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本文测定了鹤山丘陵地豆科阔叶混交林中５种植物（大叶相思、马占相思、绢毛相思、海南红豆和新银合欢）在林地条件下的光合速率、呼吸速率和叶绿素含量以及５种植物光合速率的日变化和季节变化。结果表明：植物在冬季和春季的光合速率较低，夏季和秋季都相对较高。年日平均光合速率（μｍｏｌＣＯ２ｍ－２ｓ－１）绢毛相思最高６．１３，海南红豆最低４．６５；植物的呼吸各异，其中新银合欢的呼吸作用最强，海南红豆最低；叶绿素含量与光合速率不存在相关关系。从国外引种植物（包括新银合欢和３种相思树）的光合速率高于乡土树种海南红豆，表明这几种引种植物适应南亚热带丘陵地区的自然环境。
In this paper, the photosynthetic rate, respiration rate and chlorophyll content of five species (Acacia auriculifolium, Acacia mangium, Acacia mangium, Hainan red bean and Acacia confusa) Diurnal and Seasonal Changes of Photosynthetic Rate in Five Species of Plants. The results showed that the photosynthetic rates of plants in winter and spring were lower than those in summer and autumn. The annual average photosynthetic rate (μmolCO2m-2s-1) was the highest in A. sativum 6.13 and lowest in Hainan red bean 4.65. The respiration of plants was different. The respiration of Acacia neophriclus was the strongest and the content of Hainan red beans was the lowest. There is no correlation between photosynthetic rate. The photosynthetic rate of native species introduced from abroad (including Acacia and Acacia confusa) was higher than that of native species of Hainan red bean, indicating that these introduced species adapt to the natural environment in the subtropical hilly region.