Role of organic matter and sesquioxides on variable charge of three soils from Galicia, Spain

Marcos, María Luisa Fernández; Buurman, P.; Meijer, E.L.

doi:10.1080/00103629809370123

Cited by 13 publications

(2 citation statements)

References 20 publications

(30 reference statements)

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“…The contribution rate of Fe d to the change of soil surface electrochemical properties was lower than that of organic matter and humus (Table 7). This view is consistent with Salazar et al [44], but contrary to Ketrot et al [45], which may be due to differences in the adsorption and complexation strength of clay minerals and metal oxides on organic matter in different soils [46][47]. Therefore, there were negative correlations between the Fe d and related electrochemical properties (Table 6).…”

Section: Effects Of Soil Organic/inorganic Colloidal Properties On Soil Surface Electrochemical Properties Of Karst Rocky Desertificationsupporting

confidence: 89%

Soil Surface Electrochemical Properties in a Karst Ecosystem and Its Response to Rocky Desertification Evolution, SW China

Zhao¹,

Sheng²,

Shu-xi³

et al. 2021

Pol. J. Environ. Stud.

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Rocky desertification control is an effective way to reconstruct degraded ecosystems and restore soil function in karst areas. Soil surface electrochemical properties, including soil surface potential, surface charge density, surface electric field strength, specific surface area, and surface charge number are important indicators for evaluating agricultural soil quality and environmental carrying capacity. However, little attention has been paid to the effect of rocky desertification succession on soil electrochemical properties. In this study, we selected a sequence of rocky desertification succession (nil, slight, moderate, and severe) to study the changes in soil surface electrochemical properties during the succession of rocky desertification. Our results showed that with increasing rocky desertification intensity, soil surface charge density, surface charge intensity, specific surface area, and the numbers of surface charge decreased, while the soil surface potential increases. The results showed that humus composition, soil particle size composition, and metal oxide content were important environmental factors that determine the electrochemical properties of soil surface in a karst rocky desertification area. In terms of impact on surface charge properties, soil properties displayed an order of humus>particle size composition>metal oxides. In addition, through the comparative analysis of soil physical properties and surface electrochemical properties, it was found that the surface soil aggregates of severe rocky desertification were more likely to disintegrate when precipitation occurs, thus facing a higher risk of soil erosion. Our results showed that the electrochemical properties of soil surface decrease with the increase of rocky desertification grades, which contributed to the decline of soil water and fertilizer

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Section: Effects Of Soil Organic/inorganic Colloidal Properties On Soil Surface Electrochemical Properties Of Karst Rocky Desertificationsupporting

confidence: 89%

Soil Surface Electrochemical Properties in a Karst Ecosystem and Its Response to Rocky Desertification Evolution, SW China

Zhao¹,

Sheng²,

Shu-xi³

et al. 2021

Pol. J. Environ. Stud.

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“…Soil properties are in agreement with typical characteristics of soils in Galicia, which generally present high percentages of organic matter and acid pH (<6.5) [30,31]. High N and P contents were mainly due to the application of cattle manure and commercial fertilisers, which also contributes to soil organic matter levels.…”

Section: Basic Statisticsmentioning

confidence: 66%

Source identification of heavy metals in pastureland by multivariate analysis in NW Spain

Franco‐Uría

López-Mateo

Roca

et al. 2009

Journal of Hazardous Materials

408

136

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Cation exchange properties of soils derived from lignite ashes

Zikeli¹,

Kastler

Jahn

2004

Z. Pflanzenernähr. Bodenk.

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In Saxony‐Anhalt, Germany, an area of about 6000 ha is covered by lignite‐ash‐derived substrates. In some cases, pollutants like heavy metals or toxic organic compounds had been disposed of together with the lignite ashes. For this reason, we assessed factors influencing the cation exchange capacity (CEC) of lignite‐ash substrates exposed to natural weathering.We chose four research sites reflecting the different methods of disposal: two dumped landfills and two lagooned ashes of different ages. After determining the CEC at pH 8.1 (CECpot), we evaluated the influence of the content of silt and clay and the content of total organic C. As lignite‐ash‐derived substrates are rich in oxalate‐extractable Si, Al, and Fe, we performed an oxalate extraction and determined afterwards the CECpot to assess the contribution of oxalate‐soluble compounds to the CECpot. Moreover, we determined the variable charge of selected samples at pH values ranging from 4 to 7.The lignite‐ash‐derived soils had a high CECpot with means ranging from 25.1 cmolc kg–1 to 88.8 cmolc kg–1. The influence of the parent material was more important than the degree of weathering. The content of total organic C consisting of pedogenic organic matter and coked lignite particles together with the content of silt and clay played a statistically significant role in determining the CEC.Another property that influenced the amount of CEC in medium textured lignite ashes was the content of oxalate‐soluble silica and aluminum. After oxalate extraction, they lost about 30% of their CEC due to the dissolution of oxalate‐soluble compounds. In coarse textured lignite ashes, oxalate extraction led to higher amounts of CEC, probably due to an increase of surface area resulting either from the disintegration of particles or from etching caused by insufficient dissolution of magnetite and maghemite. Moreover, lignite‐ash‐derived substrates exhibit a high amount of pH‐dependent charge. The CEC decreased by 40% in a topsoil sample and by 51% in a subsoil sample as the pH declined from 7 to 4.

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Role of organic matter and sesquioxides on variable charge of three soils from Galicia, Spain

Cited by 13 publications

References 20 publications

Soil Surface Electrochemical Properties in a Karst Ecosystem and Its Response to Rocky Desertification Evolution, SW China

Soil Surface Electrochemical Properties in a Karst Ecosystem and Its Response to Rocky Desertification Evolution, SW China

Source identification of heavy metals in pastureland by multivariate analysis in NW Spain

Cation exchange properties of soils derived from lignite ashes

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