Study on the Concentration characterictics of Negative Air Ions Among Different Planting Modes in Xishuangbanna Rubber Plantation
Negative Air Ion(NAI)concentrations in the air of different planting patterns were continuously ob-served in the germplasm nursery of Yunnan Tropical Crops Research Institute located in Mango Mountain and the eco-friendly ecological rubber plantation built in 2006.The variation characteristics of NAI concentration and its relationship with related influencing factors were analyzed.The results showed that the highest negative air ion concentration was 2980/cm3 in dry season,5474/cm3 and 2208/cm3 in rainy season and fog-cool season,respec-tively.The lowest negative oxygen ion concentration was 1890,2654,1685/cm3 in each season.The concentration of negative air ions in different seasons was rainy season(May-October)>dry season(February-April)>foggy season(November-January of the next year).The air negative ion concentration of different planting patterns was green manure>noni>timber forest>pure forest>germplasm nursery.The change of negative air ion concen-tration was significantly positively correlated with air humidity and air water content,and the correlation coeffi-cients(R)were 0.545 and 0.494,respectively.It was significantly negatively correlated with air relative humidity,and the correlation coefficient(R)was-0.169.
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