Riverine coupling of biogeochemical cycles between land, oceans, and atmosphere
Riverine coupling of biogeochemical cycles between land, oceans, and atmosphere
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DOI：
10.1890/100014
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发表时间：
2011-02-01
影响因子：
10.3
通讯作者：
Yoo, Kyungsoo
中科院分区：
文献类型：
--
作者：
Aufdenkampe, Anthony K.;Mayorga, Emilio;Yoo, Kyungsoo
溪流、河流、湖泊和其他内陆水域是大陆、大气和海洋之间生物地球化学循环耦合的重要媒介。在全球尺度的碳(C)和其他生物活性元素评估中，对这些作用的描述仍然有限，但最近的研究结果表明，排放到海洋中的碳只是陆地生态系统通过土壤呼吸、淋滤、化学风化和物理侵蚀进入河流的碳的一小部分。大部分流入的碳以二氧化碳的形式从内陆水域返回到大气中，或埋藏在水库、湖泊、洪泛平原和其他湿地的沉积物中。碳和矿物循环是由侵蚀沉积过程和化学风化耦合的，化学风化产生溶解的无机碳和碳酸盐缓冲能力，强烈调节下游的pH值、碳酸钙壳的生物生产以及河流、河口和海岸带的二氧化碳排放。人类活动实质上影响着所有这些过程。
Streams, rivers, lakes, and other inland waters are important agents in the coupling of biogeochemical cycles between continents, atmosphere, and oceans. The depiction of these roles in global-scale assessments of carbon (C) and other bioactive elements remains limited, yet recent findings suggest that C discharged to the oceans is only a fraction of that entering rivers from terrestrial ecosystems via soil respiration, leaching, chemical weathering, and physical erosion. Most of this C influx is returned to the atmosphere from inland waters as carbon dioxide (CO2) or buried in sedimentary deposits within impoundments, lakes, floodplains, and other wetlands. Carbon and mineral cycles are coupled by both erosion deposition processes and chemical weathering, with the latter producing dissolved inorganic C and carbonate buffering capacity that strongly modulate downstream pH, biological production of calcium-carbonate shells, and CO2 outgassing in rivers, estuaries, and coastal zones. Human activities substantially affect all of these processes.