Analysis of photosynthetic activity at the leaf and canopy levels from reflectance measurements: a case study

Title:

Analysis of photosynthetic activity at the leaf and canopy levels from reflectance measurements: a case study

Creator:

Méthy, M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:5f3be449-a3fb-4362-b06d-ba26bca19378
uuid:5f3be449-a3fb-4362-b06d-ba26bca19378
issn:0300-3604
doi:10.1023/A:1012449104831

Subject:

fluorescence, imaging, photochemical reflectance index, photosynthetic activity, and Quercus ilex

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The photochemical reflectance index (PRI), based on reflectance signatures at 531 and 570 nm, and associated with xanthophyll pigment inter-conversion and related thylakoid energisation, was evaluated as an indicator of photosynthetic function in a Mediterranean holm oak (Quercus ilex L.) coppice. The chlorophyll fluorescence pulse-amplitude-modulation and the eddy correlation techniques were used to estimate the photosystem 2 photochemical efficiency of leaves and the CO2 flux over the canopy, respectively. The reflectance and fluorescence techniques yielded identical estimates of the photosynthetic activity in leaves exposed to dark-light-dark cycles or to a variable irradiance in laboratory. However, there was no such correlation between photosynthetic performance and PRI when applied to a sun-exposed canopy in field conditions. Fluorescence profiles inside the canopy and especially a helpful use of multispectral reflectance imaging highlight the limitations of such method.

Language:

Multiple languages

Rights:

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

Coverage:

505-512

Source:

Photosynthetica | 2000 Volume:38 | Number:4

Harvested from:

CDK

Metadata only:

false