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OALib Journal期刊
ISSN: 2333-9721
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百余年来珠江口及邻近西部海域有机碳来源及其埋藏记录*
Keywords: bit指标,沉积柱状样,有机碳,沉积通量
Abstract:
？对珠江口外和粤西沿海的两个具百余年沉积历史的柱状样进行了基于支链与类戊二烯甘油四醚(glyceroldialkylglyceroltetraether,gdgt)化合物比值的bit(branchedandisoprenoidtetraether)指标分析,该指标指示的是沉积有机质中陆源土壤来源有机质的相对输入贡献。结果发现,bit值在两个柱状样中都小于0.26,显示水生有机质是沉积有机质的主要来源。bit时间序列在两个柱状样中表现出一致的变化趋势:大约在1940年代以前,bit保持在相对稳定的高值,此后表现出逐渐下降趋势,1990年以来下降趋势显著。这一下降趋势表明,半个多世纪以来沉积有机质中陆源有机质的相对贡献是持续减少的,或者水生有机质的相对贡献是持续增加的。在分析了陆源和水生有机碳沉积通量变化序列的基础上,认为水生生产力对沉积有机质的相对贡献持续增大是bit指数持续降低的主要原因。水生有机碳输出通量半个多世纪来的上升趋势及其与广东省gdp变化趋势的相似性表明,陆地人类活动的不断增强导致了沿海水域营养化水平的不断升高。
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