Passive sequestration of atmospheric CO2 through coupled plant-mineral reactions in urban soils.
Passive sequestration of atmospheric CO2 through coupled plant-mineral reactions in urban soils.
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DOI：
10.1021/es301250j
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发表时间：
2013-01
影响因子：
11.4
通讯作者：
D. Manning;P. Renforth
中科院分区：
文献类型：
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作者：
D. Manning;P. Renforth
光合作用去除大气中的CO2是一种重要的行星CO2去除机制。自然，相当于所有大气碳的量在7年内通过耦合的植物-土壤系统。植物通过根系循环高达40%的光合作用碳，提供了深入土壤系统的C通量。根渗出的羧酸有可能为土壤溶液提供4-5微摩尔C hr（-1）g（-1）鲜重，并增强硅酸盐矿物风化。最终，这些根驱动过程的最终产物是CO（2），以碳酸氢盐的形式存在于溶液中。这与硅酸盐矿物风化腐蚀释放的钙结合，进入土壤-水系统，产生成土碳酸钙沉淀。将光合作用和植物根系生理学的理解与矿物风化的知识相结合，为设计人工土壤或规划土地利用提供了一个机会，通过人工增强成壤碳酸盐沉淀，最大限度地去除和封存大气中的CO（2）。这一过程所需的能源和基础设施投入相对较少。它提供了一种可持续的二氧化碳去除机制，类似于使用人工湿地被动修复受污染的沃茨，并有可能获得广泛的公众接受。
Photosynthetic removal of CO(2) from the atmosphere is an important planetary carbon dioxide removal mechanism. Naturally, an amount equivalent to all atmospheric carbon passes through the coupled plant-soil system within 7 years. Plants cycle up to 40% of photosynthesized carbon through their roots, providing a flux of C at depth into the soil system. Root-exuded carboxylic acids have the potential to supply 4-5 micromoles C hr(-1)g(-1) fresh weight to the soil solution, and enhance silicate mineral weathering. Ultimately, the final product of these root-driven processes is CO(2), present in solution as bicarbonate. This combines with Ca liberated by corrosion associated with silicate mineral weathering to enter the soil-water system and to produce pedogenic calcium carbonate precipitates. Combining understanding of photosynthesis and plant root physiology with knowledge of mineral weathering provides an opportunity to design artificial soils or to plan land use in ways that maximize removal and sequestration of atmospheric CO(2) through artificially enhanced pedogenic carbonate precipitation. This process requires relatively low energy and infrastructure inputs. It offers a sustainable carbon dioxide removal mechanism analogous to the use of constructed wetlands for the passive remediation of contaminated waters, and is likely to achieve wide public acceptance.