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OALib Journal期刊
ISSN: 2333-9721
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珠江口及近海表层沉积有机质的特征和来源
Keywords: 有机质,来源,碳同位素,珠江口,近海
Abstract:
？测定了珠江口及近海表层沉积物中总有机碳(toc),总氮(tn)及稳定碳同位素组成和几类主要有机化合物(水解氨基酸thaa、糖类tcho、脂类lipid、酸不溶有机物aioc),并分析了沉积有机质及化合物的特征和来源。结果表明珠江口表层沉积有机质主要为陆源和水生混合来源,而近海有机质主要为当地水生来源。大量的陆源高等植物(含有较多的木质素、纤维素等)输入珠江口,使得珠江口个别站位沉积物中糖类物质含量大幅高于近海样品;而珠江口与近海沉积物中水生来源有机质的含量相当。氨基酸和糖类占toc的份额在浮游生物和悬浮颗粒物中分别为56%和48%,在表层沉积物中为19%,说明珠江口和近海的有机质从水柱到达沉积物-水界面的过程中经历了较充分的降解。珠江口样品中活性组分氨基酸和糖类占toc的份额低于近海,可能说明珠江口沉积有机质的降解程度高于近海。
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