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对混交林中白榆、刺槐及纯林白榆的光合速率、蒸腾强度、叶组织含水量等生理指标的测定结果表明：白榆和刺槐在低光照下都有较高的光合速率，表现出对弱光有着较强的适应性；混交林中白榆的平均光合速率比纯林中白榆高出８个百分点，表明混交林中白榆比纯林能更多地积累干物质。混交林中白榆叶片的自然含水量高于纯林，说明其水分平衡状态较好。
The results showed that the photosynthetic rate, transpiration intensity and leaf water content of Ulmus pumila, Robinia pseudoacacia and Pure Forest elm in mixed forest had higher photosynthetic rate under low light, showing weak to weak Light had a strong adaptability. The average photosynthetic rate of elm in mixed forest was 8 percentage points higher than that of pure elm in pure forest, indicating that P. elmium could accumulate more dry matter than pure forest in mixed forest. The natural water content of Ulmus pumila leaves in mixed forest was higher than that of pure forest, indicating that its water balance was good.