20151104

Author : Edmondson JL, Stott I, Potter J, Lopez-Capel E, Manning DA, Gaston KJ, Leake JR.
Year : 2015
Title : Black Carbon Contribution to Organic Carbon Stocks in Urban Soil
Journal : Environmental Science & Technology
Comment : Their findings emphasize the importance of considering the contribution of BC to TOC especially in urban soil profiles, and corroborates recent evidence that urban-specific factors are needed to estimate carbon stocks and their variability in urbanized regions. 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.

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20131218

Author  : Edmondson, J. L. Davies, Z. G. McHugh, N. Gaston, K. J. Leake, J. R. Year  : 2012 Title  : Organic carbon hidden in urban ecosystems Journal  : Scientific Reports Comment   : To date, the total quantity of OC stored in urban soils (under both impervious surfaces and greenspaces), together with that in above-ground vegetation, has never been systematically measured.  They report the first city-wide organic carbon (OC) budget for vegetation and soils, including under impervious surfaces. The majority of OC (82%) was held in soils, with 13% found under impervious surfaces, and 18% stored in vegetation.
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The concurrent decline of soil lead and children’s blood lead in New Orleans

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The concurrent decline of soil lead and children’s blood lead in New Orleans Howard W. Mielke ,  Christopher R. Gonzales ,  Eric T. Powell ,  Mark A. S. Laidlaw ,  Kenneth J. Berry ,  Paul W. Mielke  Jr. , and  Sara Perl Egendorf PNAS  first published October 14, 2019  https://doi.org/10.1073/pnas.1906092116 Significance The inextricable link between topsoil lead (Pb) and children’s blood lead (BPb) has not been widely accepted. Pb is associated with multiple health adversities. Urban residents are at risk from exposure to legacy Pb dust in topsoil resulting from smelting, industrial discharges, leaded gasoline emissions, leaded paint, and incineration. In New Orleans, topsoil median Pb decreased in ∼15 y from 99 mg/kg to 54 mg/kg, or ∼2.4 mg⋅kg⋅y −1 . In ∼12 y, children’s median BPb declined from 3.6 μg/dL to 1.3 μg/dL, or ∼0.2 μg⋅dL⋅y −1 . We argue that depletion of topsoil Pb is an important factor in the continuous dec...
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20140731

Author  : Chen, Y. J. Day, S. D. Shrestha, R. K. Strahm, B. D. Wiseman, P. E. Year  : 2014 Title  : Influence of urban land development and soil rehabilitation on soil-atmosphere greenhouse gas fluxes Journal  : Geoderma Comment   : Typical land development practices did not increase global warming potential (GWP) when compared to undeveloped land. Post-development soil rehabilitation, however, resulted in greater GWP than both undisturbed soils and those subjected to typical development practices driven primarily by increased CO2 efflux.
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