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苹果、柿子、板栗的年周期与日周期光合强度变化,皆为双峰曲线型。在一年中以春季光合强度为最高,5月底为由高潮转向低潮的转折点;在一天中以上午8点钟左右光合强度最高,而以12～14点为最低。形成双峰曲线的原因显然与温度有关。 柿子的光合能力比苹果强,在一年中始终保持较高的平稳状态。而板栗则由初春到深秋始终保持低水平的平稳状态。 当叶初展尚呈绿黄色时,光合强度特别弱,而呼吸强度特别高,但新叶一旦长成,光合强度上升较快,因而在春季枝条下部叶的光合强度高于上部叶,夏、秋叶渐枯老则与此相反。
Apple, persimmon, chestnut annual cycle and solar cycle photosynthetic intensity changes, are bimodal curve type. In the year, the photosynthetic intensity was the highest in spring and the turning point from climax to low tide at the end of May; the photosynthetic intensity was the highest at about 8 o’clock in the morning and the lowest was 12 ~ 14 o’clock. The reason for the formation of a bimodal curve is obviously temperature dependent. Persimmon’s photosynthetic capacity is stronger than that of apples, maintaining a high steady state throughout the year. The chestnut from early spring to late autumn always maintain a low level of steady state. Photosynthetic intensity was particularly weak and the respiration intensity was particularly high when the leaves were early greenish, but the photosynthetic intensity increased rapidly when the new leaves grew up. Therefore, the photosynthetic intensity of the lower leaves in spring was higher than that in the upper leaves, Fall foliage is always the opposite.