Capturing 3D Water Flow in Rooted Soil by Ultra-fast Neutron Tomography.
Capturing 3D Water Flow in Rooted Soil by Ultra-fast Neutron Tomography.
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DOI：
10.1038/s41598-017-06046-w
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发表时间：
2017-07-21
影响因子：
4.6
通讯作者：
Oswald SE
中科院分区：
文献类型：
--
作者：
Tötzke C;Kardjilov N;Manke I;Oswald SE
土壤水分入渗不仅受土壤本身的非均质性影响，更受植物根系及其吸水性的相互作用影响。中子层析成像是一种独特的非侵入性三维工具，可以可视化植物根系和土壤水分分布。到目前为止，以小时为单位的采集时间一直是三维水动力学成像的主要限制因素。通过实现另一种采集程序，我们提高了在10秒内捕获整个层析图的采集速度。这使得我们第一次可以在时间分辨率为3D的情况下，跟踪在氘化水渗透时在根状土柱中上升的水锋。图像质量和分辨率可以维持在一个允许以高细节捕捉根系的水平。良好的信噪比和对比度是可视化水分动态变化和定位根系吸收的关键。我们展示了超快速断层扫描定量成像根际含水量快速变化的能力，并概述了这种成像数据在三维吸水模型中的价值。所提出的方法为多孔系统中各种三维流动和输运现象的时间分辨研究铺平了道路。
Water infiltration in soil is not only affected by the inherent heterogeneities of soil, but even more by the interaction with plant roots and their water uptake. Neutron tomography is a unique non-invasive 3D tool to visualize plant root systems together with the soil water distribution in situ. So far, acquisition times in the range of hours have been the major limitation for imaging 3D water dynamics. Implementing an alternative acquisition procedure we boosted the speed of acquisition capturing an entire tomogram within 10 s. This allows, for the first time, tracking of a water front ascending in a rooted soil column upon infiltration of deuterated water time-resolved in 3D. Image quality and resolution could be sustained to a level allowing for capturing the root system in high detail. Good signal-to-noise ratio and contrast were the key to visualize dynamic changes in water content and to localize the root uptake. We demonstrated the ability of ultra-fast tomography to quantitatively image quick changes of water content in the rhizosphere and outlined the value of such imaging data for 3D water uptake modelling. The presented method paves the way for time-resolved studies of various 3D flow and transport phenomena in porous systems.
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DOI：
10.1073/pnas.1221373110
发表时间：
2013-03-05
影响因子：
11.1
作者：
Berg, Steffen;Ott, Holger;Stampanoni, Marco
通讯作者：
Stampanoni, Marco
影响因子：
6.4
作者：
Wildenschild, D;Hopmans, JW;Christensen, BSB
通讯作者：
Christensen, BSB
影响因子：
7.3
作者：
Pages, Loic
通讯作者：
Pages, Loic
影响因子：
2.8
作者：
Oswald, Sascha E.;Menon, Manoj;Schulin, Rainer
通讯作者：
Schulin, Rainer
影响因子：
6.1
作者：
Kardjilov, Nikolay;Hilger, Andre;Banhart, John
通讯作者：
Banhart, John