The relationship of leaf photosynthetic traits – Vcmax and Jmax – to leaf nitrogen, leaf phosphorus, and specific leaf area: a meta‐analysis and modeling study

Ecology and Evolution

Anthony P. Walker¹  Andrew P. Beckerman²  Lianhong Gu⁷  Jens Kattge⁴  Lucas A. Cernusak⁶  Tomas F. Domingues⁵  Joanna C. Scales³  Georg Wohlfahrt⁸  Stan D. Wullschleger⁷ 

[1] Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK;ORCID:orcid.org/0000-0002-4797-9143;Plant Biology and Crop Science, Rothamsted Research, Harpenden, Herts, UK;Max Plank Institute for Biogeochemistry, Jena, Germany;Depto. de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Ribeirão Preto, Brasil;Department of Marine and Tropical Biology Cairns, James Cook University, Cairns, Queensland, Australia;Environmental Sciences Division, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, Tennessee;University of Innsbruck, Institute of Ecology, Innsbruck, Austria

关键词: Carbon assimilation;    carbon cycle;    carboxylation;    DGVM;    electron transport;    Farquhar model;    land surface model;    meta‐analysis;    mixed‐effect multiple regression;    noncarbon photosynthesis;    TBM;   

DOI  :  10.1002/ece3.1173

来源: Wiley

【 摘 要 】

Abstract

Great uncertainty exists in the global exchange of carbon between the atmosphere and the terrestrial biosphere. An important source of this uncertainty lies in the dependency of photosynthesis on the maximum rate of carboxylation (V_cmax) and the maximum rate of electron transport (J_max). Understanding and making accurate prediction of C fluxes thus requires accurate characterization of these rates and their relationship with plant nutrient status over large geographic scales. Plant nutrient status is indicated by the traits: leaf nitrogen (N), leaf phosphorus (P), and specific leaf area (SLA). Correlations between V_cmax and J_max and leaf nitrogen (N) are typically derived from local to global scales, while correlations with leaf phosphorus (P) and specific leaf area (SLA) have typically been derived at a local scale. Thus, there is no global-scale relationship between V_cmax and J_max and P or SLA limiting the ability of global-scale carbon flux models do not account for P or SLA. We gathered published data from 24 studies to reveal global relationships of V_cmax and J_max with leaf N, P, and SLA. V_cmax was strongly related to leaf N, and increasing leaf P substantially increased the sensitivity of V_cmax to leaf N. J_max was strongly related to V_cmax, and neither leaf N, P, or SLA had a substantial impact on the relationship. Although more data are needed to expand the applicability of the relationship, we show leaf P is a globally important determinant of photosynthetic rates. In a model of photosynthesis, we showed that at high leaf N (3 gm⁻²), increasing leaf P from 0.05 to 0.22 gm⁻² nearly doubled assimilation rates. Finally, we show that plants may employ a conservative strategy of J_max to V_cmax coordination that restricts photoinhibition when carboxylation is limiting at the expense of maximizing photosynthetic rates when light is limiting.

【 授权许可】

CC BY   
© 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.