Effects of fire on the aggregate stability of clayey soils: A meta-analysis

Thomaz, Edivaldo Lopes

doi:10.1016/j.earscirev.2021.103802

Cited by 17 publications

(7 citation statements)

References 54 publications

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“…The burning process increases formation of soil aggregates (Ngole‐Jeme, 2019; Santín & Doerr, 2016; Thomaz, 2017), when Fe and Ca might be associating with organic matter in soil aggregates and being transformed into compounds such as iron oxide (Fe 2 O 3 ), calcium oxide (CaO) and calcium carbonate (CaCO 3 ). Aggregates are formed by the union of organic and mineral particles that interact and are grouped through soil “cementing” agents such as iron oxide, calcium carbonate and organic matter, providing physical and chemical benefits to the soil (Thomaz, 2021; Wang et al, 2020). By tracking soil regeneration over the months after slash‐and‐burn cultivation in China, Wang et al (2020) observed that iron oxide was determinant for soil carbon stock in the first months after burning.…”

Section: Discussionmentioning

confidence: 99%

Soil fertility in indigenous swidden fields and fallows in northern Amazonia, Brazil

Pinho

Pequeno

Alfaia

et al. 2023

Soil Use and Management

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In the northern Brazilian Amazon, indigenous peoples who inhabit the savannas of Roraima, plant their crop fields in frequently managed “forest islands” using a rotating “slash‐and‐burn” system. The system advocates long‐term sustainability, but population growth and threats to indigenous lands have led to shorter rotations and greater frequency of use of forest island areas. Our objective was to examine soil texture and fertility (0–20 cm in depth) in indigenous crop fields (roças) and fallow lands (capoeiras, secondary forests), generating recommendations that may help to optimize traditional soil management. Results indicated that roça sites are less acidic than capoeira sites, which was expected as ashes produced by burning are alkalizing, but acidity did not increase again after 8 months of cultivation, and pH was high in all sites (>6). The general increase in nutrients expected in roças compared with capoeiras did not occur. The expected decrease of soil fertility after first months of cultivation did not happen, nor the increase of soil fertility according to fallow length. Overall, soil texture proved to be the main determinant of fertility. The unexpected results suggest that the edaphic processes resulting from the traditional indigenous cultivations, practised for centuries or millennia in this region, likely contributed to the current stabilization of soil acidity and fertility. The stable moderate fertility and stable high pH observed in all sites are advantages for production in slash‐and‐burn systems in this region, and this is especially important for more pressured areas, where agroecological practices could improve soil use and management. Although not determinant for soil fertility recovery at the studied depth (0–20 cm), the fallow period (growth of capoeiras) is still important for recovery of environmental and social functions of forest islands.

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Section: Discussionmentioning

confidence: 99%

Soil fertility in indigenous swidden fields and fallows in northern Amazonia, Brazil

Pinho

Pequeno

Alfaia

et al. 2023

Soil Use and Management

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“…The increased frequency and intensity of forest fires is also a consequence of climate change. Soil properties are significantly altered by the heatwave accompanying a fire, in terms of both immediate effects and delayed modifications resulting from the changes in the soil's physical, chemical, and biological composition [51]. Apart from the dramatic impact on the biological activity of the soil, a fire greatly affects organic matter content.…”

Section: Effects Of Global Change On Contaminant Behaviourmentioning

confidence: 99%

Soil Remediation: Towards a Resilient and Adaptive Approach to Deal with the Ever-Changing Environmental Challenges

Grifoni¹,

Franchi

Fusini

et al. 2022

Environments

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Pollution from numerous contaminants due to many anthropogenic activities affects soils quality. Industrialized countries have many contaminated sites; their remediation is a priority in environmental legislation. The aim of this overview is to consider the evolution of soil remediation from consolidated invasive technologies to environmentally friendly green strategies. The selection of technology is no longer exclusively based on eliminating the source of pollution but aims at remediation, which includes the recovery of soil quality. “Green remediation” appears to be the key to addressing the issue of remediation of contaminated sites as it focuses on environmental quality, including the preservation of the environment. Further developments in green remediation reflect the aim of promoting clean-up strategies that also address the effects of climate change. Sustainable and resilient remediation faces the environmental challenge of achieving targets while reducing the environmental damage caused by clean-up interventions and must involve an awareness that social systems and environmental systems are closely connected.

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“…Firing also affects the biological and physical properties of soils such as water repellence, aggregate stability, and bulk density (Certini, 2005; Thomaz, 2017). Soil granulometry, and the type and amounts of cementing substances (organic substances, Fe–Al oxides, or calcium carbonate) are key variables that can either increase or decrease these parameters depending on the severity of the fire (Mataix‐Solera et al, 2011; Thomaz, 2021). Mineralogical transformation in soil is a complex process involving numerous factors.…”

Section: On the Origin Of Indurated Nodules In Soilsmentioning

confidence: 99%

Indurated soil nodules: A vestige of ancient agricultural practices?

et al. 2022

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The identification of controlled fires in ancient agricultural systems is important for understanding how past societies managed the landscape. Although the use of fire in agriculture is documented in recent historical records, and combustion markers can persist in soils over a long time scale, this is a complex issue because combustion traits in general are ubiquitous. Archaeopedological surveys undertaken in an ancient forest in Burgundy (France) have led to the recovery of several red indurated nodules scattered in the soils. Gallo-Roman housing structures and parcels were recognized using light detection and ranging mapping, stimulating questions about the understanding of the nature of these nodules. Elemental and structural analyses by X-ray fluorescence and X-ray diffraction (XRD) confirmed the local origin of these features by comparing their composition with on-site sediments, and thermoluminescence dating placed the samples in the Medieval period. The results cast light on the nature of the nodules and how they can be related to controlled fires used in agricultural practices. Even though questions remain about which processes lead to the formation of the nodules, the firing temperature estimated via XRD analysis seems to be in agreement with that used in the "paring-and-burning" technique. The present study provides new information about medieval agriculture practices from the 10th to the 12th centuries CE and shows how past societies managed the opening and maintenance of agricultural fields using natural resources and "archaeological" remains from the antique period.

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Effects of fire on the aggregate stability of clayey soils: A meta-analysis

Cited by 17 publications

References 54 publications

Soil fertility in indigenous swidden fields and fallows in northern Amazonia, Brazil

Soil fertility in indigenous swidden fields and fallows in northern Amazonia, Brazil

Soil Remediation: Towards a Resilient and Adaptive Approach to Deal with the Ever-Changing Environmental Challenges

Indurated soil nodules: A vestige of ancient agricultural practices?

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