Quality of Underground and River Water around the Kasanohara Shirasu Plateau in Kagoshima Prefecture
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Accession number;07A0024746
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| Title;Quality of Underground and River Water around the Kasanohara Shirasu Plateau in Kagoshima Prefecture |
| Author;
MATSUMOTO JUN
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
MOCHIDA TOSHIYUKI
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
FURUE KOJI
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
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Journal Title;Kagoshimaken Nogyo Shikenjo Kenkyu Hokoku
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Journal Code:Y0103A
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ISSN:0388-8215
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VOL.;NO.33;PAGE.41-48(2005)
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| Figure&Table&Reference;FIG.12, TBL.1, REF.11 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Andosol field of 4,800ha is distributed in the Kasanohara plateau consisting of Shirasu where upland farming and livestock breeding are mainly practiced producing nitrogen of 3,500Mg annually. Underground water comes out as spring in many sites around the plateau; it is a main source of drinking water for local residents. Nitrate concentration of underground water was monitored every month to clarify the influence of nitrogen of the agricultural origin on the quality of underground water. In addition, quality of river water originating from the underground water was examined. The obtained results were as follows: 1) It was guessed that underground water flowed mainly into Nakayama valley located in the middle south region from the northwest region, secondary to the west side from the central ridge around the northwest region, and lastly to the east side around the northeast region. 2) The nitrate concentration of underground water at 23 sites ranged between 3.3 and 17.6 mg L'-1', and was in order of the region of west > middle south> northeast, indicating obviously a nitrogen load due to the drain of nitrate. 3) There was a site where the nitrate-N concentration exceeded the environmental standard of 10mg L'-1' with western ground water, and this ground water declined quality of the Kimotsuki River water remarkably. 4) The nitrate nitrogen concentration of the underground water of the Nakayama valley was high with a value near 10mg L'-1'. It was pointed out that a follow-up survey is needed in the Nakayama valley where is afraid of a nitrogen load originating from the northwest region. (author abst.) |
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