广东车八岭国家级自然保护区空气负离子水平及其主要影响因子

Air negative ion concentrations and their affecting factors in Guangdong Chebaling National Nature Reserve

空气负离子(Negative air ion,NAI)是综合反映空气质量的重要指标,对人类的生活环境具有重大意义。该研究选定广东车八岭国家级自然保护区内10个典型观测点,在5月份(夏季)和10月份(秋季)进行NAI观测。结果表明:保护区内NAI浓度较高,均高于700个·cm^(-3);各观测点的NAI浓度基本呈现水体>森林>草坪>楼内的规律;秋季10个观测点的NAI浓度从高到低依次为博物馆旁河中央、漂流起点、小瀑布口、小瀑布支柱、针阔混交林、针叶林、博物馆前草坪、单竹坑、吊桥、办公楼内;观测点漂流起点、小瀑布口、小瀑布支柱、博物馆旁河中央的NAI水平与单竹坑、吊桥、博物馆前草坪、办公楼内、针阔混交林、针叶林均有显著差异。夏季各观测点的NAI浓度从高到低依次为小瀑布口、博物馆旁河中央、小瀑布支柱、漂流起点、针阔混交林、针叶林、单竹坑、博物馆前草坪、吊桥、办公楼内,其中观测点漂流起点、小瀑布口、小瀑布支柱、博物馆旁河中央显著高于其它地点,观测点针阔混交林、针叶林显著高于单竹坑、吊桥、博物馆前草坪、办公楼内,观测点办公楼内显著低于其他点。区内NAI浓度受到季节、水体、植被类型等因子的影响。

The negative air ion (NAl) is one of the most important indicators of air quality, and is of great signifi?cance to human being5 s living environment. The authors selected 10 typical observation sites in Guangdong Chebaling National Nature Reserve and measured the NAl concentrations in summer and autumn. The results showed that NAl concentrations in the reserve was relatively high,with the NAl concentrations at all the observation sites above 700 ionscm 3. The N Al near wraters was the highest,followed by those in forest,lawrn and building in a decreasing se?quence. NAl concentrations in autumn at the ten sites exhibited a decreasing order of river near the museum ( Site10) , starting point of drift (Site 7) , waterfall (Site 8) , waterfall pillar (Site 9) , conifer-broad leaved forest ( Site 5) , coniferous forest ( Site 6) , lawn near the museum ( Site 3) , Danzhu Pit ( Site 1) , suspension bridge ( Site 2) and office (Site 4). There was a significant difference in MAI concentration between sites 7, 8,9, 10 and sites 1, 2, 3 , 4, 5, 6. In summer, the NA! concentrations at the ten sites showed a decreasing order of sites 8, 10, 9, 7, 5, 6, 1, 3 , 2 and 4. MA! at sites 7, 8, 9, 10 was significantly higher than other sites. NA! at sites 5 , 6 was significantly higher than sites 1, 2, 3 , 4. Site 4 was significantly lower than other sites. Season, water and vegetation type were found to influence the MA! concentrations in the reserve.