Plant Water Uptake Terms Evaluated for Soil Water and Solute Movement Models

© iForest -Biogeosciences and Forestry IntroductionThe relationship of vegetation cover and groundwater resources has drawn considerable scientific attention over the last decades. Many studies have shown that deforestation by logging or of natural origin (forest fire, wind damage) increased the average runoff from the affected area (e.g., Bosch & Hewlett 1982) and afforestation decreased runoff. Similar results were detected in recharge rates and groundwater depth, predominantly in dry regions. In Australia changes of vegetation from woodland to grassland or crops resulted in increases in recharge rates of one to two orders of magnitude (Maitre et al. 1999). The changes were largely due to the altered interception loss and the increased water extraction from the root zone. However, results of paired watershed research agreed only on the direction of the changes, not on their magnitude (Andressian 2004).Comparative water balance studies of forest and low vegetation covers have generally shown higher water use of forest cover (Ladekarl et al. 2005, Nachabe et al. 2005, Schilling 2007. Nachabe et al. (2005) analyzed the groundwater consumption in a shallow water table environment and estimated the annual ET for a forested area (1320 mm) and for a pasture (700 mm) using detailed soil moisture and water table monitoring. At the same time, a few studies have found negligible differences in evapotranspiration of different vegetation covers (e.g., Roberts & Rosier 2005). The latter study found that, although there were seasonal differences, on an annual basis the drainage below broadleaved woodland did not significantly differ from that below a pasture.Due to climate change, air temperature is expected to rise significantly during this century (IPCC 2007). As a direct consequence of warmer temperatures, the hydrological cycle will undergo changes with accompanying alteration in the rates of precipitation and evaporation. In Hungary, summer temperatures is expected to increase by up to four degrees by the end of this century, while precipitation is likely to increase in winter and decrease in summer (Gálos et al. 2007).The impact of climate change on groundwater resources was reviewed lately by Green et al. (2011). Although the uncertainty of predictions for change in groundwater recharge rates and discharge is large (e.g., future climate scenarios and groundwater extraction), numerous studies found that groundwater resources appear to be threatened by future climate change due to increased natural and human water demand.In light of the water balance uncertainties and the increasing pressures on groundwater resources due to future climate change, a comparative water balance study of an oak forest and fallow vegetation plots was initiated in a drought-threatened lowland environment in north-eastern Hungary. Water balance components were estimated by the Hydrus 1-D numerical model (Simunek et al. 2005), calibrated on measured soil moisture and groundwater levels.Our research questions were the following: (1) what is the m...

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“…Actual Water Uptake Rate SALTMED uses the formula suggested by Cardon and Letey (1992), which determines the water uptake S (mm day -1 ) as:…”

Section: Plant Water Uptake In Presence Of Saline Watermentioning

confidence: 99%

Integrated Management Tool for Water, Crop, Soil and N‐Fertilizers: The Saltmed Model

Ragab

2015

Irrigation and Drainage

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Article (refereed) -postprint Ragab, Ragab. 2015 The model provides academics, professionals and extension services with a management tool for crops, soil, water and nitrogen fertilizers. This paper describes the processes, the equations of the model and summarises the different applications and results obtained. This paper will be followed by a number of detailed papers dedicated to the model application and the impact of different field management strategies on food production.

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Plant Water Uptake Terms Evaluated for Soil Water and Solute Movement Models

Cited by 102 publications

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The Effect of Saline Irrigation Water on the Yield of Pepper: Experimental and Modelling Study

The Effect of Saline Irrigation Water on the Yield of Pepper: Experimental and Modelling Study

Comparative water balance study of forest and fallow plots

Integrated Management Tool for Water, Crop, Soil and N‐Fertilizers: The Saltmed Model

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