CAJ | 학술논문

分根交替(PRD)滴灌技术是很有节水潜力的灌水技术.利用再生水,采用分根交替滴灌技术对马铃薯根长密度、根重密度及土壤水盐的空间分布影响进行了研究.结果表明,马铃薯根系主要分布在0～60 cm的土层内,以植株为中心,呈放射状沿不同方向减小.通过研究所建马铃薯根长密度的空间分布函数能较好地反映根系的三维分布趋势.PRD灌溉可以刺激马铃薯根系生长,水分利用效率提高39%.进行PRD灌溉时应重点考虑滴头位置处及垄坡上的水盐变化,最好能起到节水控盐的双重作用.再生水PRD地下滴灌是对传统地表滴灌的优化和提升.
분근교체(PRD)적관기술시흔유절수잠력적관수기술.이용재생수,채용분근교체적관기술대마령서근장밀도、근중밀도급토양수염적공간분포영향진행료연구.결과표명,마령서근계주요분포재0～60 cm적토층내,이식주위중심,정방사상연불동방향감소.통과연구소건마령서근장밀도적공간분포함수능교호지반영근계적삼유분포추세.PRD관개가이자격마령서근계생장,수분이용효솔제고39%.진행PRD관개시응중점고필적두위치처급롱파상적수염변화,최호능기도절수공염적쌍중작용.재생수PRD지하적관시대전통지표적관적우화화제승.
Partial root zone drying (PRD) subsurface drip irrigation is a very potential water-saving technique. The effect of PRD subsurface drip irrigation on spatial distributions of potato root length density(RLD), root weight density(RWD), soil water and soil salt was studied by using reclaimed water. The results showed the soil layer of 0～60 cm was the main root layer of potato, the roots decreased and kept emission in different direction around the plant. The spatial distribution function of potato root length density could simulate the root distribution trend in 3D coordinate. PRD subsurface drip irrigation stimulated potato root growth and root density. Irrigation water use efficiency was increased by 39% under PRD subsurface drip irrigation. Soil water moisture and salt of emitter and middle of ridge slope should be taken into account by PRD irrigation in order to save irrigation water amount and control salinity. Water saving and salinity controlling were the dual-goal in PRD subsurface drip irrigation.