摘要
青山杨(Poplars pseudo-cathayana×P.deltodides)是抗性良好的速生杂交杨,文章对其在盐碱胁迫下一个生长期内的光合生理特性进行了研究。结果表明,盐碱地和对照地上的青山杨在整个生长期内,净光合速率日变化都先后呈"双峰"、"单峰"和"平缓"型曲线。5～7月是青山杨全年光合作用最旺盛的时期,盐碱地青山杨日最大净光合速率为13.20μmol.m-2.s-1,对照地为14.53μmol.m-2.s-1,同比下降了9.15%。盐碱地和对照地蒸腾速率的日变化都呈"单峰"曲线,一年内5～7月蒸腾速率逐渐升高,7月15日达最大值后逐渐下降,在13:00左右蒸腾速率最大。盐碱地与对照地的气孔导度变化都呈双峰曲线,与光合速率变化相一致。盐碱地与对照地胞间CO2浓度与光合速率呈负相关。
Qingshan poplar（Poplars pseudo-cathayana×P.Deltodides） was a poplar variety with salt resistance ability,its photosynthetic and correlated physiological characteristics were investigated in this study.The results showed that diurnal variation curves of net photosynthesis rate exhibited a bimodal peak,a unimodal peak and gentle pattern during the whole growing periods in saline-alkali stress soil and control condition.From May to July,Qingshan poplar had the largest net photosynthesis rate（13.20 μmol.m-2.s-1） in saline-alkali soil and control（14.53 μmol.m-2.s-1）,and fell by 9.15%.The daily change of leaf transpiration rate was summarized as the single peak curve,which was increased from May to July,reached the peak at 13： 00 apparently on July 15th and began to decrease.In the saline-alkali and control soil changes of stomatal conductance also showed the double-peak curve and accordanced with the photosynthetic rate changes.Intercellular CO2 concentration and photosynthetic rate of the saline-alkali and control have a negative correlation.
出处
《东北农业大学学报》
CAS
CSCD
北大核心
2010年第2期31-38,共8页
Journal of Northeast Agricultural University
基金
国家"十一五"科技支撑项目资助(2006BAD03A0306)
关键词
青山杨
光合特性
盐碱胁迫
Poplars pseudo-cathayana ×P.deltodides
photosynthetic characteristic
saline-alkali stress
作者简介
作者简介：闫永庆（1966-），男，副教授，博士研究生，研究方向为植物逆境生理及园林植物应用。
通讯作者：祖元刚，教授，博士生导师，研究方向为森林植被恢复，改善、增加效益功能的森林植被生态服务研究。E-mail：zygorl@vip．hl．cn
