title: Water, heat, and airborne pollutants effects on transpiration of urban trees.
abstract: Transpiration rates of six urban tree species in Beijing evaluated by thermal dissipation method for one year were correlated to environmental variables in heat, water, and pollutant groups. To sort out colinearity of the explanatory variables, their individual and joint contributions to variance of tree transpiration were determined by the variation and hierarchical partitioning methods. Majority of the variance in transpiration rates was associated with joint effects of variables in heat and water groups and variance due to individual effects of explanatory group were in comparison small. Atmospheric pollutants exerted only minor effects on tree transpiration. Daily transpiration rate was most affected by air temperature, soil temperature, total radiation, vapor pressure deficit, and ozone. Relative humidity would replace soil temperature when factors influencing hourly transpiration rate was considered.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Ouyang
authors.forename: Weiping
authors.initials: W
authors.lastname: Chen
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Zheng
authors.forename: Yufen
authors.initials: Y
authors.lastname: Ren
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000633:toxicity*; D000397:Air Pollution / Q000706:statistics & numerical data; D001272:Atmosphere / Q000737:chemistry; D005618:Fresh Water / Q000032:analysis*; D006358:Hot Temperature; D009585:Nitrogen Dioxide / Q000032:analysis / Q000633:toxicity; D010126:Ozone / Q000032:analysis / Q000633:toxicity; D052638:Particulate Matter / Q000032:analysis / Q000633:toxicity; D018526:Plant Transpiration / Q000187:drug effects*; D012987:Soil / Q000737:chemistry; D013458:Sulfur Dioxide / Q000032:analysis / Q000633:toxicity; D014197:Trees / Q000187:drug effects* / Q000502:physiology; D055548:Vapor Pressure
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D012987:Soil; D013458:Sulfur Dioxide; D010126:Ozone; D009585:Nitrogen Dioxide