Sources and influencing mechanisms of organic carbon in the western Bohai Sea over the past century
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摘要:
渤海西部海域沉积物中有机碳百年以来演化的控制因素和来源尚不明确。本文选取该海域4个柱状样沉积样品（ZY009、ZY035、ZY045和ZY054），基于210Pb年代学测定，分析了样品的粒度、有机碳、总氮、碳氮同位素变化特征，探讨了有机碳的来源、埋藏通量以及影响有机碳分布的控制因素。结果表明，百年以来黄河入海口及近岸海域沉积物主要为陆源和海源有机质的混合。有机碳主要富集在细粒沉积物中，其中ZY009柱状样75 cm以下以陆源有机质为主，而75 cm以上则以海洋溶解碳占主导；ZY054样品中的有机碳主要以黄河C3陆生植物为主。此外，有机碳的分布对黄河入海口5次迁移极为敏感，其中入海口的北移导致研究区有机碳含量增加，而南移则有机碳含量降低。在有机碳埋藏通量方面，自1886年以来，ZY009样品显示逐年递减的趋势，这可能与气候事件、黄河径流量和输沙量的减少有关，同时由于其距离河口较远，受到流域以及人类干扰较小。相反，ZY054样品自1886年以来有机碳埋藏通量呈现增加趋势，但在1988年后，由于黄河断流等因素，通量开始下降。2002年以后，由于人为调水调沙措施以及海岸带人类活动的增强，海洋初级生产力得到提升，进而导致靠近黄河入海口区域的有机碳埋藏通量增加。百年以来渤海西部海域沉积物中有机碳来源复杂，粒度特征、黄河入海口迁移和人类活动对有机碳的分布和埋藏通量具有显著影响。
Abstract:The controlling factors and sources of organic carbon in sediments of the western Bohai Sea over the past 100-year remain unclear. Taking the sediment samples of four stations (ZY009, ZY035, ZY045 and ZY054) in the western Bohai Sea as example, the grain size, organic carbon (TOC), total nitrogen (TN), and carbon, and oxygen isotopes (δ13C and δ15N) in the samples were analyzed and dated based on 210Pb chronology. The source of organic carbon, burial flux, and controlling factors on the distribution of organic carbon were studied. Results show that the organic matter in the sediment cores of the Yellow River estuary and coastal zone of the Bohai Sea is essentially a mixture of terrestrial and marine organic matter. Specifically, in borehole ZY009 below 75 cm is mainly terrestrial organic matter, and above 75 cm is mainly marine dissolved carbon, while in borehole ZY054, organic carbon from C3 land plants of the Yellow River were dominant. The distribution of organic carbon is highly sensitive to the five migrations of the Yellow River estuary in the last 100 years. The northward migration of the Yellow River estuary led to the increase of organic carbon content in the study area, while the southward migration led to the decrease of organic carbon content. Since 1886, the organic carbon burial flux revealed in ZY009 core has been decreasing year by year due to the climatic change and reduction of the runoff and sediment transport in the Yellow River. As ZY009 is far from the estuary, the organic carbon burial flux is less disturbed by the river and human beings. Since 1886, the organic carbon burial flux in ZY054 core has been increasing, and began to decline since 1988 when the Yellow River was drying up. After 2002, due to artificial water and sediment control measures and increased human activities in the coastal zone, the primary productivity of the ocean has been increased, which in turn has led to an increase in the organic carbon burial flux in the area near the Yellow River estuary, resulting in the increase of organic carbon flux near the Yellow River estuary. In the past 100 years, the western Bohai Sea witnessed a complex interplay of factors on the sources of organic carbon in sediments. The characteristics of sediment grain size, the migration patterns of the Yellow River, and the effects of human activities each have exerted a notable impact on the distribution and burial flux of organic carbon in this region.
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Key words:
- organic carbon source /
- grain size /
- influencing mechanism /
- centennial time scale /
- western Bohai Sea
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