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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Seagrass leaves in 3-D: Using computed tomography and low-frequency acoustics to investigate the material properties of seagrass tissue
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Seagrass leaves in 3-D: Using computed tomography and low-frequency acoustics to investigate the material properties of seagrass tissue

机译：3-D海草叶：使用计算机断层扫描和低频声学技术研究海草组织的材料特性

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摘要

As a preliminary step toward development of a predictive model of sound speed in water containing seagrass, the acoustic and material properties of leaf tissue for Thalassia testudinutn, Syringodiumfiliforme and Halodule wriglitii were assessed using a one-dimensional acoustic resonator and computed tomography imagery. The high-resolution three-dimensional imagery provided valuable information about leaf morphology and produced precise estimates for plant tissue volume and the volume of air contained within the aerenchyma of the plant tissue, which in turn yielded measurements of the plant tissue density (Thalassia = 1032.34± 115.42 kg·m~3; Syringodium = 664.17±10.38 kg·m~(-3); Halodule = 964.96±21.72 kg·m~(-3). The acoustic resonator technique was used to investigate the species-specific and biomass-dependent differences in the propagation of sound through seawater containing seagrass leaves in the 0.2 kHz to 10 kHz frequency band. The three species each caused a unique decrease in sound speed with an increase in biomass. The values for leaf air volume, tissue volume and tissue density were then combined with the results of the acoustic experiments and an effective medium acoustic model to determine the acoustic compressibility of the leaves. Further implementation of two effective medium models failed to yield measurements of leaf tissue compressibility. Failure of these models indicates that tissue elasticity and structure must be considered for a complete understanding of acoustic propagation in seagrass meadows.
机译：作为开发含海草水中声速预测模型的第一步，使用一维声学共振器和计算机断层扫描图像评估了地中海藻，拟南芥和线虫的叶片组织的声学和材料特性。高分辨率的三维图像提供了有关叶片形态的有价值的信息，并精确估计了植物组织的体积和植物组织的气孔中所含的空气量，进而得出了植物组织密度的测量值（Th色= 1032.34 ±115.42 kg·m〜3;延髓鞘= 664.17±10.38 kg·m〜（-3）;卤代烷= 964.96±21.72 kg·m〜（-3）。利用声共振技术研究了物种特异性和生物量在0.2 kHz至10 kHz频带内，含海草叶的海水中声音的传播差异具有相关性；这三个物种分别导致音速随生物量的增加而独特地降低。叶片空气量，组织体积和然后将组织密度与声学实验结果和有效的介质声学模型相结合，以确定叶片的声学可压缩性，进一步实现两个有效的介质模型fai导致了对叶片组织可压缩性的测量。这些模型的失败表明必须完全考虑组织的弹性和结构，才能完全理解海草草甸中的声传播。

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