Abstract
The effects of N fertilizer on Corsican pine (Pinusnigra var. maritima (Ait.) Melv.) were studied for 22 years. Basal area increment significantly (p < 0.05) increased in response to N fertilizer for 3, 6, 11, and 13 years after applications ceased, in treatments that received 252, 504, 1008, and 1512 kg N•ha −1 , respectively. Volume increment changed from a quadratic to a linear response to N level during the study period. Overall, the highest rate of N fertilizer increased the aboveground standing biomass by 42%, four-fifths of which occurred in stems. The response of crown components was variable, but there was evidence of a prolonged increase in foliage biomass due to N fertilizer. Initial retention of N within stands was sustained in the longer term, although N distribution altered. These results supported earlier predictions that the growth response to N fertilizer could be sustained through internal cycling, without increasing demands for N uptake from the soil. Increase of N within stands (over and above fertilizer inputs) was similar to estimated rates of atmospheric input, with indirect evidence of a positive feedback between increased foliage biomass and increased levels of N interception by crowns.
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Claims 7
Claim · model-written summary
Basal area increment rose significantly for 3 years at 252 kg N per hectare.
- Taxon
- Corsican pine
Pinus nigra subsp. lariciot0 - Treatment
- N fertilizere0
- Outcome
- Basal area incremente0
- Direction
- increasede0
- Value
- 3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Basal area increment significantly (p < 0.05) increased in response to N fertilizer for 3, 6, 11, and 13 years after applications ceased, in treatments that received 252, 504, 1008, and 1512 kg N•ha −1 , respectively.”
t0“Corsican pine”
Claim · model-written summary
Volume increment changed from a quadratic to linear response to nitrogen level.
- Taxon
- Corsican pinePinus nigra subsp. lariciot0
- Outcome
- Volume incremente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Volume increment changed from a quadratic to a linear response to N level during the study period.”
t0“Corsican pine”
Claim · model-written summary
Highest nitrogen rate increased standing biomass by 42%.
- Taxon
- Corsican pinePinus nigra subsp. lariciot0
- Treatment
- highest rate of N fertilizere0
- Outcome
- aboveground standing biomasse0
- Direction
- increasede0
- Value
- 42%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overall, the highest rate of N fertilizer increased the aboveground standing biomass by 42%, four-fifths of which occurred in stems.”
t0“Corsican pine”
Claim · model-written summary
Four-fifths of the biomass increase occurred in stems.
- Taxon
- Corsican pinePinus nigra subsp. lariciot0
- Outcome
- stemse0
- Value
- four-fifthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four-fifths of which occurred in stems”
t0“Corsican pine”
Claim · model-written summary
Nitrogen fertilizer prolonged the increase in foliage biomass.
- Taxon
- Corsican pinePinus nigra subsp. lariciot0
- Treatment
- N fertilizere0
- Outcome
- foliage biomasse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was evidence of a prolonged increase in foliage biomass due to N fertilizer”
t0“Corsican pine”
Claim · model-written summary
Stand nitrogen retention persisted although distribution changed.
- Taxon
- Corsican pinePinus nigra subsp. lariciot0
- Outcome
- retention of N within standse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initial retention of N within stands was sustained in the longer term, although N distribution altered.”
t0“Corsican pine”
Claim · model-written summary
Stand nitrogen gain beyond fertilizer inputs resembled estimated atmospheric input.
- Taxon
- Corsican pinePinus nigra subsp. lariciot0
- Outcome
- N within standse0
- Direction
- Increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase of N within stands (over and above fertilizer inputs) was similar to estimated rates of atmospheric input”
t0“Corsican pine”
The same questions in other papers
fertilization · growth · Pinus nigra (black pine)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.