南京城市森林的空气湿度特征

Characteristics of air humidity in urban forest in Nanjing

通过比对研究16 a的南京市远郊森林区林外定位观测的日空气相对湿度与市区观测的资料,证实城市森林区域空气湿度的年进程及月均值异常等主要遵循当地大气候的韵律。林区旷地的多年年均空气湿度值比市区大2.2,空气湿度差值主要出现在日间高温低湿期,进一步凸显了城市森林对邻近空间的补湿作用。

This paper used daily relative humidity data measured at two meteorological observing stations （an urban site and an open site in the urban forest） during the period of 16 years. The results showed that the annual course and abnormal phenomena of air humidity （i. e. RH） etc. in the urban forest area obeyed the local macroclimate law. The annual mean of the RH in the urban forest site was 2.2 more than that in urban site. The RH difference between two site was distinct, when the RH was minimum at daytime. The urban forest played an important role in supplemental air moisture near the adjacent space.