Costs and benefits of non-random seed release for long distance dispersal in wind-dispersed plant species

The dispersal ability of plants is a major factor driving ecological responses to global change. In wind-dispersed plant species, non-random seed release in relation to wind speeds has been identified as a major determinant of dispersal distances. However, little information is available about the costs and benefits of non-random abscission and the consequences of timing for dispersal distances.
We asked: 1) To what extent is non-random abscission able to promote long-distance dispersal and what is the effect of potentially increased pre-dispersal risk costs? 2) Which meteorological factors and respective timescales are important for maximizing dispersal? These questions were addressed by combining a mechanistic modelling approach and field data collection for herbaceous wind-dispersed species.
Model optimization with a dynamic dispersal approach using measured hourly wind speed showed that plants can increase long-distance dispersal by developing a hard wind speed threshold below whi...

植物的扩散能力（dispersal ability）是驱动生态系统响应全球变化的关键因子。对于风播植物物种（wind-dispersed plant species）而言，与风速相关的非随机种子释放已被确定为影响其扩散距离的核心决定因素。然而，目前关于非随机脱落的成本与收益，以及脱落时机对扩散距离的影响，相关研究资料仍较为匮乏。
本研究提出以下两个科学问题：1）非随机脱落可在多大程度上促进长距离扩散？预扩散风险成本的潜在提升会带来何种影响？2）哪些气象因子及对应时间尺度对最大化扩散效率至关重要？
为解答上述问题，本研究结合机理建模方法（mechanistic modelling approach）与草本风播植物物种的野外数据采集工作展开研究。
采用逐小时实测风速构建的动态扩散方法（dynamic dispersal approach）开展的模型优化结果表明，植物可通过设定硬风速阈值（hard wind speed threshold）提升长距离扩散能力，该阈值低于……