DOI: 10.1016/j.foreco.2017.04.019
Scopus记录号: 2-s2.0-85018629252
论文题名: Runoff and soil erosion mitigation with sieved forest residue mulch strips under controlled laboratory conditions
作者: Prats S.A. ; Abrantes J.R. ; Crema I.P. ; Keizer J.J. ; de Lima J.L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 396 起始页码: 102
结束页码: 112
语种: 英语
英文关键词: Connectivity
; Forest residue
; Mulch strips
; Rill erosion
; Soil erosion mitigation
Scopus关键词: Forestry
; Rain
; Runoff
; Soils
; Connectivity
; Forest residue
; Mulch strips
; Rill erosion
; Soil erosion
; Erosion
英文摘要: Post-fire forest residue mulching using eucalypt bark strands have been proven effective for reducing hillslope runoff and erosion in field plots of different sizes (0.25–100 m2). Application rates of around 8–10 Mg ha−1 achieved about 80% protective soil surface. Lower application rates, however, would reduce costs and, possibly, allow faster application, which could be especially critical in late summer high-severity fires. Such lower rates could be achieved by applying less mulch per unit area, by applying mulch in specific zones (strips) and by removing the finest fractions, especially since these can be expected to contribute little to reduce erosion risk. The objective of this laboratory study was to identify the threshold, or the minimum application rate, at which a new mulch blend (without the fraction ≤4 cm) would effectively control runoff and erosion. Two levels of ground cover by forest residue mulch (50 and 70%) and three mulch strips (covering the lower 1/3, 2/3 and 3/3 of a flume) were tested against the untreated bare soil by applying simulated rainfall and simulated inflow. The seven treatments were replicated three times using a 2.7 m × 0.3 m flume with a 40% slope, filled with a dry loamy sand soil. Each experiment included: (i) a “Dry” soil run comprising 20 min of simulated rainfall at a rate of 56 mm h−1; (ii) a “Wet” soil run with the same rainfall characteristics; (iii) a “Flow” run combining 20 min of rainfall with three inflows at increasing rates (52, 110, 232 mm h−1) on nearly saturated soil. The results showed that overall runoff, interrill and rill erosion were strongly reduced and leaching was increased by covering the flume with 2 m and 3 m mulch strips at 70% ground cover (overall mulch application rates of 2.6 and 1.3 Mg ha−1). The 1 m mulch strips at 70% mulch cover (1 Mg ha−1) also reduced significantly erosion but not runoff. The three mulch strips at 50% ground cover were less effective, and only the application over the whole plot was able to reduce interrill and rill erosion. Apparently, runoff depended most on mulch cover, while soil losses depended most on strip width. Even so, the new mulch blend was poorly effective in reducing runoff but effective in reducing interrill erosion and even highly effective in reducing rill erosion. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64336
Appears in Collections: 影响、适应和脆弱性
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作者单位: Centre for Environmental and Maritime Studies (CESAM), Department of Environment and Planning, University of Aveiro, Campus Universitário de Santiago, Aveiro, Portugal; Marine and Environmental Sciences Centre (MARE), Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra, Rua Luís Reis Santos – Pólo II Univ. Coimbra, Coimbra, Portugal
Recommended Citation:
Prats S.A.,Abrantes J.R.,Crema I.P.,et al. Runoff and soil erosion mitigation with sieved forest residue mulch strips under controlled laboratory conditions[J]. Forest Ecology and Management,2017-01-01,396