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Does greater night‐time, rather than constant, warming alter growth of managed pasture under under ambient and elevated atmospheric CO 2 ?
- Source :
- New Phytologist. 162:397-411
- Publication Year :
- 2004
- Publisher :
- Wiley, 2004.
-
Abstract
- Summary • This study examined the effects of warming, elevated atmospheric CO 2 and cutting regimen on the growth of Phalaris aquatica cv. Holdfast swards. • Six temperature gradient tunnels (TGT) were used to manipulate both air temperature and atmospheric CO 2 concentrations (ambient and 750 ppm). Within each tunnel, there were three temperature treatments: no warming, constant warming of +3.0 ° C and a daytime warming of 2.2 ° C combined with a night-time warming of 4.0 ° C and two defoliation frequencies. •A veraged across 20 months of growth, there was a positive effect of elevated atmospheric CO 2 (+11%), no effect of either warming treatment and a negative effect of frequent cutting ( − 19%) on total above ground biomass production. The responses to all treatments, however, were strongly seasonal. • Positive responses to CO 2 were statistically significant only in the spring, when plant growth was strongest. No evidence was found that high night-time warming had different effects on plant growth and plant responses to elevated atmospheric CO 2 , than constant warming.
- Subjects :
- Biomass (ecology)
geography
geography.geographical_feature_category
biology
Physiology
Global warming
Plant Science
Seasonality
Phalaris aquatica
biology.organism_classification
medicine.disease
Pasture
chemistry.chemical_compound
Animal science
chemistry
Air temperature
Carbon dioxide
Botany
medicine
Environmental science
Poaceae
Subjects
Details
- ISSN :
- 14698137 and 0028646X
- Volume :
- 162
- Database :
- OpenAIRE
- Journal :
- New Phytologist
- Accession number :
- edsair.doi...........7de8ea85799704bdac8a15a90c78abb5