DOI: 10.1111/nph.16327
论文题名: Whole-plant optimality predicts changes in leaf nitrogen under variable CO2 and nutrient availability
作者: Caldararu S. ; Thum T. ; Yu L. ; Zaehle S.
刊名: New Phytologist
ISSN: 0028646X
出版年: 2020
卷: 225, 期: 6 语种: 英语
英文关键词: ecosystem modelling
; elevated CO2
; nitrogen (N) limitation
; optimality theory
; plant physiology
; plant plasticity
; vegetation modelling
Scopus关键词: carbon dioxide
; concentration (composition)
; ecosystem response
; empirical analysis
; error analysis
; fertilizer application
; global change
; nitrogen
; nutrient availability
; nutrient enrichment
; nutrient limitation
; optimization
; phenotypic plasticity
; physiology
; vegetation dynamics
英文摘要: Vegetation nutrient limitation is essential for understanding ecosystem responses to global change. In particular, leaf nitrogen (N) is known to be plastic under changed nutrient limitation. However, models can often not capture these observed changes, leading to erroneous predictions of whole-ecosystem stocks and fluxes. We hypothesise that an optimality approach can improve representation of leaf N content compared to existing empirical approaches. Unlike previous optimality-based approaches, which adjust foliar N concentrations based on canopy carbon export, we use a maximisation criterion based on whole-plant growth, and allow for a lagged response of foliar N to this maximisation criterion to account for the limited plasticity of this plant trait. We test these model variants at a range of Free-Air CO2 Enrichment and N fertilisation experimental sites. We show that a model based solely on canopy carbon export fails to reproduce observed patterns and predicts decreasing leaf N content with increased N availability. However, an optimal model which maximises total plant growth can correctly reproduce the observed patterns. The optimality model we present here is a whole-plant approach which reproduces biologically realistic changes in leaf N and can thereby improve ecosystem-level predictions under transient conditions. © 2019 The Authors. New Phytologist ©2019 New Phytologist Trust
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158777
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Max Planck Institute for Biogeochemistry, Hans-Knöll Str. 10, Jena, 07745, Germany; Michael Stifel Center Jena for Data-Driven and Simulation Science, Jena, 07745, Germany
Recommended Citation:
Caldararu S.,Thum T.,Yu L.,et al. Whole-plant optimality predicts changes in leaf nitrogen under variable CO2 and nutrient availability[J]. New Phytologist,2020-01-01,225(6)