中文摘要：

通过盆栽模拟酸雨淋喷实验，比较了浙江省典型经济植物山核桃和杨梅幼苗光合特性的差异，研究了不同强度酸雨胁迫（pH2．5、pH4．0和pH5．6（对照））对其光合生理生态特征的影响。结果表明，在无酸雨条件下，杨梅的最大净光合速率、暗呼吸速率、光饱和点和光补偿点明显高于山核桃。酸雨胁迫下，pH4．0的酸雨胁迫使山核桃的最大净光合速率、光饱和点显著降低，使杨梅的表观量子效率显著升高，而pH2．5的酸雨胁迫使山核桃的最大净光合速率、表观量子效率显著降低，使杨梅的光饱和点显著升高。从季节反应模式来看，酸雨对山核桃光合特性的影响在夏季较春季明显，而对杨梅的影响则春季较夏秋季明显。

英文摘要：

Taking the typical subtropical economic tree species Carya cathayensis and Myrtca rubra in Zhejiang Province as test objects, a pot experiment was conducted to study the photosynthetic characteristics of their seedlings under effects of simulated acid rain with a gradient of pH 2.5, pH 4. 0, and pH 5.6 （CK）. In the maximum net photosynthetic rate （Amax） , dark respiration rate （Rd）, light saturation point （LSP）, and light compensate point （LCP） of M. rubra were obviously higher than those of C. cathayensis under no acid rain condition. Under the effects of pH 4.0 acid rain, the Areax and LSP of C. cathayensis decreased significantly, and the apparent quantum efficiency （AQE） of M. rubra increased significantly; while under the stress of pH 2.5 acid rain, the Areax and AQE of C. cathayensis decreased significantly, and the LSP of M. rubra increased significantly. The effects of acid rain on C. cathayensis were greater in summer than in spring, and those on M. rubra were greater in spring than in summer and autumn.