中文摘要：

通过研究氯化钠胁迫下香樟（Cinnamomum camphora）幼苗叶片光合色素和叶绿素荧光参数的变化规律，为香樟耐盐性的研究以及沿海地区的引种栽培提供理论依据。以温室大棚中培育的实生香樟幼苗为实验材料，设置2‰、6‰2种盐梯度（质量浓度），清水为对照（CK），通过测定苗高相对生长量、基径相对生长量以及受胁迫后第7天（初期）、第39天（前期）、第76天（中期）、第120天（后期）幼苗叶片相对含水量、光合色素和荧光参数，研究盐胁迫对香樟光合机构的影响。结果表明，香樟幼苗受胁迫程度随着胁迫时间的延长而加深：6‰的盐浓度能显著抑制香樟生长，严重损害其光合机构；2‰的盐浓度胁迫下，香樟的生长量和光合功能并未受显著影响。胁迫后期．香樟可能由于气温显著降低而进入冬季休眠，耐盐性降低，2‰的盐浓度也影响了其光合机构功能，而此时CK光合功能也有所下降，但仍明显高于2‰的盐浓度处理。

英文摘要：

To provide a theoretical basis for the salt stress research and the introduction to the coastal area of Jiangsu Province for Cinnamomum camphora, the change of leaf photosynthetic pigments and chlorophyll fluores- cence parameters of camphor seedlings under NaC1 stress in different times was studied. Camphor seedlings culti- vated in the greenhouse were treated with 2%0 and 6%0 （mass concentration） NaC1, and water as the control. On the 7th day （ initial stage） , the 39th day （earlier stage ） , the 76th day （medium term） and the 120th day （late period） after NaC1 treatment, the relative high growth and relative base diameter growth before and after the experiment, leaf relative water content, photosynthetic pigment and fluorescence parameters were measured. Results showed that the damage degree became greater with the increase of salt-stress time; the photosynthetic apparatus was damaged se- verely and the growth of camphor was inhibited obviously under the salt stress of 6%0, but it did not be affected sig- nificantly under the salt stress of 2%0; however, in the late period, the ability of salt tolerance of camphor decreased, and the salt stress of 2%0 could also affect its photosynthetic function. Although the photosynthesis of CK also de- creased at that time, but it was still stronger than that of the 2%0 salt treatment, which was probably caused by the dormancy due to a significant decrease of temperature.