Rainfall interception loss by pebble mulch in the semiarid region of China
Rainfall interception loss by pebble mulch in the semiarid region of China
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DOI：
10.1016/s0022-1694(00)00152-9
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发表时间：
2000-03-13
影响因子：
6.4
通讯作者：
Wei, XH
中科院分区：
文献类型：
--
作者：
Li, XY;Gong, JD;Wei, XH
在中国半干旱地区，卵石覆盖用于保持土壤水分已有300多年的历史。然而，很少有工作已经进行了卵石覆盖层的降雨截留损失。通过野外试验，研究了卵石覆盖物在不同降雨过程中的截留损失，确定了卵石覆盖物的蓄水能力，并讨论了截留量与降雨参数之间的关系。研究表明，卵石粒径对截留损失有影响。一个5 cm厚的卵石覆盖层，卵石长径为7.5-14.0 cm，短径为5.0-9.0 cm（较大卵石），饱和值为0.281 mm，平均截留量为0.481 mm，在单次降雨过程中平均截留率为11.5%。相比之下，一个类似的层，卵石长尺寸为2.0-6.5厘米，短尺寸为2.0-6.0厘米（较小的卵石），饱和值为0.526毫米，平均截留量为0.742毫米，或17.4%的总降雨量每次风暴。卵石覆盖的截留量与总降雨量的相关性较差。卵石覆盖对总降雨量的截留比例随总降雨量的增加而减小。降雨量超过10 mm时，降雨量的减少百分比非常显著。截留量随降雨强度的增加呈下降趋势（I-30）。在6 mm h（-1）以下的强度下，拦截量有很大的变化。当强度超过6 mm h（-1）时，拦截量趋于保持恒定，大卵石约为0.25 mm，小卵石约为0.40 mm。降雨前卵石含水量对截留损失影响显著，约50%的截留发生在降雨初期。因此，在未来的拦截分析中也应考虑降雨持续时间和风因素。(C)2000 Elsevier Science B. V.保留所有权利。
Pebble mulches have been used to conserve soil moisture in the semiarid regions of China for over 300 years. However, little work has been carried out on rainfall interception loss by a pebble mulch layer. A field study was conducted to measure interception loss by pebble mulches during individual rainfall events, determine the rainfall-storage capacity of pebble mulch, and discuss the relationships between interception and rainfall parameters. The study showed that pebble size could affect interception loss. A 5 cm-thick pebble mulch layer, with pebbles 7.5-14.0 cm in the long dimension and 5.0-9.0 cm in the short dimension (larger pebble), had a saturation value of 0.281 mm, an average interception of 0.481 mm. and an average percentage interception of 11.5% during individual rainfall events. In contrast, a similar layer, with pebbles 2.0-6.5 cm in the long dimension and 2.0-6.0 cm in the short dimension (smaller pebble), had a saturation value of 0.526 mm, and an average interception of 0.742 mm, or 17.4% gross rainfall per storm. The correlation between interception by pebble mulch and gross rainfall was poor. The proportion of gross rainfall intercepted by pebble mulch tended to decrease as gross rainfall increased. The reduction in percentage was very marked for rains over 10 mm. Interception showed a tendency to decline with increasing rain intensity (I-30). There was a broad variability in interception for intensities under 6 mm h(-1). Interception tended to remain constant at about 0.25 mm for larger pebble and 0.40 mm for smaller pebble when intensity was over 6 mm h(-1). Antecedent water content of pebble before a storm significantly affected interception loss, with about 50% interception occurring in the initial stage of a rainfall event. Rainfall duration and wind factors should, therefore, also be considered in future interception analysis. (C) 2000 Elsevier Science B.V. All rights reserved.