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:以刺槐等 8种沙质海岸主要造林树种盆栽苗为研究对象 ,测试了在水分胁迫下各树种的光合、呼吸和蒸腾速率的变化过程。各树种的光合和蒸腾速率均随土壤含水量的下降 ,通过由慢到快的下降过程 ,而呼吸速率则有一峰值出现。用Logistic方程拟合光合和蒸腾速率变化 ,相关系数均在 0 .97以上 ,达显著水平。通过分析对各树种的耐旱能力进行排序 ,其由强到弱的顺序是 :单叶蔓荆 >火炬树 >黑松 >侧柏 >紫穗槐 >鲁刺 13号 >鲁刺 10号 >火炬松 >绒毛白蜡
: The potted seedlings of eight main afforestation tree species on the sandy coast of China such as Robinia pseudoacacia were studied. The changes of photosynthesis, respiration and transpiration rate under different water stress were tested. The photosynthesis and transpiration rates of all species declined with the decrease of soil water content, and the respiration rate showed a peak through the process of slow to fast descent. Logistic equation fitting photosynthesis and transpiration rate changes, the correlation coefficients were above 0.97, reaching a significant level. By analyzing the drought tolerance of the species to sort, the order from strong to weak is: Vitex negundo> Rhus typhina> Pinus thunbergii> Platycladus orientalis> Amorpha fruticosa> Lu thorn 13> Lu thorn 10> Torch Pine> fluff white wax