庐山鹅掌楸(Liriodendron chinense)幼苗蒸腾特性研究

THE CHARACTERISTICS OF TRANSPIRATION IN LEAVES OF LIRIODENDRON CHINENSE SEEDLINGS IN LUSHAN

摘要:

庐山山地上的鹅掌揪幼苗，在夏季晴天土壤供水充足的条件下，其叶片蒸腾速率的日变化为午后高峰型，日蒸腾量为70．92molH2Om-2d-1，最大蒸腾速率达3.9mmolH2Om-21s-1,叶／气温度差、气孔导度、相对湿度等因素对蒸腾速率的影响最显著；鹅掌揪幼苗的水分利用率日平均为4．142mmolCO2mol-1H2o，最高可达11.8mmolCO2mo1-1H2O。

Abstract:

The characteristics of transpiration in leaves of Liriodendron chinense seedlings measured by a CI-30lPS Portable Photosynthesis System showed that the highest transpiration rate in soil withsufficient water appeared in the afternoon of sunny summer. The leaf/air temperature difference,stomatal conductance, reactive humidity and other factors markedly affected the transpiration rate.The daily average water use effidency of L. chinense sablings was 4.142 mmol CO2 mol-1 H2O.