Water-saving irrigation of paddy field to reduce nutrient runoff  

作　　者：Tadayoshi Hitomi Yusaku Iwamoto Asa Miura Koji Hamada Kyoji Takaki Eisaku Shiratani 

机构地区：[1]National Institute for Rural Engineering [2]Kyusyu Regional Agricultural Administration Office

出　　处：《Journal of Environmental Sciences》2010年第6期885-891,共7页环境科学学报（英文版）

摘　　要：The purpose of this work is to study the effect of a type of water-saving irrigation （WSI） on nutrient runoff of paddy field. The volume of surface drainage was maintained low by WSI. In particular, WSI effectively reduced surface drainage in rain events. Model simulation indicated that net runoff load of total nitrogen （TN） from the paddy field was increased by WSI. Meanwhile, net runoff loads of total phosphorus （TP） and total organic carbon （TOC） from the paddy field was decreased by WSI. Because ponding waters of the study fields were enriched with TP and TOC, WSI reduced runoff of these nutrients by controlling the volume of surface drainage. WSI could be considered an efficient method for reducing runoff loads and could conserve water quality in an agricultural watershed.The purpose of this work is to study the effect of a type of water-saving irrigation （WSI） on nutrient runoff of paddy field. The volume of surface drainage was maintained low by WSI. In particular, WSI effectively reduced surface drainage in rain events. Model simulation indicated that net runoff load of total nitrogen （TN） from the paddy field was increased by WSI. Meanwhile, net runoff loads of total phosphorus （TP） and total organic carbon （TOC） from the paddy field was decreased by WSI. Because ponding waters of the study fields were enriched with TP and TOC, WSI reduced runoff of these nutrients by controlling the volume of surface drainage. WSI could be considered an efficient method for reducing runoff loads and could conserve water quality in an agricultural watershed.

关 键 词：model simulation net runoff load storage capacity surface drainage tank model water management 

分 类 号：S511[农业科学—作物学]