Fræðaþing landbúnaðarins - 16.02.2007, Page 22

20 • Fræðaþing landbúnaðarins 4, 2007
repens in a permanent pasture. IV. Fine-scale biotic differentiation. Joumal of Ecology, 67, 245-254.
Turkington, R. (1989). The growth, distribution and neighbour relationships of Trifolium repens in a perma-
nent pasture. V. The coevolution of competitors. Joumal of Ecology, 77, 717-733.
Wayne, RM. & F.A. Bazzaz (1997). Light acquisition and growth by competing individuals in C02-enriched
atmosphere: consequences for size stracture in regenerating birch stands. Joumal of Ecology, 85, 29-42.
Wayne, P.M., A.L. Camelli, J. Connolly & F.A. Bazzaz (1999). The density dependence of plant responses
to elevated C02. Joumal of Ecology, 87, 183-192.
Wieneke, S., D. Prati, R. Brandl, J. Stöcklin & H. Auge (2004). Genetic variation in Sanguisorba minor after
6 years in situ selection under elevated C02. Global Change Biology, 10, 1389-1402.
Woodward, F.I., G.B. Thompson & I.F. McKee (1991). The effects of elevated concentrations of carbon
dioxide on individual plants, populations, communities and ecosystems. Annals of Botany, 67, 23-38.
Wright, E., J. Connolly & A. Ltischer (2005). Catch-up in response to elevated C02 - a study of genotypes
of 12 grassland species. Proceedings of the XX. Intemational Grassland Congress, 26th June - lst July
2005, Dublin, Ireland, in press.
Wulff, R.D. & H.M. Alexander (1985). Intraspecific variation in the response to C02 enrichment in seeds
and seedlings of Plantago lanceolata L. Oecologia, 66, 458-460.
Zanetti, S., U.A. Hartwig, A. Líischer, T. Hebeisen, M. Frehner, B.U. Fischer, G.R. Hendrey, H. Blum & J.
Nösberger (1996). Stimulation of symbiotic N2 fixation in Trifolium repens L. under elevated atmospheric
pC02 in a grassland ecosystem. Plant Physiology, 112, 575-583.
Zanetti, S., U.A. Hartwig, C. Van Kessel, A. Luscher, T. Hebeisen, M. Frehner, B.U. Fischer, G.R. Hendrey,
H. Blum & J. Nösberger (1997). Does nitrogen nutrition restrict the C02 response of fertile grassland lack-
ing legumes? Oecologia, 112, 17-25.