School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China.
Division of Water Resources Engineering, Lund University, Box 118, 221 00, Lund, SE, Sweden.
Sci Rep. 2021 Mar 18;11(1):6259. doi: 10.1038/s41598-021-85343-x.
The use of organic mulch is important for urban green applications. For urban areas in arid and semiarid regions receiving short high-intensive rainfall, rainfall characteristics, and soil slope play an important role for mulch functioning. These properties of mulch were studied. For this purpose, rainfall simulation experiments using organic mulching were conducted in Jiufeng National Forestry Park to analyze the influence of organic mulch under different slope and heavy rainfall events. The results showed that soil water content displayed a decreasing tendency with increasing mulch application. Compared to bare soil, a mulch application of 0.25 kg/m and 0.50 kg/m led to maximum soil water content and maximum runoff decrease occurred for 0.50 kg/m mulch. Higher application rate of mulch displayed less soil water content and greater runoff. The runoff amount and runoff generation rate decreased by 28-83% and 21-83%, respectively, as compared to bare soil. With a mulch application of 0.25-1.00 kg/m, soil drainage accounted for 56-60% of total rainfall. Overall, an efficient mulch application was found to be 0.25-0.50 kg/m. The results of this study are relevant for arid and semiarid urban regions that experience heavy rainfall.
有机覆盖物的使用对城市绿化应用很重要。对于干旱和半干旱地区接收短而高强度降雨的城市地区，降雨特征和土壤坡度对覆盖物的功能起着重要作用。研究了这些覆盖物的特性。为此，在鹫峰国家森林公园进行了有机覆盖物的降雨模拟实验，以分析不同坡度和强降雨事件下有机覆盖物的影响。结果表明，随着覆盖物用量的增加，土壤含水量呈下降趋势。与裸土相比，0.25kg/m 和 0.50kg/m 的覆盖物应用导致最大土壤含水量和最大径流量出现在 0.50kg/m 的覆盖物上。较高的覆盖物用量表现出较少的土壤含水量和更大的径流量。与裸土相比，径流量和产流率分别减少了 28-83%和 21-83%。对于 0.25-1.00kg/m 的覆盖物应用，土壤排水占总降雨量的 56-60%。总的来说，发现有效的覆盖物应用量为 0.25-0.50kg/m。本研究结果适用于经历强降雨的干旱和半干旱城市地区。
