作　　者： ;

机构地区： 怀化师范高等专科学校

出　　处： 《绵阳农专学报》 1995年第2期20-25,共6页

摘　　要： 两烤烟品种NC82和K326在伸根期、旺长期和成熟期分别以不同的土壤含水量进行处理。结果表明：干旱和淹水使茎高、叶面积生长速率降优；水分过多、过少均使净光合速率（Pn）下降，Pn／P总（总光合速率）、Pr（光呼吸）／P总下降，Dr（暗呼吸）／P总和蒸腾系数则增加。适宜于烤烟伸根、旺长和成熟初期生长和光合作用的土壤相对持水量分别为60％、80％和70％。 Drought and waterlogging make flue-cured tobacco NC82 and K326 a lowered growth rate of stem height and leaf area. Excessive soil moisture is benefical to the growth of leaf area and stem height.Water stress causes reduction of Pn and the ratio of Pn/Pt, Pr/Pt,but produces an increase in transpiration coefficient and Dr/Pt.Stomatal limiting caused by lightly water s tress and no-stomatal limiting caused by serious water stress are thc causes of Pn reduction.During roots elongation, rapidly development and ripening phase to respectively manage the soil moisture as much as 60%, 80% and 70% are benefical to the photosynthesis and the harmonious growth of stem and leaves.

关 键 词： 烤烟 土壤相对持水量 生长 光合作用

领　　域： [农业科学] [农业科学]