A test of gas exchange measurements on excised canopy branches of ten tropical tree species

Title:

A test of gas exchange measurements on excised canopy branches of ten tropical tree species

Creator:

Santiago, L. S. and Mulkey, S. S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:312c8b18-062a-4990-b6e3-76d138c08d06
uuid:312c8b18-062a-4990-b6e3-76d138c08d06
issn:0300-3604
doi:10.1023/B:PHOT.0000015457.92479.eb

Subject:

canopy physiology, C02 response curve, Panama, potometer, species differences in photosynthetic characteristics, specific leaf area, stomatal conductance, and tropical forest

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We studied gas exchange of leaves on branches that had been cut and then re-cut under water to assess the utility of measuring gas exchange on leaves of excised canopy branches. There was large variation between species in their ability to photosynthesize following excision. Some species maintained up to 86.5% of intact photosynthetic rate 60 min after excision, whereas other species dropped below 40% of intact photosynthetic rates within 3 min. Three species showed significant reductions in maximum rates of gross photosynthetic rate (PG) on leaves of excised branches relative to intact branches. Excision significantly reduced carboxylation rates (Vcmax) in four species and electron transport (Jmax) in two species. There were also significant increases in compensation irradiance and reductions of day rates of respiration relative to intact measurements. While gas exchange on excised branches can provide useful measures for canopy species, responses of individual species to branch excision need to be taken into account. Measurements on pre-screened species allow a greater understanding of canopy photosynthesis of large trees when canopy access is not an option. and L. S. Santiago, S. S. Mulkey.

Language:

Multiple languages

Rights:

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

Coverage:

343-347

Source:

Photosynthetica | 2003 Volume:41 | Number:3

Harvested from:

CDK

Metadata only:

false