A new model for root growth in soil with macropores
A new model for root growth in soil with macropores
复制标题
DOI：
10.1007/s11104-016-3144-2
复制
发表时间：
2017-06-01
期刊：
影响因子：
4.9
通讯作者：
Vereecken, Harry
中科院分区：
文献类型：
--
作者：
Landl, Magdalena;Huber, Katrin;Vereecken, Harry
使用标准的动态根构型模型来模拟含有大孔隙的土壤中的根系生长，不能再现实验观察到的根系生长模式。因此，我们开发了一种新的、更机械的模型方法来模拟结构性土壤中的根生长。在我们的另一种建模方法中，我们首先区分了根生长的驱动力，它由前一根段的方向和重力性的影响决定，其次是土壤对根生长的机械阻力。后者用它的逆--土壤机械传导性表示，与达西定律中的水力传导性相似。在存在大孔隙的情况下，土壤机械电导是各向异性的，这导致驱动力的方向和根尖运动的方向不同。利用文献中的数据在盆栽尺度、大孔隙尺度上进行了检验，并在一系列模拟中评估了对重力和大孔隙取向的敏感性。模拟的根系与实验观测的根系进行了定性和定量的比较，表明土壤水分流动与根系生长之间的类比是有用的。
The use of standard dynamic root architecture models to simulate root growth in soil containing macropores failed to reproduce experimentally observed root growth patterns. We thus developed a new, more mechanistic model approach for the simulation of root growth in structured soil.In our alternative modelling approach, we distinguish between, firstly, the driving force for root growth, which is determined by the orientation of the previous root segment and the influence of gravitropism and, secondly, soil mechanical resistance to root growth. The latter is expressed by its inverse, soil mechanical conductance, and treated similarly to hydraulic conductivity in Darcy's law. At the presence of macropores, soil mechanical conductance is anisotropic, which leads to a difference between the direction of the driving force and the direction of the root tip movement.The model was tested using data from the literature, at pot scale, at macropore scale, and in a series of simulations where sensitivity to gravity and macropore orientation was evaluated.Qualitative and quantitative comparisons between simulated and experimentally observed root systems showed good agreement, suggesting that the drawn analogy between soil water flow and root growth is a useful one.