phytoplankton was the main source of sediment in the range of 41.6％-58.5％,while those from estuary phytoplankton and terrestrial organic matter ranged 3.8％-43.8％ and 0-53.5％,respectively.In specific,organic matter from marine phytoplankton exhibits higher content in the whole bay,the content of estuary phytoplankton organic matter was higher in estuaries areas,and that of the terrestrial ones were accumulated mostly near the Huanghe (Yellow) River estuary,in which the contents of estuary phytoplankton and terrestrial organic matter were high too.