蒸腾作用
光合有效辐射
用水效率
蒸汽压差
光合作用
气溶胶
环境科学
生态系统
农学
大气科学
二氧化碳
植物
化学
园艺
生物
生态学
有机化学
地质学
作者
Bin Wang,Z.-F. Wang,Chengzhang Wang,Xin Wang,Jia Zhou,Lingli Liu
摘要
Aerosols could significantly influence ecosystem carbon and water fluxes, potentially altering their interconnected dynamics, typically characterized by water-use efficiency (WUE). However, our understanding of the underlying ecophysiological mechanisms remains limited due to insufficient field observations. We conducted 4-yr measurements of leaf photosynthesis and transpiration, as well as 3-yr measurements of stem growth (SG) and sap flow of poplar trees exposed to natural aerosol fluctuation, to elucidate aerosol's impact on plant WUE. We found that aerosol improved sun leaf WUE mainly because a sharp decline in photosynthetically active radiation (PAR) inhibited its transpiration, while photosynthesis was less affected, as the negative effect induced by declined PAR was offset by the positive effect induced by low leaf vapor pressure deficit (VPD
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