Re-evaluation of forest biomass carbon stocks and lessons from the world's most carbon-dense forests

From analysis of published global site biomass data (n = 136) from primary forests, we discovered (i) the world's highest known total biomass carbon density (living plus dead) of 1,867 tonnes carbon per ha (average value from 13 sites) occurs in Australian temperate moist Eucalyptus regnans forests, and (ii) average values of the global site biomass data were higher for sampled temperate moist forests (n = 44) than for sampled tropical (n = 36) and boreal (n = 52) forests (n is number of sites per forest biome). Spatially averaged Intergovernmental Panel on Climate Change biome default values are lower than our average site values for temperate moist forests, because the temperate biome contains a diversity of forest ecosystem types that support a range of mature carbon stocks or have a long land-use history with reduced carbon stocks. We describe a framework for identifying forests important for carbon storage based on the factors that account for high biomass carbon densities, including (i) relatively cool temperatures and moderately high precipitation producing rates of fast growth but slow decomposition, and (ii) older forests that are often multiaged and multilayered and have experienced minimal human disturbance. Our results are relevant to negotiations under the United Nations Framework Convention on Climate Change regarding forest conservation, management, and restoration. Conserving forests with large stocks of biomass from deforestation and degradation avoids significant carbon emissions to the atmosphere, irrespective of the source country, and should be among allowable mitigation activities. Similarly, management that allows restoration of a forest's carbon sequestration potential also should be recognized.

[1]  P. Sands.  The United Nations Framework Convention on Climate Change , 1992 .

[2]  A. Gill,et al.  Fire regimes in mountain ash forest: evidence from forest age structure, extinction models and wildlife habitat , 1999 .

[3]  Andrew E. Suyker,et al.  Estimation of net ecosystem carbon exchange for the conterminous United States by combining MODIS and AmeriFlux data , 2008, Agricultural and Forest Meteorology.

[4]  D. H. Knight,et al.  Coarse Woody Debris following Fire and Logging in Wyoming Lodgepole Pine Forests , 2000, Ecosystems.

[5]  Shuguang Liu,et al.  Old-Growth Forests Can Accumulate Carbon in Soils , 2006, Science.

[6]  Unfccc.  Kyoto Protocol to the United Nations Framework Convention on Climate Change , 1997 .

[7]  R. Keane,et al.  Ecophysiological parameters for Pacific Northwest trees. , 2004 .

[8]  F. Wagner,et al.  Good Practice Guidance for Land Use, Land-Use Change and Forestry , 2003 .

[9]  Sean C. Thomas,et al.  Increasing carbon storage in intact African tropical forests , 2009, Nature.

[10]  D. Bryant,et al.  Last Frontier Forests , 1997 .

[11]  R. Pachauri.  Climate change 2007. Synthesis report. Contribution of Working Groups I, II and III to the fourth assessment report , 2008 .

[12]  O. Phillips,et al.  The changing Amazon forest , 2008, Philosophical Transactions of the Royal Society B: Biological Sciences.

[13]  Thomas M. Smith,et al.  A global land primary productivity and phytogeography model , 1995 .

[14]  H. Saito,et al.  Biomass and primary production in forests of three major vegetation zones of the northwestern United States. , 1976 .

[15]  A. I. Gitelman,et al.  Variability in net primary production and carbon storage in biomass across Oregon forests—an assessment integrating data from forest inventories, intensive sites, and remote sensing , 2005 .

[16]  Jerry F. Franklin,et al.  POTENTIAL UPPER BOUNDS OF CARBON STORES IN FORESTS OF THE PACIFIC NORTHWEST , 2002 .

[17]  Ü. Rannik,et al.  Respiration as the main determinant of carbon balance in European forests , 2000, Nature.

[18]  D. Ashton.  The root and shoot development of Eucalyptus regnans F. Muell. , 1975 .

[19]  L. Greene.  EHPnet: United Nations Framework Convention on Climate Change , 2000, Environmental Health Perspectives.

[20]  David B. Lindenmayer,et al.  The bioclimatic domains of four species of commercially important eucalypts from south-eastern Australia , 1996 .

[21]  B. Law,et al.  Changes in carbon storage and fluxes in a chronosequence of ponderosa pine , 2003 .

[22]  P. Ciais,et al.  Old-growth forests as global carbon sinks , 2008, Nature.

[23]  Maxwell R. Jacobs,et al.  Growth habits of the Eucalypts. , 1955 .

[24]  J. Means,et al.  Biomass and nutrient content of Douglas-fir logs and other detrital pools in an old-growth forest, Oregon, U.S.A. , 1992 .

[25]  N. Nakicenovic,et al.  Climate change 2007: Mitigation. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Summary for Policymakers. , 2007 .

[26]  B. Mackey,et al.  Forest Conversion and Degradation in Papua New Guinea 1972–2002 , 2009 .

[27]  P. Freer-Smith,et al.  Forestry & climate change , 2007 .

[28]  F. H. Bormann,et al.  Catastrophic disturbance and the steady state in northern hardwood forests , 1979 .

[29]  Susan K. Wiser,et al.  Strategies to estimate national forest carbon stocks from inventory data: the 1990 New Zealand baseline , 2001 .

[30]  Pablo J. Donoso,et al.  Effects of forest type and stand structure on coarse woody debris in old-growth rainforests in the Valdivian Andes, south-central Chile , 2008 .

[31]  K. Prentice.  Bioclimatic distribution of vegetation for general circulation model studies , 1990 .

[32]  R. Houghton,et al.  Aboveground Forest Biomass and the Global Carbon Balance , 2005 .

[33]  C. C. Grier,et al.  Old‐Growth Pseudotsuga menziesii Communities of a Western Oregon Watershed: Biomass Distribution and Production Budgets , 1977 .

[34]  D. Lindenmayer,et al.  Attributes of logs on the floor of Australian Mountain Ash (Eucalyptus regnans) forests of different ages , 1999 .

[35]  S. Alam,et al.  Framework Convention on Climate Change , 1993 .

[36]  W. Silvester,et al.  The biology of kauri (Agathis australis) in New Zealand. I. Production, biomass, carbon storage, and litter fall in four forest remnants , 1999 .

[37]  Stephen H. Roxburgh,et al.  Assessing the carbon sequestration potential of managed forests : a case study from temperate Australia , 2006 .

[38]  M. Harmon,et al.  Ecology of Coarse Woody Debris in Temperate Ecosystems , 1986 .

[39]  Nels Johnson,et al.  The last frontier forests: ecosystems and economies on the edge. What is the status of the worlds remaining large natural forest ecosystems? , 1997 .

[40]  J. Armesto,et al.  Coarse woody debris biomass in successional and primary temperate forests in Chiloé Island, Chile , 2002 .

[41]  Sandra A. Brown,et al.  Aboveground biomass distribution of US eastern hardwood forests and the use of large trees as an indicator of forest development , 1997 .

[42]  J. Means,et al.  Biomass and nutrient content of Douglas-fir logs and other detrital pools in an old-growth forest , 2008 .

[43]  P. Jarvis.  Atmospheric carbon dioxide and forests , 1989 .

[44]  W. Oechel,et al.  Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation , 2002 .

[45]  H. Asbjornsen,et al.  Deep ground fires cause massive above- and below-ground biomass losses in tropical montane cloud forests in Oaxaca, Mexico , 2005, Journal of Tropical Ecology.

[46]  D. Spracklen,et al.  Carbon Mitigation by Biofuels or by Saving and Restoring Forests? , 2007, Science.

[47]  John Harte,et al.  Dead wood biomass and turnover time, measured by radiocarbon, along a subalpine elevation gradient , 2004, Oecologia.

[48]  James S. Clark,et al.  Terrestrial biotic responses to environmental change and feedbacks to climate , 1996 .

[49]  Sandra A. Brown,et al.  Monitoring and estimating tropical forest carbon stocks: making REDD a reality , 2007 .

[50]  David B. Lindenmayer,et al.  A survey design for monitoring the abundance of arboreal marsupials in the Central Highlands of Victoria , 2003 .

[51]  Ernst-Detlef Schulze,et al.  Carbon and Nitrogen Cycling in European Forest Ecosystems , 2000, Ecological Studies.

[52]  Agent-based dynamic modelling of forest ecosystems at the Warra LTER Site , 2001 .

[53]  J. Banks,et al.  How old are Wet Forest understories , 1996 .

[54]  David T. Bell,et al.  Decomposition of woody debris in Western Australian forests , 1996 .

[55]  N. Higuchi,et al.  Decomposition and carbon cycling of dead trees in tropical forests of the central Amazon , 2000, Oecologia.

[56]  David B. Lindenmayer,et al.  Structural features of old-growth Australian montane ash forests. , 2000 .

[57]  H. Lieth.  Modeling the Primary Productivity of the World , 1975 .

[58]  D. Rao,et al.  Potential of wastelands for sequestering carbon by reforestation , 1994 .

[59]  R. Keane,et al.  Are old forests underestimated as global carbon sinks? , 2001 .

[60]  Arthur H. Johnson,et al.  Distribution and cycling of C, N, Ca, Mg, K and P in three pristine, old-growth forests in the Cordillera de Piuchué, Chile , 2002 .

[61]  S. Roxburgh,et al.  Growth modelling of Eucalyptus regnans for carbon accounting at the landscape scale , 2003 .

[62]  Christian Wirth,et al.  Managing Forests After Kyoto , 2000, Science.