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对干旱季节田间板栗净光合日变化特征及主要影响因子的研究结果表明，在阴天， 板栗净光合日变化呈单峰型， 中午的光强、叶温和叶水势均处于较适宜状态，净光合达到最大值， 而晴天的净光合日变化呈双峰型， 上午１０∶００～１１∶００ 达最大值， 在中午， 随着光强、叶温增高， 叶水势降低， 净光合急剧下降， １５∶００ 左右降至低谷， 为第１ 峰值的４０％ ～５０％ 。在下午， 光强、叶温和叶水势等因子有所改善，光合在１７∶００～１８∶００ 达第２ 个峰值。高光强、高叶温和低叶水势是导致光合午休的主要原因。栗园浇水并保持５５％ ～８５％ 土壤相对含水量能有效改善植株环境条件， 提高光能利用。
The results showed that the diurnal variation of net photosynthetic rate of chestnut chestnut showed a single peak at cloudy days, and the light intensity at noon, leaf temperature and leaf water potential were all in a more suitable state. Net photosynthesis Reaching the maximum, while the net photosynthetic diurnal variation of sunny days showed a bimodal pattern, reaching the maximum at 10:00 to 11:00 in the morning. At noon, with the increase of light intensity and leaf temperature, the leaf water potential decreased and the net photosynthesis decreased sharply. 15 : 00 down to the trough, the first peak of 40% to 50%. In the afternoon, factors such as light intensity, leaf temperature and leaf water potential improved, and photosynthesis reached the second peak at 17:00 ~ 18:00. High light intensity, high leaves and low leaf water potential is the main reason leading to photosynthesis lunch. Chestnut watering and maintaining 55% ~ 85% soil relative water content can effectively improve plant environmental conditions and improve the utilization of light energy.