【摘要】 以黄瓜为试材,珍珠岩为基质,在连栋温室内研究了不同基质粒径配比对黄瓜生长、产量、光合气体交换参数、荧光动力学参数及PSⅡ光能分配情况的影响。结果表明,纯小粒径(小于2 mm)珍珠岩T9处理的物理性质最理想,T9处理黄瓜生长势和根系适应性最好,产量最高。T9处理黄瓜叶片P_n、G_s和T_r均最大,T9处理黄瓜叶片的F_v/F_m、ΦPSⅡ和q_P均比T1处理显著提高,而Fo和NPQ比T1处理显著降低,这显著提高了PSⅡ反应中心开放程度和PSⅡ电子传递效率。T9处理叶片吸收的光能向P(光化学反应)的分配占比最大,而T1处理叶片吸收的光能向P的分配占比降低,向E(反应中心耗散能)的分配占比增加。综上所述,在封闭式槽培栽培条件下,以纯小粒径珍珠岩作为栽培基质,黄瓜生长势和根系适应性最好,黄瓜叶片的碳同化效率和光合能力最强,产量最高。更多还原

【Abstract】 Cucumber was used as test material and perlite was used as substrate in this research,the effects of different diameter ratios of substrate particle on the cucumber growth and yield,photosynthetic gas exchange parameters,fluorescence kinetics and t PS Ⅱ light energy distribution were investigated in the greenhouse. The physical properties of pure small-size perlite T9 were found the best,the growth potential and root adaptability of cucumber T9 were the best,and the yield was the highest. Under the T9 particle substrate treatment, the P_n,G_s and T_r of cucumber leaves were all maximized,F_v/F_m,ΦPSⅡ and q_P were increased significantly,Foand NPQ were dropped significantly,the PSⅡ reaction center open degree and PSⅡ electron transfer efficiency were extremely promoted. The leaf absorption of light energy to P allocation proportion of T9 was the largest,while the leaf absorption of light energy to the distribution of P was decreased under T1 treatment,which added to the distribution of E. It was concluded that under the pure small-size perlite culture condition,the growth potential and root adaptability of cucumber were the best,the carbon assimilation efficiency and photosynthetic capacity of cucumber leaves were the strongest,and the yield was the highest.更多还原