中文摘要：

森林小气候监测对于评价森林对全球气候变化的响应与反馈有重要意义。选取2010年鼎湖山针阔叶混交林通量塔林内气象资料及其附近气象站空旷地同时段内气象资料，对两站点的气温、湿度、地温等小气候因子的日变化及月变化进行分析和对比。结果表明：（1）混交林年均气温、大气相对湿度和地表温度分别为19．8℃、86．5％、20℃，空旷地分别为22．1oC、79．1％、24℃。混交林内年均气温与地温分别比空旷地低2．3℃、4℃，年均相对湿度比空旷地高7．4％，土壤各层湿度明显高于空旷地，表现出良好的降温、增湿、涵养水源的小气候效应。（2）二者气温、大气湿度、土壤温度的差值均为白天大于晚上，在10：00-17：00差异明显，表明针阔叶混交林的降温和增湿作用白天大于夜晚。气温和土壤温度差值在湿季大于干季，而相对湿度差值在干季大于湿季，表明针阔叶混交林的降温作用湿季大于干季，增湿作用干季大于湿季。这种小气候调节作用是由南亚热带特殊的气候条件及植被类型决定的。

英文摘要：

Forest microclimate monitoring is of great importance in evaluating the responses and feedbacks of forest to global climate change. One-year meteorological data in 2010, namely tem- poral patterns of air temperature, relative humidity, soil temperature and soil moisture at two sites from a mixed coniferous and broadleaf forest and an open land without forest in the Dinghushan Biosphere Reserve were analyzed and compared. The results showed that the annual average air temperature, relative humidity, soil temperature in the mixed forest were 19.8 ℃, 86.5%, and 20 ℃, respectively, while those in the open land were 22.1 ℃, 79.1% , and 24 ℃ , respective- ly. Soil volumetric water content was significantly higher in the mixed forest, suggesting a cool- ing, humidifying and water-conserving function of this forest. Differences in air temperature, rel- ative humidity and soil temperature during the daytime （10：00-17：00） between the two sites were much higher than that at nighttime, supporting the above assertion of better cooling and hu- midifying functions of the mixed forest at daytime. Differences in monthly air and soil temperature between the two sites were higher during the rainy season than in dry season, while the difference in monthly relative humidity was more apparent in dry season, indicating better cooling effects in rainy season and better humidifying effects in dry season. The pattern of microclimate in the mixed forest was controlled by local climate and vegetation type in lower subtropical China.