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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). |
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