关键词: 校园绿地, 温度, 相对湿度, 舒适度

Abstract: Four representative types of green space including tree-shrub-herbage semi-natural mixture, tree-shrub-herbage artificial mixture, tree-herbage artificial mixture, and artificial lawn were selected in the campus of Peking University to study the improvement effects of green space on campus microclimate, especially on the human comfort. The air temperature and relative humidity were measured every one hour from 0:00 to 24:00 every day for continuously 32 days during July and August in 2012. The results indicate that all types of green space show significant cooling and humidification effects compared with the concrete floor in hot summer. Among these, the semi-natural forests perform a very important ecological regulatory function. During the observation period, all types of green space improve the human comfort degree to a certain extent, which are ranked in an order of tree-shrub-herbage semi-natural mixture > tree-herbage artificial mixture > tree-shrub-herbage artificial mixture > artificial lawn, but the improvement effect is not as obvious as their cooling and humidification effects. From the perspective of the different times of a day, the comfort improvement of the green space is more obvious early in the morning and late in the evening than that at any other time of a day. As a whole, some parts of the green space in the campus of Peking University don’t give full play to the improvement effects of the campus comfort according to the various functional requirements in summer, which deserves further attention in the campus green space construction.

Key words: campus green space, temperature, relative humidity, comfort index