【摘要】：通過(guò)對(duì)孟加拉灣中部110個(gè)表層沉積物樣品有機(jī)碳、氮含量及粒度進(jìn)行測(cè)試分析,揭示了研究區(qū)表層沉積物平均粒徑、有機(jī)碳(TOC)、總氮(TN)、有機(jī)碳/總氮(TOC/TN)的分布特征,并討論了其有機(jī)質(zhì)來(lái)源及控制因素。結(jié)果表明,研究區(qū)表層沉積物的平均粒徑值為6.2~7.6Φ,平均為7.1Φ,其分布呈現(xiàn)出以16°N和15°N為界南北兩側(cè)海域粒度相對(duì)較細(xì)(7Φ),中間海域相對(duì)較粗(7Φ)的特點(diǎn);研究區(qū)TOC的質(zhì)量分?jǐn)?shù)為0.37%~1.24%,平均為0.84%,TN質(zhì)量分?jǐn)?shù)為0.05%~0.15%,平均為0.10%,兩者分布特點(diǎn)相似,大致以15°N和16°N為界表現(xiàn)出南北兩側(cè)海域高,中間海域低的特點(diǎn);TOC/TN比值為6.05~12.88,平均為8.38,中部海域比值高,南北兩側(cè)低。根據(jù)TOC/TN比值估算研究區(qū)陸源和海洋自生有機(jī)質(zhì)的貢獻(xiàn),結(jié)果表明研究區(qū)陸源與海洋自生有機(jī)質(zhì)平均相對(duì)貢獻(xiàn)分別為60%和40%。研究區(qū)有機(jī)質(zhì)的分布主要受控于有機(jī)質(zhì)來(lái)源及輸運(yùn)方式,其中濁流輸運(yùn)導(dǎo)致的溢流沉積是其最主要的控制因素。另外,粒度、河流懸浮體的輸入沉降和有機(jī)質(zhì)保存條件等因素也起著重要作用。
[Abstract]:Based on the measurement and analysis of organic carbon, nitrogen content and particle size of 110 surface sediment samples in the central Bay of Bengal, the average particle size of surface sediments and the total nitrogen (TN), of organic carbon (TOC), in the study area were revealed. The distribution characteristics of organic carbon / total nitrogen (TOC/TN) were discussed, and the source and control factors of organic matter were discussed. The results show that the average grain size of the surface sediments in the study area is 6.2 鈮，

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