Abstract
Millions of hectares of Eucalyptus are intensively managed for wood production worldwide, but the ecophysiology of resource limitation on growth remains poorly quantified. We investigated the production ecology of a 3.4-to 5.4year-old plantation of clonal Eucalypus grandis x urophylla in northeastern Brazil on a sandy Oxisol during two years (one wet, and one with normal rainfall). We measured wood production and estimated water use (transpired water) in control and irrigated treatments. Water supply limited growth; wood biomass increased from 36.6 Mg ha -1 for both treatments to 107.0 and 141.0 Mg ha -1 after 2 years for the control and irrigated plots. Across both years, irrigation increased wood productivity by 52% (42.8 Mg ha -1 yr -1 versus 28.1 Mg ha -1 yr -1 ). Water use was similar between the control and irrigated treatments during the wet year, but irrigation increased water use by 37% in the normal rainfall year. The efficiency of water use (wood production per m 3 of transpired water) in the control treatment increased from the normal year (1.8 kg wood/m 3 of water) to the wet year (3.2 wood/m 3 of water), and irrigation increased water use efficiency by 18% in the wet year, 75% in the normal year, and 32% across both years. In combination with prior work on water use efficiency across a geographic gradient in rainfall, these irrigation results indicate that increasing water use efficiency should be expected with increasing water use by Eucalyptus.
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Claims 10
Claim · model-written summary
Irrigation increased wood productivity by 52% across both years.
- Taxon
- Eucalyptus
.jpg?width=60)
Eucalyptust0 - Material
- clonal Eucalypus grandis x urophyllae1
- Treatment
- irrigatione2
- Outcome
- wood productivitye2
- Direction
- increasede2
- Value
- 52%e2
- Comparator
- controle4
- Setting
- northeastern Brazile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“a Eucalyptus plantation”
e1“We investigated the production ecology of a 3.4-to 5.4year-old plantation of clonal Eucalypus grandis x urophylla in northeastern Brazil on a sandy Oxisol”
e2“Across both years, irrigation increased wood productivity by 52% (42.8 Mg ha -1 yr -1 versus 28.1 Mg ha -1 yr -1 )”
e4“We measured wood production and estimated water use (transpired water) in control and irrigated treatments”
Claim · model-written summary
Irrigation increased water use by 37% in the normal rainfall year.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- irrigatione5
- Outcome
- water usee5
- Direction
- increasede5
- Value
- 37%e5
- Comparator
- controle5
- Setting
- normal rainfall yeare5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e5“Water use was similar between the control and irrigated treatments during the wet year, but irrigation increased water use by 37% in the normal rainfall year”
Claim · model-written summary
Water use was similar between control and irrigated treatments in the wet year.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- irrigatione5
- Outcome
- water usee5
- Direction
- similare5
- Comparator
- controle5
- Setting
- wet yeare5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e5“Water use was similar between the control and irrigated treatments during the wet year, but irrigation increased water use by 37% in the normal rainfall year”
Claim · model-written summary
Wood biomass in irrigated plots increased from 36.6 Mg ha -1 to 107.0 and 141.0 Mg ha -1 after 2 years.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- irrigated plotse6
- Outcome
- wood biomasse6
- Direction
- increasede6
- Value
- 107.0 and 141.0 Mg ha -1e6
- Comparator
- controle6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e6“wood biomass increased from 36.6 Mg ha -1 for both treatments to 107.0 and 141.0 Mg ha -1 after 2 years for the control and irrigated plots”
Claim · model-written summary
Water supply limited growth of the Eucalyptus plantation.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- Water supplye7
- Outcome
- growthe7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e7“Water supply limited growth”
Claim · model-written summary
Irrigation increased water use efficiency by 18% in the wet year.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- irrigatione3
- Outcome
- water use efficiencye3
- Direction
- increasede3
- Value
- 18%e3
- Comparator
- controle4
- Setting
- wet yeare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e3“and irrigation increased water use efficiency by 18% in the wet year, 75% in the normal year, and 32% across both years”
e4“We measured wood production and estimated water use (transpired water) in control and irrigated treatments”
Claim · model-written summary
Irrigation increased water use efficiency by 75% in the normal year.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- irrigatione3
- Outcome
- water use efficiencye3
- Direction
- increasede3
- Value
- 75%e3
- Comparator
- controle4
- Setting
- normal yeare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e3“and irrigation increased water use efficiency by 18% in the wet year, 75% in the normal year, and 32% across both years”
e4“We measured wood production and estimated water use (transpired water) in control and irrigated treatments”
Claim · model-written summary
Irrigation increased water use efficiency by 32% across both years.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- irrigatione3
- Outcome
- water use efficiencye3
- Direction
- increasede3
- Value
- 32%e3
- Comparator
- controle4
- Setting
- across both yearse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e3“and irrigation increased water use efficiency by 18% in the wet year, 75% in the normal year, and 32% across both years”
e4“We measured wood production and estimated water use (transpired water) in control and irrigated treatments”
Claim · model-written summary
Control-treatment water use efficiency increased from the normal year to the wet year.
- Taxon
- EucalyptusEucalyptust0
- Outcome
- efficiency of water usee0
- Direction
- increasede0
- Value
- 3.2 wood/m 3 of watere0
- Comparator
- normal yeare0
- Setting
- wet yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e0“The efficiency of water use (wood production per m 3 of transpired water) in the control treatment increased from the normal year (1.8 kg wood/m 3 of water) to the wet year (3.2 wood/m 3 of water)”
Claim · model-written summary
Increasing water use efficiency should be expected with increasing water use by Eucalyptus.
- Taxon
- EucalyptusEucalyptust0
- Treatment
- increasing water usee3
- Outcome
- water use efficiencye3
- Direction
- increasinge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Eucalyptus plantation”
e3“increasing water use efficiency should be expected with increasing water use by Eucalyptus”
The same questions in other papers
irrigation · growth · EucalyptusPositive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
4 papers more in this group
See all 8 papers →irrigation · physiology: water · EucalyptusResults agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.