不同核桃品种的光合特性

摘要

为不同光照条件下铁核桃品种的选择及栽培技术措施的制定提供理论依据,对6个不同核桃品种的光合速率、光响应、蒸腾速率、气孔导度等进行了测定.结果表明:6个核桃品种的Pn日变化、Pn与光强的响应及水分利用率均有较大差异,黔核5号、黔核7号、赫章6号、赫章8号、罗州4号和香玲的光饱和点分别为1490、1475、1490、1478、1460和1272μmolCO2/(m2·s),光补偿点分别为18.3、19.38、18.75、18.51、17.26和16.25μmolCO2/(m2·s).6个核桃品种的喜光性强弱顺序为黔核5号、赫章6号＞赫章8号＞黔核7号＞罗州4号＞香玲,耐阴性强弱顺序为香玲＞罗州4号＞黔核5号＞赫章8号＞赫章6号＞黔核7号；在上午6:00-10:00,黔核7号的水分利用率最大.%The photosynthesis rate (Pn), light response, transpiration rate (Tr) and stomatal conductance (Cond) of six walnut varieties were determined to provide the theoretical basis for selection and cultivation technology of walnut varieties under different light conditions. The results showed that there were obvious differences in Pn diurnal variation, Pn response to light intensity and water use efficiency between six walnut varieties. The light saturation point and light compensation point of Qianhe 5, Qianhe 7, Hezhang 6, Hezhang 8, Luozhou 4 and Xiangling was 1 490, 1 475, 1 490, 1 478, 1 460 and 1 272 μmol CO2/(m2 · S), and 18. 3, 19. 38, 18. 75, 18. 51, 17. 26 and 16. 25 μmol CO2/(m2 · S) respectively. The light-loving order of six tested walnut varieties was Qianhe 5> Hezhang 6> Hezhang 8> Qianhe 7 > Luozhou 4 > Xiangling. The shade tolerance of six tested walnut varieties was Xiangling > Luozhou 4>Qianhe 5>Hezhang 8>Hezhang 6>Qianhe 7. The water use efficiency of Qianhe 7 reached the maximum at 6:00am-10:00 am.