Effects of enhanced soil P on photosynthesis, root respiration and nutrient uptake of Artemisia tridentata in different photosynthetic photon flux densities and CO[sub 2] conditions

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

OSTI ID:7016036

Cui, M; Caldwell, M M ^[1]

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1. Utah State Univ., Logan, UT (United States)

Responses of leaf photosynthesis, root respiration and P uptake by Artemisia tridentata seedlings to study root physiological adjustments to utilize available nutrient resources in a changing soil environment. Root respiration was measured for intact root systems in split-root chambers. Increasing P in 0.2 [times] Hoagland's solution from 0.04 mmol to 2.0 mmol increased leaf photosynthesis by 6% in 3 days, increased nighttime leaf respiration rate by 8% and root respiration by 18%. After PPFD was reduced from 800 to 200 [mu]mol m[sup [minus]2]s[sup [minus]1] leaf photosynthesis deceased by 67%, and root respiration by 26% in the following day but then decreased by 35% over the next three days. Shading may limit root growth and nutrient uptake by lowering the carbohydrate supply to root systems.

• OSTI ID: 7016036
• Report Number(s): CONF-940894-; CODEN: BECLAG
• Journal Information: Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; 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
ECOLOGICAL CONCENTRATION
PHOSPHORUS
BIOLOGICAL EFFECTS
SHRUBS
PLANT GROWTH
SOILS
SOIL CHEMISTRY
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
ELEMENTS
GROWTH
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLANTS
560300* - Chemicals Metabolism & Toxicology