Fræðaþing landbúnaðarins - 16.02.2007, Síða 21

19 • Fræðaþing landbúnaðarins 4, 2007
Change Biology, 6, 655-662.
McNeilly, T. (1981). Ecotypic differentiation in Poa annua: Interpopulation differentiation in response to
competition and cutting. New Phytologist, 88, 539-547.
McNeilly, T. (1984). Ecotypic differentiation in Poa annua - Within population variation in response to
competition and cutting. New Phytologist, 96, 307-316.
Mooney, H.A., J. Canadell, F.S. Chapin, J.R. Ehleringer, C. Kömer, R.E. McMurtrie, W.J. Parton, L.F.
Pitelka & E.D. Schulze (1999). Ecosystem physiology responses to global change. In: B. Walker, W. Stef-
fen, J. Canadell & J. Ingram (eds.) Intemational geosphere - biosphere programme book series. Cambridge
University Press, Cambridge, 141-189.
Morgan, J.A., D.E. Pataki, C. Kömer, H. Clark, S.J. Del Grosso, J.M. Griinzweig, A.K. Knapp, A.R. Mosier,
P.C.D. Newton, P.A. Niklaus, J.B. Nippert, R.S. Nowak, W.J. Parton, H.W. Polley & M.R. Shaw (2004).
Water relations in grassland and desert ecosystems exposed to elevated C02. Oecologia, 140, 11-25.
Newton, P.C.D. (1991). Review: direct effects of increasing carbon dioxide on pasture plants and communi-
ties. New Zealand Joumal of Agricultural Research, 34,1-24.
Norton, L.R., L.G. Firbank & A.R. Watkinson (1995). Ecotypic differentiation ofresponse to enhanced C02
and temperature levels in Arabidopsis thaliana. Oecologia, 104,394-396.
Patterson, D.T. & E.P. Flint (1990). Implications of increasing carbon dioxide and climate change for plant
communities and competition in natural and managed ecosystems. In: Kimball, B.A. (ed.) Impact of Carbon
Dioxide, Trace Gases, and Climate change on Global Agriculture. American Society of Agronomy, Special
Publication 53, Madison, WI, USA, 83-110.
Poorter, H. & M.L. Navas (2003). Plant growth and competition at elevated C02: On winners, losers and
functional groups. New Phytologist, 157, 175-198.
Ramseier, D., J. Connolly & F.A. Bazzaz (2005). Carbon dioxide regime, species identity and influence of
species initial abundance as determinants of change in stand biomass composition in five-species communi-
ties: an investigation using a simplex design and RGRD analysis. Joumal of Ecology, 93, 502-511.
Ross, D.J., P.C.D. Newton & K.R. Tate (2004). Elevated [C02] effects on herbage production and soil car-
bon and nitrogen pools and mineralization in a species-rich, grazed pasture on a seasonally dry sand. Plant
andSoil, 260,183-196.
Schar, C., P.L. Vidale, D. Luthi, C. Frei, C. Haberli, M. Liniger & C. Appenzeller (2004). The role of in-
creasing temperature variability for European summer heat waves. Nature, 427, 332-336.
Schmid, B., A. Birrer & C. Lavigne (1996). Genetic variation in the response of plant populations to el-
evated C02 in a nutrient-poor, calcareous grassland. In: Kömer, C. & F. Bazzaz (eds.) Carbon Dioxide,
Populations, and Communities. Academic Press, San Diego, CA, USA, 31-50.
Schneider, M.K., A. Líischer, M. Richter, U. Aeschlimann, U.A. Hartwig, H. Blum, E. Frossard & J. Nös-
berger (2004). Ten years of free-air C02 enrichment altered the mobilization of N from soil in Lolium
perenne L. swards. Global Change Biology, 10, 1377-1388.
Stinson, K.A, J.H. Tran, J.L. Petzold & F.A. Bazzaz (2006). Architectural and physiological mechanisms
of reduced size inequality in C02-enriched stands of common ragweed (Ambrosia artemisiifolia). Global
Change Biology 12, 1-10.
Stinson, K.A. & F.A. Bazzaz (2006). C02-enrichment reduces reproductive dominance in competing stands
of Ambrosia artemisiifolia (common ragweed). Oecologia, 147, 155-163.
Stöcklin, J., K. Schweizer & C. Kömer (1998). Effects of elevated C02 and phosphoms addition on produc-
tivity and community composition of intact monoliths from calcareous grassland. Oecologia, 116,50-56.
Suter, D., M. Frehner, B.U. Fischer, J. Nösberger & A. Ltischer (2002). Elevated C02 increases carbon al-
location to the roots of Lolium perenne under ffee-air C02 enrichment but not in a controlled environment.
New Phytologist, 154, 65-75.
Turkington, R. & J.L. Harper (1979). The growth, distribution and neighbour relationships of Trifolium