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以15年生油栗（CastaneamollissimaCV.youli）为试验材料，对田间条件下板粟光合作用变化规律进行了研究，结果表明：板栗光合作用的年周期变化出现两个峰值，前期随着叶片的迅速生长，光合强度加强，7月达最高峰值19.13mgCO2dm-2h-1，9月以后迅速降低.日周期变化表现为两个高峰，第一个峰值出现于上午8：00～10：见点间，以后逐渐下降，下午16：00～18：00出现第二个高峰.光强影响叶片光合速率及其形态结构;光照强度高，叶片厚，光合能力强.
The 15-year-old oil chestnut (Castaneamollissima CV.youli) was used as experimental material to study the photosynthetic changes of millet under field conditions. The results showed that there were two peaks in the annual cycle of chestnut photosynthesis. With the rapid growth of leaves, Photosynthetic intensity increased in July reached its peak 19.13mgCO2dm-2h -19,9 after the late bottom of the job. Daily cycle showed two peaks, the first peak appeared in the morning 8: 00 ~ 10: see the point, then gradually And the second peak appeared from 16: 00-18: 00. Light intensity affected leaf photosynthetic rate and its morphological structure; high light intensity, thick leaves and strong photosynthetic ability.