Claim · model-written summary
Foliar nitrogen concentration decreased as needle age increased.
- Taxon
- Picea Chihuahuana
Picea chihuahuanat0 - Outcome
- foliar nutrient concentration of Ne0
- Direction
- decreasede0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliar nutrient concentration of N, P, and K decreased with increasing needle age”
t0“Picea Chihuahuana”
Title
Ecology of Picea Chihuahuana Martinez
Alan G. Gordon Ecology 1968. doi:10.2307/1936540
Other claims from this paper (13)
- Observation Picea chihuahuana probably arrived in North America during the Cretaceous or earlier.
- Observation Its forests are cool montane temperate.
- Observation The tree occurred only on fresh and moist sites at the examined station.
- Observation Height and diameter growth was greater on moist than fresh sites.
- Observation Diameter growth culminated at 85 years.
- Observation Mean specific gravity was .347.
- Observation Specific gravity did not differ significantly by site.
- Observation Moist-site soils had lower pH, calcium and potassium than fresh-site soils.
- Observation Foliar phosphorus and potassium concentrations decreased with needle age, then increased in the oldest needles.
- Observation Foliar calcium increased with needle age, then decreased in oldest needles.
- Observation Picea chihuahuana tolerates high calcium concentration.
- Observation Associated plant assemblages differed significantly between fresh and moist sites.
- Observation The present range and regeneration pattern suggest extinction risk.