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- Title
Productivity of Trifolium subterraneum and Phalaris aquatica under warmer, high CO<sub>2</sub> conditions.
- Authors
Lilley, J. M; Bolger, T. P; Gifford, R. M
- Abstract
Summary • Despite the importance of grass-legume pastoral ecosystems worldwide, there is little known about the impacts of concurrent increase in temperature and atmospheric CO2 concentration on their productivity. • Pure and mixed swards of subterranean clover (Trifolium subterraneum ) and phalaris (Phalaris aquatica ) were established under ambient and warmed (+3.4°C) air temperatures, at ambient and 690 µmol mol-1 CO2 concentrations in field tunnels in temperate south-eastern Australia. • Over one year, elevated CO2 increased clover foliage growth in the monoculture by 19%, and by 31% in the mixture. Warming reduced clover monoculture herbage production at ambient CO2 by 28% and reduced the growth enhancement by elevated CO2 to +8%. Forage growth of phalaris monoculture was not affected significantly by either factor. Forage growth of the mixture was increased by 34% in response to higher CO2 , but unaffected by warming. Elevated CO2 combined with warming increased forage growth of the mixed sward by 23%. • Concurrent rise in atmospheric CO2 concentration and temperature increased productivity of subterranean clover-phalaris swards. However, longer term effects on species competition and persistence may modify this conclusion.
- Subjects
CANBERRA (A.C.T.); AUSTRALIA; AUSTRALIAN Capital Territory; LEGUMES; PHYSIOLOGICAL effects of carbon dioxide; SUBTERRANEAN clover
- Publication
New Phytologist, 2001, Vol 150, Issue 2, p371
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1046/j.1469-8137.2001.00108.x