Winner William E, Mooney Harold A
Department of Biological Sciences, Stanford University, 94305, Stanford, CA, USA.
Oecologia. 1979 Jan;44(3):290-295. doi: 10.1007/BF00545230.
A unique gas exchange system is described in which photosynthesis, transpiration, and stomatal conductance can be measured on leaves during SO fumigations. SO concentrations can be continuously monitored and manipulated between 0 and 2.0 ppm. Rates of total SO uptake and SO absorption through stomates of a fumigated leaf can also be determined.Using this system we compared the effects of SO on the gas exchange rates of two shrub species that co-occur in the Califormian chaparral. Diplacus aurantiacus, a deciduous shrub, was more sensitive to SO fumigation than Heteromeles arbutifolia, an evergreen shrub. The differences in photosynthetic sensitivity could be attributed, in large part, to differential SO absorption rates.
本文描述了一种独特的气体交换系统，通过该系统可在对叶片进行二氧化硫熏蒸期间测量光合作用、蒸腾作用和气孔导度。二氧化硫浓度可在0至2.0 ppm之间进行连续监测和控制。还可测定熏蒸叶片对二氧化硫的总吸收速率以及通过气孔的吸收速率。利用该系统，我们比较了二氧化硫对两种共生在加利福尼亚州丛林中的灌木物种气体交换速率的影响。落叶灌木双色金鱼草比常绿灌木山楂叶悬钩子对二氧化硫熏蒸更为敏感。光合敏感性的差异在很大程度上可归因于二氧化硫吸收速率的不同。
