The wettability of ash from burned vegetation and its relationship to Mediterranean plant species type, burn severity and total organic carbon content

Bodí, Merche B.; Mataix-Solera, Jorge; Doerr, Stefan H.; Cerdà, Artemi

doi:10.1016/j.geoderma.2010.11.009

Cited by 137 publications

(94 citation statements)

References 59 publications

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“…As a result of this, 2 months after the fire the effects of soil colour on soil temperature may have been reduced. As in other grassland ecosystems, the fast vegetation recovery is an indicator that the ecosystem is resilient to the impacts of this type of fire (Bond and Parr, 2010;Lewis et al, 2009;Morgan, 1999;Wu et al, 2014).…”

Section: Soil Munsell Colour Valuementioning

confidence: 99%

Short-term changes in soil Munsell colour value, organic matter content and soil water repellency after a spring grassland fire in Lithuania

et al. 2014

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Abstract.Fire is a natural phenomenon with important implications on soil properties. The degree of this impact depends upon fire severity, the ecosystem affected, topography of the burned area and post-fire meteorological conditions. The study of fire effects on soil properties is fundamental to understand the impacts of this disturbance on ecosystems. The aim of this work was to study the short-term effects immediately after the fire (IAF), 2, 5, 7 and 9 months after a low-severity spring boreal grassland fire on soil colour value (assessed with the Munsell colour chart), soil organic matter content (SOM) and soil water repellency (SWR) in Lithuania. Four days after the fire a 400 m 2 plot was delineated in an unburned and burned area with the same topographical characteristics. Soil samples were collected at 0-5 cm depth in a 20 m × 20 m grid, with 5 m space between sampling points. In each plot 25 samples were collected (50 each sampling date) for a total of 250 samples for the whole study. SWR was assessed in fine earth (< 2 mm) and sieve fractions of 2-1, 1-0.5, 0.5-0.25 and < 0.25 mm from the 250 soil samples using the water drop penetration time (WDPT) method. The results showed that significant differences were only identified in the burned area. Fire darkened the soil significantly during the entire study period due to the incorporation of ash/charcoal into the topsoil (significant differences were found among plots for all sampling dates). SOM was only significantly different among samples from the unburned area. The comparison between plots revealed that SOM was significantly higher in the first 2 months after the fire in the burned plot, compared to the unburned plot. SWR of the fine earth was significantly different in the burned and unburned plot among all sampling dates. SWR was significantly more severe only IAF and 2 months after the fire. In the unburned area SWR was significantly higher IAF, 2, 5 and 7 months later after than 9 months later. The comparison between plots showed that SWR was more severe in the burned plot during the first 2 months after the fire in relation to the unburned plot. Considering the different sieve fractions studied, in the burned plot SWR was significantly more severe in the first 7 months after the fire in the coarser fractions (2-1 and 1-0.5 mm) and 9 months after in the finer fractions (0.5-0.25 and < 0.25 mm). In relation to the unburned plot, SWR was significantly more severe in the size fractions 2-1 and < 0.25 mm, IAF, 5 and 7 months after the fire than 2 and 9 months later. In the 1-0.5-and 0.5-0.25 mm-size fractions, SWR was significantly higher IAF, 2, 5 and 7 months after the fire than in the last sampling date. Significant differences in SWR were observed among the different sieve fractions in each plot, with exception of 2 and 9 months after the fire in the unburned plot. In most cases the finer fraction (< 0.25 mm) was more water repellent than the Published by Copernicus Publications on behalf of the European Geosciences Union. P. Pereira et al.: Sho...

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Section: Soil Munsell Colour Valuementioning

confidence: 99%

Short-term changes in soil Munsell colour value, organic matter content and soil water repellency after a spring grassland fire in Lithuania

et al. 2014

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“…Varies studies (e.g. Bodí et al, 2011;Larsen et al, 2009;Leighton-Boyce et al, 2007) have demonstrated that the presence of ashes can decrease overland flow generation.…”

Section: Overland Flow At the Maritime Pine Sitementioning

confidence: 99%

“…This difference could be explained by the marked reduction in the combined ash and litter cover from 85% before terracing to 5% afterwards and the associated increase in bare soil cover from roughly 10 to 90% (Fig. 4), through decreased interception, diminished soil sealing and/or reduced resistance to flow (Bodí et al, 2011;Larsen et al, 2009;Leighton-Boyce et al, 2007;Prats et al, 2012). Simultaneously, spatial variability in overland flow generation among the terraced Eucalypt plots was clearly smaller than among the non-terraced Eucalypt plots, with runoff coefficients that differed a factor 1.2 (36-44%) as opposed to a factor 6 (8-48%).…”

Section: Overland Flow At the Eucalypt Sitementioning

confidence: 99%

Runoff and inter-rill erosion in a Maritime Pine and a Eucalypt plantation following wildfire and terracing in north-central Portugal

Martins¹,

Machado²,

Serpa³

et al. 2013

Journal of Hydrology and Hydromechanics

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Abstract:The purpose of this study was to assess how terracing affected overland flow and associated sediment losses, at the micro-plot scale (0.25 m 2 ), in recently burnt stands of the two principal forest types in north-central Portugal, i.e. mono-specific stands of Maritime Pine and Eucalypt. Terracing is an increasingly common practice of slope engineering in the study region but its impacts on runoff and erosion are poorly studied. Non-terraced plots at the Eucalypt and the Pine site revealed similar median runoff coefficients (rc: 20-30%) as well as comparable median sediment losses (15-25 g m -2 ) during the first seven months following wildfire. During the ensuing, slightly wetter 18-month period, however, non-terraced plots at the Pine site lost noticeably more sediments (in median, 90 vs. 18 g m -2 ), in spite the runoff response had remained basically the same (median rc: 33 vs. 28%). By contrast, terraced plots at the same Pine site lost hugely more sediments (in median, 1,200 g m -2 ) during this 18-month period. Terraced plots at the Eucalypt site even lost three times more sediments (in median, 3,600 g m -2 ). Ground cover and resistance to shear stress seemed to be key factors in the observed/inferred impacts of terracing.

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“…The primary factors that control ash thickness are the spatial variability of fuels and fire severity. After a fire, it has been observed that the ash layer is gradually reduced (Bodí et al, 2011) and (re)distributed at different rates as a result of the effects of erosion by wind and water, topography of the burned area, dissolution, compaction, and incorporation into the soil profile .…”

Section: P Pereira Et Al: a Case Study Of A Burnt Grassland In Lithmentioning

confidence: 99%

Spatial models for monitoring the spatio-temporal evolution of ashes after fire – a case study of a burnt grassland in Lithuania

et al. 2013

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Abstract. Ash thickness is a key variable in the protection of soil against erosion agents after planned and unplanned fires. Ash thickness measurements were conducted along two transects (flat and sloping areas) following a grided experimental design. In order to interpolate data with accuracy and identify the techniques with the least bias, several interpolation methods were tested in the grided plot. Overall, the fire had a low severity. However, the fire significantly reduced the ground cover, especially on sloping areas, owing to the higher fire severity and/or less biomass previous to the fire. Ash thickness depended on fire severity and was thin where fire severity was higher and thicker in lower fire severity sites. The ash thickness decreased with time after the fire. Between 4 and 16 days after the fire, ash was transported by wind. The greatest reduction took place between 16 and 34 days after the fire as a result of rainfall, and was more efficient where fire severity was higher. Between 34 and 45 days after the fire, no significant differences in ash thickness were identified among ash colours and only traces of the ash layer remained. The omni-directional experimental variograms showed that variable structure did not change significantly with time. The ash spatial variability increased with time, particularly on the slope, as a result of water erosion.

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The wettability of ash from burned vegetation and its relationship to Mediterranean plant species type, burn severity and total organic carbon content

Cited by 137 publications

References 59 publications

Short-term changes in soil Munsell colour value, organic matter content and soil water repellency after a spring grassland fire in Lithuania

Short-term changes in soil Munsell colour value, organic matter content and soil water repellency after a spring grassland fire in Lithuania

Runoff and inter-rill erosion in a Maritime Pine and a Eucalypt plantation following wildfire and terracing in north-central Portugal

Spatial models for monitoring the spatio-temporal evolution of ashes after fire – a case study of a burnt grassland in Lithuania

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