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Campioli M, Malhi Y, Vicca S, Luyssaert S, Papale D, Peñuelas J, Reichstein M, Migliavacca M, Arain MA, Janssens IA. Evaluating the convergence between eddy-covariance and biometric methods for assessing carbon budgets of forests. Nat Commun 2016; 7:13717. [PMID: 27966534 PMCID: PMC5171944 DOI: 10.1038/ncomms13717] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 10/27/2016] [Indexed: 11/13/2022] Open
Abstract
The eddy-covariance (EC) micro-meteorological technique and the ecology-based biometric methods (BM) are the primary methodologies to quantify CO2 exchange between terrestrial ecosystems and the atmosphere (net ecosystem production, NEP) and its two components, ecosystem respiration and gross primary production. Here we show that EC and BM provide different estimates of NEP, but comparable ecosystem respiration and gross primary production for forest ecosystems globally. Discrepancies between methods are not related to environmental or stand variables, but are consistently more pronounced for boreal forests where carbon fluxes are smaller. BM estimates are prone to underestimation of net primary production and overestimation of leaf respiration. EC biases are not apparent across sites, suggesting the effectiveness of standard post-processing procedures. Our results increase confidence in EC, show in which conditions EC and BM estimates can be integrated, and which methodological aspects can improve the convergence between EC and BM.
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Affiliation(s)
- M. Campioli
- Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium
| | - Y. Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, UK
| | - S. Vicca
- Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium
| | - S. Luyssaert
- LSCE CEA-CNRS-UVSQ, Orme des Merisiers, F-91191 Gif-sur-Yvette, France
| | - D. Papale
- DIBAF, University of Tuscia, 01100 Viterbo, Italy
- Euro-Mediterranean Center on Climate Change, CMCC, 73100 Lecce, Italy
| | - J. Peñuelas
- CSIC, Global Ecology Unit, CREAF-CEAB-CSIC-UAB, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain
- CREAF, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain
| | - M. Reichstein
- Max Planck Institute for Biogeochemistry, 07745 Jena, Germany
| | - M. Migliavacca
- Max Planck Institute for Biogeochemistry, 07745 Jena, Germany
| | - M. A. Arain
- School of Geography & Earth Sciences, McMaster University, Hamilton, Ontario, Canada L8S 4K1
| | - I. A. Janssens
- Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium
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Rodríguez-Calcerrada J, Jaeger C, Limousin JM, Ourcival JM, Joffre R, Rambal S. Leaf CO2 efflux is attenuated by acclimation of respiration to heat and drought in a Mediterranean tree. Funct Ecol 2011. [DOI: 10.1111/j.1365-2435.2011.01862.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Joslin JD, Gaudinski JB, Torn MS, Riley WJ, Hanson PJ. Fine-root turnover patterns and their relationship to root diameter and soil depth in a 14C-labeled hardwood forest. THE NEW PHYTOLOGIST 2006; 172:523-35. [PMID: 17083682 DOI: 10.1111/j.1469-8137.2006.01847.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Characterization of turnover times of fine roots is essential to understanding patterns of carbon allocation in plants and describing forest C cycling. We used the rate of decline in the ratio of 14C to 12C in a mature hardwood forest, enriched by an inadvertent 14C pulse, to investigate fine-root turnover and its relationship with fine-root diameter and soil depth. Biomass and Delta14C values were determined for fine roots collected during three consecutive winters from four sites, by depth, diameter size classes (< 0.5 or 0.5-2 mm), and live-or-dead status. Live-root pools retained significant 14C enrichment over 3 yr, demonstrating a mean turnover time on the order of years. However, elevated Delta14C values in dead-root pools within 18 months of the pulse indicated an additional component of live roots with short turnover times (months). Our results challenge assumptions of a single live fine-root pool with a unimodal and normal age distribution. Live fine roots < 0.5 mm and those near the surface, especially those in the O horizon, had more rapid turnover than 0.5-2 mm roots and deeper roots, respectively.
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Affiliation(s)
- J D Joslin
- Below-ground Forest Research, Apartado 104-5655, Monteverde, Puntarenas, Costa Rica.
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