不同杨树品系光合作用的研究

对13个杨树品系1 a生苗木的净光合速率、蒸腾速率进行测试与分析,结果表明:不同品系的净光合速率差异较大,杂1号、杂2号、A5-13、A5-17的净光合速率较对照大青杨分别高出15.07%、17.15%、5.25%和11.52%。长势较好的6个品系和对照的净光合速率日变化明显,杂1号、杂2号、A5-17、自选1号和对照呈现双峰曲线,峰值出现在10:00时和14:00时;A5-13、辉南5号呈现单峰曲线,峰值出现在14:00时。6个品系蒸腾速率的日变化基本相同,在11:00~13:00时达到最大值,之后迅速下降;同对照比较,A5-13、A5-17、杂1号、杂2号为高光合、高蒸腾类型,辉南5号为高光合、低蒸腾类型,自选1号为低光合、匀速蒸腾类型。在光合有效辐射为0~800μmol.m-2.s-1范围内,6个品系的净光合速率随着光合有效辐射的增加而增强,基本呈正相关;在光合有效辐射为1 500μmol.m-2.s-1左右时,达到光饱和点。

Studies on photosynthesis of different poplar strains

A study was conducted to determine the net photosynthetic rate and transpiration rate of 1-year-old seedlings of 13 different poplar strains in the nursery of Tonghua City,Jilin,China.Results show that there are significant differences in net photosynthetic rate between different poplar stains.The net photosynthetic rates of Hybrid 1,Hybrid 2,A5-13,and A5-17 are 15.07%,17.15%,5.25%,and 11.52% higher than that of Populus ussuriensis,respectively.The six well growing stains,Hybrid 1,Hybrid 2,A5-17,Optional(se...