Capable of retaining rainwater, Organic Ground Cover (OGC) is an ecological material for urban greening. The water absorption features of various OGC materials should be identified before selecting the proper OGC for places under different climates. With the aid of a rainfall simulator, this paper experimentally explores the water absorption features of 16 common OGC materials at the rainfall intensity of 48 mm/h. Based on the experimental results, the change trends of multiple indices were analyzed for these materials, namely, volumetric water absorption ratio, volumetric water absorption rate, mass water absorption ratio, mass water absorption rate, pre-drainage duration, and near saturation duration. The results show that the OGC materials differed significantly in water absorption capacity: (1) SD and PPB2 had the best volumetric water absorption ratios, while EC had the worst volumetric water absorption ratio. (2) The volumetric water absorption rates of all materials reached the maximum in 0–10 min after the artificial rainfall, and then decreased rapidly; At 10 min, the proportion of volumetric water absorption ratios of the 16 materials averaged at 74%; The highest (94%) and lowest (36%) proportions belong to OC and SD, respectively. (3) OC had the best mass water absorption ratio, while EC had the worst mass water absorption ratio. (4) At 10 min, the proportion of mass water absorption ratio of each material was the same as that of volumetric water absorption ratio; OC, PN, CF, CFP, PPB1, WB, and ANBM had obviously higher mass water absorption rates than other materials, while PS, FPB2 and EC had relatively small mass water absorption rates. (5) The shortest and longest pre-drainage durations belong to OC (2 min) and SD (13.67 min), respectively. (6) The shortest pre-near saturation belongs to CFP, PPB1, FPB2 and EC (13.33 min), the longest pre-near saturation belongs to SD (50 min), respectively. The research results provide a reference for the selection of the OGC materials in urban greening.

能够保留雨水，有机地面覆盖物（OGC）是用于城市绿化的生态材料。在为不同气候的场所选择合适的OGC之前，应先确定各种OGC材料的吸水特性。借助降雨模拟器，本文通过实验探索了16种常见OGC材料在48 mm / h的降雨强度下的吸水特性。根据实验结果，分析了这些材料的多个指标的变化趋势，即体积吸水率，体积吸水率，质量吸水率，质量吸水率，预排水时间和接近饱和时间。结果表明，OGC材料的吸水能力差异显着：（1）SD和PPB2具有最佳的体积吸水率，而EC具有最差的体积吸水率。（2）人工降雨后，所有物质的体积吸水率在0〜10min达到最大值，然后迅速下降；在10分钟时，这16种材料的体积吸水率比例平均为74％；最高（94％）和最低（36％）的比例分别属于OC和SD。（3）OC的质量吸水率最好，而EC的质量吸水率最差。（4）在10分钟时，每种材料的质量吸水率的比例与体积吸水率的比例相同；OC，PN，CF，CFP，PPB1，WB和ANBM的质量吸水率明显高于其他材料，而PS，FPB2和EC具有相对较小的质量吸水率。（5）最短和最长的预排水时间分别为OC（2分钟）和SD（13.67分钟）。（6）近前最短饱和度分别属于CFP，PPB1，FPB2和EC（13.33分钟），最长近前饱和度属于SD（50分钟）。研究结果为城​​市绿化中OGC材料的选择提供了参考。