Hydrus-1D and HYDRUS-2D - Root Growth Module
The Root Growth module was developed as a supplemental module of the HYDRUS software package (both Hydrus-1D and HYDRUS (2D/3D), to model the root growth as a function of different environmental stresses. The root growth model is based on the approach developed by Jones et al. (1991). The model assumes that various environmental factors can influence the root development under suboptimal conditions. These environmental factors are characterized by various growth stress factors. Root growth and the development of root length density then depend on environmental factors when the stress factor approach is used. This text provides a detailed description of the implemented model, as well as several test examples demonstrating various features of this model.
The names of the projects below refer to Figures in the text describing this special module (Hartmann and Simunek, 2015).
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Project
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Program
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Description
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Figure 4
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HYDRUS-1D
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Root length density (RLD) distribution under drought conditions
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Figure 5
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HYDRUS-1D
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RLD distribution under increased drought conditions
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Figure 6
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HYDRUS-1D
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RLD distribution under increased drought conditions + effects of texture and BD
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Figure 7
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HYDRUS-1D
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RLD distribution under wet conditions + effects of texture and BD
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Figure 8
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HYDRUS-1D
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RLD distribution under wet conditions + effects of texture and BD + hydrotropism
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Figure 9_10
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HYDRUS-1D
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RLD distribution in heterogeneous soil profile
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Figure 11
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HYDRUS (2D/3D)
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Two-dimensional RLD distribution in homogeneous soil profile with symmetric irrigation
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Figure 12
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HYDRUS (2D/3D)
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Two-dimensional RLD distribution in homogeneous soil profile with asymmetric irrigation
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Download the Hydrus-1D computational module (0.7 MB)
Download the Hydrus-2D computational module (0.7 MB)
Download demonstrative examples (7.4 MB)
To use the code, you can simply replace the h1d_calc.exe file in the HYDRUS installation folder (make a backup of the original file first, so that you can return to it for other applications, in which you do not want to consider this new option), or you can place it anywhere else and run it outside of the GUI (see FAQ4).
The theory behind the implementation of the root growth module is described in:
Jones, C., W. Bland, J. Ritchie, and J. R. Williams, Simulation of root growth, Modeling Plant and Soil Systems-Agronomy Monograph, Segoe Rd., Madison, WI 53711, USA, ASA-CSSA-SSSA, 31, 91-123, 1991.
Hartmann, A. and J. Šimůnek, HYDRUS Root Growth Module, Version 1. Hydrus Software Series 5, Department of Environmental Sciences, University of California Riverside, Riverside, California, USA, p. 32, 2015 (pdf).