CAJ | 학술논문

该文针对美国密西西比河上游明尼苏达州农田排水氮素流失严重,近年来又大力发展生物燃料产业的现状,采用田间水文模型-DRAINMOD模拟分析了玉米.大豆轮作区改种多年生草类后对农田排水的水文效应.结果表明改种多年生草后,植物耗水量的增加使得农田排水量明显减少;较深的草根系,尤其是在干旱年份消耗了大量的深层土壤水,降低了地下水位.种草后的生物排水量远远大于其他工程措施(如增加排水间距或潜埋排水管等),可显著减少农田排水氮素流失对水环境的影响.
해문침대미국밀서서비하상유명니소체주농전배수담소류실엄중,근년래우대력발전생물연료산업적현상,채용전간수문모형-DRAINMOD모의분석료옥미.대두륜작구개충다년생초류후대농전배수적수문효응.결과표명개충다년생초후,식물모수량적증가사득농전배수량명현감소;교심적초근계,우기시재간한년빈소모료대량적심층토양수,강저료지하수위.충초후적생물배수량원원대우기타공정조시(여증가배수간거혹잠매배수관등),가현저감소농전배수담소류실대수배경적영향.
In the northern corn-belt of USA where agricultural drainage has been linked to excessive nitrogen loading to the Mississippi River, growing more perennial grasses has been proposed for bio-fuel production. This paper presents a simulation study on the hydrological effects on subsurface drainage of substituting perennial grasses for com/soybean rotation in southern Minnesota. Long-term simulation with DRAINMOD based on 90 year weather records showed that higher consumptive uses of water by grasses may significantly reduce subsurface drainage discharge, especially in the years following prolonged dry period. The bio-drainage effect of grasses on drainage reduction is much more significant than engineering measures such as reducing drainage intensity by reducing drain depth or increasing drain spacing. Growing deep rooted perennial grasses may significantly reduce negative impact of subsurface drainage discharge on aquatic environment of the study area.