采用盆栽加盐的方式来人工模拟盐胁迫环境，通过设置0(不加盐)，0.1%，0.3%，0.5%和0.7% 5个盐分梯度，研究NaCl胁迫对桑树幼苗光合作用及其光响应和CO2响应的影响。结果表明：0.1%NaCl对桑树幼苗的光合生理生态特性没有明显影响; 当NaCl浓度≥0.3%时，盐胁迫显著降低桑树幼苗的净光合速率(Pn），气孔导度（Gs）、蒸腾速率（Tr）、水分利用率（WUE）、光能利用效率（SUE）和羧化效率（CUE），增加胞间CO2浓度（CI）。造成桑树幼苗Pn降低的效应是由非气孔因素和气孔因素2者协同作用的结果; 低盐浓度处理时，桑树幼苗Pn降低主要是气孔因素控制的，而高盐浓度处理时，则主要受非气孔因素控制。在光响应和CO2响应过程中，光强和CO2浓度对各种处理的桑树幼苗净光合速率具有显著影响，但其影响的程度和盐浓度密切相关，且盐处理浓度越大，其影响效果越低。此外，盐胁迫能显著降低桑树幼苗的表观量子效率（AQY）、表观羧化效率（ACE）和光饱和点（LSP），增加光补偿点（LCP）、CO2补偿点（CCP）。
Effects of salt stress on photosynthetic characteristics of 1-year-old potted mulberry (Morus alba) seedlings, a common stock of mulberry, were investigated. The seedlings were treated with NaCl concentrations at 0.1%,0.3%,0.5% and 0.7%, fresh water as the control. Using LI-COR 6400 portable photosynthesis system, the net photosynthetic rate (Pn）, stomatal conductance（Gs）, intercellular CO2 concentrations（CI） and transpiration rate（Tr） were measured on 1st,2nd,3rd and 7th day after treatments, and the light response curves and the CO2 response curves of the net photosynthetic rate were measured on 3rd day after treatments. The results showed that 0.1% NaCl did not affects the photosynthetic characteristics of the seedlings, however, while salt concentration≥0.3%, the salinity significantly reduced Pn, Gs, Tr, WUE,SUE and CUE, but enhanced CI. Pn under 0.1% NaCl treatments was a little bigger than that of the control. Under lower salt concentration treatments, Pn decrease was mainly controlled by the stomatal limits, whereas under higher salt concentration treatments, Pn decrease was mainly due to the non-stomatal limits. The net photosynthetic rate under various treatments all gradually increased with PAR or CO2 concentration increasing, however, effects of PAR or CO2 concentration on Pn significantly varied among different NaCl concentration treatments. It was showed that effects of them on Pn decreased with NaCl concentration increasing. In addition, salinity also had an obvious impact on the light compensationpoint（LCP）, light saturation point（LSP）, apparent quantum yield（AQY）, apparent maximum photosynthetic rate（Pmax）, the CO2 compensation point（LCP）and apparent carboxyl efficiency (ACE). In general, Pmax, AQY,LSP, CCP and ACE decreased, but LCP increased with NaCl concentration increasing.
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