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首页> 外文期刊>International Journal of Wildland Fire >Soil heating during burning of forest slash piles and wood piles
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Soil heating during burning of forest slash piles and wood piles

机译：森林砍伐桩和木桩燃烧过程中的土壤加热

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摘要

Pile burning of conifer slash is a common fuel reduction practice in forests of the western United States that has a direct, yet poorly quantified effect on soil heating. To address this knowledge gap, we measured the heat pulse beneath hand-built piles ranging widely in fuel composition and pile size in sandy-textured soils of the Lake Tahoe Basin. The soil heat pulse depended primarily on fuel composition, not on pile size. Burn piles dominated by large wood produced extreme temperatures in soil profile, with lethal heating lasting up to 3 days. In contrast, the heat pulse was moderate beneath piles containing a mixture of fuel sizes. Considerable spatial variability was noted, as soil temperatures were generally greatest near pile centres and decline sharply toward the pile edges. Also, saturating pile burns with water 8h after ignition (mopping up) effectively quenched the soil heat pulse while allowing near-complete fuel consumption. The findings suggest that burning of hand piles will not result in extreme or extensive soil heating except for uncommon conditions when piles are dominated by large wood and occupy a high percentage of the ground surface.
机译：在美国西部的森林中，针叶林斜线的堆烧是一种常见的减少燃料的做法，对土壤加热有直接但量化效果不佳。为了解决这一知识鸿沟，我们测量了太浩湖盆地沙质土壤中人工桩下的热脉冲，这些桩的燃料成分和桩大小差异很大。土壤热脉冲主要取决于燃料成分，而不取决于堆的大小。以大木材为主的燃烧堆在土壤剖面中产生了极高的温度，致死性加热可持续长达3天。相反，在包含多种燃料大小的堆下，热脉冲中等。注意到有很大的空间变异性，因为土壤温度通常在桩心附近最高，并朝桩边急剧下降。同样，在点火（扫除）后8小时，饱和的堆肥用水烧掉，有效地淬灭了土壤热脉冲，同时使燃料消耗几乎完全。研究结果表明，燃烧燃烧的手堆不会导致极端或广泛的土壤加热，除非在少数情况下，当堆堆以大块木材为主且占地面的比例很高时。

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