Global Advanced Research Journal of Plant Science (GARJPS)

February 2015 Vol. 1(1): pp. 017-029

Copyright © 2015 Global Advanced Research Journals

 

Full Length Research Paper

Eucalyptus camaldulensis Dehnh. Offers Excellent Potential to Reduce NO3ˉ Concentration in Groundwater

Mehrdad MohammadniaA Sayyed Ahang KowsarB, and Che Fauziah IshakC

AB Fars research center for agriculture and natural resources, Shiraz, I.R.Iran

University Putra Malaysia

*Corresponding Author’s Email: ahangkowsar@hotmail.com

Accepted 01 December, 2013

Abstract

Geologic and fertilizer N negatively impact the groundwater in the Gareh Bygone Plain (GBP) in southeastern I.R. Iran. Moreover, the floodwater used since 1983 for the artificial recharge of groundwater (ARG) to alleviate the water crisis in the GBP contains 60.30 ± 21.60 mg L-1 geologic NO3ˉ on average. This has the potential to intensify the contamination. As the Agha Jari Formation, which supplies the NO3ˉcontaminated runoff, covers 27680 km2 in the southern I.R. Iran, an untold number of people will be affected with nitrate poisoning where such waters are inevitably used for the ARG. Dissolved NO3ˉ concentrations were monitored monthly for a year in 30 shallow wells in a sandy-gravelly aquifer in the GBP to quantify the effects of different landuse and Eucalyptus camaldulensis Dehnh. on nitrogen retention. A laboratory experiment was also conducted to verify the potential nitrate absorption of the eucalyptus and NO3ˉ surface adsorption potential of the calcareous sand. Our results suggest that landuse and management practices significantly impacted groundwater NO3ˉ (P<0.05), EC (P<0.01), and its pH (P<0.05) in the GBP. Floodwater NO3ˉ was highly reduced when passed through the vadose zone where NO3ˉ was absorbed by the eucalyptus roots and adsorbed by the free CaCOin the calcareous alluvium. The amount of NO3ˉ retained by the roots was 770 fold the amount retained by the free CaCO3 particleson the surface area basis. Therefore, establishing forested filter zones within the ARG systems using more efficient and native plant species supplies safer drinking water for rural inhabitants and desert-dwellers. 

Keywords: Eucalyptus camaldulensis Dehnh, NO3ˉ Concentration in Groundwater.     

 

 

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