[Objective] The study aimed to discuss the spatial changes of negative air ion concentration in Hefei City. [Method] Based on the observation of air ions, temperature, relative humidity, the spatial changes of negativ...[Objective] The study aimed to discuss the spatial changes of negative air ion concentration in Hefei City. [Method] Based on the observation of air ions, temperature, relative humidity, the spatial changes of negative air ion concentration in different districts of Hefei City were ana- lyzed firstly, then the correlation between negative air ion concentration and meteorological factors was discussed. [ Result] Air cleanliness index （CI） of the parks, residential areas, industrial regions, transport stations and prosperous commercial districts was 0.86, 0.53, 0.37, 0.26 and 0.17 respectively, and the latter two regions suffered mild and moderate pollution separately. Daily variations of negative air ion concentration in the residential areas and parks of Hefei City were obvious, showing U shape, that is, the maximum values appeared in the morning and evening, while the minimum values could be found around 14 ：（30. There was no distinctly regular variation of negative air ion concentration in the prosperous com- mercial districts, transport stations and industrial areas. In Hefei City, the concentration of negative air ions showed an increasing trend from the ur- ban districts to the suburban districts; it was obviously higher in the residential areas and parks with numerous plants and waters compared with the prosperous commercial districts and transport stations. Negative air ion concentration correlated with relative humidity positively and temperature negatively, so the main meteorological factors influencing the negative air ion concentration in Hefei City were temperature and relative humidity. [ Coedusloa] The research could provide scientific references for city planning and greenbelt construction in future.展开更多
【目的】对香山公园典型植被生态环境效应相关影响因子分析评价,以期为游客选择香山公园最佳游览时间及公园绿地管理和景观设置提供理论依据。【方法】夏季连续10天在北京香山公园5处不同植物类型的游憩点进行测定,选择园外广场为对照,...【目的】对香山公园典型植被生态环境效应相关影响因子分析评价,以期为游客选择香山公园最佳游览时间及公园绿地管理和景观设置提供理论依据。【方法】夏季连续10天在北京香山公园5处不同植物类型的游憩点进行测定,选择园外广场为对照,分析6处监测点微气候、PM_(10)和PM_(2.5)浓度、人体舒适度、空气负离子浓度及噪音情况,研究各因子日变化规律,并统计比较不同游憩点间差异和各生态因子间的相关性。【结果】香山公园日空气温度和空气相对湿度呈单峰型变化,平均降低空气温度1.7℃,增加空气相对湿度6%;人体舒适度达到Ⅱ级标准的时间最长可达8.5 h;PM_(10)和PM_(2.5)浓度均呈早晚高、午后低的双峰型变化特征,各游憩点对PM_(2.5)日均净化率达27.6%,对PM_(10)日均净化率达25.9%,2种颗粒物浓度间呈极显著正相关(P<0.01),2种颗粒物浓度与温度、湿度分别呈显著负相关(P<0.05)和极显著正相关(P<0.01);负离子浓度呈波峰波谷交替变化,早、中、晚出现3个高峰,园内日均值为795个·cm^(-3),为园外的2.43倍,与PM_(10)和PM_(2.5)浓度极显著负相关(P<0.01),与温度显著负相关(P<0.05)、与湿度极显著正相关(P<0.01),通过空气离子评价指数得出各游憩点均在6:00前后和20:00—21:00达到了轻度或中度污染;噪音呈现出早晚2个高峰,园内噪音平均值为40.3 d B,平均降噪率达21.8%,与植物郁闭度显著负相关(P<0.05);植物郁闭度与负离子浓度极显著正相关(P<0.01),与PM_(10)和PM_(2.5)质量浓度极显著负相关(P<0.01)。【结论】香山公园绿地内不同植被类型间增湿、降温、抗污染、降噪等能力存在差别,黄栌混交林的生态效应最高,草坪最低;香山公园夏季合理的游憩时段为7:00—11:00和17:00—20:00。展开更多
基金Supported by Key Scientific and Technological Program of Anhui Province (10010302001)
文摘[Objective] The study aimed to discuss the spatial changes of negative air ion concentration in Hefei City. [Method] Based on the observation of air ions, temperature, relative humidity, the spatial changes of negative air ion concentration in different districts of Hefei City were ana- lyzed firstly, then the correlation between negative air ion concentration and meteorological factors was discussed. [ Result] Air cleanliness index （CI） of the parks, residential areas, industrial regions, transport stations and prosperous commercial districts was 0.86, 0.53, 0.37, 0.26 and 0.17 respectively, and the latter two regions suffered mild and moderate pollution separately. Daily variations of negative air ion concentration in the residential areas and parks of Hefei City were obvious, showing U shape, that is, the maximum values appeared in the morning and evening, while the minimum values could be found around 14 ：（30. There was no distinctly regular variation of negative air ion concentration in the prosperous com- mercial districts, transport stations and industrial areas. In Hefei City, the concentration of negative air ions showed an increasing trend from the ur- ban districts to the suburban districts; it was obviously higher in the residential areas and parks with numerous plants and waters compared with the prosperous commercial districts and transport stations. Negative air ion concentration correlated with relative humidity positively and temperature negatively, so the main meteorological factors influencing the negative air ion concentration in Hefei City were temperature and relative humidity. [ Coedusloa] The research could provide scientific references for city planning and greenbelt construction in future.
文摘【目的】对香山公园典型植被生态环境效应相关影响因子分析评价,以期为游客选择香山公园最佳游览时间及公园绿地管理和景观设置提供理论依据。【方法】夏季连续10天在北京香山公园5处不同植物类型的游憩点进行测定,选择园外广场为对照,分析6处监测点微气候、PM_(10)和PM_(2.5)浓度、人体舒适度、空气负离子浓度及噪音情况,研究各因子日变化规律,并统计比较不同游憩点间差异和各生态因子间的相关性。【结果】香山公园日空气温度和空气相对湿度呈单峰型变化,平均降低空气温度1.7℃,增加空气相对湿度6%;人体舒适度达到Ⅱ级标准的时间最长可达8.5 h;PM_(10)和PM_(2.5)浓度均呈早晚高、午后低的双峰型变化特征,各游憩点对PM_(2.5)日均净化率达27.6%,对PM_(10)日均净化率达25.9%,2种颗粒物浓度间呈极显著正相关(P<0.01),2种颗粒物浓度与温度、湿度分别呈显著负相关(P<0.05)和极显著正相关(P<0.01);负离子浓度呈波峰波谷交替变化,早、中、晚出现3个高峰,园内日均值为795个·cm^(-3),为园外的2.43倍,与PM_(10)和PM_(2.5)浓度极显著负相关(P<0.01),与温度显著负相关(P<0.05)、与湿度极显著正相关(P<0.01),通过空气离子评价指数得出各游憩点均在6:00前后和20:00—21:00达到了轻度或中度污染;噪音呈现出早晚2个高峰,园内噪音平均值为40.3 d B,平均降噪率达21.8%,与植物郁闭度显著负相关(P<0.05);植物郁闭度与负离子浓度极显著正相关(P<0.01),与PM_(10)和PM_(2.5)质量浓度极显著负相关(P<0.01)。【结论】香山公园绿地内不同植被类型间增湿、降温、抗污染、降噪等能力存在差别,黄栌混交林的生态效应最高,草坪最低;香山公园夏季合理的游憩时段为7:00—11:00和17:00—20:00。
