co2 · Growth · Picea sitchensis (Sitka spruce)

Results differ8 papers: 4 positive, 4 negative or no effect · 1 pair of papers confirmed to differ

17 claims from these papers; 1 citation between them.

Papers whose results differ, checked claim by claim 1

1 pair of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.

Testing a process-based model of tree seedling growth by manipulating [CO2] and nutrient uptake (2000)
no changeSitka spruce growth did not respond to elevated carbon dioxide.
Effects of elevated CO₂, water and nutrients onPicea sitchensis(Bong.) Carr seedlings (1995)
increaseElevated CO2 significantly increased growth except in well-watered unfertilized seedlings.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →

How these papers cite each other

1 citation between these papers: 1 on the same side, 0 across the two sides.

Positive result
Negative result or no effect
Citation, pointing to the cited paper
Citation across the two sides
Larger circle: more citations overall

Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.

Papers reporting a positive result 4

Some Effects of CO₂, Daylength and Nutrition on the Growth of Young Forest Tree Plants I. In the Seedling Stage · 1981
- positive
  Higher CO2 significantly increased Sitka spruce growth.
Effects of elevated carbon dioxide and drought on the growth and physiology of clonal Sitka spruce plants (Picea sitchensis (Bong.) Carr.) · 1993
- positive
  Elevated CO2 increased mean relative growth rate by 9.8% under well-watered conditions.
  compared with controls
- positive
  Elevated CO2 increased mean relative growth rate by 6.9% under drought.
  compared with controls
- no effect
  Elevated CO2 did not affect biomass partitioning to roots.
cited by 1 paper here
The Influence of Carbon Dioxide or Ozone Concentration on Growth and Assimilate Partitioning in Seedlings of Nine Conifers · 1994
- positive
  Picea sitchensis total plant dry weight enhanced.
- positive
  Picea sitchensis mean relative growth rate (RGR) enhanced.
Effects of elevated CO₂, water and nutrients onPicea sitchensis(Bong.) Carr seedlings · 1995
- positive
  Elevated CO2 increased well-watered fertilized biomass by 52%.
  compared with ambient treatment
- positive
  Elevated CO2 significantly increased growth except in well-watered unfertilized seedlings.
- positive
  Elevated CO2 increased early-season relative growth rates.
- positive
  Elevated CO2 increased well-watered unfertilized biomass by 19%.
  compared with ambient treatment
- positive
  Elevated CO2 increased droughted unfertilized biomass by 49%.
  compared with ambient treatment
- positive
  Elevated CO2 increased droughted fertilized biomass by 44%.
  compared with ambient treatment
cites 1 paper here

Papers reporting a negative result or no effect 4

Effects of elevated CO2, nutrition and climatic warming on bud phenology in Sitka spruce (Picea sitchensis) and their impact on the risk of frost damage · 1994
- no effect
  Elevated carbon dioxide had no effect on Skidegate a bud dormancy.
  compared with ambient
- no effect
  Elevated carbon dioxide did not affect bud dormancy at high nutrient supply.
  compared with ambient
Growth response of branches of Picea sitchensis to four years exposure to elevated atmospheric carbon dioxide concentration · 1999
- no effect
  Elevated carbon dioxide did not stimulate growth or meristematic activity.
  compared with ambient [CO 2 ]
Long-term effects of elevated carbon dioxide concentration and provenance on four clones of Sitka spruce (Picea sitchensis). I. Plant growth, allocation and ontogeny · 1999
- negative
  In the third year, elevated CO2 significantly shortened shoot extension growth duration in three of four clones, through suppression of lammas growth.
  compared with ambient (~350 micromol per mol)
Testing a process-based model of tree seedling growth by manipulating [CO2] and nutrient uptake · 2000
- no effect
  Sitka spruce growth did not respond to elevated carbon dioxide.

A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.

co2 on Picea sitchensis (Sitka spruce) against other targets

Physiology: photosynthesisResults agree

Papers whose results differ, checked claim by claim 1

How these papers cite each other

Papers reporting a positive result 4

Papers reporting a negative result or no effect 4

co2 on Picea sitchensis (Sitka spruce) against other targets

co2 · growth on other organisms