The influence of weathering processes on labile and stable organic matter in Mediterranean volcanic soils

Barbera, Vito; Raimondi, Salvatore; Egli, Markus; Plötze, Michael

doi:10.1016/j.geoderma.2007.11.002

Cited by 30 publications

(19 citation statements)

References 38 publications

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“…5); this result is confirmed by previous studies (e.g. Barbera et al, 2008). The lower contents of aromatic functional groups indicated that they were preferably-oxidised by H 2 O 2 (Fig.…”

Section: Labile and Stable Organic Mattersupporting

confidence: 90%

Effect of north and south exposure on organic matter in high Alpine soils

et al. 2009

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The present work focuses on the subalpine range of the Italian Alps to determine the influence of aspect and consequently climate on soil humus properties and chemistry. This was done by comparing soils developing in north-and south-facing sites on siliceous parent material. The soils were investigated with respect to the total organic C and N content, C and N contents of organic matter (OM) density fractions and of labile(oxidised by H2O2) and stable (H2O2-resistant) fractions. Further characterisation of OM and the different fractions was performed with Diffuse Reflection Infrared Fourier Transform (DRIFT), Scanning Electron Microscopy/Electron Diffuse Scattering (SEM/EDS) and radiocarbon dating. The soils at north-facing slopes had a higher OM content. Density measurements and the H2O2 fractionation proved that this higher content was primarily due to a more pronounced accumulation of weakly degraded, labile organic materials when compared to the south-facing slopes. Independent of the sites, a large part of OM (around 50% of OM) was fixed in the densest fraction (N2 g/cm3) which correlated well with the abundance of the H2O2-resistant fraction. The 14C ages of the latter were up to 17,000 years, reflecting the presence of stable, refractory OM and the effectiveness of organo-mineral interactions in protecting OM from decay. Podzolisation has been more intense at north-facing sites. Due to the accumulation of weakly degraded OM, eluviation of Fe and Al is strongly enhanced. High-mountain ecosystems like the Alps are very sensitive to changing environmental conditions such as global warming. Especially at cooler sites, the obtained results suggest that a warmer climate, and thus more favourable conditions for biological activity, will lead in the short-to mid-term to an increased loss of accumulated, weakly degraded OM . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 and thus more favourable conditions for biological activity, will lead in the short-to mid-term 21to an increased loss of accumulated, weakly degraded OM. 22 23

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“…5); this result is confirmed by previous studies (e.g. Barbera et al, 2008). The lower contents of aromatic functional groups indicated that they were preferably-oxidised by H 2 O 2 (Fig.…”

Section: Labile and Stable Organic Mattersupporting

confidence: 90%

Effect of north and south exposure on organic matter in high Alpine soils

et al. 2009

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“…In thermogravimetry, such a treatment is heat, and the fraction of SOM that resists a given temperature is essentially considered a measure of recalcitrance (Angehrn-Bettinazzi et al, 1988). Oxidative treatments with either hydrogen peroxide (H 2 O 2 ) or persulphate (Na 2 S 2 O 8 ) have been proposed to isolate a refractory, highly stable fraction of SOM (Barbera et al, 2008;Bruun et al, 2008;Cuypers et al, 2002;Jagadamma et al, 2010). However, the most frequent approach is acid hydrolysis (Montané et al, 2007;Paul et al, 2006;Rovira and Vallejo, 2007;Silveira et al, 2008), very useful when combined with size fractionation .…”

Section: Introductionmentioning

confidence: 99%

Long-term effects of wildfires on the biochemical quality of soil organic matter: A study on Mediterranean shrublands

2012

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“…Warm, arid and semiarid soils include secondary minerals comprising crystalline Fe-oxyhydroxides and phyllosilicates that grade from dioctahedral smectite to mixed-layer smectite-kaolin and kaolinite or dehydrated/hydrated halloysite with increasing annual rainfall (Singer, 1966;Graham and Francovizcaino, 1992;Righi et al, 1999;Dekayir and El-Maataoui, 2002;Singer et al, 2004;Mirabella et al, 2005;Abayneh et al, 2006;Barbera et al, 2008;Egli et al, 2008). Warm, wet temperate and tropical soils generally exhibit secondary mineral fractions dominated by halloysite, hydroxy-Al interlayered smectite, gibbsite and crystalline Fe-oxyhydroxides because of high rates of desilication and generally moist soil conditions that favor hydrated kaolin phases (Kautz and Ryan, 2003;Van der Weijden and Pacheco, 2003;Ndayiragije and Delvaux, 2004;Kleber et al, 2007;Zhang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%