The Study On The Variation Of Air Negative Oxygen Ion Content In Different Forest Parts

In recent years,with the improvement of people's living standards,the progress of science and technology,human's eternal pursuit of health and longevity comes into people's sight again,and Negative Oxygen Ion as "Air Vitamin" has become the environmental factor which is closely related to the human health.Negative Oxygen Ion Concentration in the air can measure the freshness of the air,concern human health,and regulate ecotope.Its irreplaceable important value has become the focus attention increasingly,and attracted the scholars both at home and abroad to explore and research in recent years.This paper is based on the main research of Ping Jiang Forest Park.The research to 9 different plant communities in the park.(oriental white oak,sweetgum,masson pine,azalea,maso bamboo,oriental white oak-masson pine,sweetgum-masson pine,China fir-masson pine,camphor tree-sweetgum)wherein air negative oxygen ion concentration difference date in many aspects,including space-time,humidity,sunshine duration,air temperature,altitude,air speed,tree age is collected and analyzed systematically and comprehensively.We can learn the following conclusions from the analysis of the content of negative oxygen ion in the air in the 9 different plant communities1.Different plant communities produce different negative oxygen ion.2.The daily variation of the content in the air negative oxygen ion in the forest is different in seasons.In summer,it shows a bimodal curve.From 8 am to 10 am,it will reach the peak,and then begin to decline.At About 16:00 o'clock,the content of the air negative oxygen ion will rise to the second peak.While it shows a unimodal curve in other three seasons.3.The annual variation curve of negative oxygen ion in different plant communities is basically consistent,which is the highest in summer,higher in spring and autumn,and lowest in winter.It shows a unimodal curve.In March,it begins to rise gradually,and reaches the peak between July and August,then,it begins to decline slowly and reaches the lowest around February,which finishes a year cycle.4.Under the same climatic conditions and Forest Canopy Conditions,the average number of negative oxygen ion produced by each plant community is China fir-masson pine,oriental white oak-masson pine,masson pine,oriental white oak,camphor tree-sweetgum,sweetgum-masson pine,sweetgum,maso bamboo,Azaleas.5.Under the same climatic conditions and Forest Canopy Conditions,the average number of negative oxygen ion produced by mixed forest(China fir-masson pine,oriental white oak-masson pine)is higher than that of pure forest(masson pine,China fir,oriental white oak);the average number of negative oxygen ion produced by coniferous forest is higher than that of broad-leaved forest.(oriental white oak,sweetgum).6.Under the same or similar site conditions,in spring and autumn,the number of negative oxygen ion in rainy days is bigger than that in sunny days,and the number of negative oxygen ion in sunny days is bigger than that in cloudy days.In summer,the number of negative oxygen ion in rainy days is bigger than that in sunny days,and the number of negative oxygen ion in sunny days is approximately equal to that in cloudy days,in winter the date in rainy days is great than or equal to that in sunny days,and the date in sunny days is bigger than that in cloudy day.The results also show that the negative oxygen ion in the air is correlated with many factors:1.The content of negative oxygen ion in the air is positively correlated with humidity;2.The correlation between air negative oxygen ion content and air temperature changes with the seasons.In summer and autumn,a negative correlation exists between the two seasons;in spring and winter,positive correlation accordingly shows;3.According to the seasons,each stand of the air negative oxygen ion content will affect the degree of meteorological factors are also different:in the spring and summer,the air of negative oxygen ions affected by humidity;in the autumn,the air of negative oxygen ions under common shadow wind and temperature in winter,the negative air ring;oxygen ion content affected by temperature maximum;4.Within the elevation of the observed altitude(100 m to 1200 m),There was no correlation between the content of negative oxygen ion in air and altitude;5.Within certain range of wind speed(1m/s to 11m/s),the negative oxygen ions in the air and the wind speed are positively correlated.But when the wind speed reaches or exceeds llm/s,the negative oxygen ions in the air will be negatively correlated with the wind speed;6.Air negative oxygen ion content and the forest canopy density correlation shows dynamic changes:when the forest canopy density reached 0.3,it begins to gradually improve the air environment and stimulates the generation of negative oxygen ions in the air;when the forest canopy density is between 0.4 and 0.5,it will improve the function of air negative oxygen ion content;when the forest canopy density is between 0.6 and 0.7,the content of negative oxygen ion will grow steadily;when the forest canopy density reaches 0.8 or more,the negative oxygen ion content begins to decrease;7.The relationship between the negative oxygen ion content and slope direction is not obvious.