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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Post-fire soil erosion mitigation at the scale of swales using forest logging residues at a reduced application rate (vol 44, pg 2837, 2019)
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Post-fire soil erosion mitigation at the scale of swales using forest logging residues at a reduced application rate (vol 44, pg 2837, 2019)

机译：消防后土壤侵蚀缓解在萨尔斯的规模下，使用森林测井残留物减少申请率（Vol 44，PG 2837,2019）

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Mulching with forest residues has proved to be highly effective in reducing post-fire soil losses at the plot scale. However, its effectiveness has not been quantified at the application rates that are typically used in operational post-fire land management (2-3 Mg ha(-1) using straw), as well as at scales larger than 100 m(2). The present study compared post-fire erosion rates for six convergent hillslopes or swales of 500 to 800 m(2), three of which were left untreated while the other three were mulched immediately after the fire with shredded eucalypt bark at a rate of 2.4 Mg ha(-1). Erosion rates were monitored at irregular intervals during the first three post-fire years, whilst ground cover was assessed yearly. Selected topsoil properties (0-2 cm) such as organic matter content and aggregate stability were determined at a single occasion - two years after the wildfire, for three micro-environments separately: bare soil, and under mulch/litter and vegetation. Soil losses on the untreated swales decreased with post-fire year from 2.2 to 0.4 and 0.11 Mg ha(-1) yr(-1) (respectively for the first, second and third post-fire years), while the mulched swales produced 84%, 77% and 38% less soil losses than the untreated swales. Soil losses also depended on slope aspect, with the north-facing swales producing less erosion than the west-facing ones. This could be linked to their significant differences in bare soil, vegetation and stone cover, or a combination thereof. The type of micro-environment also played a significant role in topsoil properties (stone content, bulk density, resistance to penetration/shear stress, porosity and organic matter content). The present results add to the increasing evidence that forest residues should be duly considered for operational post-fire land management. Forest residues were highly effective in reducing erosion from swales at application rates as low as the typical 2 Mg ha(-1) of post-fire straw mulch. (c) 2019 John Wiley & Sons, Ltd.
机译：已证明与森林残留物的覆盖率在减少绘图规模下减少火灾后土壤损失方面得到了高效。然而，它的有效性尚未以经营后防火陆地管理（2-3mg HA（-1）使用吸管）以及大于100米（2）的尺度的施用率。本研究比较了六个会聚山坡或500至800米（2）的洼地的火灾后侵蚀率，其中三个被留下了未经处理的，而另外三个以2.4毫克的速率碎裂在火灾中立即覆盖。哈（-1）。在火灾后三年后的不规则间隔内监测侵蚀利率，而在每年进行地面封面。选定的表土性质（0-2cm）如有机物质含量和聚集稳定性，在野火后两年内测定三次微环境：裸土，以及覆盖物/垃圾和植被下。未处理的撒播物的土壤损失随火上的每年从2.2到0.4和0.11mg ha（-1）（-1）（分别为第一，第二和第三年），而覆盖的洼地生产84比未处理的洼地减少77％和38％。土壤损失也取决于斜坡方面，面向朝北的洼地生产比西边的侵蚀更少。这可以与裸露土壤，植被和石头覆盖物的显着差异或其组合相关联。微环境的类型在表土性（石含量，堆积密度，抗渗透/剪切应力，孔隙和有机物质含量）中也发挥了重要作用。目前的结果增加了越来越多的证据，即森林残留物应适当考虑用于运营后土地管理。森林残留物非常有效地减少施用率的腐蚀，如典型的2mg橡胶夹层的典型2 mg ha（-1）。 （c）2019 John Wiley＆Sons，Ltd。

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