20180111

Author : Chao Wang & Haiwei Wei & Dongwei Liu & Wentao Luo & Jianfeng Hou & Weixin Cheng & Xingguo Han & Edith Bai

Year : 2018

Title :  Depth profiles of soil carbon isotopes along a semi-arid grassland transect in northern China

Journal :  Plant Soil


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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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20170118

Author  :  Cornelia Rumpel and Ingrid Kögel-Knabner Year  :  2011 Title  : Deep soil organic matter - a key but poorly understood component of terrestrial C cycle Journal  :  Plant Soil Comment   :  The  aim of this paper is to synthesize literature concerning  the sources, composition, mechanisms of stabilisation and destabilization of soil organic matter stored  in subsoil horizons.  Despite their low carbon content, most subsoil horizons contribute to more than half of the total soil carbon stocks, and therefore need to be considered in the global carbon cycle. Organic C input into sub-soils occurs in dissolved form (DOC) following preferential flow pathways, as above-ground or root litter and exudates along root channels and/or through bioturbation. With few exceptions, the carbon-to-nitrogen (C/N) ratio is decreasing with soil depth, while the stable C and N isotope ratio...
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