Texture and sesquioxide effects on water-stable aggregates and organic matter in some tropical soils

Barthès, Bernard; Kouakoua, Ernest; Larré-Larrouy, Marie-Christine; Razafimbelo, Tantely; Luca, Edgar Fernando de; Azontonde, Anastase; Neves, Carmen Sílvia Vieira Janeiro; Freitas, P. L. de; Feller, Christian

doi:10.1016/j.geoderma.2007.10.003

Cited by 188 publications

(102 citation statements)

References 24 publications

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“…Indeed in these soils, physical protection within aggregates is not the main mechanism for OM stabilization as in temperate soils (Tisdall and Oades, 1982;Barthès et al, 2008). Barthes et al (2008) reported that the main factors which infl uence SOM accumulation and macroaggregate stabilization in 18 tropical soils was the soil content of Al-containing crystalline sesquioxides.…”

Section: Resultsmentioning

confidence: 99%

Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils

Razafimbelo

Chevallier²,

Albrecht

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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Soil organic carbon (SOC) is usually said to be well correlated with soil texture and soil aggregation. These relations generally suggest a physical and physicochemical protection of SOC within soil aggregates and on soil fi ne particles, respectively. Because there are few experimental evidences of these relations on tropical soils, we tested the relations of soil variables (SOC and soil aggregate contents, and soil texture) with the amount of SOC physically protected in aggregates on a set of 15 Malagasy soils. The soil texture, the SOC and water stable macroaggregate (MA) contents and the amount of SOC physically protected inside aggregates, calculated as the difference of C mineralized by crushed and intact aggregates, were characterized. The relation between these variables was established. SOC content was signifi cantly correlated with soil texture (clay+fi ne silt fraction) and with soil MA amount while protected SOC content was not correlated with soil MA amount. This lack of correlation might be attributed to the highest importance of physicochemical protection of SOC which is demonstrated by the positive relation between SOC and clay+fi ne silt fraction.

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Section: Resultsmentioning

confidence: 99%

Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils

Razafimbelo

Chevallier²,

Albrecht

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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“…Regarding macroaggregate stability (AGS), higher values were found under native vegetation and pasture, ranging from >70% in sandy soils (Lat_21S) to >90% in clay soils (Lat_23S). High AGS values are typically reported in studies on weathered Brazilian soils (e.g., Madari et al, 2005;Barthès et al, 2008), being associated primarily with a clay mineral composition dominated by Fe and Al oxides and 1:1 mineral layering in these soils (Six et al, 2000). In addition, Franco (2015) verified that soil macrofauna abundance plays important role in the soil aggregation processes in tropical soils; therefore, greater AGS under native vegetation and pasture are consistent with a greater abundance of soil engineering invertebrates (i.e., earthworms and termites) in these areas (Franco, 2015).…”

Section: Soil Physical Indicatorsmentioning

confidence: 87%

A Soil Management Assessment Framework (SMAF) Evaluation of Brazilian Sugarcane Expansion on Soil Quality

Cherubin

Karlen

Franco

et al. 2016

Soil Science Soc of Amer J

107

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The Soil Management Assessment Framework (SMAF) was developed to evaluate impacts of land use and management practices on soil quality (SQ), but its suitability for Brazilian tropical soils was unknown. We hypothesized that SMAF would be sensitive enough to detect SQ changes associated with sugarcane (Saccharum officinarum L.) expansion for ethanol production. Field studies were performed at three sites across the south-central region of Brazil, aiming to quantify the impacts of a land use change sequence (i.e., native vegetation-pasture-sugarcane) on SQ. Eight soil indicators were individually scored using SMAF curves developed primarily for North American soils and integrated into an overall Soil Quality Index (SQI) and its chemical, physical, and biological sectors. The SMAF scores were correlated with two other approaches used to assess SQ changes, soil organic C (SoC) stocks and Visual Evaluation of Soil Structure (VESS) scores. our findings showed that the SMAF was an efficient tool for assessing land use change effects on the SQ of Brazilian tropical soils. The SMAF scoring curves developed using robust algorithms allowed proper assignment of scores for the soil chemical, physical, and biological indicators assessed. The SQI scores were significantly correlated with SoC stocks and VESS scores. Long-term transition from native vegetation to extensive pasture promoted significant decreases in soil chemical, physical, and biological indicators. overall SQI suggested that soils under native vegetation were functioning at 87% of their potential capacity, while pasture soils were functioning at 70%. Conversions of pasture to sugarcane induced slight improvements in SQ, primarily because of improved soil fertility. Sugarcane soils are functioning at 74% of their potential capacity. Based on this study, management strategies were developed to improve SQ and the sustainability of sugarcane production in Brazil.Abbreviations: AGS, macroaggregate stability; BD, bulk density; BG, b-glucosidase activity; MBC, microbial biomass carbon; SMAF, Soil Management Assessment Framework; SQ, soil quality; SQI, soil quality index; SOC, soil organic carbon; VESS, Visual Evaluation of Soil Structure. S oil quality or health is a key factor required to achieve sustainable agricultural systems that will meet our increasing demands for food, feed, fiber, and fuels. Therefore, in recent decades SQ has been discussed worldwide and become a major agenda item for the scientific community (Karlen et al., , 2014a. Soil quality was defined as the capacity of a specific kind of soil to function, within natural or managed ecosystem boundaries, to sustain plant and animal productivity, maintain or enhance water and air quality, and support human health and habitation (Karlen et al., 1997 Core Ideas:• The SMAF efficiently detected soil quality changes under Brazilian tropical conditions.• Soil Quality Index was 0.87 (native vegetation), 0.70 (pasture), and 0.74 (sugarcane).• Sugarcane expansion improves soil quality, mainly due to increasing so...

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“…In soil profiles with lower soil organic matter (SOM) content, the main aggregation agents are Fe and Al oxides. The effect of these minerals on aggregate stability has been attributed to structural cementation, and is a subject extensively explored in the literature (Goldberg et al, 1988;Seta and Karathanasis, 1996;Pinheiro-Dick and Schwertmann, 1996;Barthès et al, 2008;Igwe et al, 2009). However, in soils with lower clay and Fe oxide content, aggregate stability is related to SOM (Six et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Aggregate Stability in Soil with Humic and Histic Horizons in a Toposequence under Araucaria Forest

Hanke

Dick

2017

Rev. Bras. Ciênc. Solo

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Aggregate stability is one of the most important factors in soil conservation and maintenance of soil environmental functions. The objective of this study was to investigate the aggregate stability mechanisms related to chemical composition of organic matter in soil profiles with humic and histic horizons in a toposequence under Araucaria moist forest in southern Brazil. The soils sampled were classified as Humic Hapludox (highest position), Fluvaquentic Humaquepts (lowest slope position), and Typic Haplosaprists (floodplain). The C and N contents were determined in bulk soil samples. The chemical composition of soil organic matter was evaluated by infrared spectroscopy. Aggregate stability was determined by applying increasing levels of ultrasound energy. Carbon content increased from the top of the slope to the alluvial plain. Higher ultrasonic energy values for clay dispersion were observed in the C-rich soils in the lower landscape positions, indicating that organic compounds play an important role in the structural stabilization of these profiles. Both aliphatic and carbohydrate-like structures were pertinent to aggregate stability. In the Oxisol, organo-mineral interaction between carbohydrates and the clay mineral surface was the most important mechanism affecting aggregation. In soils with a higher C content (Humaquepts and Haplosaprists), stabilization is predominantly conferred by the aliphatic groups, which is probably due to the structural protection offered by these hydrophobic organic groups.

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Texture and sesquioxide effects on water-stable aggregates and organic matter in some tropical soils

Cited by 188 publications

References 24 publications

Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils

Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils

A Soil Management Assessment Framework (SMAF) Evaluation of Brazilian Sugarcane Expansion on Soil Quality

Aggregate Stability in Soil with Humic and Histic Horizons in a Toposequence under Araucaria Forest

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