Could increased boreal forest ecosystem productivity offset carbon losses from increased disturbances?

To understand how boreal forest carbon (C) dynamics might respond to anticipated climatic changes, we must consider two important processes. First, projected climatic changes are expected to increase the frequency of fire and other natural disturbances that would change the forest age-class structure and reduce forest C stocks at the landscape level. Second, global change may result in increased net primary production (NPP). Could higher NPP offset anticipated C losses resulting from increased disturbances? We used the Carbon Budget Model of the Canadian Forest Sector to simulate rate changes in disturbance, growth and decomposition on a hypothetical boreal forest landscape and to explore the impacts of these changes on landscape-level forest C budgets. We found that significant increases in net ecosystem production (NEP) would be required to balance C losses from increased natural disturbance rates. Moreover, increases in NEP would have to be sustained over several decades and be widespread across the landscape. Increased NEP can only be realized when NPP is enhanced relative to heterotrophic respiration. This study indicates that boreal forest C stocks may decline as a result of climate change because it would be difficult for enhanced growth to offset C losses resulting from anticipated increases in disturbances.

[1]  C. Tucker,et al.  Northern hemisphere photosynthetic trends 1982–99 , 2003 .

[2]  T. M. Webb,et al.  The Carbon Budget of the Canadian Forest Sector: Phase I , 1993, Simul..

[3]  J. Régnière,et al.  Impacts of Climate Change on Range Expansion by the Mountain Pine Beetle , 2007 .

[4]  M. Flannigan,et al.  Future Area Burned in Canada , 2005 .

[5]  W. Kurz,et al.  An analysis of future carbon budgets of Canadian boreal forests , 1995 .

[6]  Werner A. Kurz,et al.  A 70-YEAR RETROSPECTIVE ANALYSIS OF CARBON FLUXES IN THE CANADIAN FOREST SECTOR , 1999 .

[7]  John S. Kimball,et al.  Importance of recent shifts in soil thermal dynamics on growing season length, productivity, and carbon sequestration in terrestrial high‐latitude ecosystems , 2006 .

[8]  Christopher B. Field,et al.  FOREST CARBON SINKS IN THE NORTHERN HEMISPHERE , 2002 .

[9]  N. H. Ravindranath,et al.  Land Use, Land-Use Change, and Forestry: A Special Report of the Intergovernmental Panel on Climate Change , 2000 .

[10]  W. Kurz,et al.  Temporal changes of forest net primary production and net ecosystem production in west central Canada associated with natural and anthropogenic disturbances , 2003 .

[11]  W. Kurz,et al.  Carbon Budget Implications of the Transition from Natural to Managed Disturbance Regimes in Forest Landscapes , 1998 .

[12]  Harden,et al.  Sensitivity of boreal forest carbon balance to soil thaw , 1998, Science.

[13]  C. Tucker,et al.  Climate-Driven Increases in Global Terrestrial Net Primary Production from 1982 to 1999 , 2003, Science.

[14]  Sinkyu Kang,et al.  Simulating effects of fire disturbance and climate change on boreal forest productivity and evapotranspiration. , 2006, The Science of the total environment.

[15]  Changhui Peng,et al.  Modelling the response of net primary productivity (NPP) of boreal forest ecosystems to changes in climate and fire disturbance regimes , 1999 .

[16]  Pieter P. Tans,et al.  Boreal ecosystems sequestered more carbon in warmer years , 2006 .

[17]  Will Steffen,et al.  Saturation of the terrestrial carbon sink , 2007 .

[18]  Corinne Le Quéré,et al.  Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks , 2007, Proceedings of the National Academy of Sciences.

[19]  David Rind,et al.  The Impact of a 2 × CO2 Climate on Lightning-Caused Fires , 1994 .

[20]  K. Hirsch,et al.  Large forest fires in Canada, 1959–1997 , 2002 .

[21]  S. Magnussen,et al.  Model-based, volume-to-biomass conversion for forested and vegetated land in Canada , 2007 .

[22]  Kenneth L. Denman Canada.  Couplings between changes in the climate system and biogeochemistry , 2008 .

[23]  S. Matsuoka,et al.  Non-commercial Research and Educational Use including without Limitation Use in Instruction at Your Institution, Sending It to Specific Colleagues That You Know, and Providing a Copy to Your Institution's Administrator. All Other Uses, Reproduction and Distribution, including without Limitation Comm , 2022 .

[24]  C J Tucker,et al.  Drier summers cancel out the CO2 uptake enhancement induced by warmer springs. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[25]  Estimating High Latitude Carbon Fluxes With Inversions Of Atmospheric CO2 , 2006 .

[26]  Bruce P. Finney,et al.  Reduced growth of Alaskan white spruce in the twentieth century from temperature-induced drought stress , 2000, Nature.

[27]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[28]  A. McGuire,et al.  Net Carbon Exchange Across the Arctic Tundra-Boreal Forest Transition in Alaska 1981–2000 , 2006 .

[29]  J. Régnière,et al.  Effect of climate change on range expansion by the mountain pine beetle in British Columbia , 2003 .

[30]  M. Cannell,et al.  Long-term effects of fire frequency on carbon storage and productivity of boreal forests: a modeling study. , 2004, Tree physiology.

[31]  Gert Jan Reinds,et al.  The impact of nitrogen deposition on carbon sequestration in European forests and forest soils , 2006 .

[32]  W. Steffen,et al.  Global Change and the Earth System: A Planet Under Pressure , 2005 .

[33]  Timothy R. Carter,et al.  Future climate in world regions: an intercomparison of model-based projections for the new IPCC emissions scenarios , 2003 .

[34]  Josef Cihlar,et al.  Annual carbon balance of Canada's forests during 1895–1996 , 2000 .

[35]  Marcus C. Sarofim,et al.  CO2 and CH4 exchanges between land ecosystems and the atmosphere in northern high latitudes over the 21st century , 2006 .

[36]  W. Kurz,et al.  Global climatic change: Disturbance regimes and biospheric feedbacks of temperate and boreal forests , 1995 .

[37]  M. Flannigan,et al.  CLIMATE CHANGE AND WILDFIRE IN CANADA , 1991 .

[38]  J. Régnière,et al.  Assessing the Impacts of Global Warming on Forest Pest Dynamics , 2022 .

[39]  C. Tucker,et al.  A large carbon sink in the woody biomass of Northern forests , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[40]  R. Betts,et al.  Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model , 2000, Nature.

[41]  C. Tucker,et al.  Increased plant growth in the northern high latitudes from 1981 to 1991 , 1997, Nature.

[42]  K. Logan,et al.  Simulating the effects of future fire regimes on western Canadian boreal forests , 2003 .

[43]  S. Goetz,et al.  Northern high‐latitude ecosystems respond to climate change , 2007 .

[44]  M. Flannigan,et al.  Forest Fires and Climate Change in the 21ST Century , 2006 .

[45]  C. E. Van Wagner,et al.  Age-class distribution and the forest fire cycle , 1978 .

[46]  E S E U S K I R C H E N,et al.  Importance of recent shifts in soil thermal dynamics on growing season length , productivity , and carbon sequestration in terrestrial high-latitude ecosystems , 2006 .