The ineffectiveness of seeded species in reducing soil erosion losses
was very evident in the present study. Even under the rainy temperate
conditions of this site, which could have favoured rapid vegetation
growth, appreciable ground cover was not established in a reasonably
short time suggesting that fall and winter temperature could limit
vegetation growth of both native and seeded plants. This delay in
vegetation regrowth and germination is usual in this area. Anyway,
the low soil temperature during fire suggests that plant root system
was not affected and it could contribute to reduce soil losses. By
contrast, mulching was highly effective in reducing soil erosion losses,
despite the low dose of mulch added and the rainy climate, which
may have favoured loss of the mulch.
The relationship between maximumconcentrated precipitation and
soil erosion corroborated that rainfall intensity did not sufficiently explain
soil losses under the Atlantic rainfall regime pattern and suggests
overland flow generated by saturation excess rather infiltration excess.
Our study demonstrated the association between temperature during
fire and post-fire erosion, an aspect about which field evidences
are scarce. The observed relationships between erosion and exposed
soil, and between the latter and soil heating during fire, provide strong
support for the relationship between soil burn severity (expressed by
the degree of soil heating) and post-fire erosion. The findings also justify
the inclusion of bare soil as a key component of the operational fire severity
level indicators.
The ineffectiveness of seeded species in reducing soil erosion losseswas very evident in the present study. Even under the rainy temperateconditions of this site, which could have favoured rapid vegetationgrowth, appreciable ground cover was not established in a reasonablyshort time suggesting that fall and winter temperature could limitvegetation growth of both native and seeded plants. This delay invegetation regrowth and germination is usual in this area. Anyway,the low soil temperature during fire suggests that plant root systemwas not affected and it could contribute to reduce soil losses. Bycontrast, mulching was highly effective in reducing soil erosion losses,despite the low dose of mulch added and the rainy climate, whichmay have favoured loss of the mulch.The relationship between maximumconcentrated precipitation andsoil erosion corroborated that rainfall intensity did not sufficiently explainsoil losses under the Atlantic rainfall regime pattern and suggestsoverland flow generated by saturation excess rather infiltration excess.Our study demonstrated the association between temperature duringfire and post-fire erosion, an aspect about which field evidencesare scarce. The observed relationships between erosion and exposedsoil, and between the latter and soil heating during fire, provide strongsupport for the relationship between soil burn severity (expressed bythe degree of soil heating) and post-fire erosion. The findings also justifythe inclusion of bare soil as a key component of the operational fire severitylevel indicators.
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