【摘要】 对新培育的金科系列的4个杨树无性系(3#、6#、8#、9#)的光合特征及净光合速率、水分利用效率与主要影响因子的关系进行了研究。结果表明:不同月份4个无性系的净光合速率的日进程一般在10:00左右达到峰值,然后逐渐降低;蒸腾速率日进程不尽一致;气孔导度在7:00~9:00出现峰值后,缓慢下降。在6~8月,4个无性系的净光合速率的总平均值(μmol CO2.m-2.s-1)排序为:无性系9#(8.53)>6#>(7.21)3#(6.47)>8#(4.98);蒸腾速率的总平均值(mmolH2O.m-2.s-1)排序为:无性系9#(3.74)>3#(2.76)>6#(1.76)>8#(1.47);水分利用效率的总平均值(mmol CO2.mol-1H2O)排序为:无性系8#(4.77)>6#(4.35)>3#(2.99)>9#(2.40)。4个无性系的净光合速率与水分利用效率的排序并不一致。9#属于高光合、高蒸腾、低水分利用效率类型,8#属低光合、低蒸腾、高水分利用效率类型。在6月份6#无性系的净光合速率和水分利用效率与温度、湿度显著相关,3#、8#、9#无性系与光合有效辐射和气孔导度密切相关。更多还原

【Abstract】 The photosynthetic characteristics and the relationship of net photosynthetic rate,water use efficiency with the environmental factors and stomatal conductance in four new poplar clones（3^#、6^#、8^#、9^#） were studied.The results showed that the peak value of the diurnal courses of the photosynthetic rate generally appeared around 10:00,and then reduced gradually.The diurnal courses of transpiration rate in different months were different.The peak value of the diurnal courses of stomatal conductance generally appeared at 7:00⁹:00.The total mean net photosynthetic rate(μmol CO₂·m^-2·s^-1),transpiration rate(mmol H₂O·m^-2·s^-1) and water use efficiency(mmol CO₂·mol^-1 H₂O) had following order in June,July and August respectively: Clone 9^#（8.53）>6^#（7.21）>3^#（6.47）>8^#（4.98）;Clone 9^#（3.74）>3^#（2.76）>6^#（1.76）>8^#（1.47）;Clone 8^#（4.77）>6^#（4.35）>3^#（2.99）>9^#（2.40）.Clone 9^# had higher net photosynthetic rate and transpiration rate,with lower water use efficiency.On the contrary,clone 8^# had lower net photosynthetic rate and transpiration rate,with higher water use efficiency.Net photosynthetic rate and water use efficiency had a close relationship with the air temperature and relative humidity in 6^#,and had a close relationship with the photosynthetic active radiation and stomatal conductance in 3^#、8^# and 9^#.更多还原