淹水胁迫对浙江种源鹅掌楸光合特征的影响  

Effects of Different Water Stress on Photosynthetic Characters of Liriodendron chinense from Zhejiang Province

作　　者：张晓平[1] 王沁峰[1] 方炎明[2] 张敏[2] 

机构地区：[1]安徽师范大学生命科学学院,安徽芜湖241000 [2]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2007年第3期136-138,共3页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：江苏省"九五"农业科技攻关项目(BE96350);安徽师范大学博士启动基金

摘　　要：不同淹水时间处理下,浙江种源鹅掌楸叶片光合特征的变化为:淹水处理2 h后,鹅掌楸叶片的气孔导度、净光合速率、蒸腾速率略有增加;淹水24 h后,叶片的气孔导度、净光合速率、蒸腾速率则大幅度下降;淹水处理48 h后,3个指标达到最低值,与对照相比,降幅均在80%以上。这表明淹水时间越长,胁迫对鹅掌楸光合作用和蒸腾作用的抑制作用越严重。而胞间CO2浓度变化不同:淹水24 h前下降;淹水48 h后则大幅度增加。相关分析结果表明,净光合速率与气孔导度、蒸腾速率与气孔导度均呈显著正相关关系。The effect on photosynthetic characters of Liriodendron chinense from Zhejiang province under different waterlogging time stress was studied. After 2 h waterlogging treatment, the stomata conductance, the net photosynthetic rate （Pn） and the transpiration rate increased a little, but decreased markedly after 24 h waterlogging treatment, and decreased to the least after 48 h waterlogging treatment. The results showed that the longer the stress time, the more serious the restraint to photosynthesis and the transpiration. But the different results occurred for intercellular CO2 concentration （increased obviously after 48 h waterlogging treatment）. The coefficient analysis indicated that, between Pn and the stomata conductance, between the transpiration rate and the stomata conductance, there was an obvious positive correlation.

关 键 词：鹅掌楸 淹水胁迫 光合特征 

分 类 号：S718.43[农业科学—林学] Q945.6[生物学—植物学]