Chemical Composition and Stocks of Soil Organic Matter in a South Brazilian Oxisol under Pasture

Santana, Graciele Sarante; Dick, Deborah Pinheiro; Tomazi, M.; Bayer, Cimélio; Jacques, Aino Victor Avila

doi:10.5935/0103-5053.20130108

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The increase in the aliphatic C to polysaccharides ratio (LF <MoM OM ) of the transect samples would indicate an increase in microbially processed organic matter in the MoM fraction (Puissant et al, 2017). The depletion of polysaccharides observed in the transect samples was consistent with previous analyses with FTIR on SOC fractions from pastures and forest soils (Santana, Dick, Tomazi, Bayer, & Jacques, 2013). Conversely, the increase in the relative peak area of the 1,000-1,100 cm −1 region of MoM OM spectra suggests the stabilization of polysaccharides and C-O groups with mineral surfaces.…”

Section: Discussionsupporting

confidence: 88%

Chemical composition of soil organic carbon from mixed aspen‐conifer forests characterized with Fourier transform infrared spectroscopy

Dobarco

Jacobson

Miegroet

2020

European J Soil Science

View full text Add to dashboard Cite

Forest species control the quantity and chemistry of organic matter input, which in interaction with the soil physicochemical properties, environmental conditions and microbial community associated with a given ecosystem may result in specific patterns of soil organic carbon (SOC) stabilization and chemistry. The objectives of this study were: (a) to characterize the chemistry of soil organic matter and SOC fractions across the gradient from pure aspen (Populus tremuloides Michx.) to pure conifer (Abies lasiocarpa (Hook.) Nutt. and Pseudotsuga menziesii (Mirbel) Franco) stands in semi‐arid montane forests, and (b) to determine whether the effect of overstory composition on SOC chemistry was patent beyond the influence of site conditions and microbial decomposer community. We used Fourier transform infrared spectroscopy to analyse the chemistry of bulk soil (BS), light fraction (LF) and mineral‐associated SOC (MoM) from mineral soils (0–15 cm) sampled across the natural gradient of aspen and mixed conifer stands from northern and southern Utah. Vegetation overstory had a subtle effect on the MoM fraction, indicating higher proportion of aliphatic C with aspen dominance, whereas there were no differences in LF chemistry between vegetation types. Independently of the vegetation cover type, the MoM fraction was enriched in aliphatic C compared to the LF, although the proportion of polysaccharides and C‐O groups increased in the MoM fraction for plot samples. Differentiation between spectra from soils developed on sedimentary rock and soils developed on basalt, quartzite and limestone, highlighted the influence of parent material and mineralogy on MoM chemistry. The patterns in SOC fractions' chemistry do not allow an affirmation that greater SOC storage under aspen is due to the accumulation of recalcitrant compounds (i.e., aliphatic C) and controlled by litter chemistry. Rather, they suggest that the ensemble of litter chemistry, microbial community and soil properties in aspen stands enhances SOC storage.Highlights Vegetation overstory and site characteristics (e.g., parent material) influence SOC chemistry and stabilization patterns. Light fraction SOC spectra did not differ between forest species in the aspen‐conifer ecotone. The proportion of aliphatic C in mineral‐associated organic carbon (MoM) increased with aspen dominance. The effect of overstory composition on MoM chemistry was patent beyond the influence of site conditions and microbial decomposer community.

show abstract

Section: Discussionsupporting

confidence: 88%

Chemical composition of soil organic carbon from mixed aspen‐conifer forests characterized with Fourier transform infrared spectroscopy

Dobarco

Jacobson

Miegroet

2020

European J Soil Science

View full text Add to dashboard Cite

show abstract

“…Na região nordeste do Rio Grande do Sul, mais precisamente nos Campos de Cima da Serra, a vegetação nativa é formada por áreas de campo associadas à floresta de araucária, que desempenham importante função ecológica na ciclagem de nutrientes e armazenamento de carbono do solo (POTES et al, 2010;SANTANA et al, 2013;GROPPO et al, 2015). Essa vegetação constitui um dos ecossistemas mais ameaçados do país (CARLUCCI et al, 2011) e continua sendo alterada e fortemente reduzida nas últimas décadas, especialmente pela crescente expansão das florestas plantadas com espécies exóticas, como pinus e eucalipto (OVERBECK et al, 2007;CUNHA et al, 2011), requerendo maior atenção e estudos para avaliar, quantificar e monitorar os impactos causados ao solo e ao meio ambiente como um todo, especialmente em avaliações de longa duração.…”

Section: Introductionunclassified

Atributos químicos do solo em plantios florestais em substituição à vegetação nativa em campos de altitude

Klug¹,

Mafra

Friederichs

et al. 2020

Ciênc. Florest.

View full text Add to dashboard Cite

Os plantios de espécies florestais exóticas vêm aumentando em áreas cobertas por vegetação nativa na região nordeste do Rio Grande do Sul, o que pode alterar as dinâmicas dos nutrientes no solo. Dessa maneira, o objetivo deste estudo foi avaliar os efeitos da mudança de uso da terra sobre pH e teores de carbono orgânico total (COT), Al3+, Ca2+, Mg2+ e K+ em Cambissolo Húmico, em plantios realizados em área de campo nativo. As áreas analisadas foram pinus plantado em 1963 (P) e eucalipto em 1991 (E), comparativamente a áreas adjacentes remanescentes: de campo nativo em regeneração natural a partir de 1990 (RN), mata nativa (MN) e campo nativo (CN). As amostras de solo foram coletadas nas profundidades de 0-5, 5-10 e 10-20 cm, em oito pontos para cada área avaliada, com cálculo de médias e intervalos de confiança (95%). Em geral, CN e MN apresentaram os maiores valores de COT. O plantio “P” apresentou em relação ao CN menores teores de COT, Ca e K na camada 0-10 cm, enquanto o plantio “E” apresentou menores teores de COT em relação ao CN, indicando efeitos negativos da floresta plantada em relação à vegetação natural campestre quanto à ciclagem de carbono e nutrientes. A área RN apresentou valores desses atributos similares aos do CN e MN. Avaliações em longo prazo são importantes para verificar influências do cultivo florestal sobre atributos do solo e identificar a sustentabilidade das formas de uso do solo.

show abstract

“…On the other hand, there are few regional studies considering how nitrogen and phosphorus soil contents will be affected in these integrated agricultural systems. Plot-level studies have reported a decrease in soil nitrogen stocks with cultivation in several N-fertilized areas of Brazil and under different cropping systems (Lima et al, 2011;Fracetto et al, 2012;Barros et al, 2013;Sacramento et al, 2013;Cardoso et al, 2010;Silva et al, 2011;Guareschi et al, 2012;Sisti et al, 2004;Santana et al, 2013;Sá et al, 2013). The same trend has been observed in Chernozem soils in Russia and in prairie soils of Wisconsin in the USA (Mikhailova et al, 2000;Kucharik et al, 2001).…”

mentioning

confidence: 99%

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Groppo

Lins²,

Camargo³

et al. 2015

Biogeosciences

View full text Add to dashboard Cite

Abstract. In this paper, soil carbon, nitrogen and phosphorus concentrations and stocks were investigated in agricultural and natural areas in 17 plot-level paired sites and in a regional survey encompassing more than 100 pasture soils In the paired sites, elemental soil concentrations and stocks were determined in native vegetation (forests and savannas), pastures and crop-livestock systems (CPSs). Nutrient stocks were calculated for the soil depth intervals 0-10, 0-30, and 0-60 cm for the paired sites and 0-10, and 0-30 cm for the pasture regional survey by sum stocks obtained in each sampling intervals (0-5, 5-10, 10-20, 20-30, 30-40, 40-60 cm). Overall, there were significant differences in soil element concentrations and ratios between different land uses, especially in the surface soil layers. Carbon and nitrogen contents were lower, while phosphorus contents were higher in the pasture and CPS soils than in native vegetation soils. Additionally, soil stoichiometry has changed with changes in land use. The soil C : N ratio was lower in the native vegetation than in the pasture and CPS soils, and the carbon and nitrogen to available phosphorus ratio (P ME ) decreased from the native vegetation to the pasture to the CPS soils. In the plotlevel paired sites, the soil nitrogen stocks were lower in all depth intervals in pasture and in the CPS soils when compared with the native vegetation soils. On the other hand, the soil phosphorus stocks were higher in all depth intervals in agricultural soils when compared with the native vegetation soils. For the regional pasture survey, soil nitrogen and phosphorus stocks were lower in all soil intervals in pasture soils than in native vegetation soils. The nitrogen loss with cultivation observed here is in line with other studies and it seems to be a combination of decreasing organic matter inputs, in cases where crops replaced native forests, with an increase in soil organic matter decomposition that leads to a decrease in the long run. The main cause of the increase in soil phosphorus stocks in the CPS and pastures of the plot-level paired site seems to be linked to phosphorus fertilization by mineral and organics fertilizers. The findings of this paper illustrate that land-use changes that are currently common in Brazil alter soil concentrations, stocks and elemental ratios of carbon, nitrogen and phosphorus. These changes could have an impact on the subsequent vegetation, decreasing soil carbon and increasing nitrogen limitation but alleviating soil phosphorus deficiency.

show abstract

Chemical Composition and Stocks of Soil Organic Matter in a South Brazilian Oxisol under Pasture

Cited by 7 publications

References 0 publications

Chemical composition of soil organic carbon from mixed aspen‐conifer forests characterized with Fourier transform infrared spectroscopy

Chemical composition of soil organic carbon from mixed aspen‐conifer forests characterized with Fourier transform infrared spectroscopy

Atributos químicos do solo em plantios florestais em substituição à vegetação nativa em campos de altitude

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Contact Info

Product

Resources

About