气候变化领域集成服务门户(CCPortal): Assessing Impacts of Plant Stoichiometric Traits on Terrestrial Ecosystem Carbon Accumulation Using the E3SM Land Model

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DOI	10.1029/2019MS001841
	Assessing Impacts of Plant Stoichiometric Traits on Terrestrial Ecosystem Carbon Accumulation Using the E3SM Land Model
	Zhu Q.; Riley W.J.; Iversen C.M.; Kattge J.
发表日期	2020
ISSN	19422466
卷号	12 期号:4
英文摘要	Carbon (C) enters into the terrestrial ecosystems via photosynthesis and cycles through the system together with other essential nutrients (i.e., nitrogen [N] and phosphorus [P]). Such a strong coupling of C, N, and P leads to the theoretical prediction that limited nutrient availability will limit photosynthesis rate, plant growth, and future terrestrial C dynamics. However, the lack of reliable information about plant tissue stoichiometric constraints remains a challenge for quantifying nutrient limitations on projected global C cycling. In this study, we harmonized observed plant tissue C:N:P stoichiometry from more than 6,000 plant species with the commonly used plant functional type framework in global land models. Using observed C:N:P stoichiometry and the flexibility of these ratios as emergent plant traits, we show that observationally constrained fixed plant stoichiometry does not improve model estimates of present-day C dynamics compared with unconstrained stoichiometry. However, adopting stoichiometric flexibility significantly improves model predictions of C fluxes and stocks. The 21st century simulations with RCP8.5 CO2 concentrations show that stoichiometric flexibility, rather than baseline stoichiometric ratios, is the dominant controller of plant productivity and ecosystem C accumulation in modeled responses to CO2 fertilization. The enhanced nutrient limitations and plant P use efficiency mainly explain this result. This study is consistent with the previous consensus that nutrient availability will limit xfuture land carbon sequestration but challenges the idea that imbalances between C and nutrient supplies and fixed stoichiometry limit future land C sinks. We show here that it is necessary to represent nutrient stoichiometric flexibility in models to accurately project future terrestrial ecosystem carbon sequestration. © 2020. The Authors.
英文关键词	carbon-nutrient interactions; earth system land model (E3SM); future ecosystem carbon accumulation
语种	英语
scopus关键词	Carbon; Carbon dioxide; Ecosystems; Photosynthesis; Stoichiometry; Tissue; Carbon sequestration; Nutrient availability; Nutrient limitations; Photosynthesis rate; Plant functional type; Stoichiometric constraints; Stoichiometric ratio; Terrestrial ecosystems; Nutrients; carbon dioxide; carbon sequestration; concentration (composition); growth rate; nitrogen; nutrient availability; nutrient dynamics; nutrient limitation; phosphorus; photosynthesis; stoichiometry
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156722
作者单位	Climate Sciences Department, Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Max Planck Institute for Biogeochemistry, Jena, Germany
推荐引用方式 GB/T 7714	Zhu Q.,Riley W.J.,Iversen C.M.,et al. Assessing Impacts of Plant Stoichiometric Traits on Terrestrial Ecosystem Carbon Accumulation Using the E3SM Land Model[J],2020,12(4).
APA	Zhu Q.,Riley W.J.,Iversen C.M.,&Kattge J..(2020).Assessing Impacts of Plant Stoichiometric Traits on Terrestrial Ecosystem Carbon Accumulation Using the E3SM Land Model.Journal of Advances in Modeling Earth Systems,12(4).
MLA	Zhu Q.,et al."Assessing Impacts of Plant Stoichiometric Traits on Terrestrial Ecosystem Carbon Accumulation Using the E3SM Land Model".Journal of Advances in Modeling Earth Systems 12.4(2020).