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以来自6个种源花楸树1年生幼苗为材料,通过观测苗木田间生长表现、叶片相对电导率、光合特性等生理指标并利用隶属函数综合评价不同种源花楸树对夏季高温环境的适应性,为早期筛选出适应低海拔地区的优良种源奠定理论基础。结果表明:不同种源对高温的适应性表现不同。山东崂山种源的苗高年增长量最大,为34.99 cm,而河北雾灵山种源的地径年增长量最大(6.90 mm);河北驼粱山种源的净光合速率和蒸腾速率最高,分别为12.1μmol CO2·m-2·s-1和6.28μmol H2O·m-2·s-1,而山西庞泉沟种源净光合速率和蒸腾速率最低,分别为8.03μmol CO2·m-2·s-1和4.39μmol H2O·m-2·s-1。山西庞泉沟种源叶片受伤害程度最大,叶伤害指数为46.53%;受伤害最小的是山东泰山种源,叶伤害指数为17.75%。综合评价表明,越夏能力最强的是山东泰山和山东崂山种源,河北种源次之,山西种源最差。
The annual seedlings of Catalpa bungei from six provenances were used as materials to observe the growth performance of seedlings in field, the relative conductivity and photosynthetic characteristics of leaves, and the membership functions were used to evaluate the adaptation of different provenances of Catalpa bungei to summer high temperature environment Which laid the theoretical foundation for early screening of excellent provenances suitable for low altitude areas. The results showed that the adaptability of different provenances to high temperature differed. The annual increase of Laoshan provenance in Shandong Province was 34.99 cm, while that of Wuling Mountain in Hebei Province was the largest (6.90 mm). The net photosynthetic rate and transpiration rate of Camellia oleifera in Hebei Province were the highest 12.1 μmol · m-2 · s-1 and 6.28 μmol · H2O · m-2 · s-1, respectively, while the net photosynthetic rate and transpiration rate of the provenances in Pangquangou of Shanxi Province were the lowest, which were 8.03μmolCO 2 · m-2 · s-1 and 4.39 μmol H2O · m-2 · s-1. Shanxi Pangquangou seed germination leaves the greatest degree of injury, leaf injury index was 46.53%; the least affected by the Shandong Taishan provenance, leaf injury index was 17.75%. Comprehensive evaluation shows that the strongest in summer is Shandong Mount Laoshan and Shandong provenance, followed by provenance in Hebei, Shanxi provenance the worst.