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Effect of slopes on rainfall interception by leaf litter under simulated rainfall conditions
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-08-09 , DOI: 10.1002/hyp.14659 Longshan Zhao 1, 2 , Ping Meng 1 , Jinsong Zhang 1 , Jinxin Zhang 1 , Shoujia Sun 1 , Chunxia He 1
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-08-09 , DOI: 10.1002/hyp.14659 Longshan Zhao 1, 2 , Ping Meng 1 , Jinsong Zhang 1 , Jinxin Zhang 1 , Shoujia Sun 1 , Chunxia He 1
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Rainfall interception is one of the main hydrological functions of leaf litter. However, the effect of slope on the interception capacity of leaf litter has received little attention. The objectives of this study were to determine the capacities of leaf litters to intercept rainwater under different slopes (i.e., flat ground at 0° and inclined slopes at 5°, 15°, 25° and 35°) and to analyse the ways in which the slope affects the interception capacity of leaf litter. Under a simulated rainfall intensity of 50 mm/h, litter flows (i.e., infiltration flow, slope flow and lateral flow) through three types of leaf litter (i.e., Pinus massoniana needleleaves and Osmanthus fragrans and Magnolia grandiflora broadleaves) were measured. The leaf litter biomass per unit area was 0.5 kg/m2 in the experimental box, and the interception capacity was calculated using the difference between rainfall and litter flow. The results show that the interception capacity of broadleaves was greater than that of needleleaves. The effect of slope was more pronounced than that of leaf shape because the rainwater stored on the leaf surfaces contributed to the generation of litter flow as the slope increased. The rainfall amount intercepted by each leaf litter decreased with increasing slope, and changes in the proportion of rainfall interception by leaf litter with increasing rainfall duration can be described by an exponential function (R2 > 0.80, p < 0.001). The maximum dynamic interception capacity (Cmax) and effective interception capacity (Cmin) of the three leaf litter types decreased as the slope increased. Statistical analyses show that 15° is a critical slope threshold that influences rainfall interception by leaf litter and litter flow. When the slope was greater than 15°, leaf litter interception capacities significantly decreased and the level of litter flow significantly increased. Therefore, slope affects the interception capacity of leaf litter and this impact should be considered in the estimation of litter interception storage on an inclined slope.
中文翻译：
模拟降雨条件下坡度对落叶层截雨的影响
截雨是落叶层的主要水文功能之一。然而，坡度对凋落物截留能力的影响却很少受到关注。本研究的目的是确定落叶层在不同坡度（即 0° 平坦地面和 5°、15°、25° 和 35° 坡度）下截留雨水的能力，并分析落叶层拦截雨水的方式。坡度影响落叶拦截能力。在50 mm/h的模拟降雨强度下，凋落物流经三种落叶（即马尾松针叶桂花和广玉兰）阔叶）进行了测量。实验箱内单位面积落叶生物量为0.5 kg/m 2，截留能力采用降雨量与凋落物流量之差计算。结果表明，阔叶树的截留能力大于针叶树。坡度的影响比叶形的影响更明显，因为随着坡度的增加，储存在叶片表面的雨水有助于产生枯枝落叶流。各凋落物截获的降雨量随着坡度的增加而减少，而凋落物截获降雨的比例随降雨持续时间的增加而变化可以用指数函数来描述（R 2 > 0.80, p < 0.001)。三种凋落物的最大动态截留能力（C max）和有效截留能力（C min）随着坡度的增加而降低。统计分析表明，15°是影响落叶和凋落物流量截留降雨的临界坡度阈值。当坡度大于15°时，落叶拦截能力显着降低，凋落物流量水平显着增加。因此，坡度影响落叶的截留能力，在估算斜坡上的凋落物截留量时应考虑这种影响。
更新日期：2022-08-09
中文翻译：
模拟降雨条件下坡度对落叶层截雨的影响
截雨是落叶层的主要水文功能之一。然而，坡度对凋落物截留能力的影响却很少受到关注。本研究的目的是确定落叶层在不同坡度（即 0° 平坦地面和 5°、15°、25° 和 35° 坡度）下截留雨水的能力，并分析落叶层拦截雨水的方式。坡度影响落叶拦截能力。在50 mm/h的模拟降雨强度下，凋落物流经三种落叶（即马尾松针叶桂花和广玉兰）阔叶）进行了测量。实验箱内单位面积落叶生物量为0.5 kg/m 2，截留能力采用降雨量与凋落物流量之差计算。结果表明，阔叶树的截留能力大于针叶树。坡度的影响比叶形的影响更明显，因为随着坡度的增加，储存在叶片表面的雨水有助于产生枯枝落叶流。各凋落物截获的降雨量随着坡度的增加而减少，而凋落物截获降雨的比例随降雨持续时间的增加而变化可以用指数函数来描述（R 2 > 0.80, p < 0.001)。三种凋落物的最大动态截留能力（C max）和有效截留能力（C min）随着坡度的增加而降低。统计分析表明，15°是影响落叶和凋落物流量截留降雨的临界坡度阈值。当坡度大于15°时，落叶拦截能力显着降低，凋落物流量水平显着增加。因此，坡度影响落叶的截留能力，在估算斜坡上的凋落物截留量时应考虑这种影响。
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