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测量了林下与全光下地枫皮的叶片形态和光合-光响应曲线,探讨光强对地枫皮的形态和生理特性的影响。结果表明:林下与全光下地枫皮叶片净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和水分利用效率(WUE)对光强的响应趋势均基本一致,但全光下的Pn、Gs和Tr值较高,林下WUE值较高。全光下地枫皮的最大净光合速率、光饱和点和光补偿点均极显著高于林下,但弱光下的量子效率无显著差异;林下地枫皮的叶长、叶宽、干物质重、叶面积和比叶面积等叶片形态参数均极显著大于全光。推断地枫皮为耐阴性较弱的阳生植物,其光合能力和光饱和点较低,是对干旱环境的适应性反应;全光下地枫皮叶片狭小降低了吸光面积,有利于避免过高光强对叶光合器官的损伤。
The leaf morphology and photosynthesis - light response curve of the undergrowth and total light shading undergrowth were measured, and the effects of light intensity on the morphological and physiological characteristics of the Chinese maple. The results showed that the photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) and water use efficiency (WUE) Under light, the Pn, Gs and Tr values were higher, and the WUE under the forest was higher. The maximum net photosynthetic rate, light saturation point and light compensation point of Maple bark under all light were significantly higher than those under undergrowth, but the quantum efficiency was not significantly different under low light. The leaf length, leaf width and dry matter weight , Leaf area and specific leaf area and other leaf morphological parameters were significantly greater than the total light. Inferred to Mapera as negative-tolerant weaker plants, its photosynthetic capacity and light saturation point is low, is the adaptive response to arid environment; all-light maple leaves narrow light absorption area, help to avoid excessive light intensity on Leaf photosynthetic organ damage.