Black Carbon Contribution to Organic Carbon Stocks in Urban Soil
Black Carbon Contribution to Organic Carbon Stocks in Urban Soil
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DOI：
10.1021/acs.est.5b00313
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发表时间：
2015-07-21
影响因子：
11.4
通讯作者：
Leake, Jonathan R.
中科院分区：
文献类型：
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作者：
Edmondson, Jill L.;Stott, Iain;Leake, Jonathan R.
在陆地生态系统中，土壤中有机碳（TOC）的含量占总储量的75%。这包括生态系统衍生的有机碳（OC）和黑碳（BC），黑碳是化石燃料和生物质不完全燃烧的产物。城市表层土壤往往富集在BC从历史排放的烟尘和TOC浓度高，但在整个城市土壤剖面中的BC TOC的贡献，在区域尺度是未知的。我们对英格兰东北部的55个城市土壤剖面进行了采样，该地区有燃煤和重工业的历史。通过结合元素和热重分析，我们发现非常大的总土壤有机碳储量（31-65公斤米（-2）至1米），超过英国林地土壤的典型值报告。BC贡献了TOC储量的28-39%，高达23 kg C m（-2）至1 m，并受土壤质地的影响。富硼组分对土壤总有机碳的贡献比例随土壤深度的增加而增加，且在乔木下的表土中比草地中更富集。我们的研究结果确立了城市生态系统在土壤中储存大量OC的重要性，这些土壤也捕获了城市地区排放的大部分BC颗粒物。
Soil holds 75% of the total organic carbon (TOC) stock in terrestrial ecosystems. This comprises ecosystem-derived organic carbon (OC) and black carbon (BC), a recalcitrant product Of the incomplete combustion of fossil fuels and biomass. Urban topsoils are often enriched in BC from historical emissions of soot and have high TOC concentrations, but the contribution of BC to TOC throughout the urban soil profile, at a regional scale is unknown. We sampled 55 urban soil profiles across the North East of England, a region with a history of coal burning and heavy industry. Through combined elemental and thermogravimetic analyses, we found very large total soil OC stocks (31-65 kg m(-2) to 1 m), exceeding typical values reported for UK woodland soils. BC contributed 28-39% of the TOC stocks, up to 23 kg C m(-2) to 1 m, and was affected by soil texture. The proportional contribution of the BC-rich fraction to TOC increased with soil depth, and was enriched in topsoil under trees when compared to grassland. Our findings establish the importance of urban ecosystems in storing large amounts of OC in soils and that these soils also capture a large proportion of BC particulates emitted within urban areas.