Claim · model-written summary
Foliar calcium increased with needle age, then decreased in oldest needles.
- Taxon
- Picea Chihuahuana
Picea chihuahuanat0 - Outcome
- Cae0
- Direction
- increasede0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca increased with advancing needle age but decreased in the oldest needles”
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 nitrogen concentration decreased as needle age increased.
- Observation Foliar phosphorus and potassium concentrations decreased with needle age, then increased in the 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.