A mosaic of nonallophanic Andosols, Umbrisols and Cambisols on rhyodacite in the southern Brazilian highlands

Dümig, Alexander; Schád, Péter; Kohok, Manmath; Beyerlein, Patrick; Schwimmer, Wolfgang; Kögel‐Knabner, Ingrid

doi:10.1016/j.geoderma.2008.01.013

Cited by 40 publications

(38 citation statements)

References 38 publications

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“…There is no significant contrast between the slopes of the two linear regressions obtained for heavy fractions with C 4 and C 3 signature as revealed by the test of homogeneity of slopes (Table 3). However, we did not find either evidence for a significant influence of soil texture, content of oxalate-and dithionite-soluble Fe and Al on soil colour lightness, or that those factors caused the difference between C 4 -and C 3 -derived heavy fractions (data from Du¨mig et al, 2008a). Caner et al (2003) showed that the darkest and most condensed humic acids were formed under grassland, whereas forest vegetation produced less dark organic matter and fewer condensed humic acids.…”

Section: Soil Organic Matter Signatures In Grassland With Long-term Fcontrasting

confidence: 68%

“…Soil Munsell colours showed that grasslands have black, and Araucaria forests dark brown, topsoils. In patches of Araucaria forest and forest sites bordering to grassland, the pedons darken with increasing depth to an extent comparable with the grassland soils (Du¨mig et al, 2008a). These are first indications that the change from grassland with long-term fire history to unburnt Araucaria forest alters the composition of SOM.…”

mentioning

confidence: 82%

“…For this study we analysed the Oa and Ah horizons from eight soils (Table 1), which are distributed in an area of approximately 700 hectares, to a depth of 63 cm. Detailed descriptions of field work, sampling, site and soil characteristics are given in Du¨mig et al (2008a). Seven soils were non-allophanic Andosols covered with Araucaria forest (F-I, F-II, F-III, FP, FB), shrubland (S) and grassland with shrubs (GS).…”

Section: Study Area and Soil Characteristicsmentioning

confidence: 99%

“…All soils are strongly acidic (pH H2O 4-5 and pH KCl 3.5-4.5) with large clay contents (500-700 g kg À1 ), which are composed of quartz, kaolinite, secondary chlorite and gibbsite. Munsell soil charts indicate that grassland soils are black and the forest topsoils dark brown and that pedons in patches of Araucaria forest get darker with increasing depth and become black like the grassland topsoils (Du¨mig et al, 2008a).…”

Section: Study Area and Soil Characteristicsmentioning

confidence: 99%

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Changes in soil organic matter composition are associated with forest encroachment into grassland with long‐term fire history

Dümig

Knicker

Schád

et al. 2009

European J Soil Science

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Summary This study investigates if Araucaria forest (C3 metabolism) expansion on frequently burnt grassland (C4 metabolism) in the southern Brazilian highland is linked to the chemical composition of soil organic matter (SOM) in non‐allophanic Andosols. We used the 13C/12C isotopic signature to group heavy organo‐mineral fractions according to source vegetation and 13C NMR spectroscopy, lignin analyses (CuO oxidation) and measurement of soil colour lightness to characterize their chemical compositions. Large proportions of aromatic carbon (C) combined with small contents of lignin‐derived phenols in the heavy fractions of grassland soils and grass‐derived lower horizons of Araucaria forest soils indicate the presence of charred grass residues in SOM. The contribution of this material may have led to the unusual increase in C/N ratios with depth in burnt grassland soils and to the differentiation of C3‐ and C4‐derived SOM, because heavy fractions from unburnt Araucaria forest and shrubland soils have smaller proportions of aromatic C, smaller C/N ratios and are paler compared with those with C4 signatures. We found that lignins are not applicable as biomarkers for plant origin in these soils with small contents of strongly degraded and modified lignins as the plant‐specific lignin patterns are absent in heavy fractions. In contrast, the characteristic contents of alkyl C and O/N‐alkyl C of C3 trees or shrubs and C4 grasses are reflected in the heavy fractions. They show consistent changes of the (alkyl C)/(O/N‐alkyl C) ratio and the 13C/12C isotopic signature with soil depth, indicating their association with C4 and C3 vegetation origin. This study demonstrates that soils may preserve organic matter components from earlier vegetation and land‐use, indicating that the knowledge of past vegetation covers is necessary to interpret SOM composition.

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Section: Soil Organic Matter Signatures In Grassland With Long-term Fcontrasting

confidence: 68%

mentioning

confidence: 82%

Section: Study Area and Soil Characteristicsmentioning

confidence: 99%

Section: Study Area and Soil Characteristicsmentioning

confidence: 99%

See 2 more Smart Citations

Changes in soil organic matter composition are associated with forest encroachment into grassland with long‐term fire history

Dümig

Knicker

Schád

et al. 2009

European J Soil Science

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“…in Bhutan: Baumler et al, 2005; in Brazil: Dümig et al, 2008;in California: Graham and O'Geen, 2010;Rasmussen et al, 2010; in the Pacific Northwest, USA: McDaniel and Hipple, 2010;in Spain: Estevez et al, 2016; and also in Italy: Iamarino and Terribile, 2008;Scarciglia et al, 2008;Vingiani et al, 2014;Raab et al, 2017;Mileti et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The hidden ecological resource of andic soils in mountain ecosystems: evidence from Italy

et al. 2018

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Abstract. Andic soils have unique morphological, physical, and chemical properties that induce both considerable soil fertility and great vulnerability to land degradation. Moreover, they are the most striking mineral soils in terms of large organic C storage and long C residence time. This is especially related to the presence of poorly crystalline clay minerals and metal-humus complexes. Recognition of andic soils is then very important.Here we attempt to show, through a combined analysis of 35 sampling points chosen in accordance to specific physical and vegetation rules, that some andic soils have an utmost ecological importance.More specifically, in Italian non-volcanic mountain ecosystems ( > 600 m a.s.l.) combining low slope (< 21 %) and highly active green biomass (high NDVI values) and in agreement to recent findings, we found the widespread occurrence of andic soils having distinctive physical and hydrological properties including low bulk density and remarkably high water retention. Most importantly, we report a demonstration of the ability of these soils to affect ecosystem functions by analysing their influence on the timescale acceleration of photosynthesis estimated by NDVI measurements.Our results are hoped to be a starting point for better understanding of the ecological importance of andic soils and also possibly to better consider pedological information in C balance calculations.

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Mineralischer Feinboden

Becher¹

2004

Handbuch Der Bodenkunde

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A mosaic of nonallophanic Andosols, Umbrisols and Cambisols on rhyodacite in the southern Brazilian highlands

Cited by 40 publications

References 38 publications

Changes in soil organic matter composition are associated with forest encroachment into grassland with long‐term fire history

Changes in soil organic matter composition are associated with forest encroachment into grassland with long‐term fire history

The hidden ecological resource of andic soils in mountain ecosystems: evidence from Italy

Mineralischer Feinboden

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