摘要
通过对3个杨树无性系(JK-7,JK-10,JK-11)气体交换参数及其相应环境因子的测定,对其光合与水分生理生态特征进行了研究。结果表明,3个无性系对同一环境的响应不同。JK-7和JK-11的蒸腾速率(Tr)和净光合速率(Pn)日变化呈单峰型,JK-10呈双峰型;3个无性系的水分利用效率(WUE)日变化均呈双峰型。它们的Pn,Tr差异显著(P<0.05),WUE差异不显著,其中JK-10的Pn,Tr均显著高于JK-7。3个无性系的气体交换受气孔导度(Gs)、光合有效辐射(PAR)的影响均比较大,同时,JK-7受相对湿度(RH)的影响较大,JK-10受气温(Ta)影响也较大。3个无性系的WUE均与Gs显著负相关。
Gas exchange parameters of three new poplar clones （JK-7, JK-10, and JK-11） and the correspond- ing environmental factors were measured in order to explore the relationships of net photosynthetic rate （Pn）, Transpiration rate（Tr）, water use efficiency（WUE）, and the environmental factors such as photosyn- thetically active radiation （PAR）, air temperature（Ta）, vapor pressure deficit（VPD）, and relative humidity （RH）. Results showed that the three clones were different in response to the same environmental factors. The diurnal courses of P,, and Tr displayed single peak curves in JK-7 and JK-11 and a double peak curve, in JK-10, while the diurnal courses of WUE displayed double-peak curves in all clones. There were significant differences in P, and Tr among these elones（P〈0.05）, with the highest in JK-10 and lowest in JK-7, and they were significantly higher in JK-10 than in JK-7. There was no significant difference in WUE among these clones. The P, and T. had close correlations with stomatal conduetance（Gs） and PAR in the three clones, while they had close correlations with RH in JK-7 and To in JK-10. There was significant negative correlation between WUE and G, in the clones.
出处
《水土保持通报》
CSCD
北大核心
2009年第4期88-92,共5页
Bulletin of Soil and Water Conservation
基金
山西省自然科学基金项目(20011079
20031062)
关键词
杨树无性系
蒸腾速率
水分利用效率
净光合速率
环境因子
poplar clone
transpiration rate
water use efficiency
photosynthetic rate
environmental factor
