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Where does the carbon go? A model-data intercomparison of vegetation carbon allocation and turnover processes at two temperate forest free-air CO2 enrichment sites
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Where does the carbon go? A model-data intercomparison of vegetation carbon allocation and turnover processes at two temperate forest free-air CO2 enrichment sites.pdf | Published version | 950.4 kB | Adobe PDF | View/Open |
Title: | Where does the carbon go? A model-data intercomparison of vegetation carbon allocation and turnover processes at two temperate forest free-air CO2 enrichment sites |
Authors: | De Kauwe, MG Medlyn, BE Zaehle, S Walker, AP Dietze, MC Wang, Y-P Luo, Y Jain, AK El-Masri, B Hickler, T Warlind, D Weng, E Parton, WJ Thornton, PE Wang, S Prentice, IC Asao, S Smith, B McCarthy, HR Iversen, CM Hanson, PJ Warren, JM Oren, R Norby, RJ |
Item Type: | Journal Article |
Abstract: | Elevated atmospheric CO 2 concentration (eCO 2 ) has the potential to increase vegetation carbon storage if increased net primary production causes increased long-lived biomass. Model predictions of eCO 2 effects on vegetation carbon storage depend on how allocation and turnover processes are represented. We used data from two temperate forest free-air CO 2 enrichment (FACE) experiments to evaluate representations of allocation and turnover in 11 ecosystem models. Observed eCO 2 effects on allocation were dynamic. Allocation schemes based on func- tional relationships among biomass fractions that vary with resource availability were best able to capture the general features of the observations. Allocation schemes based on constant fractions or resource limitations performed less well, with some models having unintended outcomes. Few models represent turnover processes mechanistically and there was wide vari- ation in predictions of tissue lifespan. Consequently, models did not perform well at predicting eCO 2 effects on vegetation carbon storage. Our recommendations to reduce uncertainty include: use of allocation schemes constrained by biomass fractions; careful testing of allocation schemes; and synthesis of allocation and turnover data in terms of model parameters. Data from intensively studied ecosystem manip- ulation experiments are invaluable for constraining models and we recommend that such experiments should attempt to fully quantify carbon, water and nutrient budgets. |
Issue Date: | 21-May-2014 |
Date of Acceptance: | 8-Apr-2014 |
URI: | http://hdl.handle.net/10044/1/56727 |
DOI: | https://dx.doi.org/10.1111/nph.12847 |
ISSN: | 0028-646X |
Publisher: | WILEY-BLACKWELL |
Start Page: | 883 |
End Page: | 899 |
Journal / Book Title: | NEW PHYTOLOGIST |
Volume: | 203 |
Issue: | 3 |
Copyright Statement: | © 2014 The Authors New Phytologist © 2014 New Phytologist Trust. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/3.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Science & Technology Life Sciences & Biomedicine Plant Sciences allocation carbon (C) climate change CO2 fertilisation elevated CO2 free-air CO2 enrichment (FACE) models phenology ELEVATED ATMOSPHERIC CO2 FINE-ROOT PRODUCTION CLIMATE-CHANGE DECIDUOUS FOREST NITROGEN UPTAKE USE EFFICIENCY SOIL CARBON PINE FOREST DYNAMICS RESPONSES Air Biomass Carbon Carbon Dioxide Computer Simulation Ecosystem Forests Models, Theoretical Trees Wood 06 Biological Sciences 07 Agricultural And Veterinary Sciences Plant Biology & Botany |
Publication Status: | Published |
Appears in Collections: | Department of Life Sciences Grantham Institute for Climate Change Faculty of Natural Sciences |