Abstract
Fertilizers are applied in drained peatland forests to correct nutrient imbalances, but few models have been developed for predicting the stand growth response. We used 10- to 34-year-long stem growth increment data from 51 fertilization experiments involving ash, PK, and NPK treatments (doses of P, K, and N varying between 35 and 45, 60 and 80, and 80 and 90 kg·ha –1 , respectively) and controls to model the volume growth response of young Scots pine (Pinus sylvetris L.) stands to fertilization in drained peatland sites of middle and northern Finland. We used the linear mixed models method to express the stand-level growth response as a function of time (5-year periods), site type group, location, and the fertilization treatment (ash–PK combined and NPK). Different growth responses were obtained for nitrogen-rich sites with PK treatment and nitrogen-poor sites with NPK treatment. The PK fertilization in nitrogen-rich sites resulted in the largest volume growth response and longest temporal effect (1.0–2.0 m 3 ·ha –1 ·a –1 higher mean growth for at least 35 years), with quicker and stronger effects in more southern conditions where average temperature sums were greater than 1000 degree-days (°C). NPK fertilization in nitrogen-poor sites gave a modest response (0.4–0.8 m 3 ·ha –1 ·a –1 in 35 years).
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Claims 3
Claim · model-written summary
PK fertilization on nitrogen-rich sites produced the largest and longest Scots pine volume growth response, 1.0–2.0 m3 per hectare per year higher for at least 35 years.
- Taxon
- Scots pine
Pinus sylvestrist0 - Treatment
- PK fertilizatione0
- Outcome
- volume growth responsee0
- Direction
- highere0
- Value
- 1.0–2.0 m 3 ·ha –1 ·a –1e0
- Qualifier
- nitrogen-rich sitese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PK fertilization in nitrogen-rich sites resulted in the largest volume growth response and longest temporal effect (1.0–2.0 m 3 ·ha –1 ·a –1 higher mean growth for at least 35 years)”
t0“Scots pine”
Claim · model-written summary
The PK response was quicker and stronger in southern conditions with temperature sums above 1000 degree-days.
- Taxon
- Scots pinePinus sylvestrist0
- Outcome
- effectse0
- Direction
- quicker and strongere0
- Qualifier
- average temperature sums were greater than 1000 degree-days (°C)e0
- Setting
- more southern conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with quicker and stronger effects in more southern conditions where average temperature sums were greater than 1000 degree-days (°C)”
t0“Scots pine”
Claim · model-written summary
NPK fertilization on nitrogen-poor sites gave a modest Scots pine volume growth response of 0.4–0.8 m3 per hectare per year over 35 years.
- Taxon
- Scots pinePinus sylvestrist0
- Treatment
- NPK fertilizatione0
- Outcome
- responsee0
- Direction
- modeste0
- Value
- 0.4–0.8 m 3 ·ha –1 ·a –1e0
- Qualifier
- nitrogen-poor sitese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPK fertilization in nitrogen-poor sites gave a modest response (0.4–0.8 m 3 ·ha –1 ·a –1 in 35 years)”
t0“Scots pine”
The same questions in other papers
fertilization · growth · Pinus sylvestris (Scots pine)Positive and negative results
23 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- positive
- positive
29 papers more in this group
See all 33 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.