Soil aggregation and the stabilization of organic carbon as affected by erosion and deposition

Xiang, Wei; Cammeraat, Erik; Cerli, Chiara; Kalbitz, Karsten

doi:10.1016/j.soilbio.2014.01.018

Cited by 148 publications

(85 citation statements)

References 46 publications

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“…Gordon and Goni, 2004;Mayer, 1994b). Organic matter first develops associations with minerals during soil formation (Mayer, 1994a), and these 525 organo-mineral associations that evolve during soil mobilization and erosion are considered to influence the balance of preservation and oxidation (MarinSpiotta et al, 2014;Wang et al, 2014).…”

Section: River Basin 495mentioning

confidence: 99%

“…The progressive increase in stable carbon isotopic values of bulk (δ 13 C OC ) and long-chain fatty acids (δ 13 C LCFA ) from the marine sediment core towards the late Holocene has been interpreted as enhanced supply of C 4 -derived OC 660 sourced from the Deccan Plateau during the late Holocene triggered by changes in Indian monsoon strength and/or location (Gadgil et al, 2003;Sinha et al, 2011;Webster et al, 1998). Our new results from within the drainage basin lend support for a significant reorganization in sediment and OC provenance from lower to upper basin sources.…”

Section: Linkages Between Godavari Drainage Basin and Marine Sedimentmentioning

confidence: 99%

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Reconciling drainage and receiving basin signatures of the Godavari River system

Usman¹,

Kirkels²,

Zwart³

et al. 2018

Preprint

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Abstract. The modern-day Godavari River transports large amounts of sediment (170 Tg per year) and terrestrial organic carbon (OC terr ; 1.5 Tg per year) from peninsular India to the Bay of Bengal. The flux and nature of OC terr is considered to have varied in response to past climate and human forcing. In order to delineate the provenance and nature of organic matter (OM) exported 5 by the fluvial system and establish links to sedimentary records accumulating on its adjacent continental margin, the stable and radiogenic isotopic composition of bulk OC, abundance and distribution of long-chain fatty acids (LCFA), sedimentological properties (e.g. grain size, mineral surface area etc.) of fluvial (riverbed and riverbank) sediments and soils from the Godavari 10 basin were analysed and these characteristics were compared to those of a sediment core retrieved from the continental slope depocenter. Results show that river sediments from the upper catchment exhibit higher total organic carbon (TOC) contents than those from the lower part of the basin. The general relationship between TOC and sedimentological parameters (i.e., 15 mineral-specific surface area and grain size) of the sediments suggests that sediment mineralogy, largely driven by provenance, plays an important role in the stabilization of OM during transport along the river axis, and in preservation of OM exported by the Godavari to the Bay of Bengal. The stable carbon isotopic (δ 13 C) characteristics of river sediments and soils indicate that 20

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Section: River Basin 495mentioning

confidence: 99%

Section: Linkages Between Godavari Drainage Basin and Marine Sedimentmentioning

confidence: 99%

Reconciling drainage and receiving basin signatures of the Godavari River system

Usman¹,

Kirkels²,

Zwart³

et al. 2018

Preprint

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show abstract

“…Aggregation controls the processes and capacity of physical protection of SOC (Jastrow et al, 1996(Jastrow et al, , 2007, and thus the accumulation of soil organic matter (SOM) in many less managed and cultivated soils (Puget et al, 1995;Franzluebbers and Arshad, 1997;Six et al, 1998Six et al, , 1999Wang et al, 2014). According to the physical size, aggregates can be divided into macroaggregates (N250 μm diameter) and microaggregates (20-250 μm diameter) (Fig.…”

Section: Aggregate C Sequestration In Soilsmentioning

confidence: 99%

“…Although many processes (e.g., soil humidity and temperature fluctuation, bioturbation, tillage and erosion) may affect aggregate C sequestration, soil clay content and type may also play an important role in SOC stabilization by affecting aggregate dynamics (Oades, 1993;Six et al, 2000Six et al, , 2004Wang et al, 2014). Physical protection of particulate organic matter within aggregates increases with increasing clay content (Franzluebbers and Arshad, 1997), and the mechanisms Table 2 Potential measures for C sequestration enhancement in agricultural ecosystems coupled with the silicon cycle (Lal, 2004a,b;Song et al, 2012aSong et al, , 2013a.…”

Section: Aggregate C Sequestration In Soilsmentioning

confidence: 99%

Biogeochemical silicon cycle and carbon sequestration in agricultural ecosystems

Song

Müller

Wang³

2014

Earth-Science Reviews

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“…Carbon in soils can be protected against decomposition by three key mechanisms: (i) inherent biochemical recalcitrance; (ii) organo-mineral associations, by interaction of organic molecules with mineral surfaces; and (iii) physical protection, making the SOC inaccessible to degraders/consumers within soil aggregates (Sollins et al, 1996;Six et al, 2002). These mechanisms are interactive (e.g., aggregation of organo-mineral associations could already include biochemically recalcitrant SOC) and their contribution to SOC stabilization is strongly influenced by soil environmental conditions and landform (Salomé et al, 2010;Berhe et al, 2012;Dungait et al, 2012;X. Wang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Soil redistribution and weathering controlling the fate of geochemical and physical carbon stabilization mechanisms in soils of an eroding landscape

et al. 2015

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Abstract. The role of eroding landscapes in organic carbon stabilization operating as C sinks or sources has been frequently discussed, but the underlying mechanisms are not fully understood. Our analysis aims to clarify the effects of soil redistribution on physical and biogeochemical soil organic carbon (SOC) stabilization mechanisms along a hillslope transect. The observed mineralogical differences seem partly responsible for the effectiveness of geochemical and physical SOC stabilization mechanisms as the mineral environment along the transect is highly variable and dynamic. The abundance of primary and secondary minerals and the weathering status of the investigated soils differ drastically along this transect. Extractable iron and aluminum components are generally abundant in aggregates, but show no strong correlation to SOC, indicating their importance for aggregate stability but not for SOC retention. We further show that pyrophosphate extractable soil components, especially manganese, play a role in stabilizing SOC within non-aggregated mineral fractions. The abundance of microbial residues and measured 14 C ages for aggregated and nonaggregated SOC fractions demonstrate the importance of the combined effect of geochemical and physical protection to stabilize SOC after burial at the depositional site. Mineral alteration and the breakdown of aggregates limit the protection of C by minerals and within aggregates temporally. The 14 C ages of buried soil indicate that C in aggregated fractions seems to be preserved more efficiently while C in nonaggregated fractions is released, allowing a re-sequestration of younger C with this fraction. Old 14 C ages and at the same time high contents of microbial residues in aggregates suggest either that microorganisms feed on old carbon to build up microbial biomass or that these environments consisting of considerable amounts of old C are proper habitats for microorganisms and preserve their residues. Due to continuous soil weathering and, hence, weakening of protection mechanisms, a potential C sink through soil burial is finally temporally limited.

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Soil aggregation and the stabilization of organic carbon as affected by erosion and deposition

Cited by 148 publications

References 46 publications

Reconciling drainage and receiving basin signatures of the Godavari River system

Reconciling drainage and receiving basin signatures of the Godavari River system

Biogeochemical silicon cycle and carbon sequestration in agricultural ecosystems

Soil redistribution and weathering controlling the fate of geochemical and physical carbon stabilization mechanisms in soils of an eroding landscape

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