Comparison of two alkaline treatments in the extraction of organic compounds associated with water repellency in soil under Pinus taeda

Hansel, F. A.; Aoki, C. T.; Maia, C. M. B. de F.; Cunha, Anildo; Dedecek, Renato Antônio

doi:10.1016/j.geoderma.2008.10.002

Cited by 27 publications

(22 citation statements)

References 39 publications

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“…As known, the extracted SWR markers are all hydrophobic (Hansel et al, 2008;Atanassova and Doerr, 2010;de Blas et al, 2013); however, significant negative correlations still have been shown in relative abundance. For all soil categories, compared to long-chain compounds, the short-chain ones showed more negative linear relationships with SWR.…”

Section: Single Swr Markersmentioning

confidence: 87%

“…Regarding the relative concentrations of SWR marker groups, AS alcohol was the only group to show a significant relationship with SWR for all soils and subsoils. In addition, alcohols have been detected in water repellent soils and associated with SWR (Mainwaring et al, 2004;Hansel et al, 2008;Atanassova and Doerr, 2010). As AS alcohol does not comprise an abundant group in all AS extracts, the relationship between compound groups and SWR might not simply be explained by only a single compound group.…”

Section: Role Of Compound Groupsmentioning

confidence: 99%

“…Morley et al (2005) found large variations in SWR from extremely repellent to non-repellent sandy soil under grasses, at depths ranging from 0 to 40 cm. As vegetation is the primary input of organic matter to soils (Van Bergen et al, 1997;Kögel-Knabner, 2002), it is now well accepted that SWR is mainly the result of accumulated hydrophobic organic compounds in soils originally derived from vegetation (Bisdom et al, 1993;DeBano, 2000;Doerr et al, 2000;Horne and McIntosh, 2000;Hansel et al, 2008;de Blas et al, 2010de Blas et al, , 2013 and to a smaller extent from microbes (Hallett and Young, 1999;Feeney et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Predicting soil water repellency using hydrophobic organic compounds and their vegetation origin

Mao

Nierop

Rietkerk

et al. 2015

SOIL

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Abstract. It is widely accepted that soil water repellency (SWR) is mainly caused by plant-derived hydrophobic organic compounds in soils; such hydrophobic compounds are defined as SWR markers. However, the detailed influence of SWR markers on SWR is yet unclear and the knowledge of their original sources is still limited. The aims of this study are to select important SWR markers to predict SWR based on their correlation with SWR and to determine their origin. In our study, sandy soils with different SWR were collected, along with their covering vegetation, i.e. plant leaves/needles and roots. A sequential extraction procedure was applied to the soils to obtain three organic fractions: dichloromethane (DCM)/MeOH soluble fraction (D), DCM/MeOH insoluble fraction of isopropanol/ammonia solution (IPA/NH 3 ) extract (AI) and DCM/MeOH soluble fraction of IPA/NH 3 extract (AS), which were subdivided into 10 dominant SWR marker groups: D fatty acid, D alcohol, D alkane, AI fatty acid, AI alcohol, AI ω-hydroxy fatty acid, AI α,ω-dicarboxylic acid, AS fatty acid, AS alcohol and AS ω-hydroxy fatty acid. Waxes and biopolyesters of the vegetation were also sequentially extracted from plants. The soils with higher SWR have significantly higher relative concentrations of AS alcohols. A number of indications suggest that AS alcohols are mainly derived from roots and most likely produced by microbial hydrolysis of biopolyesters (mainly suberins). In addition, the strong correlation between the biomarkers of plant tissues and SWR markers in soils suggests that it is more accurate to predict SWR of topsoils using ester-bound alcohols from roots, and to predict SWR of subsoils using root-derived ω-hydroxy fatty acids and α,ω-dicarboxylic acids. Considering the sandy soils studied here, the relationships we obtained need to be tested for other types of soils. Our analysis indicates that plant roots have a primary role influencing SWR relative to plant leaves.

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Section: Single Swr Markersmentioning

confidence: 87%

Section: Role Of Compound Groupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting soil water repellency using hydrophobic organic compounds and their vegetation origin

Mao

Nierop

Rietkerk

et al. 2015

SOIL

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“…Segundo Franco et al (2000), análises físico-químicas da repelência à água em solos arenosos na Austrália indicaram que a fração anfifílica e polar da MO foi a que mais contribuiu com a hidrofobicidade do solo. Esta fração origina-se durante a decomposição e/ou degradação microbiana de componentes vegetais, principalmente derivados da cutina e da suberina (Hansel et al, 2008).…”

Section: Resultados E Discussão Extração De Substâncias Hidrofóbicasunclassified

“…Alguns tipos de vegetação estão associados com a maior produção de substâncias hidrofóbicas, principalmente espécies com considerável quantidade de resinas, ceras e óleos aromáticos, tais como as dos gêneros Pinus e Eucalyptus (Doerr et al, 2000). Os extratos hidrofóbicos obtidos de solos sob plantação de Pinus spp., como os usados neste estudo, são formados por derivados do ácido hidroxicinâmico; ácidos α,ω-alcanedióicos; ácidos alcanóicos; ácidos ω-hidroxialcanóicos e alcanóis (Hansel et al, 2008). A cutina e a suberina, possíveis fontes destas substânicas no solo, são especialmente ricas em ácidos ω-hidroxialcanóicos, sendo que a primeira apresenta principalmente componentes C16 e C18, enquanto que na última predominam componentes de cadeia longa de C16-C24 .…”

Section: Introductionunclassified

Influência da concentração de extratos hidrofóbicos na repelência à água em solos arenosos

Cambronero¹,

Maia²,

Dedecek³

et al. 2011

Pesq. Flor. Bras

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Resumo -A repelência à água é estudada em vários solos do mundo, sendo os casos mais extremos encontrados em solos arenosos. Acredita-se que a repelência à água seja causada pelo recobrimento das partículas do solo por compostos hidrofóbicos derivados da decomposição de plantas. Este trabalho avaliou a influência da concentração de extratos hidrofóbicos de um Neossolo sob plantio de Pinus taeda, na repelência à água em amostras de um solo arenoso preparado em laboratório, com diferentes teores de matéria orgânica. Os extratos hidrofóbicos do solo original foram extraídos com clorofórmio:acetona, seguido de isopropanol:amônia. Os tratamentos constaram de mistura de areia com sete níveis de matéria orgânica (0%; 3%; 6,5%; 6,5% + 10% de ácido húmico (AH); 6,5% + 30% de AH; 6,5% + 50% de AH; e 10%), aos quais foram aplicadas três concentrações de extrato hidrofóbico (CEH). As amostras foram secas a diversas temperaturas antes dos testes de repelência. As CEHs induziram à repelência à água nos tratamentos, em diferentes intensidades, porém estes valores foram inferiores aos encontrados no solo original. Os tratamentos com CEH de 2,88 g kg -1 tiveram os maiores tempos de repelência. Termos de indexação: Hidrofobicidade, Pinus taeda, WDPT. Water repellency of sandy soil as a function of hydrophobic concentrationAbstract -Soil water repellency has been reported worldwide being most extremes cases observed in sandy soils. Soil water repellency is accepted to be caused by recovering of soil particles by hydrophobic compounds originated from plant decomposition. This work aimed to evaluate the influence of concentration of hydrophobic extracts from a forest soil under Pinus taeda on water repellency of sandy soil with different organic matter content. Hydrophobic compounds were extracted from a severely hydrophobic Lithosol, using chloroform:acetone, followed by isopropanol:ammonia. The water drops penetration time test (WDPT) was applied in dried samples under four temperatures, seven treatments (sand with 0%; 3%; 6.5%; 6.5% + 10% of humic acid (AH); 6,5% + 30% of AH; 6.5% + 50% of AH; and 10% of charcoal as organic matter), and three levels of hydrophobic extract. The extracted material induced hydrophobicity in all treatments, in variable intensity, but lower than those found in the original Lithosol. Treatments with extract level 1 (2.88 g kg -1 ) presented the highest times of water repellency.

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Different composition and distribution patterns of mineral‐protected versus hydrolyzable lipids in shrubland soils

et al. 2017

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Mineral protection is known as an important mechanism stabilizing soil organic carbon (SOC). However, the composition, sources, and variations of mineral‐protected SOC remain poorly constrained. To fill this knowledge gap, we used hydrofluoric acid to demineralize soil matrix and compared the sources and distribution of mineral‐protected lipids (ML) versus hydrolyzable lipids (HL) of four typical Chinese shrubland soils. ML was found to represent a sizable fraction (9–32%) of total aliphatic lipids (including n‐alkanols; n‐alkanoic acids; α,ω‐alkanedioic acids; hydroxyalkanoic acids; and midchain‐substituted acids) in all soils. Based on carbon chain length and branch positions, microbe‐ and plant‐derived lipids were distinguished. No significant difference was found in the ratio of microbe‐ to plant‐derived lipids in ML versus HL, implying that plant and microbial inputs are equally important for the mineral‐associated soil lipids. However, ML contained a higher proportion of nonspecific lipids, especially at depths. Furthermore, to evaluate key environmental variable(s) controlling the distribution of different lipid components, a multiple stepwise regression analysis was conducted. Notably, ML was mainly affected by SOC‐to‐nitrogen ratio instead of mineralogical properties, implying that the accrual of mineral‐associated soil lipids relies strongly on organic matter properties. Collectively, our findings provide novel insights on sources and accumulation mechanisms of mineral‐protected soil lipids. SOC decomposition and subsequent accretion of degradation products appear to be vital for the sequestration of mineral‐associated soil lipids and warrant better recognition in the investigations of stable soil carbon accumulation mechanisms.

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Comparison of two alkaline treatments in the extraction of organic compounds associated with water repellency in soil under Pinus taeda

Cited by 27 publications

References 39 publications

Predicting soil water repellency using hydrophobic organic compounds and their vegetation origin

Predicting soil water repellency using hydrophobic organic compounds and their vegetation origin

Influência da concentração de extratos hidrofóbicos na repelência à água em solos arenosos

Different composition and distribution patterns of mineral‐protected versus hydrolyzable lipids in shrubland soils

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