摘要： 为寻求烤烟幼苗假植期的合理水氮配比。研究了不同土壤相对含水量和施氮量2个因素耦合对烤烟幼苗叶片净光合速率和生物量的影响,在土壤相对含水量为25%和50%时,增施氮肥相对提高了烤烟幼苗叶片的净光合速率和生物量的积累,但在土壤相对含水量达75%时,不同施氮量处理之间烤烟幼苗叶片的净光合速率和生物量之间无明显差异。水分和施氮量对烤烟幼苗叶片净光合速率和植株生物量均是正相关关系,并且土壤相对含水量对烤烟幼苗叶片净光合速率和植株生物量的正效应大于氮肥。土壤相对含水量和施氮对烤烟幼苗叶片净光合速率和植株生长量的影响均存在最适值。本试验条件下,土壤相对含水量约为53%,而施氮量约为0.49 g/kg为假植期烤烟幼苗的最适水氮管理模式,此时烤烟幼苗叶片的净光合速率达8.9769μmol/(m²·s),生物量达0.8946 g。

关键词: 烤烟, 水氮耦合, 回归模型, 净光合速率

Abstract: In order to determine the reasonable ratio of water and nitrogen in the provisonal planting period of tobacco seedlings.The effects of growth and photosynthesis in leaves of tobacco seedlings was studied under water and nitrogen coupling treatment, when the relative water content of soil is 25% and 50%, the net photosynthetic rate and biomass increased with the increase of nitrogen fertilizer increased, but the relative water content of soil reached 75%, the net photosynthetic rate and biomass were both no difference under different nitrogen fertilizer application.Both of water and nitrogen fertilizer on net photosynthetic rate and biomass were positive correlation, two factors on the effects of net photosynthetic rate and biomass order for soil relative water content > nitrogen fertilizer, and two factors have the most suitable range.By comprehensive analysis suggesting that maintained the soil relative water content at 53%, application nitrogen fertilizer amount 0.49 g/kg could be recommended as the best combination of water and nitrogen in this experimental condition, while that the net photosynthetic rate and biomass reached 8.976 9 μmol/(m²·s) and 0.894 6 g, respectively.

Key words: Flue-cured tobacco, Water and nitrogen coupling, Regression method, Net photosynthetic rate

中图分类号: 

• S147.21