Duncan Hull (1996) Bachelor of Science Project (BS303). Supervisors: John H. Tallis and Jac A. Potter
The regulation of CO2 efflux from a sub-arctic heathland
The effects of climatic changes on CO2 efflux from a sub-arctic heathland in Swedish Lappland (Abisko Naturvetenskapliga) were studied using Infra-Red Gas Analysis (IRGA). Climatic changes of increased precipitation and soil temperatures were simulated with open-topped polythene tents and an external water supply. Two complete diel cycles of simulated climatic change and were recorded showing increased CO2 efflux of up to 20% over the control. The results provide evidence to support the hypothesis that increased soil temperature and precipitation could lead to increased CO2 emissions from arctic and sub-arctic ecosystems.
The results are discussed with reference to the availability of soil nutrients as a regulatory factor of CO2 efflux from sub-arctic heathlands.
- Jac A. Potter, Malcolm C. Press, Terry V. Callaghan and John A. Lee. (1995) Growth responses of Polytrichum commune and Hylocomium splendens to simulated environmental change in the sub-arctic.
New Phytologist 131 (4) 533-541. DOI:10.1111/j.1469-8137.1995.tb03089.x (See the acknowledgements section at the end of this paper for an honourable mention of a humble field worker: yours truly. One of the absolut best summer jobs I've ever had!)
- W. D. Billings, J. O. Luken, D. A. Mortensen, K. M. Peterson (1982) Arctic tundra: A source or sink for atmospheric carbon dioxide in a changing environment?
- W. D. Billings, J. O. Luken, D. A. Mortensen, K. M. Peterson (1983) Increasing atmospheric carbon dioxide: possible effects on arctic tundra
Oecologia 58:286 - 289. DOI:10.1007/BF00377129
David S. Jenkinson, D. E. Adams and A. Wild (1991) Model estimates of CO2 emissions from soil in response to global warming
Nature 351(6234):304-306. DOI:10.1038/351304a0
Charles D. Keeling, J.F.S. Chin and T.P.Whorf (1996) Increased activity of northern vegetation inferred from atmospheric CO2 measurements. Nature 382:146-149.. DOI:10.1038/382146a0
Anders Michelsen, Sven Jonasson, Darren Sleep, Mats Havström, Terry V. Callaghan (1996) Shoot biomass, δ13C, nitrogen and chlorophyll responses of two arctic dwarf shrubs to in situ shading, nutrient application and warming simulating climatic change
Oecologia 105:1-12. DOI:10.1007/BF00328785
- Anders Michelsen, Inger K. Schmidt, Sven Jonasson, Chris Quarmby, Darren Sleep (1996) Leaf 15N abundance of subarctic plants provides field evidence that ericoid, ectomycorrhizal and non-and arbuscular mycorrhizal species access different sources of soil nitrogen
Oecologia 105:53-63. DOI:10.1007/BF00328791
- K.J. Nadelhoffer , A.E. Giblin, Gaius R. Shaver and A.E. Linkins. (1992) Microbial processes and plant nutrient availability in arctic soils In
Arctic Ecosystems in a Changing Climate: An Ecophysiological Perspective F. Stuart Chapin III, James F. Reynolds, Ellen W. Chu, Josef Svoboda, Gaius R. Shaver and Robert L. Jefferies. Academic Press, San Diego, CA. pp.281-300
- S. F. Oberbauer, C. T. Gillespie, W. Cheng, R. Gebauer, A. Sala Serra, J. D. Tenhunen (1992) Environmental effects on CO2 efflux from riparian tundra in the northern foothills of the Brooks Range, Alaska, USA
Oecologia 92(4):568-577. DOI:10.1007/BF00317851
Walter C. Oechel, Steven J. Hastings, George Vourlrtis, Mitchell Jenkins, George Riechers and Nancy Grulke. (1993) Recent change of Arctic tundra ecosystems from a net carbon dioxide sink to a source
Nature 361(6412):520-523. DOI:10.1038/361520a0
Andrew N. Parsons, Malcolm C. Press, Philip A. Wookey, J.M. Welker, Clare H. Robinson, Terry V. Callaghan and John A. Lee (1995) Growth-Responses of Calamagrostis lapponica to Simulated Environmental-Change in the Sub-Arctic. Oikos 72(1), 61-66.
- A.F.W. Schimper. (1903) Plant geography upon a physiological basis Clarendon Press, Oxford, UK
- D.B.O. Savile. (1960) Limitations of the Competitive Exclusion Principle
Science 132(3441):1761. DOI:10.1126/science.132.3441.1761