不同土壤水分含量对生菜生长和光合特性的影响

Effects of Different Field Water Capacities on Growth and Photosynthesis of Lettuce

以2个散叶生菜品种（弘农和绿领）为材料,研究了不同田间持水量处理（85%~100%、70%~85%、55%~70%、40%~55%）对生菜生长和光合特性的影响。结果表明,田间持水量为85%~100%处理条件下生菜全株鲜重、叶片含水率、叶面积、叶片数均最高。对光合指标和叶绿素荧光参数分析表明,随着土壤水分含量的降低,两个品种生菜叶片Evap、GS、Pn、Ci、Fv/Fm、ΦPSⅡ、q P均逐渐降低,q N则随着土壤水分含量的降低而升高。

The effects of different field water capacities （85 % - 100 %, 70 % - 85 % and 55 % -70 %, 40 % -55 % ） on the growth and physiological characteristics of lettuce（ Hong Nong and lv Ling） were investigated. The results showed that, in field capacity 85 % - 100 % processing conditions ,the plant fresh weight , leaf water content, leaf area and leaf number were the highest. By photosynthesis and chlorophyll fluorescence parameters analysis, with the loss of the soil moisture content, Evap, GS, Pn, Ci, Fv/Fm,φPSⅡ, qP of the two varieties d lettuce leaf gradually reduced and qN was increased with soil water content reduced.