Modeling Fluctuations in the Water Quality of Effluent from a Tea Cultivation Drainage Area. Focus on Nitrate-Nitrogen Concentration.

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  • 茶栽培流域における水質変動のモデル化　　硝酸性窒素に注目して
  • チャ サイバイ リュウイキ ニ オケル スイシツ ヘンドウ ノ モデルカ ショウサンセイ チッソ ニ チュウモク シテ

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Abstract

Effluent from a tea plantation was monitored for one year in Shizuoka Prefecture, Japan. Seasonal fluctuations in the concentrations of multiple chemical components and in the nitrogen isotope ratio of nitrate were clearly revealed. A Water quality model based on flow rate and the quantity of nitrate accumulated was developed to estimate the concentration of nitrate in the Tea plantation effluent. Fluctuations in the loads of all that substances in the effluent did not depend on the time of fertilizer input. The nitrogen isotope ratio of nitrate in the effluent fluctuated for 9.0-13.5‰ except during a period of water shortage in August. it is estimated that the δ15N value of the organic fertilizer is reflected in δ15N value of groundwater in this area. Concentrations of SO42-, C1-, Na, Ca, Sr were explained by the natural logarithm of the flow rate, and concentrations of K, Mg, F-, Mn, Ni were explained by the NO3- concentration in a liner regression model to good precision. Relative errors between the observed and calculated concentration determined by the regression model were within 8%. In the water quality model forNO3- concentration, seasonal fluctuations and the range of calculated nitrate concentrations corresponded to observed data.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 15 (3), 163-172, 2002

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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