Resilience of soils with different texture, mineralogy and organic matter under long-term conservation systems

Bonetti, João de Andrade; Anghinoni, Ibanor; Moraes, Moacir Tuzzin de; Fink, Jessé Rodrigo

doi:10.1016/j.still.2017.06.008

Cited by 85 publications

(49 citation statements)

References 28 publications

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“…These results emphasise that the soil strengthens over time after soil disturbance (Moraes et al, 2014), enabling the formation of stable aggregates (Moraes et al, 2017), and the formation of continuous pores within the soil profile (Reichert et al, 2016). Increased soil strength and hence σ p over time after soil disturbance can be explained by soil resilience (Bonetti et al, 2017), and the age-hardening phenomena (Moraes et al, 2017). In addition, similar results were observed in the AUC values when comparing MTC 1 to MTC 3 revealing that a 3-year interval after chiselling was enough to detect significant increases in σ p .…”

Section: Resultsmentioning

confidence: 72%

Soil load support capacity increases with time without soil mobilization as a result of age-hardening phenomenon

Moraes

Luz

Debiasi

et al. 2019

Soil and Tillage Research

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Soil compaction is a result of soil compression, and this effect depends on the pressure applied and the soil structure. Nevertheless, studies regarding the effects of long-term tillage systems on strengthening of particle bonds are scarce. Thus, we aimed to study the soil bond strengthening due to the age-hardening phenomenon using the soil load support capacity model of an Oxisol managed under different tillage systems in Southern Brazil. Soil samples were collected from three soil layers (0.0-0.10 m; 0.10-0.20 m and 0.20-0.30 m) and five soil tillage systems of conventional tillage; minimum tillage with chiselling performed every year or every three years; and no-tillage for 11 or 24 years. Age-hardening was investigated using the soil load support capacity model. Soil cores were equilibrated at four matric potentials (−6, −33, −100 and −500 kPa) and submitted to uniaxial compression tests to obtain preconsolidation pressure. The soil load support capacity models were affected by the tillage systems. The long-term no-tillage presented the highest soil load support capacity for the same bulk density and water content in all layers, demonstrating greater resistance to additional compaction. Higher preconsolidation pressure values in long-term no-tillage at the same soil bulk density and water content were attributed to the age-hardening phenomena, which increased the number and strength of bonds among soil particles, leading to higher soil cohesion. Longer time under no-tillage improves the soil structure and soil load support capacity. Thus, soil mobilization strongly affected the soil structure by breaking particle bonds leading to the greater compaction.

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Section: Resultsmentioning

confidence: 72%

Soil load support capacity increases with time without soil mobilization as a result of age-hardening phenomenon

Moraes

Luz

Debiasi

et al. 2019

Soil and Tillage Research

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“…The high content of organic C in this biochar (64%) improved the soil water retention [39,40] due to two factors: an increased number of contact points between the particles of the aggregates [41] and a structural rearrangement [42]. The formation of contact points within the aggregates was favored by wet-dry cycles [43], thus reducing the aggregate bulk density and increasing soil pore network and soil water retention at the same time. Thus, over time (from 50 to 150 days) soil water retention increases may be associated with the reconsolidation of soil structure, being governed by age-hardening phenomenon [41].…”

Section: Discussionmentioning

confidence: 98%

Biochar Amendment Enhances Water Retention in a Tropical Sandy Soil

et al. 2020

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The use of biochar, which is the solid product of biomass pyrolysis, in agricultural soils, has been shown as a strategic solution for building soil carbon stocks and mitigating greenhouse gas emissions. However, biochar amendment might also benefit other key soil processes and services, such as those that are related to water retention, particularly in sandy soils. Here, we conducted an experiment to investigate the potential of biochar to enhance pore size distribution and water retention properties in a tropical sandy soil. Three biochar rates were incorporated (equivalent to 6.25, 12.5, and 25 Mg ha−1) into plastic pots containing a sandy Oxisol sampled from a sugarcane field in Brazil. Undisturbed samples of the mixture were collected at two evaluation times (50 and 150 days) and used to determine water retention curves and other soil physical properties. The results showed that biochar amendment decreased soil bulk density and increased water retention capacity, micropore volume, and available water content. Higher soil water retention in amended soil is associated with the inherent characteristics of biochar (e.g., internal porosity) and potential improvements in soil structure. Microporosity and water retention were enhanced with intermediate biochar rate (12.5 Mg ha−1), instead of the highest rate (25 Mg ha−1) tested. Further studies are needed to validate these results under field conditions.

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“…Other soil parameters, such as soil organic matter, soil fauna and soil texture (Bonetti, Anghinoni, Moraes, & Fink, 2017;Porre, van Groenigen, De Deyn, de Goede, & Lubbers, 2016;Six et al, 2004;Vreeken-Buijs, Hassink, & Brussaard, 1998), are important for soil structuring and may contribute to the differences in changes in pore morphology and size observed in this study. However, irrespectively of the site-specific conditions (climatic, biological, chemical and physical), the results of the micromorphological and micromorphometrical analysis, together with the physical attributes provided by , Cherubin et al (2017), show that the soil compaction process occurs following LUC.…”

Section: Impacts Of Conversion From Pasture To Sugarcane On Soil MImentioning

confidence: 91%

Soil microstructure alterations induced by land use change for sugarcane expansion in Brazil

Canisares

Cherubin

Silva

et al. 2020

Soil Use and Management

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Land use change (LUC) alters soil structure and, consequently, the functions and services provided by these soils. Conversion from extensive pasture to sugarcane is one of the largest land transitions in Brazil as a result of the growth of the domestic and global demands of bioenergy. However, the impacts of sugarcane expansion on the soil structure under extensive pasture remains unclear, especially when considering changes at the microscale. We investigated whether LUC for sugarcane cultivation impacted soil microstructure quality. Undisturbed soil samples were taken from two soil layers (0–10 and 10–20 cm) under three contrasting land uses (native vegetation—NV, pasture—PA and sugarcane—SC) in three different locations in the central‐southern Brazil. Oriented thin sections (30 μm) were used for micromorphological analysis. The total area of pores decreased following the LUC in the following order: NV > PA > SC in both soil layers. The area of large complex packing pores (>0.01 mm²) also decreased with the LUC sequence: NV>PA>SC. Qualitative and semi‐quantitative micromorphological analysis confirmed porosity reduction was driven by the decrease in complex packing pores and that biological features decreased in the same LUC sequence as the quantitative parameters. Therefore, LUC for sugarcane expansion reduced microscale soil porosity, irrespectively of soil type and site‐specific conditions, indicating that the adoption of more sustainable management practices is imperative to preserve soil structure and sustain soil functions in Brazilian sugarcane fields.

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Resilience of soils with different texture, mineralogy and organic matter under long-term conservation systems

Cited by 85 publications

References 28 publications

Soil load support capacity increases with time without soil mobilization as a result of age-hardening phenomenon

Soil load support capacity increases with time without soil mobilization as a result of age-hardening phenomenon

Biochar Amendment Enhances Water Retention in a Tropical Sandy Soil

Soil microstructure alterations induced by land use change for sugarcane expansion in Brazil

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