Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
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Volume 51, Issue 5
Displaying 1-5 of 5 articles from this issue
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  • Evaluating the Influence of Environmental Factors on Mountain Stream Nitrate Concentrations in Miyazaki Prefecture
    Nay Lin MAUNG, Naoko TOKUCHI, Soyoka MAKINO
    Article type: research-article
    2022 Volume 51 Issue 5 Pages 267-278
    Published: September 20, 2022
    Released on J-STAGE: October 17, 2022
    DOIhttps://doi.org/10.5956/jriet.51.5_267
    JOURNAL FREE ACCESS
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    Long-term nitrogen (N) loading on forest ecosystems can lead to "N-saturated forests". Such ecosystems are likely to have high stream nitrate (NO3-) concentrations. Recent increases in atmospheric emissions from livestock and agriculture activities and combustion of fossil fuels have changed the N cycle in terrestrial ecosystems. We investigated stream NO3- concentrations from 200 forest catchments free from human disturbances within Miyazaki Prefecture and assessed the relationships with N depositions and catchment properties (e.g., climate, topography, vegetation, geology, and soil). Stream NO3- concentration ranging from 0.01-1.07 ㎎ N L-1 indicating that factors controlling stream NO3- concentration were variable. High NO3- concentrations were more common for sites with low annual precipitation, high ammonia emission-based N depositions from livestock and agriculture, and high annual N deposition. Temperature, elevation, and radiation are also important factors. Our study is the first to show the influence of livestock and agriculture via N deposition on mountain stream chemistry in Japan.

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