ANALYSIS OF DISTRIBUTION CHARACTERISTICS AND INFLUENCING FACTORS OF NEGATIVE OXYGEN ION CONCENTRATION IN NANJIAN COUNTY
Selecting real-time monitoring data of negative oxygen ions from May 2022 to April 2023 and remote sensing satellite data from 2016 to 2019 in Nanjian County,the distribution characteristics and influencing factors of negative oxygen ion concentration at three stations in Nanjian County were analyzed using normalized vegetation index(NDVI)approximation to estimate vegetation coverage and mathematical statistics.The results show that:(1)The concentration of negative oxygen ions in Nanjian County has obvious diurnal variation characteristics,with higher levels during the day than at night.The concentration of negative oxygen ions exceeds the air freshness level 5 standard,which is beneficial for human health.(2)The negative oxygen ion concentration in Nanjian Tulin Park varies greatly in each month,with an average monthly concentration of 2494/cm3;The concentration of negative oxygen ions in Wuliang Medicinal Valley exhibits significant monthly variation characteristics,with the highest value appearing in September at 2960/cm3;The overall concentration of negative oxygen ion concen-tration in Wuliangshan Cherry Blossom Valley is generally high,with an average monthly concentration of 2730/cm3.The concentration of negative oxygen ions in each month throughout the year is greater than 2000/cm3.The concentration of negative oxygen ions in Nanjian is highest in autumn,followed by summer,and slightly higher in winter than in spring.(3)The impact of various meteorological factors on the concentration of negative oxy-gen ions varies.The concentration of negative oxygen ions is positively correlated with temperature and wind speed;There is a negative correlation between daytime and relative humidity,and a positive correlation between nighttime and relative humidity.(4)vegetation coverage is one of the main influencing factors of negative oxy-gen ion concentration.Areas with high vegetation coverage generally have higher negative oxygen ion concentra-tion than areas with low vegetation coverage.Vegetation coverage based on satellites remote sensing can provide more convenient and accurate scientific basis for the site selection of negative oxygen ion stations.The average an-nual concentration of negative oxygen ions in Nanjian is more than 2 300/cm3,which is higher than the basic re-quirements for the concentration of negative oxygen ions in the declaration of"China Natural Oxygen Bar".
negative oxygen ionair qualityecotourismnatural oxygen barNanjian County
NETL
NSTL
万方数据
