Dynamic of Fluorescence Emissions at O(2)A and O2B Telluric Absorption Bands in Forested Areas with Seasonal APAR and GPP Variations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F23%3A00567213" target="_blank" >RIV/86652079:_____/23:00567213 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2072-4292/15/1/67" target="_blank" >https://www.mdpi.com/2072-4292/15/1/67</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/rs15010067" target="_blank" >10.3390/rs15010067</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamic of Fluorescence Emissions at O(2)A and O2B Telluric Absorption Bands in Forested Areas with Seasonal APAR and GPP Variations

Popis výsledku v původním jazyce

We measured dynamics of solar-induced chlorophyll fluorescence at telluric oxygen absorption bands O(2)A and O2B in evergreen spruce and deciduous beech forests. Seasonal variations in fluorescence emissions were compared with NDVI. Daily changes in fluorescence emissions were compared with canopy shadow fraction (alpha(S)) dynamics, which showed impact of branch and leaf positions on detected fluorescence signals based on comparison with canopy height model. Absorbed photosynthetically active radiation (APAR) was recognized as a large determinant of fluorescence changes within the O(2)A band (SIFA), with R-2 > 0.68. Fluorescence within the O2B band was more directly linked to NDVI. Although, the seasonal dynamics of fluorescence within the O2B band (SIFB) were similar to SIFA in the spruce forest. In the beech forest, SIFB showed different seasonal dynamics as compared with SIFA. SIFA in the spruce forest showed a relationship to gross primary productivity (GPP), with R-2 = 0.48, and a relationship of R-2 = 0.37 was estimated for the SIFA-GPP connection in the beech forest. SIFB was better linked to seasonal GPP in the beech forest, but with a negative slope in the relationship with R-2 = 0.61. We have shown that measurements of passive fluorescence signals at telluric oxygen absorption bands can contribute to understanding to photosynthesis processes in forest canopies.

Název v anglickém jazyce

Dynamic of Fluorescence Emissions at O(2)A and O2B Telluric Absorption Bands in Forested Areas with Seasonal APAR and GPP Variations

Popis výsledku anglicky

We measured dynamics of solar-induced chlorophyll fluorescence at telluric oxygen absorption bands O(2)A and O2B in evergreen spruce and deciduous beech forests. Seasonal variations in fluorescence emissions were compared with NDVI. Daily changes in fluorescence emissions were compared with canopy shadow fraction (alpha(S)) dynamics, which showed impact of branch and leaf positions on detected fluorescence signals based on comparison with canopy height model. Absorbed photosynthetically active radiation (APAR) was recognized as a large determinant of fluorescence changes within the O(2)A band (SIFA), with R-2 > 0.68. Fluorescence within the O2B band was more directly linked to NDVI. Although, the seasonal dynamics of fluorescence within the O2B band (SIFB) were similar to SIFA in the spruce forest. In the beech forest, SIFB showed different seasonal dynamics as compared with SIFA. SIFA in the spruce forest showed a relationship to gross primary productivity (GPP), with R-2 = 0.48, and a relationship of R-2 = 0.37 was estimated for the SIFA-GPP connection in the beech forest. SIFB was better linked to seasonal GPP in the beech forest, but with a negative slope in the relationship with R-2 = 0.61. We have shown that measurements of passive fluorescence signals at telluric oxygen absorption bands can contribute to understanding to photosynthesis processes in forest canopies.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10610 - Biophysics

Projekt

<a href="/cs/project/EF16_019%2F0000797" target="_blank" >EF16_019/0000797: SustES - Adaptační strategie pro udržitelnost ekosystémových služeb a potravinové bezpečnosti v nepříznivých přírodních podmínkách</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Remote Sensing

ISSN

2072-4292

e-ISSN

2072-4292

Svazek periodika

15

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

19

Strana od-do

67

Kód UT WoS článku

000909575800001

EID výsledku v databázi Scopus

2-s2.0-85145975383