通过对长春市30种园林树木的光合速率、蒸腾速率、单株叶面积指数进行测定与计算,研究了单位叶面积和单株单位土地面积上的固碳释氧量与增湿降温量.结果表明,30种园林树木单位叶面积的固碳量在12.78～43.74 g/(m2·d)之间,释氧量在9.29～31.81g/(m2·d)之间,增湿量在2.08～6.32 kg/(m2·d)之间,日降温量为0.40～1.22℃；单株单位土地面积的固碳量在62.18～443.82 g/(m2·d)之间,释氧量在45.20～322.82 g/(m2·d)之间,增湿量在12.52～55.74 kg/(m2·d)之间,日降温量为2.42～10.76℃；说明单株单位土地面积更能准确地反映出树木的固碳释氧与增湿降温能力.乔木类与灌木类之间的平均单位叶面积的固碳释氧量与增湿降温量差异不大,而在单位土地面积的日均固碳释氧量与增湿降温量比较上,乔木类是灌木类的1.3倍.%Using 30 species of landscape trees in Changchun city as material, their photosynthetic rate, transpiration rate and leaf area index determination,the carbon fixation, oxygen release, humidity increase and temperature reduction per unit leaf area and per unit land area was studied. The results showed that for the 30 species of landscape trees, the carbon fixation, oxygen release, humidity increase and cooling rate per unit leaf area was 12.78-43.74 g/(mz-d), 9.29~31.81 g/(rn2-d), 2,08-6.32 kg/(m2-d), 0.40-1.22^ respectively. The carbon fixation, oxygen release, humidity increase and cooling rate per unit land area was 62.18-443.82 g/(m2-d), 45.20-322.82 g/(m2-d), 12.52-55.74 kg/(m2-d), 2.42-10.76 °C respectively, which could reflect their capacity more accurately. The difference between arbor and shrub in average carbon fixation and oxygen release, humidity increase and temperature reduction per unit leaf area was not significant. But the four indexes per unit land area of the arbor were 1.3 times as large as the shrub.
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