上海沿海防护林空气负离子水平测定

空气负离子被誉为“空气维生素”，是衡量空气质量的重要指标。为了探讨城市防护林改善人居环境的效应，选择上海南汇地区的沿海防护林作为研究对象，对空气负离子水平进行了分析测定。结果表明，不同土地利用方式、林分内不同空间空气负离子分布呈现显著差异；负离子水平随林分树种不同而变化。不同土地利用方式下负离子浓度表现为：林地〉小区〉...

on Air Negative Ions of Coastal Shelter Forest in Shanghai

Air negative ions as an important index measuring air quality, is called air vitamin. In order to approach the effect of shelter forest on human habitat environment, air negative ions of the coastal shelter forest were investigated in Shanghai. The result indicated that the level of air negative ions changed with land use types, spatial location and different stands. The density of air negative ions at 10 m off the shelter belt was 603/m^3, 13/cm^3 and 61/cm^3 more than that at off 30 m and 50 m, respectively. The density on ground surface was the highest appeared 2 298/cm^3. Zhongshan fir（Ascendens mucronatum） forest and Glossy privet （Ligustrum lucidum） forest had higher density than the other forests, reached 5 667/cm^3 and 2 048/cm^3 respectively. And the density of air negative ions was different among various land use systems, i.e. forest 〉 community 〉 park 〉 village 〉 farmland.