Relationship between seed morphological traits and wind dispersal trajectory.
Relationship between seed morphological traits and wind dispersal trajectory.
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DOI：
10.1071/fp19087
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Quanlai Zhou;Zhimin Liu;Zhiming Xin;S. Daryanto;Lixin Wang;J. Qian;Yongcui Wang;Wei Liang;Xuanping Qin;Yingming Zhao;Xinle Li;Xue Cui;Minghu Liu
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文献类型：
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作者：
Quanlai Zhou;Zhimin Liu;Zhiming Xin;S. Daryanto;Lixin Wang;J. Qian;Yongcui Wang;Wei Liang;Xuanping Qin;Yingming Zhao;Xinle Li;Xue Cui;Minghu Liu
植物种群和群落的结构和动态在很大程度上受到种子传播的影响。种子的风传播轨迹如何随着种子形态的差异而变化仍然是未知的。利用风洞和摄像机对沙拐枣属7种具有不同附属物和其他形态特征的种子进行了扩散轨迹跟踪研究，利用不同的风速和释放高度确定了沙拐枣种子形态特征与风扩散轨迹之间的关系。发现了凹形、直线形、水平抛射形和抛射形等抛撒轨迹，水平抛射体（HP）和抛射体（P）等抛撒轨迹的抛撒距离较长。直线（SL）和凹曲线（CC）的轨迹往往有一个短的扩散距离。具有刚毛和大质量的种子倾向于SL和CC轨迹，具有翅膀或气球和小质量的种子倾向于HP和P轨迹。风速对轻、低翼载种子的扩散轨迹影响较大，释放高度对重、高翼载种子的扩散轨迹影响较大。因此，种子风扩散轨迹不仅取决于种子的形态特征，还取决于风速、释放高度等环境因素。
The structure and dynamics of plant populations and communities are largely influenced by seed dispersal. How the wind dispersal trajectory of seeds shifts with differences in seed morphology remains unknown. We used a wind tunnel and video camera to track the dispersal trajectory of seven species of Calligonum whose seeds have different kinds of appendages and other morphological traits, using variable wind speeds and release heights to determine the relationship between seed morphological traits and wind dispersal trajectory. Concave-, straight-line-, horizontal-projectile- and projectile-shaped trajectories were found. Dispersal trajectories such as the horizontal projectile (HP) and projectile (P) tended to have a long dispersal distance. Straight line (SL) and concave curve (CC) trajectories tended to have a short dispersal distance. Seeds with bristles and large mass tended to have SL and CC trajectories, those with wings or balloon and small mass tended to have HP and P trajectories. Wind speed tended to have a stronger influence on the dispersal trajectory of light and low-wing-loading seeds, and release height tended to have a stronger influence on the dispersal trajectory of heavy and high-wing-loading seeds. Thus, seed wind dispersal trajectory is not only determined by seed morphological characteristics but also by environmental factors such as wind speed and release height.