以广东黑石顶森林群落为对象，将群落分为４层，其高度分别为２１ｍ，１３ｍ，９ｍ和１．５ｍ，对每层植物种类的叶片光合作用水平及相关因子进行了测定．建立了３个以净光合速率对光合有效辐射和ＣＯ２浓度响应的数学方程式为基础的植物瞬间光合作用模型．不同模型对群落各层的模拟效果不同，模型中的参数反映了群落各层植物对光合有效辐射的不同利用效率，即有第一层＜第二层＜第三层＜第四层．并建立了黑石顶南亚热带群落光合作用模型，利用该群落光合作用模型计算了黑石顶南亚热带常绿阔叶林森林群落的净第一性生产力，每年群落光合作用固定的ＣＯ２为６１．７５ｔ·ｈｍ－２，换算为干物质则为每年３７．０４ｔ·ｈｍ－２．群落净第一性生产力中，群落第一层占８２．０９％，第二层占１０．７７％，第三层占６．２８％，第四层占０．０５％．一年中以６～９这４个月的净第一性生产力最高，而１２、１、２等３个月的净第一性生产力最低 Taking the Heishiding forest community of Guangdong as an example, the community was divided into four layers with 21m, 13m, 9m and 1.5m heights respectively. The leaf photosynthesis level and related factors of each plant species were determined. Three transient photosynthesis models based on mathematical equations of net photosynthetic rate response to photosynthetically active radiation and CO2 concentration were established. Different models have different effects on different layers of the community. The parameters in the model reflect the different utilization efficiencies of photosynthetically active radiation at different layers of the community, that is, the first layer