Analysis of coastal storm damage resistance in successional mangrove species
Analysis of coastal storm damage resistance in successional mangrove species
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DOI：
10.1002/lno.11875
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发表时间：
2021-06
影响因子：
4.5
通讯作者：
Rosanna Hespen;Zhan Hu;Yisheng Peng;B. Borsje;M. Kleinhans;T. Ysebaert;T. Bouma
中科院分区：
文献类型：
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作者：
Rosanna Hespen;Zhan Hu;Yisheng Peng;B. Borsje;M. Kleinhans;T. Ysebaert;T. Bouma
利用红树林生态系统进行沿海防洪需要对红树林波浪衰减进行可靠的预测，特别是如果这种能力由于风暴引起的森林破坏而减弱。量化和了解红树林植被阻力和力学特性的变化，可以提高红树林保护能力的评价。本文研究了中国南方亚热带珠江三角洲常见的5种红树林。研究的物种范围从典型的陆生物种到更多的海生先驱物种。我们在三角洲的七个地点取样，研究盐度对机械性能的影响。我们量化了树枝的强度和柔韧性（与树枝直径、断裂模量和弹性模量相关的树枝强度和柔韧性）、叶片强度（与叶片大小和每面积叶片质量相关的叶片附着强度）和阻力性能（与表面积和阻力系数相关的阻力）。在所有被试树种中，树枝直径越大，机械强度越高。叶片尺寸越大，峰值拉力越大，树枝表面积越大，阻力越大。值得注意的是，通常生长在潮间带较低位置的物种，在那里风和浪的暴露程度较高，它们的树枝相对较强，但叶子更容易拆卸。这可以看作是一种避免伤害的策略。在7个实地站点中，我们没有发现盐度对红树林机械特性的明显影响。该研究为单个红树林的风暴破坏过程提供了机制见解，并为在森林尺度上模拟风暴（风暴潮）损害奠定了坚实的基础。
Use of mangrove ecosystems for coastal flood protection requires reliable predictions of mangrove wave attenuation, especially if this capacity lessens due to storm‐induced forest damage. Quantifying and understanding the variation in drag forces and mechanical properties of mangrove vegetation can improve assessment of mangrove protective capacity. We studied five mangrove species common in the subtropical Pearl River Delta, south China. The studied species range from typically landward‐occurring to more seaward‐occurring pioneer species. We sampled across seven sites in the delta to study the impact of salinity on mechanical properties. We quantified strength and flexibility of branches (branch strength and flexibility related to branch diameter, modulus of rupture and modulus of elasticity), leaf strength (leaf attachment strength related to leaf size, and leaf mass per area) and drag properties (drag force related to surface area and drag coefficient). For all tested species, larger branch diameters resulted in higher mechanical strength. Larger leaf size resulted in larger peak pulling forces and larger branch surface area resulted in stronger drag forces. Notably, species that generally occur lower in the intertidal zone, where exposure to wind and waves is higher, had relatively stronger branches but more easily detachable leaves. This may be regarded as a damage‐avoiding strategy. Across the seven field sites, we found no clear effect of salinity on mangrove mechanical properties. This study provides a mechanistic insight in the storm damage process for individual mangrove trees and a solid base for modeling storm (surge) damage at the forest scale.