A STUDY OF THE FUNCTION OF URBAN GREEN SPACE FOR FIXING CARBON

(1)植被重建树种叶片气孔分布对Setouch地区22种植被重建树种叶片气孔分布进行了调查。结果表明，所有被调查树种的叶片都只有背面有气孔，正面没有气孔。研究表明，鹅掌楸、榉树等植物的气孔分布随土壤水分条件的变化而变化，而银杉、山海棠等植物的气孔分布不随土壤水分条件的变化而变化。这一结果反映了不同树种间的特征差异，说明利用气孔分布来判断土壤水分状况是可能的。(2)在香川大学、锦渊森林公园和马鲁加梅站Sq对鹅掌楸的光合速率和蒸腾速率进行了测定 关于我们 UARE 2年。成熟叶片光饱和光合速率在5 ~ 9月均在15 μ mol CO_2/m^2/sec左右，但在夏季干旱期明显下降。马鲁加梅车站广场的树木种植在地下停车场上方的人工地面上，并在树木周围铺上沥青，因此预计不会有地下水供应和雨水渗入土壤。这种条件容易引起土壤干旱，使马鲁加梅车站广场的树木表现出较低的光合速率和蒸腾速率，经常倒伏。指出了人工地面种植存在的问题之一. (3)香樟的光合和蒸腾特性在香川大学、栗林公园和坂出绿色带连续3年测定了香樟的光合速率和蒸腾速率。成熟叶片光饱和光合速率6 ~ 9月为12 ~ 16 μ mol CO_2/m^2/sec，冬季为夏季的1/3 ~ 1/2，夏季干旱期光合速率下降，土壤紧实、根系发育不良的树木，其光合速率下降幅度较大，在12-16 μ molCO_2/m^2/sec可作为樟树健康评价的有效指标。少

(1) Distribution of stmata of leaves of the trees used for revegetationDistribution of stomata of leaves of 22 species trees used for revegetation in Setouch (Inland See) region was investigation. As a result, all of the tree species investigated has stomata only on the back side of the leaves and none on the front side. It is recognized that some species such as Liriodendron tulipifera and Zelkova serrata changed the distribution of stomata with soil water conditions, on the other hand, some species such as Raphiorepis nnbellata and Pitosporum tobira didn't change the distribution of stomata. This results indicate the difference of the caracteristics of tree species, and it is possible to estimate the soil water condition by the distribution of stomata.(2) Characteristics of the photosynthesis and transpiration of Liriodendron tulipiferaPhotosynthetic rate and transpiration rate of Liriodendron tulipifera were measured in Kagawa University, Kinbuchi Forest Park and Marugame Station Sq … More uare for 2years. Light-saturated photosynthetic rate of the mature leaves showed sround 15 micro-mol CO_2/m^2/sec from May to September, but it dropped down greatly in the drought period of Summer. The tree in Marugame Station Square was planted on the artificial ground above the underground parking and paved with asphalt around the trees, so it is not expected the supply of ground water and infiltration of rain into the soil. This conditions is apt to rise soil drought, so that The tree in Marugame Station Square showed lower photosynthetic rate and transpiration rate and frequently drop down. It is pointed out that one of the problem of the planting on the artificial ground.(3) Characteristics of the photosynthesis and transpiration of Cinnamomum CamphoraPhotosynthetic rate and transpiration rate of Cinnamomum Camphra were measured in Kagawa University, Ritsurin Park and Sakaide Green Belt for 3 years. Light-saturated photosynthetic rate of the mature leaves showed 12 - 16 micro-mol CO_2/m^2/sec from June to Septamber and in winter they showed 1/3 - 1/2 of the level in summer, but in the drought period of summer the photosynthetiv rate dropped down, and the tree that has a poor root system because of compacted soil conditions showed greatly drop down.The photosynthetic rate of 12-16 micro-molCO_2/m^2/sec can be used as an available index for health estimation of Cinnamomum Camphora. Less