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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Finessing the fracture energy barrier in ballistic seed dispersal
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Finessing the fracture energy barrier in ballistic seed dispersal

机译:破坏弹道种子扩散中的断裂能垒

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Fracture is a highly dissipative process in which much of the stored elastic energy is consumed in the creation of new surfaces. Surprisingly, many plants use fracture to launch their seeds despite its seemingly prohibitive energy cost. Here we use Impatiens glandulifera as model case to study the impact of fracture on a plant's throwing capacity. /. glandulifera launches its seeds with speeds up to 4 m/s using cracks to trigger an explosive release of stored elastic energy. We find that the seed pod is optimally designed to minimize the cost of fracture. These characteristics may account for its success at invading Europe and North America.
机译:断裂是高度耗散的过程,其中在创建新表面时会消耗大量存储的弹性能。出人意料的是,尽管能源成本高得惊人,但许多植物还是用骨折来发芽。在这里,我们以凤仙花(Impatiens glandulifera)为例,研究断裂对植物抛掷能力的影响。 /。腺体通过裂隙以高达4 m / s的速度发射种子,从而触发爆炸性释放所存储的弹性能。我们发现,种子荚的设计经过了优化,可以最大程度地降低破裂成本。这些特征可能是其成功入侵欧洲和北美的原因。

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