小区域泉水水质与土地利用类型的关系

Morio Tsuji, Yutaro Nagasawa, H. Itoh, Masaki Suzuki
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摘要

利用河流阶地5个春季水样的水质年波动与冬季稳定NO3同位素含量的关系,评价了不同土地利用类型对地下水的影响。上游有林地利用的阶地边缘的两种泉水样品的成分非常相似,不受人为活动的影响。水田附近梯田表面泉水受硫酸铵影响较大,但NO3-N含量较低。被农田(菜地)包围的阶地泉水的质量表明了化肥的影响,如镁石灰和氯化铵。在一个家禽养殖场和居民区的梯田样地的泉水中,有机质中氮的浓度和K、Na、Cl离子的含量都很高。家庭排水造成的污染令人担忧。
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Relationship between Spring Water Quality and Land Use Type in a Small Area
The influence of different land use types on groundwater was evaluated on the basis of the relationship between the annual water quality fluctuation and the content of stable NO3 isotopes in winter in five spring water samples collected from a river terrace. The compositions of two spring water samples from the edge of the terrace with forested land use on the upstream side were very similar and were not affected by anthropogenic activity. Spring water collected from the terrace surface near a paddy field was influenced by ammonium sulfate, but contained low concentrations of NO3-N. The quality of spring water from a terrace site surrounded by agricultural land (a vegetable field) suggested the influence of chemical fertilizers, such as magnesian lime and ammonium chloride. In spring water from a terrace site where a poultry farming facility and residential area were located, the concentration of N derived from organic matter and the K, Na, and Cl ion contents were high. This pollution from domestic drainage is a cause of concern.
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