Hydrological Research Letters
Online ISSN : 1882-3416
ISSN-L : 1882-3416
The spatial and temporal distribution of rice herbicides in Lake Biwa, Japan
Lidia L. TanakaMiki SudoSyuhei Ban
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2009 Volume 3 Pages 45-48


The plains on the lowlands surrounding Lake Biwa, Japan, have long been used for rice (Oriza sativa L.) cultivation. In this study, we investigate the fate of herbicides commonly used in this agroecosystem. During the spring, the highest concentrations of simetryn, mefenacet, bromobutide and dymron were detected on the lake’s surface and at the mid-depth (20 m), indicating that agricultural runoff enters the lake and directly affects its water quality. Our findings also suggest that these contaminants might serve as an indicator of the transport pathways of some agricultural pollutants into the lake.

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© 2009 Japan Society of Hydrology and Water Resources
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