CAJ | 학술논문

为科学制定饲料桑树幼苗氮肥管理措施，在水培条件下以青龙桑为试验材料，设置4个供氮水平(每株0 mg、7.5 mg、15.0 mg和22.5 mg)，探求不同供氮水平对桑树幼苗生长及生理特性的影响。结果表明，桑树幼苗株高、地径、叶片数量、叶面积、根长、生物量、叶片净光合速率( Pn )、气孔导度( Gs )、水分利用率( WUE)、蒸腾速率( Tr )均随施氮量的增加而呈现先升高后降低的趋势，根冠比随着施氮量的增加逐渐降低，其中每株施15 mg氮处理的桑树幼苗长势最好；此外，桑树幼苗的叶绿素含量、PSII最大光化学量子产量( Fv/Fm )、光化学猝灭系数( qp )、PSII实际光化学效率(ΦPSⅡ)、电子传递速率( ETR)均随施氮量的增加而升高，非光化学猝灭系数( NPQ)随着施氮量的增加而降低。适宜的供氮量可以增强桑树叶绿体光化学活性和光合能力，并且促进桑树的生长，而过高的供氮水平对其促进效应降低。
위과학제정사료상수유묘담비관리조시，재수배조건하이청룡상위시험재료，설치4개공담수평(매주0 mg、7.5 mg、15.0 mg화22.5 mg)，탐구불동공담수평대상수유묘생장급생리특성적영향。결과표명，상수유묘주고、지경、협편수량、협면적、근장、생물량、협편정광합속솔( Pn )、기공도도( Gs )、수분이용솔( WUE)、증등속솔( Tr )균수시담량적증가이정현선승고후강저적추세，근관비수착시담량적증가축점강저，기중매주시15 mg담처리적상수유묘장세최호；차외，상수유묘적협록소함량、PSII최대광화학양자산량( Fv/Fm )、광화학졸멸계수( qp )、PSII실제광화학효솔(ΦPSⅡ)、전자전체속솔( ETR)균수시담량적증가이승고，비광화학졸멸계수( NPQ)수착시담량적증가이강저。괄의적공담량가이증강상수협록체광화학활성화광합능력，병차촉진상수적생장，이과고적공담수평대기촉진효응강저。
The characteristics of growth and leaf photosynthesis of mulberry seedlings were investigated under four nitrogen application rates, 0 mg(CK), 7. 5 mg, 15. 0 mg and 22. 5 mg, respectively. Grow parameters such as plant height, ground diameter, leaf number, leaf area, and root length, biomass, and leaf photosynthetic parameters such as leaf net photosynthetic rate, leaf conductance, water use efficiency, and transpiration rate increased first and decreased after-wards as the nitrogen application levels rose. The leaf chlorophyll content, maximum quantum yield of PSⅡphotochemistry ( Fv/Fm ) , photochemical quenching val-ues ( qp ) , actual photochemistry efficiency of PS Ⅱ(ΦPSⅡ), electron transport rate(ETR) increased as the nitrogen application levels went up while the root shoot ra-tio and non photochemical quenching value ( NPQ ) <br> dropped. The nitrogen level at 15. 0 mg per plant exhibited the best grow-promotive effects on forage mulberry.