Optimal stomatal theory predicts CO2 responses of stomatal conductance in both gymnosperm and angiosperm trees

编号 040037204

推送时间 20221205

研究领域 森林培育 

年份 2022 

类型 期刊 

语种 英语

标题 Optimal stomatal theory predicts CO2 responses of stomatal conductance in both gymnosperm and angiosperm trees

来源期刊 The New phytologist

期 第372期

发表时间 20221113

关键词 Free-air CO2 enrichment;  climate change;  deciduous;  evergreen;  photosynthesis;  water use efficiency.; 

摘要 Optimal stomatal theory predicts that stomata operate to maximize photosynthesis (Anet ) and minimize transpirational water loss to achieve optimal intrinsic water-use efficiency (iWUE). We tested whether this theory can predict stomatal responses to elevated atmospheric CO2 (eCO2 ), and whether it can capture differences in responsiveness among woody plant functional types (PFTs). We conducted a meta-analysis of tree studies of the effect of eCO2 on iWUE and its components Anet and stomatal conductance (gs ). We compared three plant functional types (PFTs), using the Unified Stomatal Optimisation (USO) model to account for confounding effects of leaf-air vapour pressure difference (D). We expected smaller gs , but greater Anet , responses to eCO2 in gymnosperms compared to angiosperm PFTs. We found that iWUE increased in proportion to increasing eCO2 in all PFTs, and that increases in Anet had stronger effects than reductions in gs . The USO model correctly captured stomatal behaviour with eCO2 across most datasets. The chief difference among PFTs was a lower stomatal slope parameter (g1 ) for the gymnosperm, compared to angiosperm, species. Land surface models can use the USO model to describe stomatal behaviour under changing atmospheric CO2 conditions.

服务人员 孙小满

服务院士 尹伟伦

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