【摘要】 为探究城市森林空气环境的变化规律，以九峰国家森林公园为研究对象，以空气负离子浓度为主要监测指标，同步监测空气温、湿度，空气颗粒物浓度等，阐明其季节性变化规律，探索影响空气负离子浓度的主要因素。结果表明：森林环境可以显著改善空气温度、湿度，春季和秋季各林分的林内环境均达到“体感舒适”等级；与对照相比，各林分类型对PM_1.0、PM_2.5和PM₁₀有明显净化效果，其中秋季林分净化率高于夏季，春季最低，针叶+常绿阔叶林的颗粒物净化率相对较高；空气负离子浓度总体表现为夏季>春季>秋季，春季和秋季各林分空气负离子浓度的峰值出现时间主要集中在16∶00,夏季则是在10∶00;影响空气负离子浓度的主要因素在不同季节存在差异，各类型颗粒物浓度、天空开阔度在各季节均与负离子浓度呈极显著或显著负相关关系；空气负离子浓度在春季与空气湿度呈显著正相关，在夏季与树高呈显著正相关，在秋季则与空气温度、叶面积指数和树高表现出显著正相关关系。更多还原

【Abstract】 In order to explore the changes of urban forests air environment, Jiufeng National Forest Park in Wuhan City was taken as the research object, and air negative ion concentration was taken as the main monitoring index to simultaneously monitor air temperature, humidity, and air particle concentration, etc.,clarify their seasonal change rules, and explore the main factors affecting air negative ion concentration. The results showed that the forest environment could significantly improve the air temperature and humidity, and the environment of each forest type reached the "body comfortable" grade in spring and autumn. Compared with the control, each forest type had obvious purifying effect on PM₁,PM_2.5 and PM₁₀. The rate of particulate matter clearance in autumn was higher than that in summer, and the lowest was in spring. In each season, the particulate clearance rate of coniferous and evergreen broad-leaved forest was higher. The air negative ions concentration presented that summer >spring>autumn, and the peak time of negative ion concentration in spring and autumn was mainly focused at 16∶00,and it was at 10∶00 in summer. There were seasonal differences in the main factors affecting the air negative ions concentration. The concentration of each particulate type matter and canopy sky openness were extremely significantly or significantly negatively correlated with the negative ions concentration in each season. In addition, the air negative ions concentration was significantly positively correlated with air humidity in spring and with tree height in summer. In autumn, it was positively correlated with air temperature, leaf area index and tree height.更多还原