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本文测定了不同地点的长白落叶松种源的光合、水分生理生态参数．结果表明，各种源的总光合速率＞最大净光合速率＞净光合速率＞半饱和光强时的净光合速率＞光呼吸速率＞呼吸速率，只偶有例外．各参数在种源间的变化趋势均与净光合速率一致，总光合速率变异最大，光呼吸速率、光补偿点、饱和点和半饱和点的变异较大，呼吸速率、净光合速率占总光合速率的百分比、呼吸功效、ＣＯ２补偿点、蒸腾速率和水势变异不大．水分利用率在各种源间的较大变异主要是由净光合速率引起
In this paper, the photosynthetic and water ecophysiological parameters of Larix olgensis provenances in different locations were determined. The results showed that the total photosynthetic rate> net photosynthetic rate> net photosynthetic rate> net photosynthetic rate> photosynthetic respiration rate> respiration rate of all kinds of sources, with some exceptions. The trend of all the parameters varied with the net photosynthetic rate and the variation of total photosynthetic rate was the largest. The variation of photorespiration rate, light compensation point, saturation point and half-saturation point were larger, and the respiration rate and net photosynthetic rate accounted for the total photosynthesis The percentage of speed, respiratory efficiency, CO2 compensation point, transpiration rate and water potential did not vary significantly. The large variation in water use efficiency among various sources is mainly caused by the net photosynthetic rate