A synthesis: The role of nutrients as constraints on carbon balances in boreal and arctic regions

As in many ecosystems, carbon (C) cycling in arctic and boreal regions is tightly linked to the cycling of nutrients: nutrients (particularly nitrogen) are mineralized through the process of organic matter decomposition (C mineralization), and nutrient availability strongly constrains ecosystem C gain through primary production. This link between C and nutrient cycles has implications for how northern systems will respond to future climate warming and whether feedbacks to rising concentrations of atmospheric CO2 from these regions will be positive or negative. Warming is expected to cause a substantial release of C to the atmosphere because of increased decomposition of the large amounts of organic C present in high-latitude soils (a positive feedback to climate warming). However, increased nutrient mineralization associated with this decomposition is expected to stimulate primary production and ecosystem C gain, offsetting or even exceeding C lost through decomposition (a negative feedback to climate warming). Increased primary production with warming is consistent with results of numerous experiments showing increased plant growth with nutrient enrichment. Here we examine key assumptions behind this scenario: (1) temperature is a primary control of decomposition in northern regions, (2) increased decomposition and associated nutrient release are tightly coupled to plant nutrient uptake, and (3) short-term manipulations of temperature and nutrient availability accurately predict long-term responses to climate change.

[1]  K. Kielland.  Amino Acid Absorption by Arctic Plants: Implications for Plant Nutrition and Nitrogen Cycling , 1994 .

[2]  J. Bryant,et al.  The Plant-Vertebrate Herbivore Interface in Arctic Ecosystems , 1995 .

[3]  Fred L. Bunnell,et al.  An Arctic ecosystem: The Coastal Tundra at Barrow, Alaska , 1980 .

[4]  Wilfred M. Post,et al.  Soil carbon pools and world life zones , 1982, Nature.

[5]  S. Zimov,et al.  Winter biotic activity and production of CO2 in Siberian soils : a factor in the greenhouse effect , 1993 .

[6]  H. Nohrstedt.  Nonsymbiotic nitrogen fixation in the topsoil of some forest stands in central Sweden , 1985 .

[7]  D. Mortensen,et al.  Arctic tundra: A source or sink for atmospheric carbon dioxide in a changing environment? , 1982, Oecologia.

[8]  E. A. Clark,et al.  Plant Functional Types. Their Relevance to Ecosystem Properties and Global Change , 1998 .

[9]  Russian Federation..  Wintertime CO2 Emission from Soils of Northeastern Siberia , 1993 .

[10]  R. Ruess,et al.  19 – Tundra Grazing Systems and Climatic Change , 1992 .

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

[12]  Björn Berg,et al.  Effect of N deposition on decomposition of plant litter and soil organic matter in forest systems , 1997 .

[13]  F. Stuart Chapin,et al.  Species composition interacts with fertilizer to control long-term change in tundra productivity , 2001 .

[14]  W. Schlesinger.  Biogeochemistry: An Analysis of Global Change , 1991 .

[15]  K. Cleve,et al.  Nitrogen cycling in tundra and boreal ecosystems , 1981 .

[16]  S. Whalen,et al.  Nitrogen, Phosphorus, and Organic Carbon Cycling in an Arctic Lake , 1985 .

[17]  Alastair H. Fitter,et al.  Acidification, nitrogen deposition and rapid vegetational change in a small valley mire in Yorkshire , 1995 .

[18]  F. Stuart Chapin,et al.  Responses of Arctic Tundra to Experimental and Observed Changes in Climate , 1995 .

[19]  S. Hobbie.  Temperature and plant species control over litter decomposition in Alaskan tundra , 1996 .

[20]  F. Chapin,et al.  Preferential use of organic nitrogen for growth by a non-mycorrhizal arctic sedge , 1993, Nature.

[21]  C. Körner,et al.  Arctic and Alpine Biodiversity: Patterns, Causes and Ecosystem Consequences , 1994, Ecological Studies.

[22]  E. Rastetter,et al.  Analysis of CO2, Temperature, and Moisture Effects on Carbon Storage in Alaskan Arctic Tundra Using a General Ecosystem Model , 1997 .

[23]  Edward B. Rastetter,et al.  Global Change and the Carbon Balance of Arctic EcosystemsCarbon/nutrient interactions should act as major constraints on changes in global terrestrial carbon cycling , 1992 .

[24]  K. Nadelhoffer,et al.  Biogeochemical Diversity Along a Riverside Toposequence in Arctic Alaska , 1991 .

[25]  J. Kimble,et al.  Carbon storage along a latitudinal transect in Alaska , 1997, Nutrient Cycling in Agroecosystems.

[26]  P. Grogan,et al.  Arctic Soil Respiration: Effects of Climate and Vegetation Depend on Season , 1999, Ecosystems.

[27]  Will Steffen,et al.  Global change and terrestrial ecosystems. The operational plan. , 1992 .

[28]  W. Oechel,et al.  Landscape-Scale CO 2 , H 2 O Vapour and Energy Flux of Moist-Wet Coastal Tundra Ecosystems over Two Growing Seasons , 1997 .

[29]  E. Rastetter,et al.  BIOMASS AND CO2 FLUX IN WET SEDGE TUNDRAS: RESPONSES TO NUTRIENTS, TEMPERATURE, AND LIGHT , 1998 .

[30]  W. McGill,et al.  Comparative aspects of cycling of organic C, N, S and P through soil organic matter , 1981 .

[31]  T. Callaghan,et al.  In situ mineralization of nitorgen and phosphorus of arctic soils after perturbations simulating climate change , 1993, Oecologia.

[32]  F. Chapin,et al.  Boreal Forest , 2021, Encyclopedic Dictionary of Archaeology.

[33]  B. Stephens,et al.  Winter CO2 fluxes in a boreal forest , 1997 .

[34]  L. C. Bliss,et al.  Tundra ecosystems: a comparative analysis. , 1983 .

[35]  J. Hobbie,et al.  Nitrogen and phosphorus concentrations and export for the upper Kuparuk River on the North Slope of Alaska in 1980 , 1992, Hydrobiologia.

[36]  F. Stuart Chapin,et al.  The Nature of Nutrient Limitation in Plant Communities , 1986, The American Naturalist.

[37]  Sally E Smith and David J Read.  Mycorrhizal Symbiosis 2nd ed , 1997 .

[38]  Knute J. Nadelhoffer,et al.  13 – Microbial Processes and Plant Nutrient Availability in Arctic Soils , 1992 .

[39]  Kawak Ijen Volcano,et al.  Boreal forest plants take up organic nitrogen , 1998 .

[40]  F. Chapin,et al.  CLIMATIC EFFECTS ON TUNDRA CARBON STORAGE INFERRED FROM EXPERIMENTAL DATA AND A MODEL , 1997 .

[41]  K. Nadelhoffer,et al.  Biogeochemical diversity and element transport in a heterogeneous landscape, the north slope of Alaska , 1991 .

[42]  F. S. Chapin,et al.  The Mineral Nutrition of Wild Plants , 1980 .

[43]  S. Trumbore,et al.  Moss and soil contributions to the annual net carbon flux of a maturing boreal forest , 1997 .

[44]  G. Likens,et al.  The biogeochemistry of calcium at Hubbard Brook , 1998 .

[45]  S. Jonasson,et al.  Soil and Plant CO2 Emission in Response to Variations in Soil Moisture and Temperature and to Amendment with Nitrogen, Phosphorus, and Carbon in Northern Scandinavia , 1999 .

[46]  G. Marion,et al.  The Effect of Time and Temperature on Nitrogen Mineralization in Arctic Tundra Soils , 1987 .

[47]  J. Johnstone,et al.  DEVELOPMENTAL PLASTICITY ALLOWS BETULA NANA TO DOMINATE TUNDRA SUBJECTED TO AN ALTERED ENVIRONMENT , 2001 .

[48]  J. Welker,et al.  Wintertime CO2 efflux from Arctic soils: Implications for annual carbon budgets , 1999 .

[49]  K. Nadelhoffer,et al.  EFFECTS OF TEMPERATURE AND SUBSTRATE QUALITY ON ELEMENT MINERALIZATION IN SIX ARCTIC SOILS , 1991 .

[50]  A. Fitter.  Mycorrhizal Symbiosis, 2nd Edn., S.E. Smith, D.J. Read. Academic Press, London, UK (1997), Price £62.50 , 1998 .

[51]  Susan E. Trumbore,et al.  Controls over carbon storage and turnover in high‐latitude soils , 2000, Global change biology.

[52]  A. Michelsen,et al.  Microbial biomass C, N and P in two arctic soils and responses to addition of NPK fertilizer and sugar: implications for plant nutrient uptake , 1996, Oecologia.

[53]  Karen Updegraff,et al.  CARBON, NITROGEN, AND PHOSPHORUS MINERALIZATION IN NORTHERN WETLANDS , 1998 .

[54]  E. Gorham.  Northern Peatlands: Role in the Carbon Cycle and Probable Responses to Climatic Warming. , 1991, Ecological applications : a publication of the Ecological Society of America.

[55]  R. Mäkipää.  Effect of nitrogen input on carbon accumulation of boreal forest soils and ground vegetation , 1995 .

[56]  F. Chapin,et al.  Physiological and Growth Responses of Arctic Plants to a Field Experiment Simulating Climatic Change , 1996 .

[57]  Nils Chr. Stenseth,et al.  Ecosystem consequences of wolf behavioural response to climate , 1999, Nature.

[58]  Paul A. Keddy,et al.  North American Terrestrial Vegetation , 1988 .

[59]  D. Elliott-Fisk.  The boreal forest , 1988 .

[60]  G. Shaver.  Plant functional types and ecosystem change in arctic tundras , 1997 .

[61]  James A. Larsen,et al.  The Boreal Ecosystem , 1981 .

[62]  Björn Berg,et al.  Litter decomposition and organic matter turnover in northern forest soils , 2000 .

[63]  F. Chapin,et al.  Production: Biomass Relationships and Element Cycling in Contrasting Arctic Vegetation Types , 1991 .

[64]  Yosef Cohen,et al.  MOOSE BROWSING AND SOIL FERTILITY IN THE BOREAL FORESTS OF ISLE ROYALE NATIONAL PARK , 1993 .

[65]  S. Zimov,et al.  Wintertime CO2 Emission from Soils of Northeastern Siberia , 1993 .

[66]  F. Chapin,et al.  RECONSTRUCTION AND ANALYSIS OF HISTORICAL CHANGES IN CARBON STORAGE IN ARCTIC TUNDRA , 1997 .

[67]  Michael G. Ryan,et al.  Age-Related Decline in Forest Productivity: Pattern and Process , 1997 .

[68]  Li-Quan Zhang,et al.  Effects of experimental acidification, nitrogen addition and liming on ground vegetation in a mature stand of Norway spruce (Picea abies (L.) Karst.) in SE Sweden , 1998 .

[69]  C.,et al.  Carbon and Nutrient Budgets and Their Control in Coastal Tundra , 2004 .

[70]  W. Oechel,et al.  Cold season CO2 emission from Arctic soils , 1997 .

[71]  C. Bledsoe,et al.  14 – Nitrogen Fixation in Arctic Plant Communities , 1992 .

[72]  E. Kasischke,et al.  Fire, Global Warming, and the Carbon Balance of Boreal Forests , 1995 .

[73]  W. Post,et al.  Successional changes in nitrogen availability as a potential factor contributing to spruce declines in boreal North America , 1987 .

[74]  Peter M. Vitousek,et al.  Ecosystem Succession and Nutrient Retention: A Hypothesis , 1975 .

[75]  E. Schulze,et al.  Air Pollution and Forest Decline in a Spruce (Picea abies) Forest , 1989, Science.

[76]  L. Högbom,et al.  Shoot nitrate reductase activities of field‐layer species in different forest types: I. Preliminary surveys in Northern Sweden , 1990 .

[77]  D. Binkley,et al.  Nutrient supply and declines in leaf area and production in lodgepole pine , 1995 .

[78]  A. Lachenbruch,et al.  Changing Climate: Geothermal Evidence from Permafrost in the Alaskan Arctic , 1986, Science.