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