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Sooyong Shim Bomchul Kim Yoshihiko Hosoi Takanori Masuda 《Paddy and Water Environment》2005,3(4):211-218
The aim of this study is to quantify the dissolved organic carbon (DOC) of drainage water from paddy fields in agricultural
areas of Tottori prefecture, Japan. In four experimental paddy fields, DOC concentration varied much from 1.1 to 10.1 mg C l−1, and was the highest during heavy runoff that occurred in April when there was a non-agricultural period. However, variation
in DOC concentration did not always correspond to rainfall, but depended more on cultivation-activity events such as tilling,
planting, draining in summer, and final draining in autumn. The water discharge rate from each experimental field was estimated
by using a hydrologic model (the Tank Model and a genetic algorithm). Daily DOC export rate per unit area of three experimental
paddy fields was calculated to be 0.0074, 0.0052, and 0.0081 kg a−1 day−1, respectively. The daily DOC export rate showed large seasonal variation with the highest value in May and June. It can be
concluded that DOC export from paddy fields can be a substantial source of DOC in receiving waters, and the export rate depends
much on cultivation method practice. It might be suggested that DOC export from paddy fields can be controlled by a better
water management practice of farmers. 相似文献
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