Carbon storage in a Holocene deltaic sequence: An example from the Nobi Plain, central Japan
Carbon storage in a Holocene deltaic sequence: An example from the Nobi Plain, central Japan
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DOI：
10.1016/j.quaint.2015.08.010
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发表时间：
2016-03
影响因子：
2.2
通讯作者：
Kodai Hasada;K. Hori
中科院分区：
文献类型：
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作者：
Kodai Hasada;K. Hori
通过分析2701个现有钻孔剖面和21814C年龄，重建三角洲系统的三维地层结构，计算三角洲中的沉积物体积，并使用从平原上8个钻孔的沉积物中测量的有机碳含量，我们估计了日本中部Nobi平原全新世沉积物中储存的有机碳（OC）的累积速率和总量。我们计算出，在过去的6000年中，共有167 Tg的OC存储在三角洲沉积平原上。自1000 cal BP以来，储存的OC量急剧增加，这可能是由于流域内人类活动导致三角洲沉积物供应增加以及由于洪水作用导致陆上三角洲面积扩大的综合结果。在过去的6000年中，Nobi平原的OC累积速率介于15.3至37.5 g m−2y−1之间，这与其他全新世三角洲的速率以及沉积物中OC含量较高的洪泛平原和湖泊系统的速率相当。三角洲沉积物较高的沉积速率弥补了其较低的有机碳含量。
We estimated the rate of accumulation and total amount of organic carbon (OC) stored in Holocene sediments of the Nobi Plain of central Japan by analyzing 2701 existing borehole sections and 21814C ages, reconstructing the three-dimensional stratigraphic architecture of the delta system, calculating the volume of sediments in the delta, and using OC contents measured from sediments from eight boreholes on the plain. We calculated that a total of 167 Tg of OC was stored in deltaic deposits on the plain during the past 6000 years. A dramatic increase in the amount of stored OC since 1000 cal BP is probably a combined result of increases in sediment supply to the delta in response to human activities in the drainage basin and expansion of the area of subaerial delta as a result of progradation. OC accumulation rates for the Nobi Plain during the past 6000 years ranged from 15.3 to 37.5 g m−2y−1, which are comparable to rates obtained from other Holocene delta, and to rates from floodplain and lake systems with higher OC contents in their sediments. The higher sedimentation rates of the deltaic deposits compensates for their lower OC contents.