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Impact of switching crop type on water and solute fluxes in deep vadose zone
Year:
2015
Source of publication :
Water Resources Research
Authors :
קורצמן, דניאל
;
.
Volume :
51
Co-Authors:
Turkeltaub, T., Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Department of Hydrology and Microbiology, Ben Gurion University of the Negev, Sede Boqer Campus, Israel, Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, Beit Dagan, Israel
Kurtzman, D., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, Beit Dagan, Israel
Russak, E.E., Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beersheva, Israel
Dahan, O., Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Department of Hydrology and Microbiology, Ben Gurion University of the Negev, Sede Boqer Campus, Israel
Facilitators :
From page:
9828
To page:
9842
(
Total pages:
15
)
Abstract:
Switching crop type and consequently changing irrigation and fertilization regimes lead to alterations in deep percolation and solute concentrations of pore water. Herein, observations from the deep vadose zone and model simulations demonstrate the changes in water, chloride, and nitrate fluxes under a commercial greenhouse following the change from tomato to lettuce cropping. The site, located above a phreatic aquifer, was monitored for 5 years. A vadose-zone monitoring system was implemented under the greenhouse and provided continuous data on both temporal variations in water content and chemical composition of the pore water at multiple depths in the deep vadose zone (up to 20 m). Following crop switching, a significant reduction in chloride concentration and dramatic increase in nitrate were observed across the unsaturated zone. The changes in chemical composition of the vadose-zone pore water appeared as sequential breakthroughs across the unsaturated zone, initiating at land surface and propagating down toward the water table. Today, 3 years after switching the crops, penetration of the impact exceeds 10 m depth. Variations in the isotopic composition of nitrate (18O and 15N) in water samples obtained from the entire vadose zone clearly support a fast leaching process and mobilization of solutes across the unsaturated zone following the change in crop type. Water flow and chloride transport models were calibrated to observations acquired during an enhanced infiltration experiment. Forward simulation runs were performed with the calibrated models, constrained to tomato and lettuce cultivation regimes as surface boundary conditions. Predicted chloride and nitrate concentrations were in agreement with the observed concentrations. The simulated water drainage and nitrogen leaching implied that the observed changes are an outcome of recommended agricultural management practices. © 2015. American Geophysical Union. All Rights Reserved.
Note:
Related Files :
aquifers
fertilizer application
Fruits
greenhouses
groundwater
Ground water recharge
Nitrates
vadose zone
water
עוד תגיות
תוכן קשור
More details
DOI :
10.1002/2015WR017612
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20133
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:34
Scientific Publication
Impact of switching crop type on water and solute fluxes in deep vadose zone
51
Turkeltaub, T., Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Department of Hydrology and Microbiology, Ben Gurion University of the Negev, Sede Boqer Campus, Israel, Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, Beit Dagan, Israel
Kurtzman, D., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, Beit Dagan, Israel
Russak, E.E., Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beersheva, Israel
Dahan, O., Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Department of Hydrology and Microbiology, Ben Gurion University of the Negev, Sede Boqer Campus, Israel
Impact of switching crop type on water and solute fluxes in deep vadose zone
Switching crop type and consequently changing irrigation and fertilization regimes lead to alterations in deep percolation and solute concentrations of pore water. Herein, observations from the deep vadose zone and model simulations demonstrate the changes in water, chloride, and nitrate fluxes under a commercial greenhouse following the change from tomato to lettuce cropping. The site, located above a phreatic aquifer, was monitored for 5 years. A vadose-zone monitoring system was implemented under the greenhouse and provided continuous data on both temporal variations in water content and chemical composition of the pore water at multiple depths in the deep vadose zone (up to 20 m). Following crop switching, a significant reduction in chloride concentration and dramatic increase in nitrate were observed across the unsaturated zone. The changes in chemical composition of the vadose-zone pore water appeared as sequential breakthroughs across the unsaturated zone, initiating at land surface and propagating down toward the water table. Today, 3 years after switching the crops, penetration of the impact exceeds 10 m depth. Variations in the isotopic composition of nitrate (18O and 15N) in water samples obtained from the entire vadose zone clearly support a fast leaching process and mobilization of solutes across the unsaturated zone following the change in crop type. Water flow and chloride transport models were calibrated to observations acquired during an enhanced infiltration experiment. Forward simulation runs were performed with the calibrated models, constrained to tomato and lettuce cultivation regimes as surface boundary conditions. Predicted chloride and nitrate concentrations were in agreement with the observed concentrations. The simulated water drainage and nitrogen leaching implied that the observed changes are an outcome of recommended agricultural management practices. © 2015. American Geophysical Union. All Rights Reserved.
Scientific Publication
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