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Identification of nitrogen sources to four small lakes in the agricultural region of Khorezm, Uzbekistan

Biogeochemistry

By:
, , , , , and
DOI: 10.1007/s10533-010-9509-3

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Abstract

Pollution of inland waters by agricultural land use is a concern in many areas of the world, and especially in arid regions, where water resources are inherently scarce. This study used physical and chemical water quality and stable nitrogen isotope (δ15N) measurements from zooplankton to examine nitrogen (N) sources and concentrations in four small lakes of Khorezm, Uzbekistan, an arid, highly agricultural region, which is part of the environmentally-impacted Aral Sea Basin. During the 2-year study period, ammonium concentrations were the highest dissolved inorganic N species in all lakes, with a maximum of 3.00 mg N l−1 and an average concentration of 0.62 mg N l−1. Nitrate levels were low, with a maximum concentration of 0.46 mg N l−1 and an average of 0.05 mg N l−1 for all four lakes. The limited zooplankton δ15N values did not correlate with the high loads of synthetic fertilizer applied to local croplands during summer months. These results suggest that the N cycles in these lakes may be more influenced by regional dynamics than agricultural activity in the immediate surroundings. The Amu-Darya River, which provides the main source of irrigation water to the region, was identified as a possible source of the primary N input to the lakes.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Identification of nitrogen sources to four small lakes in the agricultural region of Khorezm, Uzbekistan
Series title:
Biogeochemistry
DOI:
10.1007/s10533-010-9509-3
Volume
101
Issue:
1-3
Year Published:
2010
Language:
English
Publisher:
Springer
Contributing office(s):
Nevada Water Science Center
Description:
12 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Biogeochemistry
First page:
357
Last page:
368
Country:
Uzbekistan
State:
Khorezm