Sprinkler irrigation has dominated the irrigation erosion, and droplet diameter is an important determinant. To clarify the influence of maize canopy and sprinkler droplets landing angle on drop size distribution, distribution trend, and throughfall droplets diameters, the information on droplet size and velocity are collected via 2D-video-disdrometer. The results showed that due to the presence of maize canopy and the decrease in landing angle, the proportion of the tiny droplets (<2 mm) within throughfall increased. Throughfall droplet size distribution under maize canopy exhibited a distinct bimodal trend, however, the new droplet volume ratio is greater when the droplet size is smaller. In addition, the trend-line of throughfall droplet size distribution gradually shifted toward the origin as the landing angle decreased. Because of maize canopy and gradual decrease in the landing angle, throughfall droplets diameters decreased. When the droplets are <2 mm, their volume proportion is greater than that in the absence of maize canopy because of the fragmentation of large droplets. Affected by the convergence of small droplets on maize leaves, the diameter of drips generated from maize leaves in this study probably ranged from 2–5 mm. Drops >5.01 mm maight have originated from direct throughfall.

中文翻译：

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玉米冠层下液滴大小分布及穿透液滴组成的有效测定

喷灌主导了灌溉侵蚀，液滴直径是一个重要的决定因素。为阐明玉米冠层和洒水器液滴降落角度对液滴尺寸分布、分布趋势和通过下落液滴直径的影响，通过 2D-video-disdrometer 收集液滴尺寸和速度信息。结果表明，由于玉米冠层的存在和降落角度的减小，通过落差内微小水滴（<2 mm）的比例增加。玉米冠层下穿透液滴粒径分布呈现明显的双峰趋势，但当液滴粒径越小时，新液滴体积比越大。此外，随着降落角度的减小，贯穿落水滴粒径分布的趋势线逐渐向原点偏移。由于玉米冠层和着陆角度的逐渐减小，通过落水滴的直径减小。当液滴<2 mm时，由于大液滴的破碎，它们的体积比例大于没有玉米冠层的情况。受玉米叶片上小液滴会聚的影响，本研究中玉米叶片产生的液滴直径可能在2-5毫米之间。> 5.01 mm 的跌落可能来自直接穿过跌落。本研究中玉米叶片产生的水滴直径可能在 2-5 毫米之间。> 5.01 mm 的跌落可能来自直接穿过跌落。本研究中玉米叶片产生的水滴直径可能在 2-5 毫米之间。> 5.01 mm 的跌落可能来自直接穿过跌落。