Global methane and nitrous oxide emissions from terrestrial ecosystems due to multiple environmental changes

Abstract Greenhouse gas (GHG)‐induced climate change is among the most pressing sustainability challenges facing humanity today, posing serious risks for ecosystem health. Methane (CH4) and nitrous oxide (N2O) are the two most important GHGs after carbon dioxide (CO2), but their regional and global budgets are not well known. In this study, we applied a process‐based coupled biogeochemical model to concurrently estimate the magnitude and spatial and temporal patterns of CH4 and N2O fluxes as driven by multiple environmental changes, including climate variability, rising atmospheric CO2, increasing nitrogen deposition, tropospheric ozone pollution, land use change, and nitrogen fertilizer use. The estimated CH4 and N2O emissions from global land ecosystems during 1981–2010 were 144.39 ± 12.90 Tg C/yr (mean ± 2 SE; 1 Tg = 1012 g) and 12.52 ± 0.74 Tg N/yr, respectively. Our simulations indicated a significant (P < 0.01) annually increasing trend for CH4 (0.43 ± 0.06 Tg C/yr) and N2O (0.14 ± 0.02 Tg N/yr) in the study period. CH4 and N2O emissions increased significantly in most climatic zones and continents, especially in the tropical regions and Asia. The most rapid increase in CH4 emission was found in natural wetlands and rice fields due to increased rice cultivation area and climate warming. N2O emission increased substantially in all the biome types and the largest increase occurred in upland crops due to increasing air temperature and nitrogen fertilizer use. Clearly, the three major GHGs (CH4, N2O, and CO2) should be simultaneously considered when evaluating if a policy is effective to mitigate climate change.

[1]  R. Weiss,et al.  Estimation of regional emissions of nitrous oxide from 1997 to 2005 using multinetwork measurements, a chemical transport model, and an inverse method , 2008 .

[2]  H. Tian,et al.  Effect of nitrogen deposition on China's terrestrial carbon uptake in the context of multifactor environmental changes. , 2012, Ecological applications : a publication of the Ecological Society of America.

[3]  Keith A. Smith,et al.  Global agriculture and nitrous oxide emissions , 2012 .

[4]  H. Tian,et al.  Impacts of climatic and atmospheric changes on carbon dynamics in the Great Smoky Mountains National Park. , 2007, Environmental pollution.

[5]  R. Weiss,et al.  Global and regional emissions estimates for N 2 O , 2012 .

[6]  Greet Janssens-Maenhout,et al.  Emissions of air pollutants and greenhouse gases over Asian regions during 2000–2008: Regional Emission inventory in ASia (REAS) version 2 , 2013 .

[7]  Andrei P. Sokolov,et al.  Rising methane emissions in response to climate change in Northern Eurasia during the 21st century , 2011 .

[8]  Philippe Ciais,et al.  Source attribution of the changes in atmospheric methane for 2006–2008 , 2010 .

[9]  P. Groffman,et al.  Methane uptake in urban forests and lawns. , 2009, Environmental science & technology.

[10]  R. Aerts,et al.  N deposition and elevated CO2 on methane emissions: Differential responses of indirect effects compared to direct effects through litter chemistry feedbacks. , 2010 .

[11]  J. Soussana,et al.  Effects of Climate Change Drivers on Nitrous Oxide Fluxes in an Upland Temperate Grassland , 2011, Ecosystems.

[12]  Robert B. Cook,et al.  The North American Carbon Program Multi-scale Synthesis and Terrestrial Model Intercomparison Project – Part 2: Environmental driver data , 2013 .

[13]  H. Tian,et al.  Net greenhouse gas balance in response to nitrogen enrichment: perspectives from a coupled biogeochemical model , 2013, Global change biology.

[14]  G. L. Hutchinson.  Soil-atmosphere exchange , 2002 .

[15]  W. Parton,et al.  DAYCENT national-scale simulations of nitrous oxide emissions from cropped soils in the United States. , 2006, Journal of environmental quality.

[16]  A. Palojärvi,et al.  Changes in soil microbial community structure under elevated tropospheric O3 and CO2 , 2008 .

[17]  John M. Reilly,et al.  Future Effects of Ozone on Carbon Sequestration and Climate Change Policy Using a Global Biogeochemical Model , 2005 .

[18]  Peter Bergamaschi,et al.  Three decades of global methane sources and sinks , 2013 .

[19]  J. Aber,et al.  Influence of nitrogen fertilization on methane uptake in temperate forest soils , 1989, Nature.

[20]  J. Lelieveld,et al.  A 1°×1° resolution data set of historical anthropogenic trace gas emissions for the period 1890–1990 , 2001 .

[21]  Robert C. Harriss,et al.  Model estimates of nitrous oxide emissions from agricultural lands in the United States , 1996 .

[22]  T. Greaver,et al.  A review of nitrogen enrichment effects on three biogenic GHGs: the CO2 sink may be largely offset by stimulated N2O and CH4 emission. , 2009, Ecology letters.

[23]  H. Tian,et al.  Do nitrogen fertilizers stimulate or inhibit methane emissions from rice fields? , 2012, Global change biology.

[24]  Ronald G. Prinn,et al.  Global modeling of soil nitrous oxide emissions from natural processes , 2013 .

[25]  Peter G. Hess,et al.  Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations , 2011 .

[26]  E. Davidson,et al.  Testing a Conceptual Model of Soil Emissions of Nitrous and Nitric Oxides , 2000 .

[27]  M. Press,et al.  Elevated concentrations of CO2 may double methane emissions from mires , 1995 .

[28]  Atul K. Jain,et al.  Global carbon budget 2013 , 2013 .

[29]  H. Tian,et al.  Convergence in the relationship of CO2 and N2O exchanges between soil and atmosphere within terrestrial ecosystems , 2008 .

[30]  Thomas Kaminski,et al.  Inverse modeling of methane sources and sinks using the adjoint of a global transport model , 1999 .

[31]  Linghao Li,et al.  Methane emission from small wetlands and implications for semiarid region budgets , 2005 .

[32]  P. Ineson,et al.  Soil gas fluxes of N2O, CH4 and CO2 beneath Lolium perenne under elevated CO2: The Swiss free air carbon dioxide enrichment experiment , 2004, Plant and Soil.

[33]  A. Banin,et al.  Global budget of N2O: The role of soils and their change , 1986 .

[34]  H. Tian,et al.  Spatial and temporal patterns of CO2 and CH4 fluxes in China’s croplands in response to multifactor environmental changes , 2011 .

[35]  P. Ambus,et al.  The Effect of Increased N Deposition on Nitrous oxide, Methane and Carbon dioxide Fluxes from Unmanaged Forest and Grassland Communities in Michigan , 2006 .

[36]  B. Hungate,et al.  Effects of interactive global changes on methane uptake in an annual grassland , 2010 .

[37]  P. M. Lang,et al.  Observational constraints on recent increases in the atmospheric CH4 burden , 2009 .

[38]  M. Noguer,et al.  Climate change 2001: The scientific basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change , 2002 .

[39]  H. Tian,et al.  Interactive comment on “ Spatial and temporal patterns of CH 4 and N 2 O fluxes in terrestrial ecosystems of North America during 1979 – 2008 : application of a global biogeochemistry model ” by H , 2022 .

[40]  Yao Huang,et al.  Marshland conversion to cropland in northeast China from 1950 to 2000 reduced the greenhouse effect , 2010 .

[41]  Hanqin Tian,et al.  Impacts of urbanization on carbon balance in terrestrial ecosystems of the Southern United States. , 2012, Environmental pollution.

[42]  W. Parton,et al.  Methane and nitrous oxide fluxes in native, fertilized and cultivated grasslands , 1991, Nature.

[43]  A. Ito,et al.  Use of a process-based model for assessing the methane budgets of global terrestrial ecosystems and evaluation of uncertainty , 2012 .

[44]  M. Liu,et al.  Spatial and temporal patterns of CO2 and CH4 fluxes in China's croplands in response to multifactor environmental changes , 2011 .

[45]  J. Waddington,et al.  Dynamics of biogenic gas bubbles in peat: Potential effects on water storage and peat deformation , 2005 .

[46]  J. Waddington,et al.  Dynamics of biogenic gas bubbles in peat and their effects on peatland biogeochemistry , 2005 .

[47]  J. B. Miller,et al.  Contribution of anthropogenic and natural sources to atmospheric methane variability , 2006, Nature.

[48]  R. Shibasaki,et al.  Modelling a global biogeochemical nitrogen cycle in terrestrial ecosystems , 2000 .

[49]  Catherine Prigent,et al.  An attempt to quantify the impact of changes in wetland extent on methane emissions on the seasonal and interannual time scales , 2010 .

[50]  Tae-Young Goo,et al.  Growth Rate, Seasonal, Synoptic, Diurnal Variations and Budget of Methane in the Lower Atmosphere , 2009 .

[51]  Ronald G. Prinn,et al.  Atmospheric modeling of high‐ and low‐frequency methane observations: Importance of interannually varying transport , 2005 .

[52]  W. Bowden.  Gaseous nitrogen emmissions from undisturbed terrestrial ecosystems: An assessment of their impacts on local and global nitrogen budgets , 1986 .

[53]  H. Tian,et al.  Century-Scale Responses of Ecosystem Carbon Storage and Flux to Multiple Environmental Changes in the Southern United States , 2012, Ecosystems.

[54]  M. Ashmore,et al.  Elevated ozone reduces methane emissions from peatland mesocosms , 2011 .

[55]  Kees Klein Goldewijk,et al.  Long-term dynamic modeling of global population and built-up area in a spatially explicit way: HYDE 3.1 , 2010 .

[56]  P. Döll,et al.  Development and validation of a global database of lakes, reservoirs and wetlands , 2004 .

[57]  K. Yagi,et al.  Global estimations of the inventory and mitigation potential of methane emissions from rice cultivation conducted using the 2006 Intergovernmental Panel on Climate Change Guidelines , 2009 .

[58]  Colm Sweeney,et al.  CarbonTracker-CH 4 : an assimilation system for estimating emissions of atmospheric methane , 2014 .

[59]  L. Verchot,et al.  Opportunities for reducing greenhouse gas emissions in tropical peatlands , 2010, Proceedings of the National Academy of Sciences.

[60]  B. Drake,et al.  Stimulation of methane emission by carbon dioxide enrichment of marsh vegetation , 1994, Nature.

[61]  Robert C. Harriss,et al.  Review and assessment of methane emissions from wetlands , 1993 .

[62]  W. Borken,et al.  Hierarchical control on nitrous oxide emission in forest ecosystems , 1999 .

[63]  W. Parton,et al.  General model for N2O and N2 gas emissions from soils due to dentrification , 2000 .

[64]  H. Tian,et al.  Attribution of spatial and temporal variations in terrestrial methane flux over North America , 2010 .

[65]  Hanqin Tian,et al.  Multifactor controls on terrestrial N 2 O flux over North America from 1979 through 2010 , 2012 .

[66]  Inez Y. Fung,et al.  Methane emission from natural wetlands: Global distribution, area, and environmental characteristics of sources , 1987 .

[67]  P. Groffman,et al.  Snow depth, soil freezing, and fluxes of carbon dioxide, nitrous oxide and methane in a northern hardwood forest , 2006 .

[68]  H. Tian,et al.  North American terrestrial CO2 uptake largely offset by CH4 and N2O emissions: toward a full accounting of the greenhouse gas budget , 2014, Climatic Change.

[69]  Chengquan Huang,et al.  Integrating a process‐based ecosystem model with Landsat imagery to assess impacts of forest disturbance on terrestrial carbon dynamics: Case studies in Alabama and Mississippi , 2013 .

[70]  J. Aber,et al.  Factors controlling atmospheric methane consumption by temperate forest soils , 1995 .

[71]  H. Tian,et al.  Effects of Elevated Carbon Dioxide and Increased Temperature on Methane and Nitrous Oxide Fluxes: Evidence from Field Experiments , 2012 .

[72]  J. Townshend,et al.  Global land cover classifications at 8 km spatial resolution: The use of training data derived from Landsat imagery in decision tree classifiers , 1998 .

[73]  Q. Zhuang,et al.  An inventory of global N2O emissions from the soils of natural terrestrial ecosystems , 2012 .

[74]  R. Betts,et al.  Changes in Atmospheric Constituents and in Radiative Forcing. Chapter 2 , 2007 .

[75]  Derek M. Cunnold,et al.  Atmospheric emissions and trends of nitrous oxide deduced from 10 years of ALE–GAGE data , 1990 .

[76]  C. Nevison,et al.  A global model of changing N2O emissions from natural and perturbed soils , 1996 .

[77]  A. Ridgwell,et al.  Consumption of atmospheric methane by soils: A process‐based model , 1999 .

[78]  N. Batjes,et al.  Modeling global annual N2O and NO emissions from fertilized fields , 2002 .

[79]  H. Tian,et al.  Contemporary and Projected Biogenic Fluxes of Methane and Nitrous Oxide in North American Terrestrial Ecosystems , 2012 .

[80]  Ronald G. Prinn,et al.  Joint Program on the Science and Policy of Global Change Methane Fluxes Between Terrestrial Ecosystems and the Atmosphere at Northern High Latitudes During the Past Century : A Retrospective Analysis with a Process-Based Biogeochemistry Model , 2004 .

[81]  H. Tian,et al.  China's terrestrial carbon balance: Contributions from multiple global change factors , 2011 .

[82]  E. Dlugokencky,et al.  Inverse modeling estimates of the global nitrous oxide surface flux from 1998–2001 , 2006 .

[83]  E. Dlugokencky,et al.  Non-CO2 greenhouse gases and climate change , 2011, Nature.

[84]  Patrick M. Crill,et al.  Timescale dependence of environmental and plant-mediated controls on CH 4 flux in a temper , 2007 .

[85]  Christopher Potter,et al.  Process modeling of controls on nitrogen trace gas emissions from soils worldwide , 1996 .

[86]  W. Salas,et al.  Methane and Nitrous Oxide Emissions from Natural Sources , 2010 .

[87]  H. Tian,et al.  Net exchanges of CO2, CH4, and N2O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming , 2011 .

[88]  Keith A. Smith,et al.  General CH4 oxidation model and comparisons of CH4 Oxidation in natural and managed systems , 2000 .

[89]  Yuexin Liu,et al.  Modeling the emissions of nitrous oxide (N₂O) and methane (CH₄) from the terrestrial biosphere to the atmosphere , 1996 .

[90]  J. Lerner,et al.  Three‐dimensional model synthesis of the global methane cycle , 1991 .

[91]  Michael B. McElroy,et al.  A 3‐D model analysis of the slowdown and interannual variability in the methane growth rate from 1988 to 1997 , 2004 .

[92]  Catherine Prigent,et al.  Present state of global wetland extent and wetland methane modelling: methodology of a model inter-comparison project (WETCHIMP) , 2012 .

[93]  Paul J. Crutzen,et al.  An inverse modeling approach to investigate the global atmospheric methane cycle , 1997 .

[94]  A. McGuire,et al.  Short‐term response of methane fluxes and methanogen activity to water table and soil warming manipulations in an Alaskan peatland , 2008 .

[95]  Changsheng Li,et al.  Quantifying nitrous oxide emissions from Chinese grasslands with a process-based model , 2010 .

[96]  J. Houghton,et al.  Climate change 2001 : the scientific basis , 2001 .

[97]  Benjamin S. Felzer,et al.  Effects of tropospheric ozone pollution on net primary productivity and carbon storage in terrestrial ecosystems of China , 2007 .

[98]  R. Conrad,et al.  Soil microorganisms as controllers of atmospheric trace gases (H2, CO, CH4, OCS, N2O, and NO). , 1996, Microbiological reviews.

[99]  B. Hungate,et al.  Increased soil emissions of potent greenhouse gases under increased atmospheric CO2 , 2011, Nature.

[100]  J. Morgan,et al.  Soil-atmosphere exchange of CH4, CO2, NOx, and N2O in the Colorado shortgrass steppe under elevated CO2 , 2002, Plant and Soil.

[101]  H. Tian,et al.  Ecosystem–atmosphere exchange of CH4 and N2O and ecosystem respiration in wetlands in the Sanjiang Plain, Northeastern China , 2009 .

[102]  J. Waddington,et al.  Ebullition of methane‐containing gas bubbles from near‐surface Sphagnum peat , 2004 .

[103]  K. Butterbach‐Bahl,et al.  Effects of soil temperature and moisture on methane uptake and nitrous oxide emissions across three different ecosystem types , 2013 .

[104]  J. Melillo,et al.  Indirect Emissions from Biofuels: How Important? , 2009, Science.

[105]  Stephen Sitch,et al.  Methane flux from northern wetlands and tundra : An ecosystem source modelling approach , 1996 .

[106]  R. Rasmussen,et al.  Methane and nitrous oxide emissions from subtropical rice agriculture in China , 2008 .

[107]  Hanqin Tian,et al.  Net exchanges of CO2, CH4 and N2O between marshland and the atmosphere in Northeast China as influenced by multiple global environmental changes , 2012 .

[108]  Mingkui Cao,et al.  Global methane emission from wetlands and its sensitivity to climate change , 1998 .

[109]  M. Keller,et al.  Methane and nitrous oxide fluxes in an acid Oxisol in western Puerto Rico : Effects of tillage, liming and fertilization , 1998 .

[110]  John M. Reilly,et al.  Food benefit and climate warming potential of nitrogen fertilizer uses in China , 2012 .

[111]  Benjamin Poulter,et al.  Present state of global wetland extent and wetland methane modelling: conclusions from a model inter-comparison project (WETCHIMP) , 2012 .

[112]  E. Davidson.  The contribution of manure and fertilizer nitrogen to atmospheric nitrous oxide since 1860 , 2009 .