【摘要】 采用L i-6200光合分析仪,在自然条件下对柠条叶片蒸腾速率的日进程进行了观测。结果表明:在夏季晴天条件下,柠条叶片蒸腾速率的日变化呈单峰曲线,峰值出现在13:00~15:00时,约为9.392μmolH2O.m-2.s-1。采用一元线性回归分析和逐步多元回归分析的方法,建立了柠条叶片蒸腾速率与大气温度、叶片温度、水汽压、水汽压亏缺等生理、生态因子间的回归方程。逐步多元回归分析结果表明,其蒸腾速率与水汽压和胞间CO2浓度的回归方程为:TRAN=0.563EAIR-0.004 91C INT+1.824(R2=0.998)。更多还原

【Abstract】 Diurnal variations of transpiration rate in leaves of Caragana microphylla were studied under natural conditions by using Li-6200 photosynthesis analyzer.The results indicated that in the typical summer sunny days,the curve of diurnal variation of transpiration rate was onepeaked,and the peak value appeared at 13:00 to 15:00,whic was about 9.392 μmolH₂O·m^-2·s^-1.Using the method of regression analysis,the correlations between transpiration rate and environmental factors were assessed. The regression equation between transpiration rate,water vapor pressure and intercellular CO₂ concentration was TRAN=0.563EAIR-0.004 91CINT+1.824（R²=0.998）.更多还原