楚科奇海—加拿大海盆表层沉积物中的氨基酸

Amino Acids in Surface Sediment of Chukchi Sea-Canada Basin

对2003年中国第二次北极科学考察所获得的部分表层沉积物样品进行了总水解氨基酸(THAA)、氨基糖(HA)的测定。不同区域氨基酸主要成分不同,楚科奇海站位的氨基酸主要成分为甘氨酸(Gly)、谷氨酸(Glu),位于加拿大海盆的B80、B11、P27站THAA的主要成分为丝氨酸(Ser)。沉积物的总有机碳(TOC)、总氮(TN)、THAA、HA含量等特征随区域不同有较大差别,白令海峡的BS11站TOC、HA含量最低,加拿大海盆的B80站THAA、TN含量最低。楚科奇海R03站TOC、TN为最高,THAA在R11含量达最大值,HA在楚科奇海台的P11站最高。初步讨论了楚科奇海—加拿大海盆表层沉积物中氨基酸的空间分布,根据氨基酸选择性降解和主成份分析结果引入DI"指标,并对七个站位表层沉积物有机质新鲜程度进行了比较,新鲜度由大至小顺序为C15>BS11>R11>S11>P11>R03>B80,这与表层沉积物来源、水动力条件等有关,由此推测楚科奇海陆架、白令海峡沉积物有机质较楚科奇海台、加拿大海盆较为新鲜。

Abstract The Cruise of Chinese Second Arctic Science Expedition were conducted from July to September 2003, The concentrations of total hydrolyzable amino acids （ THAA）, hexosamines （HA） in the Chukchi Sea and Canada Basin surface sediment samples were measured. The major compositions were different between areas, in Chukchi Sea, Glutamic acid（ Glu）, Glycine （Gly） were the major forms of amino acid, while Serine（Ser） took the main part at the Stations B80, B11 ,P27 in Canada Basin, and features in sediments included total organic carbon（TOC） ,total nitrogen（TN） ,TH. AA, HA , etc. varied greatly with different areas, TOC, HA were lowest at BS11 and that THAA, TN were lowest at B80; TOC, TN were highest at R03 while R11 had the highest THAA and P11 had the hightest HA. The spatial variation of amino acids in surface sediments of Chukchi Sea-Canada Basin was discussed, DI was introduced according to amino acid selectiv matter degradation of the seven stations sed B80, the sequence was related to sediment e preservation and Principal Component Analysis to investigate the organic iments, by which we sort them as C15 〉BSll 〉Rll 〉Sll 〉Pll 〉R03 〉 sources and hydrographic conditions. This indicated Bering Strait organic matter in sediments was fresher than Chukchi Cape and Canada Basin, between which was Chukchi shelf.