2006•Unpublished venueRequires access
A comparison of photosynthethetic characteristics in four poplar clones
Song Deng, Chen Jian
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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 7:00~9:00.The total mean net photosynthetic rate(μmol CO_2·m~(-2)·s~(-1)),transpiration rate(mmol H_2O·m~(-2)·s~(-1)) and water use efficiency(mmol CO_2·mol~(-1) H_2O) 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~#.