Carbonate precipitation in artificial soils produced from basaltic quarry fines and composts: An opportunity for passive carbon sequestration
Carbonate precipitation in artificial soils produced from basaltic quarry fines and composts: An opportunity for passive carbon sequestration
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DOI：
10.1016/j.ijggc.2013.05.012
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发表时间：
2013-09-01
影响因子：
3.9
通讯作者：
Ghazireh, N.
中科院分区：
文献类型：
--
作者：
Manning, D. A. C.;Renforth, P.;Ghazireh, N.
在7年的时间里，由白云石和玄武岩采石场细粉混合堆肥制备的人工土壤中不同碳库的比例发生了变化，无机碳作为碳酸盐矿物在土壤中新形成。由于施工后没有人工能源投入，这被认为是一个被动的矿物碳化过程。碳同位素数据表明，土壤碳酸盐中高达40%的碳来自光合作用，混合着来自地质来源的碳（采石场粉中存在的石灰岩）。土壤有机质组成变化很大，随着时间的推移，稳定碳相对于稳定碳的相对比例明显增加，这反映了土壤有机质组成的变化与新植物群落的建立有关。据估计，作为碳酸盐矿物的无机碳的积累速度相当于每年4.8吨碳公顷（-1），深度为0.3米，这与在含有拆迁废物的城市土壤中观察到的碳酸盐碳积累速度（每年3.0吨碳公顷（-1）至0.3米）一致。为碳捕获的目的而设计的人工土壤似乎具有巨大的潜力。这个过程类似于使用芦苇床从受污染的水中去除污染物。(C) 2013年作者。Elsevier B.V.版权所有。
The proportions of different carbon pools within artificial soils prepared by blending composts with dolerite and basalt quarry fines has changed over a period of 7 years, accumulating inorganic carbon as carbonate minerals newly formed within the soils. With no artificial energy inputs following construction, this is regarded as a passive mineral carbonation process. Carbon isotope data show that up to 40% of the carbon within the soil carbonate is derived from photosynthesis, mixed with carbon from geological sources (limestone present in the quarry fines). Organic matter within the soils shows very variable composition, with an apparent increase with time in the relative proportion of labile carbon relative to more stable forms, reflecting a change in the soil organic matter composition associated with the establishment of new plant communities. The rate of accumulation of inorganic carbon as carbonate minerals is estimated to be equivalent to 4.8 t C ha(-1) annually to a depth of 0.3 m, consistent with rates observed for accumulations of carbonate carbon in urban soils containing demolition wastes (annually 3.0 t C ha(-1) to 0.3 m). There appears to be substantial potential for artificial soils to be designed expressly for the purpose of carbon capture. The process is analogous to the use of reed beds for the removal of pollutants from contaminated waters. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.