Evaluation of Spatial and Temporal Root Water Uptake Patterns of a Flood-Irrigated Pecan Tree Using the HYDRUS (2D/3D) Model

Deb, Sanjit K.; Shukla, Manoj K.; Šimůnek, Jiřı́; Mexal, John G.

doi:10.1061/(asce)ir.1943-4774.0000611

Cited by 43 publications

(31 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2)- (3)] were within the range of the a-priori parameter distribution and their optimized values previously reported in a HYDRUS-1D model (Šimůnek et al 2013) validation study in this onion field (Deb et al 2011). Moreover, similar discrepancies (i.e., RMSE, ME, and d) between the measured and simulated θ values were reported in Deb et al (2013).…”

Section: Resultssupporting

confidence: 84%

“…3). Small differences between the measured and simulated θ values may be partially attributed to measurement errors, which are inevitable under field conditions (Deb et al 2011(Deb et al , 2013. Overall, statistics of RMSE, ME, and the index of agreement (d) for simulated and measured θ values [Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…HYDRUS evaluation was carried out by comparing field measured volumetric water contents (θ) with model simulations using the quantitative measures of model uncertainty reported in Deb et al (2013), such as the root mean square error (RMSE), the mean bias error (ME), and an index of agreement (d), which are defined as…”

Section: Field Measurements and Model Input Requirementsmentioning

confidence: 99%

“…The HYDRUS model has been extensively used for simulating water flow and solute transport in a variety of soil geometries, irrigation systems, and fertigation strategies for different crops [e.g., Cote et al (2003), Gärdenäs et al (2005), Hanson et al (2006), Crevoisier et al (2008), andSiyal et al (2012)]. Notably, HYDRUS (2D/3D) has also proven to be an effective tool in improving our understanding of the soil-plant-atmosphere water relations in irrigated orchards of southern New Mexico (Deb et al 2013).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Evaluation of Nitrate Distributions in the Onion Root Zone under Conventional Furrow Fertigation

et al. 2016

Self Cite

View full text Add to dashboard Cite

HYDRUS (2D/3D) model was used to simulate spatial and temporal distributions of nitrate-nitrogen (NO 3 -N) within and below the onion root zone under conventional furrow fertigation with the urea-ammonium-nitrate (UAN) liquid fertilizer. The simulated water contents in the furrow irrigated onion field agreed well with the measurements. Simulations produced similar patterns of the measured NO 3 -N concentration profiles throughout the growing season. NO 3 -N concentrations remained higher and accumulation of NO 3 -N was observed within the root zone. Higher NO 3 -N within the root zone was dependent on the rate of the UAN fertilizer application, quantity of NO 3 -N removed by root uptake, and NO 3 -N drainage fluxes below the root zone. Simulations also suggested that NO 3 -N below the root zone during different growth stages remained much higher than a recommended (for drinking water) standard concentration level (10 mg L −1 ). This resulted in higher NO 3 -N drainage fluxes, particularly during the fertigation events between the establishment and vegetative growth stages. This indicates the need to apply most fertigation events at an early stage of bulb formation to provide the maximum NO 3 -N demands by onions and to reduce potential NO 3 -N leaching.

show abstract

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Field Measurements and Model Input Requirementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Evaluation of Nitrate Distributions in the Onion Root Zone under Conventional Furrow Fertigation

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the other hand, root water uptake is also spatially variable in the subsurface due to highly heterogeneous root distribution of woody species (Clothier and Green, 1994;Green and Clothier, 1999;Vrugt et al, 2001;Deb et al, 2013). These spatial phenomena have important hydro-ecological consequences because they significantly affect the magnitude and distribution of groundwater recharge and solute transport Guswa and Spence, 2012;Nikodem et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Vegetation Effects on Soil Moisture and Groundwater Recharge in Subtropical Coastal Sand Dunes

Fan¹

View full text Add to dashboard Cite

Vegetation can potentially have a strong influence on the water budget and hydrological processes in vegetated ecosystems due to canopy rainfall interception and the partitioning of rainfall into throughfall and stemflow, as well as root water uptake from the vadose zone or groundwater table. This study aims to explore the potential effects of vegetation on soil moisture dynamics and groundwater recharge in a subtropical coastal area of eastern Australia. This area is characterized by highly permeable sands, intense summer rainfall events and three typical vegetation covers (exotic pine plantation, native woodland and grassland).First of all, the spatial variability of both throughfall and stemflow at the soil surface was investigated in a 12-year-old managed pine plantation over one year on Bribie Island using tipping-bucket rain gauges. Rainfall loss by canopy interception and subsequent evaporation from this pine plantation and a native banksia woodland were also quantified and compared using field measurements and two analytical models of rainfall interception.In addition, the potential hydrological impacts of changes in vegetation cover in this shallow sandy groundwater system (depth to water table < 2 m) was evaluated by estimating groundwater recharge and discharge by evapotranspiration (ET g ) under the three contrasting vegetation covers over a 2-year period using the water table fluctuation method and the White method, respectively.To further monitor the actual water percolation processes in deep sand dune profiles (depth to water table > 10 m), spatial patterns and seasonal dynamics of root-zone soil moisture were quantified under three contrasting vegetation covers on North StradbrokeIsland by combining two geophysical techniques: surface electric resistivity tomography (surface ERT) and spatial time domain reflectometry (spatial TDR). Based on the field investigations of rainfall and root distributions at the under-canopy and inter-canopy zones, spatial distributions of vadose zone soil moisture and deep drainage in this subtropical coastal forest overlying deep sand dunes were finally simulated using HYDRUS models.On the Bribie Island sites, the highest throughfall was found on the east side of the tree trunks (~85% of gross rainfall) and the lowest in the midway between tree rows (~68% of gross rainfall) in the pine plantation. These spatial patterns persist for around 84% of recorded rainfall events. This is explained by canopy interception of the inclined rainfall resulting from the prevailing easterly wind direction throughout the experiment. Annual ii rainfall interception loss in the banksia woodland was lower (~16% of gross rainfall) than that in the pine plantation (~23% of gross rainfall) due to the lower canopy storage capacity and higher aerodynamic resistance of the banksia woodland. The RGAM and WiMo models predicted the interception losses from these forest stands reasonably well.The average annual gross recharge was largest at the sparse grassland site, followed by the exotic...

show abstract

Spatial and diurnal below canopy evaporation in a desert vineyard: Measurements and modeling

Kool

Ben‐Gal

Agam

et al. 2014

Water Resources Research

View full text Add to dashboard Cite

Evaporation from the soil surface (E) can be a significant source of water loss in arid areas. In sparsely vegetated systems, E is expected to be a function of soil, climate, irrigation regime, precipitation patterns, and plant canopy development and will therefore change dynamically at both daily and seasonal time scales. The objectives of this research were to quantify E in an isolated, drip-irrigated vineyard in an arid environment and to simulate below canopy E using the HYDRUS (2-D/3-D) model. Specific focus was on variations of E both temporally and spatially across the inter-row. Continuous above canopy measurements, made in a commercial vineyard, included evapotranspiration, solar radiation, air temperature and humidity, and wind speed and direction. Short-term intensive measurements below the canopy included actual and potential E and solar radiation along transects between adjacent vine-rows. Potential and actual E below the canopy were highly variable, both diurnally and with distance from the vine-row, as a result of shading and distinct wetted areas typical to drip irrigation. While the magnitude of actual E was mostly determined by soil water content, diurnal patterns depended strongly on position relative to the vine-row due to variable shading patterns. HYDRUS (2-D/3-D) successfully simulated the magnitude, diurnal patterns, and spatial distribution of E, including expected deviations as a result of variability in soil saturated hydraulic conductivity.

show abstract

Evaluation of Spatial and Temporal Root Water Uptake Patterns of a Flood-Irrigated Pecan Tree Using the HYDRUS (2D/3D) Model

Cited by 43 publications

References 39 publications

Numerical Evaluation of Nitrate Distributions in the Onion Root Zone under Conventional Furrow Fertigation

Numerical Evaluation of Nitrate Distributions in the Onion Root Zone under Conventional Furrow Fertigation

Vegetation Effects on Soil Moisture and Groundwater Recharge in Subtropical Coastal Sand Dunes

Spatial and diurnal below canopy evaporation in a desert vineyard: Measurements and modeling

Contact Info

Product

Resources

About