Effect of human-controlled hydrological regime on the source, transport, and flux of particulateorganic carbon from the lower Huanghe(Yellow River)
Effect of human-controlled hydrological regime on the source, transport, and flux of particulateorganic carbon from the lower Huanghe(Yellow River)
复制标题
人为控制的水文状况对黄河下游颗粒有机碳来源、迁移和通量的影响
DOI：
10.1002/esp.3702
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发表时间：
2015
影响因子：
3.3
通讯作者：
Jun Li
中科院分区：
文献类型：
--
作者：
Bangqi Hu;Jun Li
评价河流转移的陆地有机碳（OC）和随后的埋藏在全球碳循环中的作用，需要河流OC的来源和通量进行评估，这仍然是限制在黄河（黄河）。本文报道了2012-2013年黄河入海口颗粒有机碳（POC）的元素、稳定同位素和放射性碳活度。研究表明，黄河流域POC可以用化石（POC fossil）和非化石（POC non ‐fossil）组分的二元混合来解释，前者可能占总POC的40%左右。黄河POC非化石主要来源于C3植物，平均停留时间为c。2200年。目前人为控制的水文情势强烈影响POC的来源、输送方式和通量。2012-2013年，黄河向海洋输送了0.73 Tg（1 Tg = 1012 g）的POC，其中约28%的POC通量发生在一次短时间的人为洪水事件中。从全球范围来看，黄河应该是化石有机碳转移和再埋藏最大的河流之一。然而，黄河化石OC的命运仍然是不受约束的，需要进一步调查。版权所有© 2015约翰威利父子有限公司
Evaluating the role of fluvial transfer of terrestrial organic carbon (OC) and subsequent burial in the global carbon cycle requires the sources and fluxes of fluvial OC to be assessed, which remains poorly constrained in the Huanghe (Yellow River). Here, we report the elemental, stable isotopic, and radiocarbon activity of particulate organic carbon (POC) sampled at the outlet of Huanghe in 2012–2013. We show that the Huanghe riverine POC can be explained by binary mixing of fossil (POCfossil) and non‐fossil (POCnon‐fossil) components, the former may reach ~40% of the total POC. The Huanghe POCnon‐fossilis mostly sourced from C3 plants, with a mean residence time ofc. 2200 years. The current human‐controlled hydrological regime strongly influenced the POC sources, transport modes, and fluxes. In 2012–2013, the Huanghe delivered 0.73 Tg (1 Tg = 1012g) of POC to the sea, and about 28% of the annual POC flux occurred within a short human induced flood event. Globally, the Huanghe should be one of the largest rivers in the transfer and re‐burial of fossil OC. However, the fate of Huanghe fossil OC is still unconstrained and needs to be further investigated. Copyright © 2015 John Wiley & Sons, Ltd.