Effects of salt (NaCl) stress of different concentrations on growth and physiological responses of one year old Tsoongiodendron odorum seedlings were studied in pots containing soil. The results showed that the effects of salt stress on height increment, relative electric conductivity, SOD activity, proline and chlorophyll content of T. odorum seedlings were extremely significant. With the increase of salt concentration, height increment and chlorophyll content decreased,relative electric conductivity increased; SOD activity increased and then decreased, but that was higher than control, and reached the maximum on 0. 2% concentration;proline content decreased and then increased slightly with the increase of salt concentration, but that was lower than control. Analysis of correlation showed that correlation coefficient among salt concentration and height increment, relative electric conductivity, and chlorophyll content all reached over 0. 973,indicating the close relationship between them. However, the relevance among salt concentration and SOD activity, and proline content was not significant.%采用盆栽试验的方法,对1年生观光木幼苗在不同浓度盐分(NaCl)胁迫下所产生的生长和生理反应进行研究.结果表明:盐分胁迫对观光木苗高增量、相对电导率、SOD活性、脯氨酸及叶绿素含量的影响均达极显著水平.随盐浓度的增加,苗高增量、叶绿素含量逐渐下降,而相对电导率不断增大；SOD活性随盐浓度的增加呈先上升后下降的变化趋势,但均大于对照,且在0.2％处达到最大值；脯氨酸含量随盐浓度的增加呈先下降后略有上升的趋势,但均小于对照.相关性分析表明,盐浓度与苗高增量、相对电导率、叶绿素含量的相关系数均达0.973以上,说明它们之间具有密切的关系；而与SOD活性和脯氨酸含量的相关性不显著.
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