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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Historical change of carbon burial in Late Quaternary sediments of the ancient Yellow River delta on the west coast of Bohai Bay, China
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Historical change of carbon burial in Late Quaternary sediments of the ancient Yellow River delta on the west coast of Bohai Bay, China

机译：中国渤海湾西海岸古代黄河三角洲后期季泥浆群的历史变迁

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摘要

The ancient Yellow River Delta (YRD) on the west coast of the Bohai Bay is possibly a huge carbon sink due to the high runoff and sediment load of the Yellow River, which transfers huge amounts of particulate carbon from terrestrial sources to the Bohai Sea. In this study, a 30.76 m long core (BXZK11), drilled in 2016, has been analyzed for AMS C-14 dating, grain size, foraminifera, organic carbon (OC), total nitrogen (TN), and stable carbon isotope ratios (delta C-13) to provide insights into the historical changes of carbon burial in Late Quaternary sediments of the ancient YRD. The results show that the sedimentary environments are divided into six depositional units in core BXZK11. The biggest contributor to organic carbon apparent mass accumulation rate (OCAMAR) is the negative covariance between apparent sedimentation rate (ASR) and OC. The average of OCAMAR is 20.76 g/(m(2) yr) during the Holocene. The rates are highest in delta front deposits and lowest in shallow sea environments. Compared with the modern YRD, BXZK11 exhibits rather low ASR and OCAMAR, indicative of the enormous variations of Yellow River sediment load into the sea and the significant difference of carbon sequestration capacity of YRD at different periods. C3 plants of the delta wetland gradually develop without C4 plant input as the delta transgresses after sea level stabilization. The sediments have been characterized by decreasing terrestrial organic matter (TOM) since 6500 cal. a BP, reflecting the decline of Yellow River freshwater discharge. Both the 8.2 ka event and the weak Asian monsoon summer event at 6265 cal. a BP correspond well with the low TOM in BXZK11. The implication is that climate may affect the dynamics of carbon burial by regulating terrestrial inputs.
机译：渤海湾西海岸的古代黄河三角洲（YRD）可能是黄河的高径流和沉积物负荷，这是一种巨大的碳水槽，从而将巨大的颗粒碳从地面从地面传递到渤海。在本研究中，2016年钻探的30.76米长的核心（BXZK11），已经分析了AMS C-14约会，粒度，面包酰胺，有机碳（OC），总氮（TN）和稳定的碳同位素比率（三角洲C-13）为古代yrd晚季沉积物中碳埋葬的历史变化提供见解。结果表明，沉积环境分为核心BXZK11中的六个沉积单元。有机碳表观质量积累率（OCAMAR）的最大贡献者是表观沉降率（ASR）和OC之间的负协方差。在全茂期间，OCAMAR的平均值为20.76克/（m（2）YR）。达到临时沉积物和浅海环境中最低的速率最高。与现代YRD相比，BXZK11表现出相当低的ASR和OCAMAR，表示黄河沉积物负荷进入大海的巨大变化以及YRD在不同时期的碳封存能力的显着差异。 Delta湿地的C3植物在没有C4植物的情况下逐渐发展，因为海平面稳定后的DELTA泛滥。自6500克拉以来，沉积物的特征在于降低陆地有机物（汤姆）。 BP，反映了黄河淡水排放的下降。 8.2 ka活动和弱势亚洲季风夏季活动均为6265 Cal。 BP在BXZK11中的低汤姆对应良好。这种含义是通过调节地面投入来影响气候可能影响碳埋葬的动态。

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