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Groundwater Nitrate Concentration Evolution Under Climate Change and Agricultural Adaptation Scenarios: Prince Edward Island, Canada : Volume 6, Issue 2 (11/08/2015)

By Paradis, D.

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Book Id: WPLBN0004007437
Format Type: PDF Article :
File Size: Pages 56
Reproduction Date: 2015

Title: Groundwater Nitrate Concentration Evolution Under Climate Change and Agricultural Adaptation Scenarios: Prince Edward Island, Canada : Volume 6, Issue 2 (11/08/2015)  
Author: Paradis, D.
Volume: Vol. 6, Issue 2
Language: English
Subject: Science, Earth, System
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus

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Qian, B., Vigneault, H., Lefebvre, R., Paradis, D., Ballard, J., & Savard, M. M. (2015). Groundwater Nitrate Concentration Evolution Under Climate Change and Agricultural Adaptation Scenarios: Prince Edward Island, Canada : Volume 6, Issue 2 (11/08/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Natural Resources Canada, Geological Survey of Canada, Quebec City, Canada. Nitrate (N-NO3) concentration in groundwater, the sole source of potable water in Prince Edward Island (PEI, Canada), currently exceeds the 10 mg L−1 (N-NO3) health threshold for drinking water in 6 % of domestic wells. Increasing climatic and socio-economic pressures on PEI agriculture may further deteriorate groundwater quality. This study assesses how groundwater nitrate concentrations could evolve due to the forecasted climate change and its related potential changes in agricultural practices. For this purpose, a tridimensional numerical groundwater flow and mass transport model was developed for the aquifer system of the entire Island (5660 km2). A number of different groundwater flow and mass transport simulations were made to evaluate the potential impact of the projected climate change and agricultural adaptation. According to the simulations for year 2050, N-NO3 concentration would increase due to two main causes: (1) the progressive attainment of steady-state conditions related to present-day nitrogen loadings, and (2) the increase in nitrogen loadings due to changes in agricultural practices provoked by future climatic conditions. The combined effects of equilibration with loadings, climate and agricultural adaptation would lead to a 25 to 32 % increase in N-NO3 concentration over the Island aquifer system. Climate change alone (practices maintained at their current level) would contribute only 0 to 6 % to that increase according to the various climate scenarios. Moreover, simulated trends in groundwater N-NO3 concentration suggest that an increased number of domestic wells (more than doubling) would exceed the nitrate drinking water criteria. This study underlines the need to develop and apply better agricultural management practices to ensure sustainability of long-term groundwater resources. The simulations also show that observable benefits from positive changes in agricultural practices would be delayed in time due to the slow dynamics of nitrate transport within the aquifer system.

Summary
Groundwater nitrate concentration evolution under climate change and agricultural adaptation scenarios: Prince Edward Island, Canada

Excerpt
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