20150612

Author : Schindlbacher, A. Wunderlich, S. Borken, W. Kitzler, B. Zechmeister-Boltenstern, S. Jandl, R.
Year : 2012
Title : Soil respiration under climate change: prolonged summer drought offsets soil warming effects
Journal : Global Change Biology
Comment : Their radiocarbon data suggest that heterotrophic and autotrophic respiration were affected to the same extent by soil warming and drying. Their results suggest that warming causes significant C losses from the soil as long as precipitation patterns remain steady at their study site. If summer droughts become more severe in the future, warming induced C losses will likely be offset by reduced soil CO2 efflux during and after summer drought.

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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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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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