雾培法根际CO2 对马铃薯生长和光合作用的影响

 通过汽雾栽培方式对马铃薯根际连续35 d 的CO₂ 处理表明: 温室大气处理(CO₂ 380～920μL·L ^{- 1} + O₂ 21 %) 和室外大气处理(CO₂ 380μL·L ^{- 1} + O₂ 21 %) 马铃薯植株的形态特征非常接近, 其株高、叶面积、根系质量、匍匐茎数量、块茎产量以及生物量均比根际高CO₂ 处理(CO₂ 3600μL·L ^{- 1} + O₂ 21 %) 明显提高, 叶片的气孔导度和胞间CO₂ 浓度增加, 光呼吸速率与CO₂ 补偿点降低, 叶片光系统Ⅱ功能改善,光合速率提高, 植株生长发育旺盛, 块茎产量增加, 说明合适的根际CO₂ 浓度(CO₂ 380～920μL·L ^{- 1} + O₂ 21 %) 可能是汽雾栽培马铃薯植株生长旺盛的重要原因。

Effects of CO2 Treatment of Root Zone on Potato Growth and Photosynthesis by Areoponics Culture

The root systems of potato plants ( Solanum tuberosum L. ) ‘Favorita’treated with different CO₂concentrations by areoponics culture for 35 days showed an increase in plant height , leaf area , root mass , stole number , tuber mass and overall plant fresh mass for the greenhouse gas treatment (CO₂ 380 - 920μL·L ^{- 1} + O₂21 %) and outdoor air treatment (CO₂ 380μL·L ^{- 1} + O₂ 21 %) , compared with a high CO₂ concentration treatment (CO₂ 3600 μL·L ^{- 1} + O₂ 21 %) . In addition , there was an increase in stomatal conductance (G_s) of leaf ,intercellular CO₂ concentration (C_i), net hotosynthetic rate ( P_n) and photochemical efficiency ( F_v/ F_m) of leaf , at same time there was an decrease in CO₂ compensation point (Γ) , photo respiratory rate (Rp) and carboxylation efficicency (CE) for the formers. The results indicated that the appropriate CO₂ concentration (CO₂380 - 920μL·L ^{- 1} + O₂ 21 %) in the root zone may be an important reason why the areoponics culture may advance the growth and the development of potato plant .