以南京地区城市森林区林外定点气象观测站和市区国家气象观测站同期（1988年1月至2002年12月）的4个气候要素（降水量、蒸发量、空气湿度、空气温度）记录值为依据，对两测站各要素值的年际变化趋势及气候反常（定量化）两方面进行对比研究，分析小气候对中气候波动的响应程度。结果显示：（1）两测站相同气候要素间的年际变化趋势吻合率平均达90 %以上；（2）两测站各要素的月、季、年值中均出现过“反常”，其中达“异常”程度的概率未超过“反常”总数的15 %。在实际气候反常事件中，林区站比市区站单一要素“反常”的概率多26 %，但在3和4个要素“反常”方面少约30 %。因此，可以认为城市森林对气候反常有协调的生态功能。

This paper used four climatic elements:precipitation, evaporation, air humidity, air temperature etc data measured at two meteorological observing stations(an urban site and an open site of the ecologically station) from 1988 to 2002 in Nanjing and the climatologically standard normals in Nanjing(1960—1990).Four elements were analyzer by their yeartoyear trends and the climatic abnormalities (rations)at two stations. The results showed that:(1)the average coincident rate of yeartoyear trend was 90 % or more between the same elements at the two stations.(2)every elements had occurred “abnormality” all (including “extreme” level that it does not exceed 15 % of the “abnormality”).In reality, “abnormality” ratio of a single element in the forest site was more 26 %,but the sum of three and four elements were lees 30 %,in comparison with the urban site. It follows that the urban forest has mitigated function when the climate arises the anomalous fluctuates.