Influence of air–soil temperature on leaf expansion and LAI of Carpinus betulus trees in a temperate urban forest patch

摘要: Abstract Air temperature is effective meteorological parameter in overall leaf phenology of deciduous temperate forests. Not only the air but also soil influences seasonal development trees. In order to determine extent and impact on Carpinus betulus leaves, we analyzed two significant parameters; area (LA) index (LAI) as an indicator development. We monitored LA expansion through harvesting with about weekly intervals from early April late May, LAI hemispherical photographing mid-March mid-June. After budburst unfolding between March April, mean consecutively exhibited increasing patterns until their maximums (2.70 28.60 cm 2 ) May respectively. Both trends were accordance particularly temperatures all layers. Namely, coefficients ( r at least 0.88 indicating high significance P  = 0.76, 0.82 for maximum, minimum temperatures, However, correlations insignificant. Unlike current year, there both preceding year's  = 0.05) sunlight duration  = 0.02). Consequently, results revealed importance relatively less referred parameter; temperature, primarily urban forest trees which are susceptible anthropogenic climate warming.