Time lag characteristics of stem sap flow of common tree species during their growth season in Beijing downtown. The status and trend on the urban tree canopy research Ozone uptake at the canopy level in Robinia pseudoacacia in Beijing based on sap flow measurements Calculation of carbon storage and sequestration in the urban trees of Beijing Inspection of Growth Quality for Urban Trees Growth and Health Status of Ginkgo biloba in Beijing Urban Street Area Magnolia liliiflora whole-tree sap flow in response to multiple environmental variables in Beijing. Nocturnal sap flow of four urban greening tree species in Dalian, Liaoning Province, China