Effects of CO[sub 2] on apparent dark respiration in loblolly and ponderosa pine seedlings grown in sub-optimal, optimal or supra-optimal nitrogen

Conference · Wed Jun 01 00:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7016050

Griffin, K L; Strain, B R ^[1]; Winner, W E ^[2]

---

1. Duke Univ., Durham, NC (United States)
2. Oregon State Univ., Corvallis, OR (United States)

Differences in the response of apparent dark respiration to elevated CO[sub 2] and nitrogen were studied in loblolly (Pinus taeda) and ponderosa (P. ponderosa) pine seedlings. Seedlings of both species were grown for 160 days in two CO[sub 2] partial pressures (35 or 70 Pa) and three levels of soil nitrogen (1, 3.5 or 7 mM NH[sub 4]) in sterilized sand culture. Ponderosa pine had higher apparent respiration rates (CO[sub 2] efflux in the dark) than loblolly pine across all CO[sub 2] and nitrogen treatments. Loblolly poine grown in elevated CO[sub 2] had lower apparent respiration rates than seedlings grown in low CO[sub 2]. Apparent respiration for ponderosa pine was similar at both CO[sub 2] partial pressures. Apparent respiration increased with nitrogen in both species. The direct effects of ambient CO[sub 2] environment surrounding isolated leaves or whole seedlings. Short term increases in CO[sub 2] partial pressures consistently resulted in significant decreases in CO[sub 2] efflux across the growth treatments and measurement scales. Leaf level decreases in CO[sub 2] efflux were as large as 90% when CO[sub 2] partial pressures were increased form 0 to 100 Pa Species level differences in apparent respiration, and its response to nitrogen availability, may influence the potential of these two species to grow and sequester carbon as atmospheric CO[sub 2] increases.

• OSTI ID: 7016050
• Report Number(s): CONF-940894--
• Journal Information: Bulletin of the Ecological Society of America; (United States), Journal Name: Bulletin of the Ecological Society of America; (United States) Vol. 75:2; ISSN BECLAG; ISSN 0012-9623
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATABOLISM
CHALCOGENIDES
CHEMISTRY
CONIFERS
ECOLOGICAL CONCENTRATION
ELEMENTS
METABOLISM
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PINES
PINOPHYTA
PLANTS
SOIL CHEMISTRY
TREES