Norby R J, Kozlowski T T
Department of Forestry, University of Wisconsin, 53706, Madison, Wisconsin, USA.
Oecologia. 1982 Apr;53(1):34-39. doi: 10.1007/BF00377133.
Stomata of paper birch (Betula papyrifera Marsh.) seedlings were more open at high humidity than at low humidity and responded rapidly to changes in vapor pressure deficit. SO at 0.2 or 0.8 μl l caused partial stomatal closure. Seedlings fumigated with SO at 0.2 or 0.5 μl l for 30 h or 0.2 μl l for 75 h took up more SO at high than at low humidity. Differences in pollutant uptake could be explained by stomatal conductance with no need to invoke changes in mesophyll conductance. Betula seedlings were more sensitive to SO when fumigated at high humidity, as manifested in more leaf necrosis, increased leaf abscission, and greater growth inhibition compared to seedlings fumigated at low humidity. Amount of injury to leaves increased with rate of SO uptake, and inhibition of root growth increased with total SO uptake.
纸皮桦（Betula papyrifera Marsh.）幼苗的气孔在高湿度下比在低湿度下张开得更大，并且对蒸汽压亏缺的变化反应迅速。因此，0.2或0.8 μl l的二氧化硫会导致气孔部分关闭。用0.2或0.5 μl l的二氧化硫熏蒸30小时或用0.2 μl l的二氧化硫熏蒸75小时的幼苗，在高湿度下比在低湿度下吸收更多的二氧化硫。污染物吸收的差异可以用气孔导度来解释，而无需考虑叶肉导度的变化。与在低湿度下熏蒸的幼苗相比，在高湿度下熏蒸的桦树幼苗对二氧化硫更敏感，表现为更多的叶片坏死、落叶增加和更大的生长抑制。叶片的损伤程度随二氧化硫吸收速率的增加而增加，根系生长的抑制随二氧化硫总吸收量的增加而增加。
