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风媒传播是外来杂草传播扩散的主要途径之一。我国进口粮谷中经常携带大量苋属杂草种子,这些种子质量轻,在卸货、运输等过程中存在风传播扩散风险。本文以3种重要苋属检疫性杂草,即长芒苋、西部苋和糙果苋种子为材料,通过测定其在可能撒漏高度范围和撒漏点风速范围内的垂直沉降速度和水平扩散距离,预测苋属3种检疫性杂草在装卸及运输过程中风传播扩散范围。结果表明在风速为35 m/s,种子释放高度为35 m时,长芒苋、西部苋和糙果苋3种杂草种子的最远扩散距离分别为57.75 m、111.68 m和114.33 m。
Wind transmission is one of the main ways to spread and spread weeds. China's imports of cereals often carry a large number of weed seeds of amaranth, these seeds of light weight, in the unloading, transportation and other risks of wind spread. In this paper, the three important species of quarantine amaranth, namely, Amaranthacea, Amaranthus and Amaranthus retroflexus were used as materials to measure the vertical sedimentation velocity and horizontal diffusion in the range of possible leakage rate and the leak velocity Distance, forecast three species of amaranth quarantine weeds in the process of handling and transport spread of wind spread. The results showed that the farthest diffusion distances of the three species of weed seeds were 57.75 m, 111.68 m and 114.33 m respectively when the wind speed was 35 m / s and the seed release height was 35 m.