20151014

Author : Lohila, A. Aurela, M. Regina, K. Laurila, T.
Year : 2003
Title : Soil and total ecosystem respiration in agricultural fields: effect of soil and crop type
Journal : Plant and Soil
Comment : 
 Their results showed that the soil respiration in the peat soil was 2–3 times as high as that in the mineral soils, varying from 0.11 to 0.36 mg (CO2) m−2 s−1 in the peat soil and from 0.02 to 0.17 mg (CO2) m−2 s−1 in the mineral soils. The difference between the soil types was mainly attributed to the soil organic C content, which in the uppermost 20 cm of the peat soil was 24 kg m−2, being about 4 times as high as that in the mineral soils.

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20170929

Author  :   M. Rial, A. Martínez Cortizas, L. Rodríguez-Lado Year  :  2017 Title  :  Understanding the spatial distribution of factors controlling topsoil organic carbon content in European soils Journal  :  Science of the Total Environment Comment   :  They present a modelling procedure for mapping and monitoring SOC contents  that uses Visible-Near Infrared (VNIR) spectroscopic measurements and a series of environmental  covariates to ascertain the key environmental processes that have a major contribution into SOC sequestration  processes.  Their results show that it follows a geographically non-stationary process in which the influencing environmental  factors have different weights depending on the spatial location.  This implies that SOC stock modelling  should not rely on a single model but on a combination of different statistical models depending on the  environment...
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Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland

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Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland Juan Jia     Zhenjiao Cao     Chengzhu Liu     Zhenhua Zhang     Li Lin     Yiyun Wang     Negar Haghipour     Lukas Wacker     Hongyan Bao     Thorston Dittmar     Myrna J. Simpson     Huan Yang     Thomas W. Crowther     Timothy I. Eglinton     Jin‐Sheng He     Xiaojuan Feng Subsoil contains more than half of soil organic carbon (SOC) globally and is conventionally assumed to be relatively unresponsive to warming compared to the topsoil. Here, we show substantial changes in carbon allocation and dynamics of the subsoil but not topsoil in the Qinghai‐Tibetan alpine grasslands over 5 years of warming. Specifically, warming enhanced the accumulation of newly synthesized ( 14 C‐enriched) carbon in ...
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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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