采用LI-6400型便携式光合仪测定了扬州古运河风光带不同绿地类型气温及空气相对湿度的日变化。在夏季7:30至16:30,乔-草型和灌-草型绿地的气温均随时间推移而上升,最高值出现在12:00,但各时段的气温均低于对照点(园路)。绿地内的空气相对湿度随时间推移呈梯度下降的趋势,但绿地内的空气相对湿度明显高于对照点。研究结果表明,与对照点相比,2种绿地类型均具有明显的降温增湿效应,且乔-草型绿地的降温增湿效应优于灌-草型绿地。此外,乔-草型绿地的垂柳(Salix babylonica L.)林中,距林地中心越远,林地的降温增湿效应越弱。

 Diurnal change of air temperature and relative humidity in different landscape models at scenic belt along the Grand Canalin Yangzhou has been investigated with LI-6400 portable photosynthetic instrument. Air temperature in arbor-grass and shrub-grass type landscapes raises as time goes on from7:30 to 16: 30in summer, and the highest temperature appears at 12: 00, but air temperature in landscapes is obviously lower than that of the control plot(road).Air relative humidity in different landscapes decreased step by step from 7: 30to 16: 30, but air relative humidity in landscapes is obviously higher than that of the control plot. The results indicate that the decreasing temperature and increasing humidity effect of the two landscape models is remarkable better than that of the control plot, and that of arbor-grass type landscape is the best in the two landscapes. Inaddition, the farther the distance to forest land center, the weaker effect of decreasing temperature and increasing humidity in Salix babylonica L. forest of arbor-grass type landscape.