scholarly journals Evaluating the Effects of Mulch and Irrigation Amount on Soil Water Distribution and Root Zone Water Balance Using HYDRUS-2D

Water ◽  
2015 ◽  
Vol 7 (12) ◽  
pp. 2622-2640 ◽  
Author(s):  
Ming Han ◽  
Chengyi Zhao ◽  
Gary Feng ◽  
Yingyu Yan ◽  
Yu Sheng
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Water Distribution ◽  
Root Zone ◽  
Irrigation Amount ◽  
Soil Water Distribution ◽  
Zone Water

scholarly journals The effect of hysteresis on soil water dynamics during surface trickle irrigation in layered soils

2013 ◽  
Vol 15 (3) ◽  
pp. 351-365 ◽  
Keyword(s):  
Numerical Model ◽  
Soil Water ◽  
Water Distribution ◽  
Root Zone ◽  
Distribution Patterns ◽  
Irrigation Efficiency ◽  
Water Dynamics ◽  
Trickle Irrigation ◽  
Soil Water Dynamics ◽  
Soil Water Distribution

<p>In this study, the development of a numerical model simulating surface drip irrigation from equidistant line sources in stratified soils under various conditions is being presented. The developed numerical model was used to investigate the effects of hysteresis, discharge rate, and soil hydraulic properties on soil water dynamics in stratified soils under surface trickle irrigation. Soil water dynamics were simulated for two sequences of soil layers and for two drip lines discharge rates. Soil water distribution patterns, for all conditions examined, were computed first neglecting hysteresis by using the boundary wetting curve only and second considering hysteresis to evaluate the effect of hysteresis on the obtained results. The numerical results showed that hysteresis has a profound effect on the computed soil water distribution patterns and that the draining process progresses more quickly when hysteresis is neglected than when hysteresis is considered. The inclusion of hysteresis results in reduced water losses under the root zone. Moreover, this reduction seems to be more significant in the case that a fine soil is located below a coarse soil. The results also showed that the irrigation efficiency is higher in the same case; however, irrigation efficiency is generally high in all the examined cases of stratified soils.</p>

Soil Water Distribution and Movement in Layered Soils of a Dam Farmland

2010 ◽  
Vol 24 (14) ◽  
pp. 3871-3883 ◽  
Author(s):  
Peipei Zhao ◽  
Ming-an Shao ◽  
Ahmed A. Melegy
Keyword(s):  
Soil Water ◽  
Water Distribution ◽  
Layered Soils ◽  
Soil Water Distribution

scholarly journals A thermodynamic formulation of root water uptake

2016 ◽  
Vol 20 (8) ◽  
pp. 3441-3454 ◽  
Author(s):  
Anke Hildebrandt ◽  
Axel Kleidon ◽  
Marcel Bechmann
Keyword(s):  
Soil Water ◽  
Water Uptake ◽  
Water Distribution ◽  
Bound Water ◽  
Root Water Uptake ◽  
Flow Path ◽  
Thermodynamic Evaluation ◽  
Entire Flow ◽  
Soil Water Distribution

Abstract. By extracting bound water from the soil and lifting it to the canopy, root systems of vegetation perform work. Here we describe how root water uptake can be evaluated thermodynamically and demonstrate that this evaluation provides additional insights into the factors that impede root water uptake. We derive an expression that relates the energy export at the base of the root system to a sum of terms that reflect all fluxes and storage changes along the flow path in thermodynamic terms. We illustrate this thermodynamic formulation using an idealized setup of scenarios with a simple model. In these scenarios, we demonstrate why heterogeneity in soil water distribution and rooting properties affect the impediment of water flow even though the mean soil water content and rooting properties are the same across the scenarios. The effects of heterogeneity can clearly be identified in the thermodynamics of the system in terms of differences in dissipative losses and hydraulic energy, resulting in an earlier start of water limitation in the drying cycle. We conclude that this thermodynamic evaluation of root water uptake conveniently provides insights into the impediments of different processes along the entire flow path, which goes beyond resistances and also accounts for the role of heterogeneity in soil water distribution.

Mobility of a Polyether Trisiloxane Surfactant in Soil: Soil/Water Distribution Coefficients and Leaching in a Soil Column

2016 ◽  
Vol 227 (2) ◽  
Author(s):  
Amandine Michel ◽  
Conrad Dietschweiler ◽  
Martina Böni ◽  
Michael Burkhardt ◽  
Heinz-Jürgen Brauch ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Distribution ◽  
Soil Column ◽  
Distribution Coefficients ◽  
Soil Water Distribution

Estimating yield of sorghum using root zone water balance model and spectral characteristics of crop in a dryland Alfisol

2007 ◽  
Vol 87 (3) ◽  
pp. 315-327 ◽  
Author(s):  
Uttam Kumar Mandal ◽  
U.S. Victor ◽  
N.N. Srivastava ◽  
K.L. Sharma ◽  
V. Ramesh ◽  
...  
Keyword(s):  
Water Balance ◽  
Root Zone ◽  
Spectral Characteristics ◽  
Water Balance Model ◽  
Balance Model ◽  
Zone Water

scholarly journals WAYS v1: a hydrological model for root zone water storage simulation on a global scale

2019 ◽  
Vol 12 (12) ◽  
pp. 5267-5289 ◽  
Author(s):  
Ganquan Mao ◽  
Junguo Liu
Keyword(s):  
Spatial Heterogeneity ◽  
Soil Water ◽  
Regional Differences ◽  
Hydrological Model ◽  
Root Zone ◽  
Water Storage ◽  
Global Scale ◽  
Distribution Model ◽  
Lumped Model ◽  
Zone Water

Abstract. The soil water stored in the root zone is a critical variable for many applications, as it plays a key role in several hydrological and atmospheric processes. Many studies have been conducted to obtain reliable information on soil water in the root zone layer. However, most of them are mainly focused on the soil moisture within a certain depth rather than the water stored in the entire rooting system. In this work, a hydrological model named the Water And ecosYstem Simulator (WAYS) is developed to simulate the root zone water storage (RZWS) on a global scale. The model is based on a well-validated lumped model and has now been extended to a distribution model. To reflect the natural spatial heterogeneity of the plant rooting system across the world, a key variable that influences RZWS, i.e., root zone storage capacity (RZSC), is integrated into the model. The newly developed model is first evaluated based on runoff and RZWS simulations across 10 major basins. The results show the ability of the model to mimic RZWS dynamics in most of the regions through comparison with proxy data, the normalized difference infrared index (NDII). The model is further evaluated against station observations, including flux tower and gauge data. Despite regional differences, generally good performance is found for both the evaporation and discharge simulations. Compared to existing hydrological models, WAYS's ability to resolve the field-scale spatial heterogeneity of RZSC and simulate RZWS may offer benefits for many applications, e.g., agriculture and land–vegetation–climate interaction investigations. However, the results from this study suggest an additional evaluation of RZWS is required for the regions where the NDII might not be the correct proxy.

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