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对８年生密植板栗园“九家种”品种叶片净光合速率及其与生理、生态因子的相关关系进行了系统研究。结果表明：（１）板栗净光合速率（Ｐｎ）一般为４～２０ｍｇ·ｄｍ－２·ｈ－１明显低于苹果、梨等果树；（２）Ｐｎ的日变化规律在生长初期和生长末期为单峰曲线，而在生长盛期（６～８月）为双峰曲线；（３）Ｐｎ的年变化进程也表现为双峰曲线，其高峰分别出现在开花期及果实速生期，Ｐｎ的年变化规律与叶绿素含量、矿质元素（Ｎ、Ｋ）含量的年变化趋势相一致，而与蒸腾强度的关系则较复杂；（４）叶片Ｐｎ直接受光合有效辐射（ＰＡＲ）的制约，同时还受气温和空气相对湿度的影响。
The net photosynthetic rate and its relationship with physiological and ecological factors in 8-year-old chestnut orchards “nine species” were systematically studied. The results showed that: (1) The net photosynthetic rate (Pn) of chestnut was 4 ~ 20mg · dm-2 · h-1, which was significantly lower than that of apples and pears. (2) The daily variation of Pn in the early and late growth stages was (3) Pn’s annual variation process also showed bimodal curve, the peak appeared in flowering and fruit fast-growing period, Pn year The change law is consistent with the annual variation trend of chlorophyll content and mineral element (N, K) content, while the relationship with the transpiration intensity is more complicated. (4) The leaf Pn is directly controlled by photosynthetic active radiation (PAR) Effect of air temperature and relative humidity.