Spatio-temporal variations, influential factors and environmental health assessment of negative air ions (NAIs) in Hainan tropical rainforests
XU Rui-yun1, GONG Dao-cheng1,2, MENG Xin-xin3, LIN You-jing3, LI Zhu4, CHEN Si-jun1, CHEN Xi1, CHANG Qing-hua1, LIANG Ye1, WANG Lei1, LIU Shi-wei1, MA Fang-yuan1, LI Qin-qin1,2, ZHANG Cheng-liang1,2, DENG Shuo1,2, WANG Hao1,2, WANG Bo-guang1,2
1. College of Environment and Climate, Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; 2. Guangdong Provincial Observation and Research Station for Atmospheric Environment and Carbon Neutrality in Nanling Forests, Guangzhou 511443, China; 3. Hainan Ecological Environmental Monitoring Center, Haikou 571126, China; 4. Wuzhishan Ecological Environment Monitoring Station, Wuzhishan 572299, China
Abstract：To investigate the spatio-temporal variations, influential factors and environmental health effects of negative air ions (NAIs) in Hainan tropical rainforests, a mobile comprehensive measurement platform was utilized to carry out field observation during typical tourist season (January), four types of typical forest stands (evergreen broad-leaved, deciduous broad-leaved, coniferous and bamboo forests) at eleven different altitudes in the Wuzhishan area of the Hainan Tropical Rainforest National Park were measured. The concentrations, spatiotemporal variations of NAIs, and their relationships with forest types, meteorological factors, air quality, and volatile organic compounds (VOCs) were analyzed. A comprehensive evaluation method for the ecological health function of tropical rainforest based on the Forest Health Index (FHI) was established. The results showed that the NAI concentration in the Wuzhishan area was relatively high (3541±882)moles/cm3, reaching Level VI of the World Health Organization's air freshness classification standard. The NAI concentration was increased with altitude initially and then decreased. Coniferous forest was found to have the highest NAI concentration, followed by broad-leaved forest, with bamboo forest having the lowest. A total of 66VOCs were detected, with sesquiterpenes and oxygenated organic compounds accounting for over 80%. NAIs were shown significant positive correlations with relative humidity, fine particulate matter, and monoterpenes, and significant negative correlations with sesquiterpenes and aromatic hydrocarbons. The FHI in the afternoon was generally found to be higher than that in the morning, with most sampling sites reaching Level II or above.
徐芮韵, 龚道程, 孟鑫鑫, 林尤静, 李珠, 陈思君, 陈曦, 常清华, 梁叶, 王磊, 刘世伟, 马方园, 李勤勤, 张成亮, 邓硕, 王好, 王伯光. 海南热带雨林空气负离子的时空变化规律、影响因素及环境健康评估[J]. 中国环境科学, 2025, 45(2): 657-670.
XU Rui-yun, GONG Dao-cheng, MENG Xin-xin, LIN You-jing, LI Zhu, CHEN Si-jun, CHEN Xi, CHANG Qing-hua, LIANG Ye, WANG Lei, LIU Shi-wei, MA Fang-yuan, LI Qin-qin, ZHANG Cheng-liang, DENG Shuo, WANG Hao, WANG Bo-guang. Spatio-temporal variations, influential factors and environmental health assessment of negative air ions (NAIs) in Hainan tropical rainforests. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 657-670.
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