Livestock grazing impact on soil wettability and erosion risk in post-fire agricultural lands

Stavi, Ilan; Barkai, D.; Knoll, Yaakov M.; Zaady, Eli

doi:10.1016/j.scitotenv.2016.03.126

Cited by 21 publications

(12 citation statements)

References 25 publications

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“…Yet, the detachment of the uppermost soil layer by the hoof action negated the moderate hydrophobicity formed by the fire. It was concluded that due to a decrease in the soil's shear resistance following the fire, the livestock hoof action in burnt lands detaches large quantities of mineral material from the ground surface [83]. These effects are illustratively summarized in Figure 3.…”

Section: Post-fire Ungulate Grazingmentioning

confidence: 99%

“…At the same time, the fire-derived water repellency of the uppermost soil layer is negated by the animal hoof action, which shears the 'baked' ground surface. Modified from Stavi et al [83].…”

Section: Post-fire Ungulate Grazingmentioning

confidence: 99%

“…According to Stavi et al [83], because of the high erodibility of the detached material by either water or wind, and in order to prevent land degradation, it is recommended to prevent livestock access to burnt lands shortly after the fire event. So far, however, among the topics reviewed and discussed in this study, the post-fire impact of livestock presence on soil properties, and particularly the soil quality and erodibility, is the least studied.…”

Section: Post-fire Ungulate Grazingmentioning

confidence: 99%

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Wildfires in Grasslands and Shrublands: A Review of Impacts on Vegetation, Soil, Hydrology, and Geomorphology

Stavi

2019

Water

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Wildfires are prevalent in grasslands and shrublands. The objective of this study is to provide land managers with a general overview, by assessing the main impacts of wildfire, including those on plant communities (e.g., secondary succession and species invasion), soil characteristics (e.g., water repellency (hydrophobicity), aggregation and structure stability, and contents of organic carbon and nutrients), and surface processes (e.g., ash deposition, ground surface clogging, water runoff, soil erosion, hillslope debris flow, and dry ravel). Additionally, the study discusses the effects of livestock grazing on the functioning of post-fire grasslands and shrublands. Although mesic regions are mentioned, this review focuses on drylands. The comparatively low-to-moderate fuel loads that characterize grasslands and shrublands generate wildfires of relatively moderate intensity, resulting in moderate burn severity. Yet, it seems that because of decreased soil aggregate stability following burning, the hoof action of livestock that access burnt lands shortly after the fire increases the shearing and detachment of mineral material from the ground surface; this increases soil erodibility, with the possible risk of accelerated land degradation. The review ends with an assessment of general implications for environmental sustainability and health, and provides recommendations on wildfire control in rangelands, and on restoration of burnt lands.

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Section: Post-fire Ungulate Grazingmentioning

confidence: 99%

Section: Post-fire Ungulate Grazingmentioning

confidence: 99%

Section: Post-fire Ungulate Grazingmentioning

confidence: 99%

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Wildfires in Grasslands and Shrublands: A Review of Impacts on Vegetation, Soil, Hydrology, and Geomorphology

Stavi

2019

Water

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“…The shear strength of a soil is defined as the maximum shear stress that it can sustain under loading (Türkel, 2007). According to Stavi et al (2016), the moisture content of a soil is a crucial parameter in controlling the shear strength of clays. Figure 7 shows the results of vane shear strength together with the corresponding moisture content.…”

Section: Undrained Shear Strengthmentioning

confidence: 99%

Simultaneous stabilization of Pb and improvement of soil strength using nZVI

Zhou

Liu

et al. 2019

Science of The Total Environment

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This study demonstrates the feasibility of nanoscale Zero-Valent Iron (nZVI) for simultaneous stabilization of Pb and improvement of soil strength via batch experiments. The soil samples were prepared using slurry and pre-consolidation method at nZVI doses of 0.2%, 1%, 5%, and 10% (by dry weight). The physicochemical and geotechnical properties of Pb-contaminated soil treated by nZVI were analyzed. The results indicate that the contamination of Pb(II) resulted in a notable reduction in the undrained shear strength of soil from 16.85 kPa to 7.25 kPa. As expected, the Pb in exchangeable and carbonate-bound fractions decreased significantly with the increasing doses of nZVI. Meanwhile, the undrained shear strength of Pb-contaminated soil enhanced substantially as the increase of nZVI, from 25.83 kPa (0.2% nZVI treatment) to 69.33 kPa (10% nZVI treatment). An abundance of bubbles, generated from the oxidation of nZVI, was recorded. The mechanisms for simultaneous stabilization of Pb and soil improvement primarily include: 1) the precipitation and transformation of Pb-/Fe-hydrated oxides on the soil particles and their induced bounding effects; 2) the increased drainage capability of soil as the occupation of nZVI aggregates and bubbles in the macropores space and 3) the lower soil density derived from the increase in microbubbles retained in the soil. This study is provided to facilitate the application of nZVI in the redevelopment of contaminated soil.

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“…A lot of research has already been conducted to reveal the impact of SWR on the soil ecosystem under forest and fire‐affected soils (Debano, 2000; Plaza‐Álvarez et al, 2018; Weninger, Filipovi, Me, Clothier, & Filipovi, 2019). However, because the degree of SWR in farmland tillage soil is smaller than the forest and fire‐affected soils (Lucas‐Borja et al, 2019; Stavi, Barkai, Knoll, & Zaady, 2016), there is a lack of research on the SWR in farmland, especially for the study on how conservation agriculture affect SWR. The small degree of SWR, known as subcritical water repellency (Hallett, Baumgartl, & Young, 2001), can also have a considerable effect on soil structure and hydraulic properties (Hunter, Chau, & Si, 2011; Tadayonnejad, Mosaddeghi, & Ghorbani, 2017).…”

Section: Introductionmentioning

confidence: 99%

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Liang

et al. 2020

Land Degrad Dev

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Soil water repellency (SWR) has significant effects on soil degradation by changing some soil processes (e.g., carbon sequestration and soil erosion). Understanding the influence factors of SWR under conservation agriculture are playing a vital role in the sustainable development for improving soil quality. However, how soil pore structure influence on SWR remains unclear. We aim to assess the impact of hydrophobic substances and pore structure on SWR. Here we conducted two long‐term experimental fields with three treatments: conventional tillage (CT), reduced tillage (RT), and no‐tillage (NT). X‐ray tomography and the sorptivity method were used to measure soil pore structure and SWR, respectively. We found that soil organic carbon (SOC) and microbial biomass carbon (MBC) were higher in RT and NT treatments than in CT. MBC had significant influences on soil water sorptivity (Sw) and water repellency index (RI; p < 0.001), whereas SOC had no influence on Sw (p > 0.05). MBC also showed a closer relationship with SWR than SOC in redundancy analysis. The RT and NT increased the porosity of 55–165 μm that had a positive relationship with ethanol sorptivity and RI (p < 0.05). Ethanol sorptivity increased with an increase in soil pore porosity and connectivity under RT and NT treatments. However, increasing the pore surface area could decrease Sw due to enhance contact area between hydrophobic substances and soil water. Overall, the RT and NT treatments increased the water repellency index, which was a result of the interactions between pore structure and hydrophobic substances.

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Livestock grazing impact on soil wettability and erosion risk in post-fire agricultural lands

Cited by 21 publications

References 25 publications

Wildfires in Grasslands and Shrublands: A Review of Impacts on Vegetation, Soil, Hydrology, and Geomorphology

Wildfires in Grasslands and Shrublands: A Review of Impacts on Vegetation, Soil, Hydrology, and Geomorphology

Simultaneous stabilization of Pb and improvement of soil strength using nZVI

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

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