DOI: 10.1111/tpj.14587
论文题名: Mesophyll conductance in land surface models: effects on photosynthesis and transpiration
作者: Knauer J. ; Zaehle S. ; De Kauwe M.G. ; Haverd V. ; Reichstein M. ; Sun Y.
刊名: Plant Journal
ISSN: 9607412
出版年: 2020
卷: 101, 期: 4 语种: 英语
英文关键词: Earth system modelling
; leaf internal CO2 transfer
; photosynthesis
; plant gas exchange
; transpiration
Scopus关键词: Carbon dioxide
; Evapotranspiration
; Machinery
; Plants (botany)
; Surface measurement
; Transpiration
; Earth systems
; Environmental conditions
; Explicit representation
; Gas exchange
; Gross primary productivity
; leaf internal CO2 transfer
; Photosynthetic machinery
; Photosynthetic parameters
; Photosynthesis
英文摘要: The CO2 transfer conductance within plant leaves (mesophyll conductance, gm) is currently not considered explicitly in most land surface models (LSMs), but instead treated implicitly as an intrinsic property of the photosynthetic machinery. Here, we review approaches to overcome this model deficiency by explicitly accounting for gm, which comprises the re-adjustment of photosynthetic parameters and a model describing the variation of gm in dependence of environmental conditions. An explicit representation of gm causes changes in the response of photosynthesis to environmental factors, foremost leaf temperature, and ambient CO2 concentration, which are most pronounced when gm is small. These changes in leaf-level photosynthesis translate into a stronger climate and CO2 response of gross primary productivity (GPP) and transpiration at the global scale. The results from two independent studies show consistent latitudinal patterns of these effects with biggest differences in GPP in the boreal zone (up to ~15%). Transpiration and evapotranspiration show spatially similar, but attenuated, changes compared with GPP. These changes are indirect effects of gm caused by the assumed strong coupling between stomatal conductance and photosynthesis in current LSMs. Key uncertainties in these simulations are the variation of gm with light and the robustness of its temperature response across plant types and growth conditions. Future research activities focusing on the response of gm to environmental factors and its relation to other plant traits have the potential to improve the representation of photosynthesis in LSMs and to better understand its present and future role in the Earth system. © 2019 The Authors The Plant Journal © 2019 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159872
Appears in Collections: 气候变化与战略
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作者单位: CSIRO Oceans and Atmosphere, Canberra, ACT 2601, Australia; Department of Biogeochemical Integration, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Michael-Stifel Center Jena for Data-Driven and Simulation Science, Jena, 07745, Germany; ARC Centre of Excellence for Climate Extremes and the Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia; School of Integrative Plant Science, Soil and Crop Sciences Section, Cornell University, Ithaca, NY 14850, United States
Recommended Citation:
Knauer J.,Zaehle S.,De Kauwe M.G.,et al. Mesophyll conductance in land surface models: effects on photosynthesis and transpiration[J]. Plant Journal,2020-01-01,101(4)