【摘要】 在自然条件下,通过增加不同强度的UV-B辐射,对攀援植物栝楼叶片光合速率日变化和水分利用效率进行了研究,发现经增加R1强度UV-B辐射处理(3.0 μw·cm-2)的栝楼净光合速率扣水分利用效率比对照上升了4.04％和40.48％,蒸腾速率则下降了25.94％,而经增加R2强度UV-B辐射处理(8.0 μw·cm-2)的栝楼净光合速率和水分利用效率比对照上升了22.47％和53.44％,蒸腾速率则下降了20.18％。这表明,在该试验的UV-B辐射强度下,栝楼的光合作用随UV-B辐射增强而增强,水分利用效率也随之提高。说明适当增加UV-B辐射对栝楼的生长有利。更多还原

【Abstract】 Under natural conditions, the plants of Trichosanthes kirilowii Maxim were exposed to different intensities of ultraviolet - B (UV-B) radiation and the diurnal variations in their photosynthetic rate and water use efficiency (WUE) were recorded. Compared to the control group, the photosynthetic rate and WUE increased by 4. 04% and 40. 48% , respectively, in plants subjected to R1 dose UV-B radiation (3. 0 μw/cm) and by 22. 47% and 53. 44% in plants subjected to R2 dose UV-B radiation (8.0 μw/cm), while their transpiration rate dropped by 25. 94% and 20. 18% , respectively, in Treatments R1 and R2. Such results indicated that within the range of UV-B radiation intensity used in this study, photosynthesis of T. kirilowii Maxim increased with UV-B radiation intensity, and that reasonable enhancement of UV-B was beneficial to the growth of this plant.更多还原