Elevated CO[sub 2] and altered source/sink relationships: Carbon allocation and nitrogen resorption in two annual grasses

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

OSTI ID:7016064

Geeske, J; Field, C B; Jackson, R B ^[1]

---

1. Stanford Univ., CA (United States)

Predicting plant response to elevated CO[sub 2] requires a better understanding of carbon and nitrogen interactions within plants. We altered C sources and sinks by increasing available CO[sub 2] and clipping tillers of two common annual species. (Avena fatua and Bromus mollis) and examined treatment effects on biomass, allocation, leaf and root properties, nitrogen pools and N retranslocation. Within 12 days of germination, total Avena biomass in elevated CO[sub 2] increased by 25%, but the increased biomass was exclusively in roots. After 7 weeks there was still no change in Avena shoot biomass in elevated CO[sub 2] and the number of tillers produced also was unchanged. Leaf mass per unit area increased 11 and 29% for Avena and Bromus grown in higher CO[sub 2]. Removing tillers increased the area of individual Avena leaves by 60% and resulted in significantly thinner roots, independent of CO[sub 2] treatment. We summarize biomass, allocation, and N resorption for each species from germination through flowering.

• OSTI ID: 7016064
• 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
CHALCOGENIDES
ECOLOGICAL CONCENTRATION
GRAMINEAE
GROWTH
LILIOPSIDA
MAGNOLIOPHYTA
OXIDES
OXYGEN COMPOUNDS
PLANT GROWTH
PLANTS