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通过测定油菜苗期叶片的光合强度,分析光强、温度、施肥等因素与光合强度的关系,结果表明:(1)油菜苗期不同叶位的光合强度、呼吸强度有较大差异,两者均以植株上最大叶最高;不同品种间光合强度也有明显的差异。(2)油菜叶片的光合强度与光照强度有密切关系,0～20klx范围内,光合强度随着光照强度的增加而提高,其光饱和点约为20～30klx,光补偿点为2.8～4.5klx。(3)油菜叶片光合作用的最适温度为20～25℃,而呼吸作用在30℃时最旺盛。(4)施肥对油菜叶片的光合强度有一定影响,但远小于对叶面积的影响。
The results showed that: (1) The photosynthetic intensity and respiratory intensity at different leaf positions of rapeseed were quite different, both of which All the largest leaves on the plant were the highest; different varieties of photosynthetic intensity also have significant differences. (2) The photosynthetic intensity of rapeseed leaves is closely related to light intensity. Within 0 ~ 20klx range, the photosynthetic intensity increases with the increase of light intensity. The light saturation point is about 20 ~ 30klx and the light compensation point is 2.8 ~ 4.5klx . (3) The optimal temperature for photosynthesis of rape leaves is 20 ~ 25 ℃, while the respiration rate is the most vigorous at 30 ℃. (4) Fertilization had some effect on the photosynthetic intensity of rapeseed leaves, but it was much less than the effect on leaf area.