Mechanisms of phosphorus acquisition for ponderosa pine seedlings under high CO2 and temperature

E. H. Delucia, R. M. Callaway, E. M. Thomas, W. H. Schlesinger

Research output: Contribution to journalArticle

Abstract

To test the hypothesis that elevated atmospheric CO2 and elevated temperature, simulating current and predicted future growing season conditions, act antagonistically on phosphorus acquisition of ponderosa pine, seedlings were grown in controlled-environment chambers in a two temperature (25/10°C and 30/15 °C) x two CO2 (350 and 700 μl-1) experimental design Mycorrhizal seedlings were watered daily with a nutrient solution with P added in organic form as inositol hexaphosphate (64 ppm P). Thus seedlings were challenged to use active forms of P acquisition. Elevated CO2 increased the relative growth rate by approx. 5% which resulted in an approx. 33% increase in biomass after 4 months. There was no main effect of temperature on growth. Increased growth under elevated CO2 and temperature was supported by increases in specific absorption rate and the specific utilization rate of P. The contribution of mycorrhizae to P uptake may have been greater under simulated future conditions, as elevated CO2 increased the number of mycorrhizal roots. There was no main effect of temperature on root phosphatase activity, but elevated CO2 caused a decrease in activity. The inverse pattern of root phosphatase activity and mycorrhizal infection across treatments suggests a physiological coordination between these avenues of P acquisition. The concentration of oxalate in the soil increased under elevated CO2 and decreased under elevated temperature. This small molecular weight acid solubilizes inorganic P making it available for uptake. Increased mycorrhizal infection and exudation of oxalate increased P uptake in ponderosa pine seedlings under elevated CO2, and there was no net negative effect of increased temperature. The increased carbon status of pine under elevated CO2 may facilitate uptake of limiting P in native ecosystems.

Original languageEnglish (US)
Pages (from-to)111-120
Number of pages10
JournalAnnals of botany
Volume79
Issue number2
DOIs
StatePublished - Feb 1997

Fingerprint

Pinus ponderosa
phosphorus
seedlings
temperature
uptake mechanisms
oxalates
inorganic acids
exudation
mycorrhizae
infection
nutrient solutions
Pinus
experimental design
growing season
molecular weight
ecosystems
carbon
biomass
soil

Keywords

  • Atmospheric CO
  • Pinus ponderosa
  • climate change
  • growth analysis
  • oxalate
  • phosphorus uptake
  • ponderosa pine
  • rhizosphere
  • root phosphatase
  • temperature

ASJC Scopus subject areas

  • Plant Science

Cite this

Mechanisms of phosphorus acquisition for ponderosa pine seedlings under high CO2 and temperature. / Delucia, E. H.; Callaway, R. M.; Thomas, E. M.; Schlesinger, W. H.

In: Annals of botany, Vol. 79, No. 2, 02.1997, p. 111-120.

Research output: Contribution to journalArticle

Delucia, E. H. ; Callaway, R. M. ; Thomas, E. M. ; Schlesinger, W. H. / Mechanisms of phosphorus acquisition for ponderosa pine seedlings under high CO2 and temperature. In: Annals of botany. 1997 ; Vol. 79, No. 2. pp. 111-120.
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