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DOI | 10.1111/gcb.14604 |
Effects of mesophyll conductance on vegetation responses to elevated CO2 concentrations in a land surface model | |
Knauer, Juergen1,2; Zaehle, Soenke1,3; De Kauwe, Martin G.4,5; Bahar, Nur H. A.6; Evans, John R.7; Medlyn, Belinda E.8; Reichstein, Markus1,3; Werner, Christiane9 | |
2019-05-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2019 |
卷号 | 25期号:5页码:1820-1838 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Australia |
英文摘要 | Mesophyll conductance (g(m)) is known to affect plant photosynthesis. However, g(m) is rarely explicitly considered in land surface models (LSMs), with the consequence that its role in ecosystem and large-scale carbon and water fluxes is poorly understood. In particular, the different magnitudes of g(m) across plant functional types (PFTs) are expected to cause spatially divergent vegetation responses to elevated CO2 concentrations. Here, an extensive literature compilation of g(m) across major vegetation types is used to parameterize an empirical model of g(m) in the LSM JSBACH and to adjust photosynthetic parameters based on simulated A(n) - C-i curves. We demonstrate that an explicit representation of g(m) changes the response of photosynthesis to environmental factors, which cannot be entirely compensated by adjusting photosynthetic parameters. These altered responses lead to changes in the photosynthetic sensitivity to atmospheric CO2 concentrations which depend both on the magnitude of g(m) and the climatic conditions, particularly temperature. We then conducted simulations under ambient and elevated (ambient + 200 mu mol/mol) CO2 concentrations for contrasting ecosystems and for historical and anticipated future climate conditions (representative concentration pathways; RCPs) globally. The g(m)-explicit simulations using the RCP8.5 scenario resulted in significantly higher increases in gross primary productivity (GPP) in high latitudes (+10% to + 25%), intermediate increases in temperate regions (+5% to + 15%), and slightly lower to moderately higher responses in tropical regions (-2% to +5%), which summed up to moderate GPP increases globally. Similar patterns were found for transpiration, but with a lower magnitude. Our results suggest that the effect of an explicit representation of g(m) is most important for simulated carbon and water fluxes in the boreal zone, where a cold climate coincides with evergreen vegetation. |
英文关键词 | elevated CO2 concentrations land surface modeling mesophyll conductance photosynthetic CO2 sensitivity representative concentration pathways |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465103600020 |
WOS关键词 | CARBON-ISOTOPE DISCRIMINATION ; LEAF NITROGEN-CONTENT ; WATER-USE EFFICIENCY ; PHOTOSYNTHETIC CAPACITY ; TEMPERATURE RESPONSE ; INTERNAL CONDUCTANCE ; DIFFUSION CONDUCTANCE ; TERRESTRIAL BIOSPHERE ; THEORETICAL-ANALYSIS ; C-3 PHOTOSYNTHESIS |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182928 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Max Planck Inst Biogeochem, Dept Biogeochem Integrat, Jena, Germany; 2.Int Max Planck Res Sch Global Biogeochem Cycles I, Jena, Germany; 3.Michael Stifel Ctr Jena Data Driven & Simulat Sci, Jena, Germany; 4.Univ New South Wales, ARC Ctr Excellence Climate Extremes, Sydney, NSW, Australia; 5.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia; 6.Australian Natl Univ, ARC Ctr Excellence Plant Energy Biol, Div Plant Sci, Res Sch Biol, Canberra, ACT, Australia; 7.Australian Natl Univ, ARC Ctr Excellence Translat Photosynth, Div Plant Sci, Res Sch Biol, Canberra, ACT, Australia; 8.Western Sydney Univ, Hawkesbury Inst Environm, Richmond, NSW, Australia; 9.Univ Freiburg, Dept Ecosyst Physiol, Freiburg, Germany |
推荐引用方式 GB/T 7714 | Knauer, Juergen,Zaehle, Soenke,De Kauwe, Martin G.,et al. Effects of mesophyll conductance on vegetation responses to elevated CO2 concentrations in a land surface model[J]. GLOBAL CHANGE BIOLOGY,2019,25(5):1820-1838. |
APA | Knauer, Juergen.,Zaehle, Soenke.,De Kauwe, Martin G..,Bahar, Nur H. A..,Evans, John R..,...&Werner, Christiane.(2019).Effects of mesophyll conductance on vegetation responses to elevated CO2 concentrations in a land surface model.GLOBAL CHANGE BIOLOGY,25(5),1820-1838. |
MLA | Knauer, Juergen,et al."Effects of mesophyll conductance on vegetation responses to elevated CO2 concentrations in a land surface model".GLOBAL CHANGE BIOLOGY 25.5(2019):1820-1838. |
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