Four important indices of photosynthesis,including net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (E) and intercellular CO2 (Ci) of the three bamboos of Sinobambusa tootsik f.luteolo-albostriata,Bambusa multiplex ‘Alphonse-karr’ and Chimonobambusa neopurpurea were studied by LI-6400 Portable Photosynthesis System and treatments by different concentrations of NaCl (CK-0.0％,S1-0.1％,S2-0.3％,S3-0.5％,S4-0.7％ and S5-1.0％) in order to discuss the effects of NaCl stress on the photosynthesis of bamboos.The results showed that:low concentrations of NaCl stress (0.1％) promoted the Pn,Gs and E of Bambusa multiplex ‘Alphonse-karr’ and Chimonobambusa neopurpurea,but little effect on Sinobambusa tootsik f.luteolo-albo-striata;from 0.3％ NaCl stress to l.0％ NaCl stress,with the increasing of salinity,Pn,Gs and E of all three bamboos were decreased; Ci of all three bamboos was not in good relationship with the increasing of salinity.%采用盆栽试验法,对花叶唐竹(Sinobambusa tootsik f.luteolo-albo-striata)、小琴丝竹(Bambusa multiplex ‘Alphonse-karr’)和刺黑竹(Chimonobambusa neopurpurea)进行不同浓度盐(NaCl)胁迫(CK、0.1％、0.3％、0.5％、0.7％、1.0％)处理,用美国LI-COR公司生产的Ll-6400便携式光合作用分析系统测定其各项光合作用相关指标,分析研究其中重要的4项指标:净光合速率(Pn)、气孔导度(Gs)、胞间二氧化碳浓度(Ci)和蒸腾速率(E),以探究NaCl胁迫对3种竹子叶片光合作用的影响.结果表明:低盐胁迫(0.1％ NaCl处理)提高了小琴丝竹和刺黑竹叶片净光合速率、气孔导度和蒸腾速率,而对花叶唐竹影响不大,但随着盐胁迫浓度的增加,3种竹类植物叶片的净光合速率、气孔导度和蒸腾速率呈逐渐下降的趋势；3种竹类植物胞间二氧化碳浓度随盐胁迫浓度的提高变化规律不明显.
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