A multi image-based approach for modelling plant-fertiliser interaction
A multi image-based approach for modelling plant-fertiliser interaction
复制标题
DOI：
10.1016/j.rhisph.2019.100152
复制
发表时间：
2019-06-01
期刊：
影响因子：
3.7
通讯作者：
Roose, Tiina
中科院分区：
文献类型：
--
作者：
Fletcher, Daniel M. McKay;Keyes, Samuel D.;Roose, Tiina
磷肥对作物产量至关重要。然而，传统的磷酸盐资源正在减少，因此需要更有效地使用磷肥来实现可持续农业。本研究通过评估动态根系结构如何改善肥料颗粒的磷根吸收，展示了元素图参数化的基于图像的模型的范围。提出了一种基于多图像的建模方法，该方法利用结构成像与元素图相结合。结构成像用于捕获大麦（Hordeum vulgare L.）CV.光学）根，土壤和肥料颗粒配置作为一个域的数值模拟。元素图谱被用来图像磷在土壤薄片相同的样品。这两种成像模式对齐使用自动化的方法和基于图像的模型描述的扩散和根吸收的磷在土壤中的参数化使用的元素地图。结构成像显示，根长密度增加内部和附近的肥料颗粒。平均元素数据揭示了颗粒的磷梯度。模拟结果表明：在30天内，颗粒仅增强了2 mm内的根的磷吸收，密集的根降低了磷吸收效率，并且对来自肥料的营养物有反应的根系在颗粒附近具有相对增加的磷吸收效率。结构和元素成像的组合提供了一种手段，以准确地参数化描述根-土壤肥料系统中磷运动的模型的几何和化学方面。这种方法可能适用于其他植物土壤系统的结构和元素的数量是重要的问题。
Phosphorus fertilisation is crucial for crop yields. However, traditional phosphate resources are dwindling, thus a more efficient use of phosphorus fertilisers is required for sustainable farming. This study demonstrates the scope of image-based models parameterised by elemental maps by assessing how a dynamic root system architecture may improve phosphorus root uptake from a fertiliser pellet. A multi-image based modelling method was developed by utilising structural imaging coupled with elemental maps. Structural imaging was used to capture barley (Hordeum vulgare L. cv. Optic) root, soil and fertiliser pellet configurations as a domain for numerical simulations. Elemental mapping was used to image phosphorus in soil thin-sections of the same samples. These two imaging modes were aligned using an automated method and image-based models describing the diffusion and root-uptake of phosphorus in soil were parametrised using the elemental maps. Structural imaging showed root length density was increased inside and near the fertiliser pellet. Averaging elemental data revealed phosphorus gradients from the pellet. Modelling results suggested: the pellet only enhances phosphorus uptake of roots within 2 mm over 30 days, densely packed roots decrease phosphorus uptake efficiency, and a root system that responded to nutrients from a fertiliser have comparatively increased phosphorus uptake efficiency near the pellet. The combination of structural and elemental imaging provides the means to accurately parameterise both the geometric and chemical aspects of models describing phosphorus movement in root-soilfertiliser systems. This approach may be applicable to other plant-soil systems where structure and elemental quantities are important to the problem.