CAJ | 학술논문

　　为了探明盐害对紫花苜蓿生长及光合生理特性的影响，为提高植物耐盐性、增加生物学产量、培育耐盐新品种提供科学依据，通过田间试验，以2年生紫花苜蓿‘公农一号’为研究对象，在不同浓度NaCl处理下研究了紫花苜蓿的生理生化响应。结果表明：（1）S1和S2处理组的净光合速率(Pn)、气孔导度(Gs)在胁迫初期小幅上升后开始下降，并随时间的延长趋势变缓，S3处理组则持续下降。（2）各处理组的胞间CO2浓度(Ci)则呈先急剧升高后逐渐下降的趋势。（3）不同浓度处理组蒸腾速率(Tr)均呈下降趋势，后期略有恢复。（4）紫花苜蓿叶片SPAD值和地上部分生物量均随着盐浓度的提高显著降低。研究表明，NaCl胁迫下，紫花苜蓿叶片光合作用受到抑制，进而影响到地上部分生物量。但低盐胁迫后期，苜蓿叶片的光合作用有恢复现象，表现出其具有一定的耐盐性。
　　위료탐명염해대자화목숙생장급광합생리특성적영향，위제고식물내염성、증가생물학산량、배육내염신품충제공과학의거，통과전간시험，이2년생자화목숙‘공농일호’위연구대상，재불동농도NaCl처리하연구료자화목숙적생리생화향응。결과표명：（1）S1화S2처리조적정광합속솔(Pn)、기공도도(Gs)재협박초기소폭상승후개시하강，병수시간적연장추세변완，S3처리조칙지속하강。（2）각처리조적포간CO2농도(Ci)칙정선급극승고후축점하강적추세。（3）불동농도처리조증등속솔(Tr)균정하강추세，후기략유회복。（4）자화목숙협편SPAD치화지상부분생물량균수착염농도적제고현저강저。연구표명，NaCl협박하，자화목숙협편광합작용수도억제，진이영향도지상부분생물량。단저염협박후기，목숙협편적광합작용유회복현상，표현출기구유일정적내염성。
In order to investigate the impact of salt stress on growth and photosynthetic physiological characteristics in alfalfa (Medicago sativa), with the aim of providing scientific foundation for enhancement of plant salt tolerance, biomass and new salt-tolerant plant breeding, the two-year Gongnong No.1 as experimental material, the physiological and biochemical responses under different concentration of NaCl in fields were investigated. The results showed that (1)S1 and S2 of photosynthesis rate (Pn) and stomatal conductance (Gs) had a slight increase only at early period, and then resumed its descent which fluctuatde more slowly with the course of time, while the corresponding index of S3 declined continuously. (2)Intercellular CO2 concentration (Ci) in all treatment groups increased sharply initially and then decrease gradually along with treatment time. (3)Transpiration rate (Tr) in all treatment groups decreased with treatment time and recovered slightly in late treatment. (4)SPAD value and aboveground biomass of alfalfa decreased remarkably with the increasing of salt concentration. Our research showed that the restrained photosynthesis further affected aboveground biomass. At the later stage of low salinity stress, the photosynthesis has recovered. The results indicated that alfalfa has a certain salt-tolerance.