Negative air ion Atmospheric movements 1 Camellia japonica 1 China 1 Electron transport properties 1 Electron transport rate 1 Environment factor 1 Indicator indicator 1 Ions 1 Japonica 1 Leaf area 1 Machine learning 1 Multiple linear regression 1 Negative air ion (NAI) 1 Open top chambers 1 Photosynthesis 1 Photosynthetic electron transport 1 Plants (botany) 1 Random forest model 1 Sap flow 1 Sap flow measurements 1 Stomatal conductance 1 Transpiration 1 Transpiration rates 1 Transport properties 1 air temperature 1 algorithm 1 concentration (composition) 1 condition factor 1 detection method 1