An improved theory for calculating leaf gas exchange more precisely accounting for small fluxes

编号 040028801

推送时间 20210426

研究领域 森林培育 

年份 2021 

类型 期刊 

语种 英语

标题 An improved theory for calculating leaf gas exchange more precisely accounting for small fluxes

来源期刊 Nature Plants

期 第288期

发表时间 20210301

关键词 gas exchange;  leaf;  von Caemmerer and Farquhar (vCF); 

摘要 The widely used theory for gas exchange proposed by von Caemmerer and Farquhar (vCF) integrates molar fluxes, mole fraction gradients and ternary effects but does not account for cuticular fluxes, for separation of the leaf surface conditions or for ternary effects within the boundary layer. The magnitude of cuticular conductance to water (gcw) is a key factor for determining plant survival in drought but is difficult to measure and often neglected in routine gas exchange studies. The vCF ternary effect is applied to the total flux without the recognition of different pathways that are affected by it. These simplifications lead to errors in estimations of stomatal conductance, intercellular carbon dioxide concentration (Ci) and other gas exchange parameters. The theory presented here is a more precise physical approach to the electrical resistance analogy for gas exchange, resulting in a more accurate calculation of gas exchange parameters. Additionally, we extend our theory, using physiological concepts, to create a model that allows us to calculate cuticular conductance to water.

服务人员 孙小满

服务院士 尹伟伦

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