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Jackson T, Shenkin A, Moore J, Bunce A, van Emmerik T, Kane B, Burcham D, James K, Selker J, Calders K, Origo N, Disney M, Burt A, Wilkes P, Raumonen P, Gonzalez de Tanago Menaca J, Lau A, Herold M, Goodman RC, Fourcaud T, Malhi Y. An architectural understanding of natural sway frequencies in trees. J R Soc Interface 2019; 16:20190116. [PMID: 31164076 DOI: 10.1098/rsif.2019.0116] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The relationship between form and function in trees is the subject of a longstanding debate in forest ecology and provides the basis for theories concerning forest ecosystem structure and metabolism. Trees interact with the wind in a dynamic manner and exhibit natural sway frequencies and damping processes that are important in understanding wind damage. Tree-wind dynamics are related to tree architecture, but this relationship is not well understood. We present a comprehensive view of natural sway frequencies in trees by compiling a dataset of field measurement spanning conifers and broadleaves, tropical and temperate forests. The field data show that a cantilever beam approximation adequately predicts the fundamental frequency of conifers, but not that of broadleaf trees. We also use structurally detailed tree dynamics simulations to test fundamental assumptions underpinning models of natural frequencies in trees. We model the dynamic properties of greater than 1000 trees using a finite-element approach based on accurate three-dimensional model trees derived from terrestrial laser scanning data. We show that (1) residual variation, the variation not explained by the cantilever beam approximation, in fundamental frequencies of broadleaf trees is driven by their architecture; (2) slender trees behave like a simple pendulum, with a single natural frequency dominating their motion, which makes them vulnerable to wind damage and (3) the presence of leaves decreases both the fundamental frequency and the damping ratio. These findings demonstrate the value of new three-dimensional measurements for understanding wind impacts on trees and suggest new directions for improving our understanding of tree dynamics from conifer plantations to natural forests.
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Affiliation(s)
- T Jackson
- 1 Environmental Change Institute, School of Geography and the Environment, University of Oxford , Oxford OX1 3QY , UK
| | - A Shenkin
- 1 Environmental Change Institute, School of Geography and the Environment, University of Oxford , Oxford OX1 3QY , UK
| | - J Moore
- 2 Scion , 49 Sala Street, Rotorua 3010 , New Zealand
| | - A Bunce
- 3 Department of Natural Resources, University of Connecticut , Mansfield, CT 06269 , USA
| | - T van Emmerik
- 4 Water Resources Section, Delft University of Technology , Stevinweg 1, 2628 CN, Delft , The Netherlands.,5 Hydrology and Quantitative Water Management Group, Wageningen University , Wageningen , The Netherlands
| | - B Kane
- 6 Department of Environmental Conservation, University of Massachusetts , Amherst, MA 01003 , USA
| | - D Burcham
- 7 Centre for Urban Greenery and Ecology , National Parks Board, 259569 Singapore
| | - K James
- 8 School of Ecosystem and Forest Sciences, Faculty of Science, University of Melbourne , Melbourne , Australia
| | - J Selker
- 9 Oregon State University , Corvallis, OR 97331 , USA
| | - K Calders
- 10 CAVElab - Computational and Applied Vegetation Ecology, Ghent University , Ghent , Belgium
| | - N Origo
- 11 Earth Observation, Climate and Optical Group, National Physical Laboratory , Hampton Road, Teddington, Middlesex TW11 0LW , UK.,12 Department of Geography, University College London , London WC1E 6BT , UK
| | - M Disney
- 12 Department of Geography, University College London , London WC1E 6BT , UK.,13 NERC National Centre for Earth Observation (NCEO) , Leicester , UK
| | - A Burt
- 12 Department of Geography, University College London , London WC1E 6BT , UK
| | - P Wilkes
- 12 Department of Geography, University College London , London WC1E 6BT , UK.,13 NERC National Centre for Earth Observation (NCEO) , Leicester , UK
| | - P Raumonen
- 14 Tampere University of Technology , Korkeakoulunkatu 10, 33720 Tampere , Finland
| | - J Gonzalez de Tanago Menaca
- 15 Laboratory of Geo-Information Science and Remote Sensing, Wageningen University , Droevendaalsesteeg 3, 6708 PB Wageningen , The Netherlands.,16 Center for International Forestry Research (CIFOR) , PO Box 0113 BOCBD, Bogor 16000 , Indonesia
| | - A Lau
- 15 Laboratory of Geo-Information Science and Remote Sensing, Wageningen University , Droevendaalsesteeg 3, 6708 PB Wageningen , The Netherlands.,16 Center for International Forestry Research (CIFOR) , PO Box 0113 BOCBD, Bogor 16000 , Indonesia
| | - M Herold
- 15 Laboratory of Geo-Information Science and Remote Sensing, Wageningen University , Droevendaalsesteeg 3, 6708 PB Wageningen , The Netherlands
| | - R C Goodman
- 17 Department of Forest Ecology and Management, Swedish University of Agricultural Sciences , Umeå , Sweden
| | - T Fourcaud
- 18 AMAP, University of Montpellier, CIRAD, CNRS, INRA, IRD , Montpellier , France
| | - Y Malhi
- 1 Environmental Change Institute, School of Geography and the Environment, University of Oxford , Oxford OX1 3QY , UK
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Burton C, Rifai S, Malhi Y. Inter-comparison and assessment of gridded climate products over tropical forests during the 2015/2016 El Niño. Philos Trans R Soc Lond B Biol Sci 2018; 373:20170406. [PMID: 30297471 PMCID: PMC6178435 DOI: 10.1098/rstb.2017.0406] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/25/2018] [Indexed: 11/12/2022] Open
Abstract
To understand the impacts of extreme climate events, it is first necessary to understand the spatio-temporal characteristics of the event. Gridded climate products are frequently used to describe climate patterns but have been shown to perform poorly over data-sparse regions such as tropical forests. Often, they are uncritically employed in a wide range of studies linking tropical forest processes to large-scale climate variability. Here, we conduct an inter-comparison and assessment of near-surface air temperature fields supplied by four state-of-the-art reanalysis products, along with precipitation estimates supplied by four merged satellite-gauge rainfall products. Firstly, spatio-temporal patterns of temperature and precipitation anomalies during the 2015-2016 El Niño are shown for each product to characterize the impact of the El Niño on the tropical forest biomes of Equatorial Africa, Southeast Asia and South America. Using meteorological station data, a two-stage assessment is then conducted to determine which products most reliably model tropical climates during the 2015-2016 El Niño, and which perform best over the longer-term satellite observation period (1980-2016). Results suggest that eastern Amazonia, parts of the Congo Basin and mainland Southeast Asia all experienced significant monthly mean temperature anomalies during the El Niño, while northeastern Amazonia, eastern Borneo and southern New Guinea experienced significant precipitation deficits. Our results suggest ERA-Interim and MERRA2 are the most reliable air temperature datasets, while TRMM 3B42 V7 and CHIRPS v2.0 are the best-performing rainfall datasets.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.
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Affiliation(s)
- C Burton
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK
| | - S Rifai
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK
| | - Y Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK
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3
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Levis C, Costa FRC, Bongers F, Peña-Claros M, Clement CR, Junqueira AB, Neves EG, Tamanaha EK, Figueiredo FOG, Salomão RP, Castilho CV, Magnusson WE, Phillips OL, Guevara JE, Sabatier D, Molino JF, López DC, Mendoza AM, Pitman NCA, Duque A, Vargas PN, Zartman CE, Vasquez R, Andrade A, Camargo JL, Feldpausch TR, Laurance SGW, Laurance WF, Killeen TJ, Nascimento HEM, Montero JC, Mostacedo B, Amaral IL, Guimarães Vieira IC, Brienen R, Castellanos H, Terborgh J, Carim MDJV, Guimarães JRDS, Coelho LDS, Matos FDDA, Wittmann F, Mogollón HF, Damasco G, Dávila N, García-Villacorta R, Coronado ENH, Emilio T, Filho DDAL, Schietti J, Souza P, Targhetta N, Comiskey JA, Marimon BS, Marimon BH, Neill D, Alonso A, Arroyo L, Carvalho FA, de Souza FC, Dallmeier F, Pansonato MP, Duivenvoorden JF, Fine PVA, Stevenson PR, Araujo-Murakami A, Aymard C. GA, Baraloto C, do Amaral DD, Engel J, Henkel TW, Maas P, Petronelli P, Revilla JDC, Stropp J, Daly D, Gribel R, Paredes MR, Silveira M, Thomas-Caesar R, Baker TR, da Silva NF, Ferreira LV, Peres CA, Silman MR, Cerón C, Valverde FC, Di Fiore A, Jimenez EM, Mora MCP, Toledo M, Barbosa EM, Bonates LCDM, Arboleda NC, Farias EDS, Fuentes A, Guillaumet JL, Jørgensen PM, Malhi Y, de Andrade Miranda IP, Phillips JF, Prieto A, Rudas A, Ruschel AR, Silva N, von Hildebrand P, Vos VA, Zent EL, Zent S, Cintra BBL, Nascimento MT, Oliveira AA, Ramirez-Angulo H, Ramos JF, Rivas G, Schöngart J, Sierra R, Tirado M, van der Heijden G, Torre EV, Wang O, Young KR, Baider C, Cano A, Farfan-Rios W, Ferreira C, Hoffman B, Mendoza C, Mesones I, Torres-Lezama A, Medina MNU, van Andel TR, Villarroel D, Zagt R, Alexiades MN, Balslev H, Garcia-Cabrera K, Gonzales T, Hernandez L, Huamantupa-Chuquimaco I, Manzatto AG, Milliken W, Cuenca WP, Pansini S, Pauletto D, Arevalo FR, Reis NFC, Sampaio AF, Giraldo LEU, Sandoval EHV, Gamarra LV, Vela CIA, ter Steege H. Persistent effects of pre-Columbian plant domestication on Amazonian forest composition. Science 2017; 355:925-931. [DOI: 10.1126/science.aal0157] [Citation(s) in RCA: 306] [Impact Index Per Article: 43.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 01/20/2017] [Indexed: 11/02/2022]
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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5
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Rowland L, da Costa ACL, Galbraith DR, Oliveira RS, Binks OJ, Oliveira AAR, Pullen AM, Doughty CE, Metcalfe DB, Vasconcelos SS, Ferreira LV, Malhi Y, Grace J, Mencuccini M, Meir P. Death from drought in tropical forests is triggered by hydraulics not carbon starvation. Nature 2015; 528:119-22. [DOI: 10.1038/nature15539] [Citation(s) in RCA: 370] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 09/02/2015] [Indexed: 11/09/2022]
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6
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Brienen RJW, Phillips OL, Feldpausch TR, Gloor E, Baker TR, Lloyd J, Lopez-Gonzalez G, Monteagudo-Mendoza A, Malhi Y, Lewis SL, Vásquez Martinez R, Alexiades M, Álvarez Dávila E, Alvarez-Loayza P, Andrade A, Aragão LEOC, Araujo-Murakami A, Arets EJMM, Arroyo L, Aymard C GA, Bánki OS, Baraloto C, Barroso J, Bonal D, Boot RGA, Camargo JLC, Castilho CV, Chama V, Chao KJ, Chave J, Comiskey JA, Cornejo Valverde F, da Costa L, de Oliveira EA, Di Fiore A, Erwin TL, Fauset S, Forsthofer M, Galbraith DR, Grahame ES, Groot N, Hérault B, Higuchi N, Honorio Coronado EN, Keeling H, Killeen TJ, Laurance WF, Laurance S, Licona J, Magnussen WE, Marimon BS, Marimon-Junior BH, Mendoza C, Neill DA, Nogueira EM, Núñez P, Pallqui Camacho NC, Parada A, Pardo-Molina G, Peacock J, Peña-Claros M, Pickavance GC, Pitman NCA, Poorter L, Prieto A, Quesada CA, Ramírez F, Ramírez-Angulo H, Restrepo Z, Roopsind A, Rudas A, Salomão RP, Schwarz M, Silva N, Silva-Espejo JE, Silveira M, Stropp J, Talbot J, ter Steege H, Teran-Aguilar J, Terborgh J, Thomas-Caesar R, Toledo M, Torello-Raventos M, Umetsu RK, van der Heijden GMF, van der Hout P, Guimarães Vieira IC, Vieira SA, Vilanova E, Vos VA, Zagt RJ. Long-term decline of the Amazon carbon sink. Nature 2015; 519:344-8. [PMID: 25788097 DOI: 10.1038/nature14283] [Citation(s) in RCA: 339] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 02/04/2015] [Indexed: 11/09/2022]
Abstract
Atmospheric carbon dioxide records indicate that the land surface has acted as a strong global carbon sink over recent decades, with a substantial fraction of this sink probably located in the tropics, particularly in the Amazon. Nevertheless, it is unclear how the terrestrial carbon sink will evolve as climate and atmospheric composition continue to change. Here we analyse the historical evolution of the biomass dynamics of the Amazon rainforest over three decades using a distributed network of 321 plots. While this analysis confirms that Amazon forests have acted as a long-term net biomass sink, we find a long-term decreasing trend of carbon accumulation. Rates of net increase in above-ground biomass declined by one-third during the past decade compared to the 1990s. This is a consequence of growth rate increases levelling off recently, while biomass mortality persistently increased throughout, leading to a shortening of carbon residence times. Potential drivers for the mortality increase include greater climate variability, and feedbacks of faster growth on mortality, resulting in shortened tree longevity. The observed decline of the Amazon sink diverges markedly from the recent increase in terrestrial carbon uptake at the global scale, and is contrary to expectations based on models.
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Affiliation(s)
- R J W Brienen
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - O L Phillips
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - T R Feldpausch
- 1] School of Geography, University of Leeds, Leeds LS2 9JT, UK. [2] Geography, College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter EX4 4RJ, UK
| | - E Gloor
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - T R Baker
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - J Lloyd
- 1] Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot, Berkshire SL5 7PY, UK. [2] School of Marine and Tropical Biology, James Cook University, Cairns, 4870 Queenland, Australia
| | | | - A Monteagudo-Mendoza
- Jardín Botánico de Missouri, Prolongacion Bolognesi Mz.e, Lote 6, Oxapampa, Pasco, Peru
| | - Y Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QK, UK
| | - S L Lewis
- 1] School of Geography, University of Leeds, Leeds LS2 9JT, UK. [2] Department of Geography, University College London, Pearson Building, Gower Street, London WC1E 6BT, UK
| | - R Vásquez Martinez
- Jardín Botánico de Missouri, Prolongacion Bolognesi Mz.e, Lote 6, Oxapampa, Pasco, Peru
| | - M Alexiades
- School of Anthropology and Conservation, Marlowe Building, University of Kent, Canterbury CT1 3EH, UK
| | - E Álvarez Dávila
- Servicios Ecosistemicos y Cambio Climático, Jardín Botánico de Medellín, Calle 73 no. 51 D-14, C.P. 050010, Medellín, Colombia
| | - P Alvarez-Loayza
- Center for Tropical Conservation, Duke University, Box 90381, Durham, North Carolina 27708, USA
| | - A Andrade
- Biological Dynamics of Forest Fragment Project (INPA &STRI), C.P. 478, Manaus AM 69011-970, Brazil
| | - L E O C Aragão
- 1] Geography, College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter EX4 4RJ, UK. [2] National Institute for Space Research (INPE), Av. Dos Astronautas, 1758, São José dos Campos, São Paulo 12227-010, Brazil
| | - A Araujo-Murakami
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autonoma Gabriel Rene Moreno, Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - E J M M Arets
- Alterra, Wageningen University and Research Centre, PO Box 47, 6700 AA Wageningen, The Netherlands
| | - L Arroyo
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autonoma Gabriel Rene Moreno, Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - G A Aymard C
- UNELLEZ-Guanare, Programa de Ciencias del Agro y el Mar, Herbario Universitario (PORT), Mesa de Cavacas, Estado Portuguesa, 3350 Venezuela
| | - O S Bánki
- Biodiversiteit en Ecosysteem Dynamica, University of Amsterdam, Postbus 94248, 1090 GE Amsterdam, The Netherlands
| | - C Baraloto
- 1] Institut National de la Recherche Agronomique, UMR EcoFoG, Campus Agronomique, 97310 Kourou, French Guiana. [2] International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, Florida 33199, USA
| | - J Barroso
- Universidade Federal do Acre, Campus de Cruzeiro do Sul, Rio Branco, Brazil
| | - D Bonal
- INRA, UMR 1137 ''Ecologie et Ecophysiologie Forestiere'' 54280 Champenoux, France
| | - R G A Boot
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - J L C Camargo
- Biological Dynamics of Forest Fragment Project (INPA &STRI), C.P. 478, Manaus AM 69011-970, Brazil
| | - C V Castilho
- Embrapa Roraima, Caixa Postal 133, Boa Vista, RR, CEP 69301-970, Brazil
| | - V Chama
- Universidad Nacional San Antonio Abad del Cusco, Av. de la Cultura N° 733, Cusco, Peru
| | - K J Chao
- 1] School of Geography, University of Leeds, Leeds LS2 9JT, UK. [2] International Master Program of Agriculture, College of Agriculture and Natural Resources, National Chung Hsing University, Taichung 40227, Taiwan
| | - J Chave
- Université Paul Sabatier CNRS, UMR 5174 Evolution et Diversité Biologique, Bâtiment 4R1, 31062 Toulouse, France
| | - J A Comiskey
- Northeast Region Inventory and Monitoring Program, National Park Service, 120 Chatham Lane, Fredericksburg, Virginia 22405, USA
| | - F Cornejo Valverde
- Andes to Amazon Biodiversity Program, Puerto Maldonado, Madre de Dios, Peru
| | - L da Costa
- Universidade Federal do Para, Centro de Geociencias, Belem, CEP 66017-970 Para, Brazil
| | - E A de Oliveira
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina MT, Brazil
| | - A Di Fiore
- Department of Anthropology, University of Texas at Austin, SAC Room 5.150, 2201 Speedway Stop C3200, Austin, Texas 78712, USA
| | - T L Erwin
- Department of Entomology, Smithsonian Institution, PO Box 37012, MRC 187, Washington DC 20013-7012, USA
| | - S Fauset
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - M Forsthofer
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina MT, Brazil
| | - D R Galbraith
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - E S Grahame
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - N Groot
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - B Hérault
- Cirad, UMR Ecologie des Forêts de Guyane, Campus Agronomique, 97310 Kourou, French Guiana
| | - N Higuchi
- Biological Dynamics of Forest Fragment Project (INPA &STRI), C.P. 478, Manaus AM 69011-970, Brazil
| | - E N Honorio Coronado
- 1] School of Geography, University of Leeds, Leeds LS2 9JT, UK. [2] Instituto de Investigaciones de la Amazonía Peruana, Av. A. José Quiñones km 2.5, Iquitos, Peru
| | - H Keeling
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - T J Killeen
- World Wildlife Fund, 1250 24th Street NW, Washington DC 20037, USA
| | - W F Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and School of Marine and Environmental Sciences, James Cook University, Cairns, Queensland 4878, Australia
| | - S Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and School of Marine and Environmental Sciences, James Cook University, Cairns, Queensland 4878, Australia
| | - J Licona
- Instituto Boliviano de Investigación Forestal, C.P. 6201, Santa Cruz de la Sierra, Bolivia
| | - W E Magnussen
- National Institute for Research in Amazonia (INPA), C.P. 478, Manaus, Amazonas, CEP 69011-970, Brazil
| | - B S Marimon
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina MT, Brazil
| | - B H Marimon-Junior
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina MT, Brazil
| | - C Mendoza
- 1] FOMABO, Manejo Forestal en las Tierras Tropicales de Bolivia, Sacta, Bolivia. [2] Escuela de Ciencias Forestales (ESFOR), Universidad Mayor de San Simón (UMSS), Sacta, Bolivia
| | - D A Neill
- Universidad Estatal Amazónica, Facultad de Ingeniería Ambiental, Paso lateral km 2 1/2 via Napo, Puyo, Pastaza, Ecuador
| | - E M Nogueira
- National Institute for Research in Amazonia (INPA), C.P. 2223, 69080-971, Manaus, Amazonas, Brazil
| | - P Núñez
- Universidad Nacional San Antonio Abad del Cusco, Av. de la Cultura N° 733, Cusco, Peru
| | - N C Pallqui Camacho
- Universidad Nacional San Antonio Abad del Cusco, Av. de la Cultura N° 733, Cusco, Peru
| | - A Parada
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autonoma Gabriel Rene Moreno, Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - G Pardo-Molina
- Universidad Autonoma del Beni, Campus Universitario, Av. Ejército Nacional, Riberalta, Beni, Bolivia
| | - J Peacock
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - M Peña-Claros
- 1] Instituto Boliviano de Investigación Forestal, C.P. 6201, Santa Cruz de la Sierra, Bolivia. [2] Forest Ecology and Forest Management Group, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
| | - G C Pickavance
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - N C A Pitman
- 1] Center for Tropical Conservation, Duke University, Box 90381, Durham, North Carolina 27708, USA. [2] The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605-2496, USA
| | - L Poorter
- Forest Ecology and Forest Management Group, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
| | - A Prieto
- Universidad Nacional de la Amazonía Peruana, Iquitos, Loreto, Peru
| | - C A Quesada
- National Institute for Research in Amazonia (INPA), C.P. 2223, 69080-971, Manaus, Amazonas, Brazil
| | - F Ramírez
- Universidad Nacional de la Amazonía Peruana, Iquitos, Loreto, Peru
| | - H Ramírez-Angulo
- Instituto de Investigaciones para el Desarrollo Forestal (INDEFOR), Universidad de Los Andes, Facultad de Ciencias Forestales y Ambientales, Conjunto Forestal, C.P. 5101, Mérida, Venezuela
| | - Z Restrepo
- Servicios Ecosistemicos y Cambio Climático, Jardín Botánico de Medellín, Calle 73 no. 51 D-14, C.P. 050010, Medellín, Colombia
| | - A Roopsind
- Iwokrama International Centre for Rainforest Conservation and Development, 77 High Street Kingston, Georgetown, Guyana
| | - A Rudas
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - R P Salomão
- Museu Paraense Emilio Goeldi, Av. Magalhães Barata, 376 - São Braz, CEP 66040-170, Belém PA, Brazil
| | - M Schwarz
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - N Silva
- UFRA, Av. Presidente Tancredo Neves 2501, CEP 66.077-901, Belém, Pará, Brazil
| | - J E Silva-Espejo
- Universidad Nacional San Antonio Abad del Cusco, Av. de la Cultura N° 733, Cusco, Peru
| | - M Silveira
- Museu Universitário, Universidade Federal do Acre, Rio Branco AC 69910-900, Brazil
| | - J Stropp
- European Commission - DG Joint Research Centre, Institute for Environment and Sustainability, Via Enrico Fermi 274, 21010 Ispra, Italy
| | - J Talbot
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - H ter Steege
- 1] Naturalis Biodiversity Center, PO Box, 2300 RA, Leiden, The Netherlands. [2] Ecology and Biodiversity Group, Utrecht University, PO Box 80084, 3508 TB Utrecht, The Netherlands
| | - J Teran-Aguilar
- Museo de Historia Natural Alcide D'Orbigny, Av. Potosi no 1458, Cochabamba, Bolivia
| | - J Terborgh
- Center for Tropical Conservation, Duke University, Box 90381, Durham, North Carolina 27708, USA
| | - R Thomas-Caesar
- UFRA, Av. Presidente Tancredo Neves 2501, CEP 66.077-901, Belém, Pará, Brazil
| | - M Toledo
- Instituto Boliviano de Investigación Forestal, C.P. 6201, Santa Cruz de la Sierra, Bolivia
| | - M Torello-Raventos
- 1] School of Earth and Environmental Science, James Cook University, Cairns, Queensland 4870, Australia. [2] Centre for Tropical Environmental and Sustainability Science (TESS) and School of Marine and Tropical Biology, James Cook University, Cairns, Queensland 4878, Australia
| | - R K Umetsu
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina MT, Brazil
| | - G M F van der Heijden
- 1] Northumbria University, School of Geography, Ellison Place, Newcastle upon Tyne, Newcastle NE1 8ST, UK. [2] University of Wisconsin, Milwaukee, Wisconsin 53202, USA. [3] Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Panamá, Republic of Panama
| | - P van der Hout
- Van der Hout Forestry Consulting, Jan Trooststraat 6, 3078 HP Rotterdam, The Netherlands
| | - I C Guimarães Vieira
- Museu Paraense Emilio Goeldi, Av. Magalhães Barata, 376 - São Braz, CEP 66040-170, Belém PA, Brazil
| | - S A Vieira
- Universidade Estadual de Campinas, NEPAM, Rua dos Flamboyants, 155- Cidade Universitária Zeferino Vaz, Campinas, CEP 13083-867, Sao Paulo, Brazil
| | - E Vilanova
- Instituto de Investigaciones para el Desarrollo Forestal (INDEFOR), Universidad de Los Andes, Facultad de Ciencias Forestales y Ambientales, Conjunto Forestal, C.P. 5101, Mérida, Venezuela
| | - V A Vos
- 1] Universidad Autonoma del Beni, Campus Universitario, Av. Ejército Nacional, Riberalta, Beni, Bolivia. [2] Centro de Investigación y Promoción del Campesinado, regional Norte Amazónico, C/ Nicanor Gonzalo Salvatierra N° 362, Casilla 16, Riberalta, Bolivia
| | - R J Zagt
- Tropenbos International, PO Box 232, 6700 AE Wageningen, The Netherlands
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Doughty CE, Metcalfe DB, Girardin CAJ, Amézquita FF, Cabrera DG, Huasco WH, Silva-Espejo JE, Araujo-Murakami A, da Costa MC, Rocha W, Feldpausch TR, Mendoza ALM, da Costa ACL, Meir P, Phillips OL, Malhi Y. Drought impact on forest carbon dynamics and fluxes in Amazonia. Nature 2015; 519:78-82. [DOI: 10.1038/nature14213] [Citation(s) in RCA: 364] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 12/22/2014] [Indexed: 11/09/2022]
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Román-Cuesta RM, Carmona-Moreno C, Lizcano G, New M, Silman M, Knoke T, Malhi Y, Oliveras I, Asbjornsen H, Vuille M. Synchronous fire activity in the tropical high Andes: an indication of regional climate forcing. Glob Chang Biol 2014; 20:1929-1942. [PMID: 24464954 DOI: 10.1111/gcb.12538] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 11/27/2013] [Indexed: 06/03/2023]
Abstract
Global climate models suggest enhanced warming of the tropical mid and upper troposphere, with larger temperature rise rates at higher elevations. Changes in fire activity are amongst the most significant ecological consequences of rising temperatures and changing hydrological properties in mountainous ecosystems, and there is a global evidence of increased fire activity with elevation. Whilst fire research has become popular in the tropical lowlands, much less is known of the tropical high Andean region (>2000 masl, from Colombia to Bolivia). This study examines fire trends in the high Andes for three ecosystems, the Puna, the Paramo and the Yungas, for the period 1982-2006. We pose three questions: (i) is there an increased fire response with elevation? (ii) does the El Niño- Southern Oscillation control fire activity in this region? (iii) are the observed fire trends human driven (e.g., human practices and their effects on fuel build-up) or climate driven? We did not find evidence of increased fire activity with elevation but, instead, a quasicyclic and synchronous fire response in Ecuador, Peru and Bolivia, suggesting the influence of high-frequency climate forcing on fire responses on a subcontinental scale, in the high Andes. ENSO variability did not show a significant relation to fire activity for these three countries, partly because ENSO variability did not significantly relate to precipitation extremes, although it strongly did to temperature extremes. Whilst ENSO did not individually lead the observed regional fire trends, our results suggest a climate influence on fire activity, mainly through a sawtooth pattern of precipitation (increased rainfall before fire-peak seasons (t-1) followed by drought spells and unusual low temperatures (t0), which is particularly common where fire is carried by low fuel loads (e.g., grasslands and fine fuel). This climatic sawtooth appeared as the main driver of fire trends, above local human influences and fuel build-up cyclicity.
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Affiliation(s)
- R M Román-Cuesta
- CREAF. Centre for Ecological Research and Forestry Applications, Facultat de Ciencies. Unitat d' Ecologia Universitat Autonoma de Barcelona, Bellaterra, Barcelona, 08193, Spain; Institute of Forest Management, Technische Universität München, Center of Life and Food Sciences Weihenstephan, Hans-Carl-von-Carlowitz-Platz 2, Freising, 85354, Germany
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De Barros AE, MacDonald EA, Matsumoto MH, Paula RC, Nijhawan S, Malhi Y, MacDonald DW. Identification of areas in Brazil that optimize conservation of forest carbon, jaguars, and biodiversity. Conserv Biol 2014; 28:580-593. [PMID: 24372997 DOI: 10.1111/cobi.12202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2012] [Accepted: 06/30/2013] [Indexed: 06/03/2023]
Abstract
A major question in global environmental policy is whether schemes to reduce carbon pollution through forest management, such as Reducing Emissions from Deforestation and Degradation (REDD+), can also benefit biodiversity conservation in tropical countries. We identified municipalities in Brazil that are priorities for reducing rates of deforestation and thus preserving carbon stocks that are also conservation targets for the endangered jaguar (Panthera onca) and biodiversity in general. Preliminary statistical analysis showed that municipalities with high biodiversity were positively associated with high forest carbon stocks. We used a multicriteria decision analysis to identify municipalities that offered the best opportunities for the conservation of forest carbon stocks and biodiversity conservation under a range of scenarios with different rates of deforestation and carbon values. We further categorized these areas by their representativeness of the entire country (through measures such as percent forest cover) and an indirect measure of cost (number of municipalities). The municipalities that offered optimal co-benefits for forest carbon stocks and conservation were termed REDDspots (n = 159), and their spatial distribution was compared with the distribution of current and proposed REDD projects (n = 135). We defined REDDspots as the municipalities that offer the best opportunities for co-benefits between the conservation of forest carbon stocks, jaguars, and other wildlife. These areas coincided in 25% (n = 40) of municipalities. We identified a further 95 municipalities that may have the greatest potential to develop additional REDD+ projects while also targeting biodiversity conservation. We concluded that REDD+ strategies could be an efficient tool for biodiversity conservation in key locations, especially in Amazonian and Atlantic Forest biomes.
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Affiliation(s)
- Alan E De Barros
- Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, The Recanati-Kaplan Centre, Tubney House, Tubney, Oxford, OX13 5QL, United Kingdom
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Rowland L, Malhi Y, Silva-Espejo JE, Farfán-Amézquita F, Halladay K, Doughty CE, Meir P, Phillips OL. The sensitivity of wood production to seasonal and interannual variations in climate in a lowland Amazonian rainforest. Oecologia 2013; 174:295-306. [PMID: 24026500 DOI: 10.1007/s00442-013-2766-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Accepted: 08/29/2013] [Indexed: 10/26/2022]
Abstract
Understanding climatic controls on tropical forest productivity is key to developing more reliable models for predicting how tropical biomes may respond to climate change. Currently there is no consensus on which factors control seasonal changes in tropical forest tree growth. This study reports the first comprehensive plot-level description of the seasonality of growth in a Peruvian tropical forest. We test whether seasonal and interannual variations in climate are correlated with changes in biomass increment, and whether such relationships differ among trees with different functional traits. We found that biomass increments, measured every 3 months on the two plots, were reduced by between 40 and 55% in the peak dry season (July-September) relative to peak wet season (January-March). The seasonal patterns of biomass accumulation are significantly (p < 0.01) associated with seasonal patterns of rainfall and soil water content; however, this may reflect a synchrony of seasonal cycles rather than direct physiological controls on tree growth rates. The strength of the growth seasonality response among trees is significantly correlated to functional traits: consistent with a hypothesised trade-off between maximum potential growth rate and hydraulic safety, tall and fast-growing trees with broad stems had the most strongly seasonal biomass accumulation, suggesting that they are more productive in the wet season, but more vulnerable to water limitation in the dry season.
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Affiliation(s)
- Lucy Rowland
- School of Geosciences, The University of Edinburgh, Edinburgh, UK,
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Vicca S, Luyssaert S, Peñuelas J, Campioli M, Chapin FS, Ciais P, Heinemeyer A, Högberg P, Kutsch WL, Law BE, Malhi Y, Papale D, Piao SL, Reichstein M, Schulze ED, Janssens IA. Fertile forests produce biomass more efficiently. Ecol Lett 2012; 15:520-6. [DOI: 10.1111/j.1461-0248.2012.01775.x] [Citation(s) in RCA: 229] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Salinas N, Malhi Y, Meir P, Silman M, Roman Cuesta R, Huaman J, Salinas D, Huaman V, Gibaja A, Mamani M, Farfan F. The sensitivity of tropical leaf litter decomposition to temperature: results from a large-scale leaf translocation experiment along an elevation gradient in Peruvian forests. New Phytol 2011; 189:967-977. [PMID: 21077887 DOI: 10.1111/j.1469-8137.2010.03521.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
• We present the results from a litter translocation experiment along a 2800-m elevation gradient in Peruvian tropical forests. The understanding of the environmental factors controlling litter decomposition is important in the description of the carbon and nutrient cycles of tropical ecosystems, and in predicting their response to long-term increases in temperature. • Samples of litter from 15 species were transplanted across all five sites in the study, and decomposition was tracked over 448 d. • Species' type had a large influence on the decomposition rate (k), most probably through its influence on leaf quality and morphology. When samples were pooled across species and elevations, soil temperature explained 95% of the variation in the decomposition rate, but no direct relationship was observed with either soil moisture or rainfall. The sensitivity of the decay rate to temperature (κ(T)) varied seven-fold across species, between 0.024 and 0.169 °C⁻¹, with a mean value of 0.118 ± 0.009 °C⁻¹ (SE). This is equivalent to a temperature sensitivity parameter (Q₁₀) for litter decay of 3.06 ± 0.28, higher than that frequently assumed for heterotrophic processes. • Our results suggest that the warming of approx. 0.9 °C experienced in the region in recent decades may have increased decomposition and nutrient mineralization rates by c. 10%.
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Affiliation(s)
- N Salinas
- Environmental Change Institute, School of Geography and the Environment, South Parks Road, Oxford, OX1 3QY, UK
- Universidad Nacional de San Antonio Abad del Cusco, Peru
| | - Y Malhi
- Environmental Change Institute, School of Geography and the Environment, South Parks Road, Oxford, OX1 3QY, UK
| | - P Meir
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | | | - R Roman Cuesta
- Environmental Change Institute, School of Geography and the Environment, South Parks Road, Oxford, OX1 3QY, UK
| | - J Huaman
- Universidad Nacional de San Antonio Abad del Cusco, Peru
| | - D Salinas
- Universidad Nacional de San Antonio Abad del Cusco, Peru
| | - V Huaman
- Universidad Nacional de San Antonio Abad del Cusco, Peru
| | - A Gibaja
- Universidad Nacional de San Antonio Abad del Cusco, Peru
| | - M Mamani
- Universidad Nacional de San Antonio Abad del Cusco, Peru
| | - F Farfan
- Universidad Nacional de San Antonio Abad del Cusco, Peru
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Metcalfe DB, Meir P, Aragão LEOC, Lobo-do-Vale R, Galbraith D, Fisher RA, Chaves MM, Maroco JP, da Costa ACL, de Almeida SS, Braga AP, Gonçalves PHL, de Athaydes J, da Costa M, Portela TTB, de Oliveira AAR, Malhi Y, Williams M. Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon. New Phytol 2010; 187:608-21. [PMID: 20553394 DOI: 10.1111/j.1469-8137.2010.03319.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
*The effects of drought on the Amazon rainforest are potentially large but remain poorly understood. Here, carbon (C) cycling after 5 yr of a large-scale through-fall exclusion (TFE) experiment excluding about 50% of incident rainfall from an eastern Amazon rainforest was compared with a nearby control plot. *Principal C stocks and fluxes were intensively measured in 2005. Additional minor components were either quantified in later site measurements or derived from the available literature. *Total ecosystem respiration (R(eco)) and total plant C expenditure (PCE, the sum of net primary productivity (NPP) and autotrophic respiration (R(auto))), were elevated on the TFE plot relative to the control. The increase in PCE and R(eco) was mainly caused by a rise in R(auto) from foliage and roots. Heterotrophic respiration did not differ substantially between plots. NPP was 2.4 +/- 1.4 t C ha(-1) yr(-1) lower on the TFE than the control. Ecosystem carbon use efficiency, the proportion of PCE invested in NPP, was lower in the TFE plot (0.24 +/- 0.04) than in the control (0.32 +/- 0.04). *Drought caused by the TFE treatment appeared to drive fundamental shifts in ecosystem C cycling with potentially important consequences for long-term forest C storage.
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Affiliation(s)
- D B Metcalfe
- Centre for the Environment, University of Oxford, Oxford, UK.
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Metcalfe DB, Meir P, Aragão LEOC, Malhi Y, da Costa ACL, Braga A, Gonçalves PHL, de Athaydes J, de Almeida SS, Williams M. Factors controlling spatio-temporal variation in carbon dioxide efflux from surface litter, roots, and soil organic matter at four rain forest sites in the eastern Amazon. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2007jg000443] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. B. Metcalfe
- School of Geosciences, Institute of Geography; University of Edinburgh; Edinburgh UK
| | - P. Meir
- School of Geosciences, Institute of Geography; University of Edinburgh; Edinburgh UK
| | | | - Y. Malhi
- Centre for the Environment; University of Oxford; Oxford UK
| | - A. C. L. da Costa
- Universidade Federal do Pará; Centro de Geociencias; Belém, Pará Brazil
| | - A. Braga
- Universidade Federal do Pará; Centro de Geociencias; Belém, Pará Brazil
| | | | - J. de Athaydes
- Universidade Federal do Pará; Centro de Geociencias; Belém, Pará Brazil
| | - S. S. de Almeida
- Museu Paraense Emilio Goeldi; Coordenação de Botânica; Belém, Pará Brazil
| | - M. Williams
- School of Geosciences, Institute of Atmospheric and Environmental Science; University of Edinburgh; Edinburgh UK
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Metcalfe DB, Williams M, Aragão LEOC, Da Costa ACL, De Almeida SS, Braga AP, Gonçalves PHL, De Athaydes J, Junior S, Malhi Y, Meir P. A method for extracting plant roots from soil which facilitates rapid sample processing without compromising measurement accuracy. New Phytol 2007; 174:697-703. [PMID: 17447923 DOI: 10.1111/j.1469-8137.2007.02032.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This study evaluates a novel method for extracting roots from soil samples and applies it to estimate standing crop root mass (+/- confidence intervals) in an eastern Amazon rainforest. Roots were manually extracted from soil cores over a period of 40 min, which was split into 10 min time intervals. The pattern of cumulative extraction over time was used to predict root extraction beyond 40 min. A maximum-likelihood approach was used to calculate confidence intervals. The temporal prediction method added 21-32% to initial estimates of standing crop root mass. According to predictions, complete manual root extraction from 18 samples would have taken c. 239 h, compared with 12 h using the prediction method. Uncertainties (percentage difference between mean, and 10th and 90th percentiles) introduced by the prediction method were small (12-15%), compared with uncertainties caused by spatial variation in root mass (72-191%, for nine samples per plot surveyed). This method provides a way of increasing the number of root samples processed per unit time, without compromising measurement accuracy.
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Affiliation(s)
- D B Metcalfe
- University of Edinburgh, School of Geosciences, Edinburgh, UK
- Swedish University of Agricultural Sciences (SLU), Department of Forest Ecology and Management, Umeå, Sweden
| | - M Williams
- University of Edinburgh, School of Geosciences, Edinburgh, UK
| | - L E O C Aragão
- University of Oxford, Centre for the Environment, Oxford, UK
| | - A C L Da Costa
- Universidade Federal do Pará, Centro de Geociências, Belém, Brazil
| | - S S De Almeida
- Museu Paraense Emilio Goeldi, Coordenação de Botânica, Belém, Brazil
| | - A P Braga
- Universidade Federal do Pará, Centro de Geociências, Belém, Brazil
| | - P H L Gonçalves
- Universidade Federal do Pará, Centro de Geociências, Belém, Brazil
| | - J De Athaydes
- University of Edinburgh, School of Geosciences, Edinburgh, UK
| | - Silva Junior
- Universidade Federal do Pará, Centro de Geociências, Belém, Brazil
| | - Y Malhi
- University of Oxford, Centre for the Environment, Oxford, UK
| | - P Meir
- University of Edinburgh, School of Geosciences, Edinburgh, UK
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Lewis SL, Phillips OL, Baker TR, Lloyd J, Malhi Y, Almeida S, Higuchi N, Laurance WF, Neill DA, Silva JNM, Terborgh J, Lezama AT, Martínez RV, Brown S, Chave J, Kuebler C, Vargas PN, Vinceti B. Concerted changes in tropical forest structure and dynamics: evidence from 50 South American long-term plots. Philos Trans R Soc Lond B Biol Sci 2004; 359:421-36. [PMID: 15212094 PMCID: PMC1693337 DOI: 10.1098/rstb.2003.1431] [Citation(s) in RCA: 216] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Several widespread changes in the ecology of old-growth tropical forests have recently been documented for the late twentieth century, in particular an increase in stem turnover (pan-tropical), and an increase in above-ground biomass (neotropical). Whether these changes are synchronous and whether changes in growth are also occurring is not known. We analysed stand-level changes within 50 long-term monitoring plots from across South America spanning 1971-2002. We show that: (i) basal area (BA: sum of the cross-sectional areas of all trees in a plot) increased significantly over time (by 0.10 +/- 0.04 m2 ha(-1) yr(-1), mean +/- 95% CI); as did both (ii) stand-level BA growth rates (sum of the increments of BA of surviving trees and BA of new trees that recruited into a plot); and (iii) stand-level BA mortality rates (sum of the cross-sectional areas of all trees that died in a plot). Similar patterns were observed on a per-stem basis: (i) stem density (number of stems per hectare; 1 hectare is 10(4) m2) increased significantly over time (0.94 +/- 0.63 stems ha(-1) yr(-1)); as did both (ii) stem recruitment rates; and (iii) stem mortality rates. In relative terms, the pools of BA and stem density increased by 0.38 +/- 0.15% and 0.18 +/- 0.12% yr(-1), respectively. The fluxes into and out of these pools-stand-level BA growth, stand-level BA mortality, stem recruitment and stem mortality rates-increased, in relative terms, by an order of magnitude more. The gain terms (BA growth, stem recruitment) consistently exceeded the loss terms (BA loss, stem mortality) throughout the period, suggesting that whatever process is driving these changes was already acting before the plot network was established. Large long-term increases in stand-level BA growth and simultaneous increases in stand BA and stem density imply a continent-wide increase in resource availability which is increasing net primary productivity and altering forest dynamics. Continent-wide changes in incoming solar radiation, and increases in atmospheric concentrations of CO2 and air temperatures may have increased resource supply over recent decades, thus causing accelerated growth and increased dynamism across the world's largest tract of tropical forest.
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Affiliation(s)
- S L Lewis
- Earth and Biosphere Institute, Geography, University of Leeds, Leeds LS2 9JT, UK.
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Phillips OL, Baker TR, Arroyo L, Higuchi N, Killeen TJ, Laurance WF, Lewis SL, Lloyd J, Malhi Y, Monteagudo A, Neill DA, Vargas PN, Silva JNM, Terborgh J, Martínez RV, Alexiades M, Almeida S, Brown S, Chave J, Comiskey JA, Czimczik CI, Di Fiore A, Erwin T, Kuebler C, Laurance SG, Nascimento HEM, Olivier J, Palacios W, Patiño S, Pitman NCA, Quesada CA, Saldias M, Lezama AT, Vinceti B. Pattern and process in Amazon tree turnover, 1976-2001. Philos Trans R Soc Lond B Biol Sci 2004; 359:381-407. [PMID: 15212092 PMCID: PMC1693333 DOI: 10.1098/rstb.2003.1438] [Citation(s) in RCA: 328] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Previous work has shown that tree turnover, tree biomass and large liana densities have increased in mature tropical forest plots in the late twentieth century. These results point to a concerted shift in forest ecological processes that may already be having significant impacts on terrestrial carbon stocks, fluxes and biodiversity. However, the findings have proved controversial, partly because a rather limited number of permanent plots have been monitored for rather short periods. The aim of this paper is to characterize regional-scale patterns of 'tree turnover' (the rate with which trees die and recruit into a population) by using improved datasets now available for Amazonia that span the past 25 years. Specifically, we assess whether concerted changes in turnover are occurring, and if so whether they are general throughout the Amazon or restricted to one region or environmental zone. In addition, we ask whether they are driven by changes in recruitment, mortality or both. We find that: (i) trees 10 cm or more in diameter recruit and die twice as fast on the richer soils of southern and western Amazonia than on the poorer soils of eastern and central Amazonia; (ii) turnover rates have increased throughout Amazonia over the past two decades; (iii) mortality and recruitment rates have both increased significantly in every region and environmental zone, with the exception of mortality in eastern Amazonia; (iv) recruitment rates have consistently exceeded mortality rates; (v) absolute increases in recruitment and mortality rates are greatest in western Amazonian sites; and (vi) mortality appears to be lagging recruitment at regional scales. These spatial patterns and temporal trends are not caused by obvious artefacts in the data or the analyses. The trends cannot be directly driven by a mortality driver (such as increased drought or fragmentation-related death) because the biomass in these forests has simultaneously increased. Our findings therefore indicate that long-acting and widespread environmental changes are stimulating the growth and productivity of Amazon forests.
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Affiliation(s)
- O L Phillips
- Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds LS2 9JT, UK.
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Phillips OL, Malhi Y, Higuchi N, Laurance WF, Nunez PV, Vasquez RM, Laurance SG, Ferreira LV, Stern M, Brown S, Grace J. Changes in the carbon balance of tropical forests: evidence from long-term plots. Science 1998; 282:439-42. [PMID: 9774263 DOI: 10.1126/science.282.5388.439] [Citation(s) in RCA: 242] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The role of the world's forests as a "sink" for atmospheric carbon dioxide is the subject of active debate. Long-term monitoring of plots in mature humid tropical forests concentrated in South America revealed that biomass gain by tree growth exceeded losses from tree death in 38 of 50 Neotropical sites. These forest plots have accumulated 0.71 ton, plus or minus 0.34 ton, of carbon per hectare per year in recent decades. The data suggest that Neotropical forests may be a significant carbon sink, reducing the rate of increase in atmospheric carbon dioxide.
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Affiliation(s)
- OL Phillips
- O. L. Phillips, School of Geography, University of Leeds, Leeds, LS2 9JT, UK. Y. Malhi and J. Grace, Institute of Ecology and Resource Management, University of Edinburgh, Edinburgh, EH9 3JU, UK. N. Higuchi, Departamento de Silvicultura Tropical
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Grace J, Lloyd J, McIntyre J, Miranda AC, Meir P, Miranda HS, Nobre C, Moncrieff J, Massheder J, Malhi Y, Wright I, Gash J. Carbon Dioxide Uptake by an Undisturbed Tropical Rain Forest in Southwest Amazonia, 1992 to 1993. Science 1995. [DOI: 10.1126/science.270.5237.778] [Citation(s) in RCA: 353] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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