CAJ | 학술논문

采用直径为30 cm、高度为50 cm的PVC管进行室外盆栽试验的方式，研究自然环境下2年生胡杨实生幼株高度、叶绿素质量分数等指标在21 d的土壤渐进式干旱后的变化情况。结果表明：在7月的塔里木河下游，在饱和灌溉6 d后，盆栽胡杨幼株试验的土壤0～40 cm平均含水量就从田间持水量下降至轻度干旱胁迫水平，第15 d后下降至重度干旱胁迫水平。土壤干旱显著降低叶片中叶绿素a、叶绿素b质量分数，过氧化物酶活性显著下降，但叶绿素a/b、脯氨酸、丙二醛质量分数及超氧化物歧化酶活性无显著变化。土壤干旱抑制了胡杨幼株高度、基径的增长和侧枝的萌发，相对停灌后期（7～21 d）而言，停灌初期（0～6 d）土壤水分减少对胡杨幼株生长的抑制作用较小。
채용직경위30 cm、고도위50 cm적PVC관진행실외분재시험적방식，연구자연배경하2년생호양실생유주고도、협록소질량분수등지표재21 d적토양점진식간한후적변화정황。결과표명：재7월적탑리목하하유，재포화관개6 d후，분재호양유주시험적토양0～40 cm평균함수량취종전간지수량하강지경도간한협박수평，제15 d후하강지중도간한협박수평。토양간한현저강저협편중협록소a、협록소b질량분수，과양화물매활성현저하강，단협록소a/b、포안산、병이철질량분수급초양화물기화매활성무현저변화。토양간한억제료호양유주고도、기경적증장화측지적맹발，상대정관후기（7～21 d）이언，정관초기（0～6 d）토양수분감소대호양유주생장적억제작용교소。
A pot experiment in the outdoor was conducted to investigate the effect of soil progressive drought on the growth and physiology activities of two-year-old Populus euphratica seedlings in the lower reach of Tarim River.The seedlings were grown under well-watered and progressive water deficit conditions with controlling the water supply, respectively.Height, stem base diameter , chlorophyll a and b, superoxide dismutase activity and other physiological parameters were measured during the experiment .In six days of saturated irrigation ( watered until soil water drainage occurred from the bottom of the pot), the soil moisture content decreased to mild drought stress level, and it reached to severe drought stress level in fif-teen days after saturating irrigation in July in the lower reaches of Tarim River.Water deficit in soil consequently affected physiological activities and growth of seedlings to various extents depending on the level of soil water content .In the process of soil water declining from saturated to severe drought levels, increasing soil drought resulted in decreases in the height, stem base diameter, number of lateral branches, the contents of chlorophyll a, chlorophyll b and peroxidase activi-ty, but there were no significant changes in the content of proline and malondialdehyde , chlorophyll a/b value and SOD activity.