水環境学会誌
Online ISSN : 1881-3690
Print ISSN : 0916-8958
ISSN-L : 0916-8958
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茶園小流域からの窒素,リン,CODの排出負荷量の推定
武田 育郎國松 孝男木原 康孝森 也寸志
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ジャーナル フリー

2002 年 25 巻 9 号 p. 565-570

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An investigation on water quality was conducted in a small catchment of a tea field for three years, and runoff loads of total nitrogen (T-N), total phosphorus (T-P) and chemical oxygen demand (COD) were estimated. Runoff quantity was estimated using a water-balance equation. The annual runoff loads of T-N were estimated to be 61.0 kg·ha-1 for the first year, 193 kg·ha-1 for the second year, and 88.1 kg·ha-1 for the third year, and the average load for the three years was 114.1 kg·ha-1. The ratio of the nitrogen load to the amount of applied nitrogen fertilizer was 17.1%, being much lower than in previous studies. The main reason for the low ratio obtained in this study was the lower concentration of nitrogen. The annual runoff loads of T-P and COD were estimated to be 0.68 kg·ha-1 and 59 kg·ha-1, respectively, and both were affected by the flushing effect on rainy days. This result suggests the importance of monitoring of phosphorus and COD as well as nitrogen in upland fields.

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© 2002 公益社団法人 日本水環境学会
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