Interactive effects of carbon dioxide and nutrient availability on nutrient uptake, allocation and accretion in loblolly pine seedlings (Pinus taeda L. )

Conference · Tue Jun 01 00:00:00 EDT 1993 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:6396514

Thomas, R B; Strain, B R ^[1]

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1. Duke Univ., Durham, NC (United States)

Nitrogen and phosphorus content and uptake rates were determined in loblolly pine grown at two CO[sub 2] levels (35 and 65 Pa) and three nutrient levels (7 mM NM[sub 4]NO[sub 3] + 1 mM PO[sub 4]; 7 mM NH[sub 4]NO[sub 3]+ 0.2 mM PO[sub 4]; 1 mM NH[sub 4]NO[sub 3] + 1 mM PO[sub 4]) over one growing season. Neither N uptake nor P uptake rates (on a root weight basis) were affected by CO[sub 2] enrichment in any of the nutrient treatments. Nutrient limitations by either N or P reduced the uptake rates of both N and P by seedlings. As the growing season progressed, leaf N and P concentrations decreased, and with nonlimiting soil N, leaf N was diluted by elevated CO[sub 2]. Leaf P was unaffected by CO[sub 2] enrichment as were concentrations of both N and P in stems and roots. Under nonlimiting N, almost 70% of total plant N was allocated to needles. Greater N was allocated to roots at the expense of leaf N under conditions of low soil N and this was enhanced by CO[sub 2] enrichment. With limiting P, there was almost no change in allocation of N or P, and only a marginal effect of CO[sub 2] enrichment on P allocation. Stimulation of biomass production by elevated CO[sub 2] with no increase in nutrient uptake rates indicates an increase in nutrient use efficiency by the seedlings.

• OSTI ID: 6396514
• Report Number(s): CONF-930798-; CODEN: BECLAG
• Journal Information: Bulletin of the Ecological Society of America; (United States), Vol. 74:2; Conference: 78. annual Ecological Society of America (ESA) meeting, Madison, WI (United States), 31 Jul - 4 Aug 1993; ISSN 0012-9623
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CARBON DIOXIDE
BIOLOGICAL EFFECTS
NUTRIENTS
AVAILABILITY
PINES
UPTAKE
NITROGEN
PHOSPHORUS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CONIFERS
ELEMENTS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PINOPHYTA
PLANTS
TREES
560300* - Chemicals Metabolism & Toxicology