【摘要】：通過對萊州灣-龍口灣表層沉積物樣品中總有機(jī)碳(TOC)、總氮(TN)、有機(jī)碳與總氮的比值(C/N)、穩(wěn)定碳氮同位素(δ13C、δ15N)生物地球化學(xué)指標(biāo)的測定,分析了該區(qū)域沉積物中有機(jī)質(zhì)的特征和來源.結(jié)果顯示,萊州灣表層沉積物中TOC含量為0.47%±0.40%,龍口灣TOC含量為0.82%±0.37%,TN含量相差不大,因此龍口灣沉積物有機(jī)質(zhì)相對含量高于萊州灣.港口的建設(shè)使龍口灣內(nèi)水體流速減慢,加上龍口灣入海河流較少,使得龍口灣沉積物平均粒徑(19.40μm)遠(yuǎn)低于萊州灣(43.89μm),比較容易吸附有機(jī)質(zhì).萊州灣沉積物中δ13C值為-24.96‰—21.46‰,平均值為-23.63‰;龍口灣表層沉積物中δ13C值為-23.02‰—22.39‰,平均值為-22.73‰.由此看來,萊州灣沉積物中有機(jī)質(zhì)主要來源于陸生C3植物和藻類,而龍口灣有機(jī)質(zhì)大部分來源于藻類,少數(shù)來自陸生C3植物.根據(jù)經(jīng)典的二元模式計算,龍口灣陸源有機(jī)質(zhì)的貢獻(xiàn)比例范圍為23.15%—33.67%,平均值為28.84%,萊州灣陸源貢獻(xiàn)比例范圍為7.65%—65.97%,平均值為43.75%.萊州灣沿岸有眾多河流入海,尤其是含沙量最多的黃河,給灣內(nèi)帶來大量的陸上有機(jī)質(zhì),而龍口灣入海河流較少,沉積物中的陸上有機(jī)質(zhì)較少.
[Abstract]:The characteristics and sources of organic matter in the sediments of Laizhou Bay and Longkou Bay were analyzed by measuring the ratio of total organic carbon (TOC),) total nitrogen to total nitrogen (C / N) and stable carbon and nitrogen isotopes (未 13C, 未 15N) in the surface sediments of Laizhou Bay and Longkou Bay. The results show that the content of TOC in surface sediments of Laizhou Bay is 0.47% 鹵0.40%, and the content of TOC in Longkou Bay is 0.82% 鹵0.37%, so the content of organic matter in sediments of Longkou Bay is higher than that in Laizhou Bay. With the construction of the port, the velocity of water in Longkou Bay is slower than that in Laizhou Bay (43.89 渭 m), and the average grain size of sediment in Longkou Bay (19.40 渭 m) is much lower than that in Laizhou Bay (43.89 渭 m),). The 未 13C values of sediments in Laizhou Bay ranged from -24.96 鈥，

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