Growth, survival, competition, and canopy carbon dioxide and water vapor exchange of first year alfalfa at an elevated CO2 concentration

Title:

Growth, survival, competition, and canopy carbon dioxide and water vapor exchange of first year alfalfa at an elevated CO2 concentration

Creator:

Bunce, J.A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:66245f0b-5bc4-408c-bfec-136855311de0
uuid:66245f0b-5bc4-408c-bfec-136855311de0
urnnbn:urn:nbn:cz:aba007-000fis

Type:

model:internalpart and TEXT

Format:

print

Description:

Alfalfa was grown in fíeld plots at the current CO2 concentratíon (350 pmol mol"' = C350) and at 350 pmol mol"' above the current concentratíon (= c^qq). Alfalfa and weed growth, and canopy water vapor (£) and carbon dioxide exchange (f) were determined for the first year. Alfalfa yield summed for the three harvests in the first year was greater for the C700 treatment in two of the years studied, but significantly less in a third year. Weed growth was unaffected. Survival of alfalfa plants was greater at Cypo for years in which there was substantíal mortality, even when yield was not increased by the C700 treatment. In špite of a persistent reduction in leaf conductance to water vapor (gj), total canopy conductance (g^) to water vapor did not differ between CO2 treatments when averaged over years, because of compensating changes in canopy leaf area. CO2 efílux (F) at night per unit of ground area was consistently less in the cjqq treatment, even when daytime CO2 uptake was higher. Hence the periodic harvesting of alfalfa crops does not necessarily allow elevated CO2 to cause persistent growth stimulatíon nor reduced water use.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

557-565 and 79-87

Source:

Photosynthetica | 1993 Volume:29 | Number:4

Harvested from:

CDK

Metadata only:

false