Abstract
Three drought treatments (none, medium and severe) were applied to three container-grown, hybrid poplar clones (Beaupré, Trichobel and Ghoy) as a series of drying cycles over two years-in a greenhouse in 1994 and outside in 1995. Leaf area development, annual biomass production and annual water use were recorded. Clone Beaupré had greater rates of leaf area development (up to 11.8 x 10(-4) m(2) degrees C day(-1)) and subsequently greater dry matter production (up to 816 g tree(-1) year(-1)) and water use (up to 168 l tree(-1) year(-1)) than the other two clones. In all clones, rates of leaf area development, annual biomass production and water use were less under drought conditions than under well-watered conditions. On a proportional basis, the highest reduction in biomass by drought was in Trichobel (up to 74%), whereas, in absolute terms, the reduction was greatest in Beaupré (up to 500 g tree(-1)). However, under drought conditions, annual biomass production was greater in Clone Beaupré than in the other clones. The relationship between water use and biomass production was constant over both years, and was similar for Beaupré and Trichobel at 4.4 g l(-1), but was less for Ghoy at 3.5 g l(-1).
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Claims 10
Claim · model-written summary
Beaupré had greater leaf area development than Trichobel and Ghoy, reaching 11.8 x 10(-4) m(2) degrees C day(-1).
- Material
- Beauprée0
- Outcome
- rates of leaf area developmente0
- Direction
- greatere0
- Value
- 11.8 x 10(-4) m(2) degrees C day(-1)e0
- Comparator
- other two clonese0
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clone Beaupré had greater rates of leaf area development (up to 11.8 x 10(-4) m(2) degrees C day(-1)) and subsequently greater dry matter production (up to 816 g tree(-1) year(-1)) and water use (up to 168 l tree(-1) year(-1)) than the other two clones.”
t0“hybrid poplar”
Claim · model-written summary
Beaupré produced more dry matter than the other clones, up to 816 g tree(-1) year(-1).
- Material
- Beauprée0
- Outcome
- dry matter productione0
- Direction
- greatere0
- Value
- 816 g tree(-1) year(-1)e0
- Comparator
- other two clonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clone Beaupré had greater rates of leaf area development (up to 11.8 x 10(-4) m(2) degrees C day(-1)) and subsequently greater dry matter production (up to 816 g tree(-1) year(-1)) and water use (up to 168 l tree(-1) year(-1)) than the other two clones.”
t0“hybrid poplar”
Claim · model-written summary
Beaupré used more water than the other clones, up to 168 l tree(-1) year(-1).
- Material
- Beauprée0
- Outcome
- water usee0
- Direction
- greatere0
- Value
- 168 l tree(-1) year(-1)e0
- Comparator
- other two clonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clone Beaupré had greater rates of leaf area development (up to 11.8 x 10(-4) m(2) degrees C day(-1)) and subsequently greater dry matter production (up to 816 g tree(-1) year(-1)) and water use (up to 168 l tree(-1) year(-1)) than the other two clones.”
t0“hybrid poplar”
Claim · model-written summary
Drought reduced leaf area development, biomass and water use in all clones relative to well-watered conditions.
- Treatment
- drought conditionse0
- Outcome
- rates of leaf area development, annual biomass production and water usee0
- Direction
- lesse0
- Comparator
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all clones, rates of leaf area development, annual biomass production and water use were less under drought conditions than under well-watered conditions.”
t0“hybrid poplar”
Claim · model-written summary
Trichobel had the largest proportional drought-induced biomass loss, up to 74%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest reduction in biomass by drought was in Trichobel (up to 74%)”
t0“hybrid poplar”
Claim · model-written summary
Beaupré had the largest absolute drought-induced biomass loss, up to 500 g tree(-1).
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction was greatest in Beaupré (up to 500 g tree(-1))”
e1“the highest reduction in biomass by drought was in Trichobel (up to 74%)”
t0“hybrid poplar”
Claim · model-written summary
Under drought, Beaupré produced more annual biomass than the other clones.
- Material
- Beauprée0
- Outcome
- annual biomass productione0
- Direction
- greatere0
- Qualifier
- under drought conditionse0
- Comparator
- other clonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under drought conditions, annual biomass production was greater in Clone Beaupré than in the other clones.”
t0“hybrid poplar”
Claim · model-written summary
Water-use to biomass-production relation remained constant over both years.
- Outcome
- relationship between water use and biomass productione0
- Direction
- constante0
- Setting
- both yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between water use and biomass production was constant over both years”
t0“hybrid poplar”
Claim · model-written summary
Beaupré and Trichobel had similar water-use efficiency of 4.4 g l(-1).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was similar for Beaupré and Trichobel at 4.4 g l(-1)”
t0“hybrid poplar”
Claim · model-written summary
Ghoy had lower water-use efficiency, 3.5 g l(-1).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but was less for Ghoy at 3.5 g l(-1)”
t0“hybrid poplar”
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