- Subduction of PM2.5 mass concentration by canopy characteristics of urban forest patches
- Abstract：Of interest to researchers and urban planners is the effect of urban forests on concentrations of ambient air pollution. To what extent urban forest patches can improve or subduct air PM2.5 mass concentration is an important question.This study measured the variations of PM2.5 mass concentration (PM2.5AC) under some typical urban forest patches in Nanchang, and analyzed the different responses of PM2.5AC to stand composition and forest canopy characteristic.The results showed that urban forest patches had significant subduction effect on PM2.5AC. Among different forest types, the reduction effect by coniferous forest patches was the highest, which reached to 9.15%, while the reduction by pure broadleaf forest was the lowest with only 3.82%.In temporal pattern, subduction of urban forest patch on PM2.5AC had best effect in spring by 7.34%, but minus effect in winter by 3.76%.In index of canopies, PM2.5AC was shown to depend positively on leaf area index (LAI) and negatively on diffuse none-interceptance (DIFN). In index of patch characteristics, PM2.5AC was positively correlated with patch area, stand structure, and total leaf area of patch. Through the comprehensive analysis of urban forest patches, total leaf area of patch is considered as the most important influence factor for PM2.5AC.