Experimental Investigation of Plant Root Growth Through Granular Substrates
Experimental Investigation of Plant Root Growth Through Granular Substrates
复制标题
颗粒基质中植物根系生长的实验研究
DOI：
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发表时间：
2011
影响因子：
2.4
通讯作者：
Anette Hosoi
中科院分区：
文献类型：
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作者：
D. Wendell;K. Luginbuhl;J. Guerrero;Anette Hosoi
众所周知，颗粒材料是不均匀的，即颗粒之间的力是局部化的力链。然而，以前的植物根系生长的工作忽略了这种变异性，在粒状土壤和报告散装特性或使用均匀的介质，如琼脂，生长植物根系。在本文中，我们报告的结果平托豆根生长通过颗粒系统，光弹性颗粒被用来可视化和量化的系统中的局部力量。讨论了两个问题：植物根系如何对颗粒之间不同水平的力作出反应，以及生长的根系如何改变颗粒系统中的力分布。我们发现，平托豆的根是不太可能生长在晶粒之间的这些晶粒之间的力的增加，根可以施加，平均110毫牛的力的颗粒系统。然而，这两个观察结果都是时间依赖性的。随着根的生长，晶粒间的力和根赋予系统的力都随着时间的推移而增加，而根横截面中没有可观察到的伴随几何变化。
It is well known that granular materials are not homogeneous, i.e. the forces between grains are localized in force chains. However, previous work on plant root growth has neglected this variability in granular soils and reported bulk characteristics or used homogeneous media, such as agar, to grow plant roots. In this paper we report the results of pinto bean root growth through a granular system where photoelastic grains are used to visualize and quantify the local forces in the system. Two issues are addressed: how plant roots respond to different levels of force between grains, and how the growing roots alter the force distribution in a granular system. We find that pinto bean roots are less likely to grow between grains as the force between those grains increases and that roots can exert, on average, 110 mN of force on the granular system. However, both of these observations are time-dependent. Both the inter-grain forces as the roots grow and the forces that the roots impart to the system increase in time without observable concomitant geometric changes in root cross-section.