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对木兰科5属11种,即光观木、红花木莲、香木莲、长梗木莲、峨眉含笑、阔瓣含笑、云南拟单、厚朴、亮叶含笑、黄心夜合、白玉兰的主要光合生理指标进行了对比研究。结果表明,11个树种在净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)、水分利用率(WUE)之间的差异明显。相关性分析发现,Gs与Pn、Ci、Tr都存在显著正相关,Ci与WUE呈显著负相关。经测定分析,不同树种、不同冠层叶片的光合生理指标不同,总的趋势是树冠上部>树冠中部>树冠下部。根据所测主要光合生理指标将11个树种进行模糊聚类,可分为两类第一类是高净光合速率、高水分利用率组,包括香木莲、长梗木莲、云南拟单、黄心夜合;第二类是低净光合速率、低水分利用率组,包括观光木、红花木莲、峨眉含笑、阔瓣含笑、厚朴、亮叶含笑、白玉兰。两类植物在主要光合生理指标上有明显差异,生产应用上宜首选第一类木兰科植物。
Magnoliaceae 5 genera and 11 species, namely, Guanggu wood, safflower Manglietia, fragrant wood lotus, long stem Magnolia, Emei smile, lobular smile, plan to Yunnan, Magnolia, bright leaves smile, yellow heart night white, white Magnolia major photosynthetic physiological indicators were compared. The results showed that there were significant differences in net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and water use efficiency (WUE) Correlation analysis showed that there was a significant positive correlation between Gs and Pn, Ci, Tr, and Ci was negatively correlated with WUE. The results showed that the photosynthetic indexes of different tree species and different canopy leaves were different. The general trend was the top of canopy> the middle of canopy> the lower part of canopy. According to the measured photosynthetic physiological indicators of the 11 species of fuzzy clustering can be divided into two categories The first category is a high net photosynthetic rate, high water use efficiency group, including fragrant wood, long stems lotus, Yunnan to be single, yellow The second category is low net photosynthetic rate, low water use efficiency group, including sightseeing wood, safflower, Emei smile, lobular smile, Magnolia, bright leaves smile, Magnolia. Two kinds of plants in the main photosynthetic physiological indicators have significant differences in production applications should be preferred first class Magnoliaceae plants.