Pedogenic, mineralogical and land-use controls on organic carbon stabilization in two contrasting soils

Plante, Alain F.; Virto, Iñigo; Malhi, S. S.

doi:10.4141/cjss09052

Cited by 19 publications

(20 citation statements)

References 34 publications

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“…However, in the semiarid soils of the studied transect, particulate OC contributed < 10 % of bulk OC, while mineral-bound OC accounted for > 90 % (Table 3). This contrasts with observations from the steppe soils (mostly Chernozems) of European Russia (Breulmann et al, 2014;Kalinina et al, 2011), Canada (Plante et al, 2010), and China (Steffens et al, 2010) in which particulate OC represented > 20 % of bulk OC. Nevertheless, our results are in line with Bischoff et al (2016), who reported that a maximum of 10 % OC was present as particulate OC in the Chernozems and Kastanozems of the Kulunda steppe.…”

Section: Partitioning and Composition Of Soil Om In Functionally Diffcontrasting

confidence: 89%

Organic matter dynamics along a salinity gradient in Siberian steppe soils

et al. 2018

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Abstract. Salt-affected soils will become more frequent in the next decades as arid and semiarid ecosystems are predicted to expand as a result of climate change. Nevertheless, little is known about organic matter (OM) dynamics in these soils, though OM is crucial for soil fertility and represents an important carbon sink. We aimed at investigating OM dynamics along a salinity and sodicity gradient in the soils of the southwestern Siberian Kulunda steppe (Kastanozem, non-sodic Solonchak, Sodic Solonchak) by assessing the organic carbon (OC) stocks, the quantity and quality of particulate and mineral-associated OM in terms of non-cellulosic neutral sugar contents and carbon isotopes (δ 13 C, 14 C activity), and the microbial community composition based on phospholipid fatty acid (PLFA) patterns. Aboveground biomass was measured as a proxy for plant growth and soil OC inputs. Our hypotheses were that (i) soil OC stocks decrease along the salinity gradient, (ii) the proportion and stability of particulate OM is larger in salt-affected Solonchaks compared to non-salt-affected Kastanozems, (iii) sodicity reduces the proportion and stability of mineral-associated OM, and (iv) the fungi : bacteria ratio is negatively correlated with salinity. Against our first hypothesis, OC stocks increased along the salinity gradient with the most pronounced differences between topsoils. In contrast to our second hypothesis, the proportion of particulate OM was unaffected by salinity, thereby accounting for only < 10 % in all three soil types, while mineral-associated OM contributed > 90 %. Isotopic data (δ 13 C, 14 C activity) and neutral sugars in the OM fractions indicated a comparable degree of OM transformation along the salinity gradient and that particulate OM was not more persistent under saline conditions. Our third hypothesis was also rejected, as Sodic Solonchaks contained more than twice as much mineral-bound OC than the Kastanozems, which we ascribe to the flocculation of OM and mineral components under higher ionic strength conditions. Contrary to the fourth hypothesis, the fungi : bacteria ratio in the topsoils remained fairly constant along the salinity gradient. A possible explanation for why our hypotheses were not affirmed is that soil moisture covaried with salinity along the transect, i.e., the Solonchaks were generally wetter than the Kastanozems. This might cause comparable water stress conditions for plants and microorganisms, either due to a low osmotic or a low matric potential and resulting in (i) similar plant growth and hence soil OC inputs along the transect, (ii) a comparable persistence of particulate OM, and (iii) unaffected fungi : bacteria ratios. We conclude that saltaffected soils contribute significantly to the OC storage in the semiarid soils of the Kulunda steppe, while most of the Published by Copernicus Publications on behalf of the European Geosciences Union. 14 N. Bischoff et al.: Organic matter dynamics along a salinity gradient OC is associated with minerals and is therefore effectively s...

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Section: Partitioning and Composition Of Soil Om In Functionally Diffcontrasting

confidence: 89%

Organic matter dynamics along a salinity gradient in Siberian steppe soils

et al. 2018

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“…This general trend can be explained by the zonal structure of organic accretions on mineral surfaces, as previously suggested by Kleber et al (2007). The preferential sorption of protein compounds (with small C:N ratio and a large (Kondo et al, 2010); Typic Cryoboralf (Plante et al, 2010); Haplocambid (Grasset et al, 2009); Natrixeralf (Golchin et al, 1994a); Hapludalf (Golchin et al, 1994a); Chromustert (Golchin et al, 1994a); Pellustert (Golchin et al, 1994a); Victoria Grey Clays (Golchin et al, 1994b); Acidic Dystric Cambisol (Hatton et al, 2011); Acidic Glossalbic Cambisol (Hatton et al, 2011) ; Pachic Xerumbrept (Castanha et al, 2008); Ultic Haploxeralf (Castanha et al, 2008). Soil taxa refer to either WRB or Soil Taxonomy.…”

Section: Relationship With a Multi-layer Sorption Modelsupporting

confidence: 68%

“…Filled markers correspond to the soil disaggregated by sonication and open markers correspond to the soil processed by manual agitation. The different soil types reported here are: Andic Dystrudept (Sollins et al , 2009); Inceptic Hapludox (Sollins et al , 2009); Typic Hapludalf (Sollins et al , 2009); Inceptisol (Sollins et al , 2009); Vermic Haplumbrept (this study); Feralsol (Basile‐Doelsch et al , 2009); Hydric Andosol (De Junet, 2008); Andosol (De Junet, 2008); Cambisol (De Junet, 2008); Dystric Cambisol (Kondo et al , 2010); Typic Cryoboralf (Plante et al , 2010); Haplocambid (Grasset et al , 2009); Natrixeralf (Golchin et al , 1994a); Hapludalf (Golchin et al , 1994a); Chromustert (Golchin et al , 1994a); Pellustert (Golchin et al , 1994a); Victoria Grey Clays (Golchin et al , 1994b); Acidic Dystric Cambisol (Hatton et al , 2011); Acidic Glossalbic Cambisol (Hatton et al , 2011); Pachic Xerumbrept (Castanha et al , 2008); Ultic Haploxeralf (Castanha et al , 2008). Soil taxa refer to either WRB or Soil Taxonomy.…”

Section: Discussionmentioning

confidence: 99%

“…Density thresholds were chosen according to the density of theoretical organo‐mineral complexes. The density (d OMC ) depends on (i) the mineral density (d M ), (ii) the density of sorbed organic compounds (d OM ), (iii) the mass fraction of organic compounds ( f ) and (iv) the porosity of the complexes (Plante et al , 2010). The porosity was disregarded in the present study because we used high energy dispersion by sonication (Schmidt et al , 1999).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Organic matter content and features related to associated mineral fractions in an acid, loamy soil

Bonnard

Basile‐Doelsch

Balesdent

et al. 2012

European J Soil Science

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Sorption of soil organic matter on mineral surfaces is now recognized as a major organic carbon (C) stabilization process. To investigate the role of organo-mineral interactions in carbon-rich soils, we separated organo-mineral associations by sequential density fractionation in the top- and subsoil of a forest Acrisol (umbrept) from southern France. Fractions were characterized by scanning electron microscopy, X-ray diffraction, elemental analysis, 13C NMR and δ13C. For each horizon, we isolated five types of association: light organic matter non-occluded, and occluded in aggregates (<1.9 g cm−3), and microaggregates formed by poorly crystallized mineral phases (1.9-2.2 g cm−3), by phyllosilicates (2.2-2.5 g cm−3) and by primary mineral particles weakly complexed with organic compounds (>2.5 g cm−3). Carbon accumulation in organo-mineral fractions was correlated with a relative enrichment in hydrophobic compounds (alkyl C or aromatic C). In contrast, the content in nitrogen and carboxylic groups was more constant. Poorly crystalline mineral phases stabilized the largest amount of soil organic matter. We compiled data from previous studies carried out on soils with different mineralogies (n = 20) and found a significant correlation between the δ13C and the C:N ratio of sorbed organic compounds according to the C content of fractions. This general trend is in line with the conceptual model of a zonal structure of soil organic matter sorbed on mineral surfaces. Furthermore, we hypothesized that the accumulation of hydrophilic (O-alkyl C) and hydrophobic (alkyl C and/or aromatic C) organic compounds on mineral surfaces is favoured by the structural organization of organo-mineral associations. The same organo-mineral associations were found in top- and subsoils, indicating similar stabilization processes in surface and deeper horizons

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“…The effect might be greater in coarser soils than in fine textured ones (Alvarez, 2005). The difference between soil organic matter quality (Plante et al, 2010) and initial soil organic matter content at both site might also influence the increase of soil C and N storage (Malhi et al, 2011a,b;Nyborg et al,1995;Campbell et al,1991Campbell et al, ,1997. Another reason might be attributable to the greater increase of crop residue C and N input by N fertilization when soil fertility was low (Malhi et al, 2011a,b).…”

Section: Nitrogen Fertilization and Tillage Reversal Increased Toc Anmentioning

confidence: 96%

Nitrogen fertilization and tillage reversal affected water-extractable organic carbon and nitrogen differentially in a Black Chernozem and a Gray Luvisol

Sun

Chang

Feng

et al. 2015

Soil and Tillage Research

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Pedogenic, mineralogical and land-use controls on organic carbon stabilization in two contrasting soils

Cited by 19 publications

References 34 publications

Organic matter dynamics along a salinity gradient in Siberian steppe soils

Organic matter dynamics along a salinity gradient in Siberian steppe soils

Organic matter content and features related to associated mineral fractions in an acid, loamy soil

Nitrogen fertilization and tillage reversal affected water-extractable organic carbon and nitrogen differentially in a Black Chernozem and a Gray Luvisol

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