Human perturbations on the global biogeochemical cycles of coupled Si-C and responses of terrestrial processes and the coastal ocean
Human perturbations on the global biogeochemical cycles of coupled Si-C and responses of terrestrial processes and the coastal ocean
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DOI：
10.1016/j.apgeochem.2011.03.084
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发表时间：
2011-06-01
影响因子：
3.4
通讯作者：
Mackenzie, Fred T.
中科院分区：
文献类型：
--
作者：
Li, Darcy Dan;Lerman, Abraham;Mackenzie, Fred T.
我们提出了一个全球硅(Si)生物地球化学循环的模型，强调它与碳循环和温度的联系。由于硅酸盐矿物风化反应涉及大气中CO(2)的吸收和河流溶解二氧化硅、阳离子和碳酸氢盐的产生，硅循环是全球营养生物地球化学调节长期大气CO(2)浓度的重要部分。此外，重要的是，硅循环与N、P和Fe的其他营养循环紧密耦合；因此，硅质生物在全球初级生产力和生物量中占有相当大的比例。包括土地利用变化、化石燃料燃烧和无机氮磷肥料在内的人类干扰极大地改变了陆地硅的循环，改变了硅的河流流量，从而影响了海洋初级生产力，主要是在沿海海域。(C)2011爱思唯尔有限公司。保留所有权利。
We present a model of the global biogeochemical cycle of silicon (Si) that emphasizes its linkages to the carbon cycle and temperature. The Si cycle is a crucial part of global nutrient biogeochemistry regulating long-term atmospheric CO(2) concentrations due to silicate mineral weathering reactions involving the uptake of atmospheric CO(2) and production of riverine dissolved silica, cations and bicarbonate. In addition and importantly, the Si cycle is strongly coupled to the other nutrient cycles of N, P, and Fe; hence siliceous organisms represent a significant fraction of global primary productivity and biomass. Human perturbations involving land-use changes, burning of fossil fuel, and inorganic N and P fertilization have greatly altered the terrestrial Si cycle, changing the river discharge of Si and consequently impacting marine primary productivity primarily in coastal ocean waters. (C) 2011 Elsevier Ltd. All rights reserved.