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[目的]探讨北热带岩溶区主要树种苹婆幼树的光合蒸腾特性。[方法]利用1年生苹婆实生苗,经盆栽和控水试验,研究其净光合速率、蒸腾速率、气孔导度、胞间CO2浓度、水分利用效率等的变化。[结果]长期干旱胁迫和正常供水的苹婆幼树,其净光合速率、蒸腾速率、气孔导度、水分利用效率有极显著差异,干旱胁迫将导致净光合速率、蒸腾速率和气孔导度显著降低,而水分利用效率有所提高。[结论]苹婆属于光合速率、蒸腾速率和水分利用效率较低的树种。
[Objective] The research aimed to study the photosynthetic and transpiration characteristics of sambucus sativa, a major tree species in the North Tropic karst region. [Method] The changes of net photosynthetic rate, transpiration rate, stomatal conductance, intercellular CO2 concentration and water use efficiency of one-year-old Coptis chinensis seedlings were studied through pot experiment and water control experiment. [Result] The net photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency of young apple tree under long-term drought stress and normal water supply were significantly different. Under drought stress, the net photosynthetic rate, transpiration rate and stomatal conductance were significant Reduce, and water use efficiency has increased. [Conclusion] Pheasant was a tree species with lower photosynthetic rate, transpiration rate and lower water use efficiency.