Abstract
Abstract To study the influence of elevated CO 2 and nitrogen (N) fertilization on wood properties and energy, Populus × euramericana trees were exposed to ambient CO 2 (about 370 μmol mol −1 CO 2 ) or elevated CO 2 (about 550 μmol mol −1 CO 2 ) using Free Air CO 2 Enrichment (FACE) technology in combination with two N levels. Elevated CO 2 was maintained for 5 years. After three growing seasons, the plantation was coppiced, one half of each experimental plot was fertilized and secondary sprouts were harvested after two growing seasons. Fourier transform infrared (FT‐IR) spectra of wood revealed significant effects of both elevated CO 2 and N fertilization on wood chemistry, in particular, significant increases in lignin and decreases in N content. These results were corroborated by chemical analysis. Neither elevated CO 2 nor N fertilization affected the calorific value of wood, which was 19.3 MJ kg −1 . N fertilization enhanced the energy production per land area by 16–69% because of higher aboveground woody biomass production than on nonfertilized land. Estimates indicate that high yielding poplar short rotation cultivation may significantly contribute as an alternative feedstock for energy production.
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Claims 6
Claim · model-written summary
Elevated CO2 and nitrogen fertilization significantly increased poplar wood lignin.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FT‐IR) spectra of wood revealed significant effects of both elevated CO 2 and N fertilization on wood chemistry, in particular, significant increases in lignin”
t0“poplar short rotation plantation”
Claim · model-written summary
Elevated CO2 and nitrogen fertilization significantly decreased poplar wood nitrogen content.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant increases in lignin and decreases in N content”
t0“poplar short rotation plantation”
Claim · model-written summary
Neither elevated CO2 nor nitrogen fertilization changed wood calorific value.
- Treatment
- elevated CO 2 nor N fertilizatione0
- Outcome
- calorific value of woode0
- Direction
- affectede0
- Value
- 19.3 MJ kg −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither elevated CO 2 nor N fertilization affected the calorific value of wood, which was 19.3 MJ kg −1”
t0“poplar short rotation plantation”
Claim · model-written summary
Nitrogen fertilization enhanced energy production per land area by 16–69%.
- Treatment
- N fertilizatione0
- Outcome
- energy production per land areae0
- Direction
- enhancede0
- Value
- 16–69%e0
- Comparator
- nonfertilized lande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization enhanced the energy production per land area by 16–69% because of higher aboveground woody biomass production than on nonfertilized land”
t0“poplar short rotation plantation”
Claim · model-written summary
Nitrogen fertilization increased aboveground woody biomass production relative to nonfertilized land.
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher aboveground woody biomass production than on nonfertilized land”
t0“poplar short rotation plantation”
Claim · model-written summary
The authors conclude that high yielding short rotation poplar may contribute to energy feedstock production.
- Outcome
- alternative feedstock for energy productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high yielding poplar short rotation cultivation may significantly contribute as an alternative feedstock for energy production”
The same questions in other papers
fertilization · yield · Populus (poplar)Results differ
10 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
10 papers more in this group
See all 14 papers →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.