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APEX 모형을 이용한 유기농경지에서의 질소 부하량 저감을 위한 지표피복 효과

Surface Cover Effect for Reducing Nitrogen Load in Organic Farming Fields using APEX Model

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참고문헌

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주제분류농학

초록

The objectives of this study were to monitor organic farming upland compared with conventional upland field and to evaluate nutrient loads reductionof surface cover effect with long-term historical climate data. APEX(Agricultural Policy Environmental eXtender) model was validated with experimentaldata and used for assessing surface cover scenarios for 30-year simulation periods. The validated values of RMSE(Root Mean Square Error),RMAE(Root Mean Absolute Error), R2 and E(Nash-Sutcliffe efficiency) for runoff were 1.17-1.37 mm/day, 0.28-0.45 mm/day, 0.88-0.90 and 0.82–0.94in two treatments, respectively. Those for water quality (nitrogen) were 0.05-0.16 kg/ha, 0.52-0.75 kg/ha, 0.67-0.72 and 0.32–0.70 in two treatments,respectively, and therefore the validated model showed good agreement with the observed runoff and nitrogen load for the study period. Whendecreasing the surface cover rate of organic farming field to 75%, 50%, 25%, and 0% (conventional field), average annual runoff increased by 7%,15%, 23% and 31%, respectively. Under same condition of decreasing the surface cover rate, average annual nitrogen loads increased by 1.4 times,1.7 times, 2.0 times, and 2.3 times compared with organic farming field, respectively. This study showed that it is possible to present an appropriatesurface cover ratio to maintain conventional production and minimize nonpoint sources pollution for organic farming system, although long-termmonitoring is needed to determine its effects on environmental concerns, crop competition, and other uncertainty.

Abstract

The objectives of this study were to monitor organic farming upland compared with conventional upland field and to evaluate nutrient loads reductionof surface cover effect with long-term historical climate data. APEX(Agricultural Policy Environmental eXtender) model was validated with experimentaldata and used for assessing surface cover scenarios for 30-year simulation periods. The validated values of RMSE(Root Mean Square Error),RMAE(Root Mean Absolute Error), R2 and E(Nash-Sutcliffe efficiency) for runoff were 1.17-1.37 mm/day, 0.28-0.45 mm/day, 0.88-0.90 and 0.82–0.94in two treatments, respectively. Those for water quality (nitrogen) were 0.05-0.16 kg/ha, 0.52-0.75 kg/ha, 0.67-0.72 and 0.32–0.70 in two treatments,respectively, and therefore the validated model showed good agreement with the observed runoff and nitrogen load for the study period. Whendecreasing the surface cover rate of organic farming field to 75%, 50%, 25%, and 0% (conventional field), average annual runoff increased by 7%,15%, 23% and 31%, respectively. Under same condition of decreasing the surface cover rate, average annual nitrogen loads increased by 1.4 times,1.7 times, 2.0 times, and 2.3 times compared with organic farming field, respectively. This study showed that it is possible to present an appropriatesurface cover ratio to maintain conventional production and minimize nonpoint sources pollution for organic farming system, although long-termmonitoring is needed to determine its effects on environmental concerns, crop competition, and other uncertainty.

참고문헌 (38)

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