Journal of Ecotechnology Research
Online ISSN : 1884-0388
Print ISSN : 1881-9982
ISSN-L : 1881-9982
Original Article
A mechanism of nitrate leaching from a nitrogen-limited watershed into a stream on Imizu Hill, central Japan
Hideharu HONOKITomonori KAWAKAMI
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JOURNAL FREE ACCESS

2005 Volume 11 Issue 4 Pages 189-192

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Abstract

The mechanisms of nitrate leaching from a nitrogen-limited watershed to a stream on Imizu Hill were studied. High concentrations of nitrate in the stream water were observed not only episodic events but also low flow rate condition in the stream. While watershed of this stream is on nitrogen-limited condition, high concentrations of nitrate (242 μeq/l) were observed in the surface (0.3 m of depth) soil water. When high concentrations of nitrate in the stream water i.e. over 20 μeq/l were observed, a rapid percolation of rain water into the depth of 1 m could be seen by soil temperature profile. It seems that the watershed turn to nitrogen-saturate condition from nitrogen-limited condition when rapid percolation of soil water often occurred.

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© 2005 International Association of Ecotechnology Research
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