Large contribution of recent photosynthate to soil respiration in tropical dipterocarp forest revealed by girdling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F22%3A43920450" target="_blank" >RIV/62156489:43410/22:43920450 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1111/1365-2745.13806" target="_blank" >https://doi.org/10.1111/1365-2745.13806</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/1365-2745.13806" target="_blank" >10.1111/1365-2745.13806</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Large contribution of recent photosynthate to soil respiration in tropical dipterocarp forest revealed by girdling

Popis výsledku v původním jazyce

Tropical forests are the most productive terrestrial ecosystems, fixing over 40 Pg of carbon from the atmosphere each year. A substantial portion of this carbon is allocated belowground to roots and root-associated microorganisms. However, there have been very few empirical studies on the dynamics of this below-ground transfer, especially in tropical forests where carbon allocation processes are mediated by high plant species diversity. We used a whole-stand girdling experiment to halt the belowground transfer of recent photosynthates in a lowland tropical forest in Borneo. By girdling 209 large trees in a 0.48 ha plot, we determined: i) the contribution of recent photosynthate to root-rhizosphere respiration and; ii) the relationships among the disruption of this belowground carbon supply, tree species composition and mortality. Mortality of the 209 trees was 62% after 370 days, with large variation among species and particularly high mortality within the Dipterocarpaceae (99%) and Fagacae (100%) families. We also observed a higher risk of mortality following girdling for species with lower wood density. Soil CO2 emissions declined markedly (36 +- 5%) over ~50 days following girdling in three of six monitored subplots. In the other three subplots there was either a marginal decline or no response of soil CO2 emissions to girdling. The decrease in soil CO2 efflux was higher in subplots with dominance of Dipterocarpaceae. Synthesis. Our results indicate high spatial variation in the coupling of belowground carbon allocation and root-rhizosphere respiration in this tropical forest, with a closer coupling in forest dominated by Dipterocarpaceae. Our findings highlight the implications of tree species composition of tropical forests in affecting the dynamics of belowground carbon transfer and its release to the atmosphere.

Název v anglickém jazyce

Large contribution of recent photosynthate to soil respiration in tropical dipterocarp forest revealed by girdling

Popis výsledku anglicky

Tropical forests are the most productive terrestrial ecosystems, fixing over 40 Pg of carbon from the atmosphere each year. A substantial portion of this carbon is allocated belowground to roots and root-associated microorganisms. However, there have been very few empirical studies on the dynamics of this below-ground transfer, especially in tropical forests where carbon allocation processes are mediated by high plant species diversity. We used a whole-stand girdling experiment to halt the belowground transfer of recent photosynthates in a lowland tropical forest in Borneo. By girdling 209 large trees in a 0.48 ha plot, we determined: i) the contribution of recent photosynthate to root-rhizosphere respiration and; ii) the relationships among the disruption of this belowground carbon supply, tree species composition and mortality. Mortality of the 209 trees was 62% after 370 days, with large variation among species and particularly high mortality within the Dipterocarpaceae (99%) and Fagacae (100%) families. We also observed a higher risk of mortality following girdling for species with lower wood density. Soil CO2 emissions declined markedly (36 +- 5%) over ~50 days following girdling in three of six monitored subplots. In the other three subplots there was either a marginal decline or no response of soil CO2 emissions to girdling. The decrease in soil CO2 efflux was higher in subplots with dominance of Dipterocarpaceae. Synthesis. Our results indicate high spatial variation in the coupling of belowground carbon allocation and root-rhizosphere respiration in this tropical forest, with a closer coupling in forest dominated by Dipterocarpaceae. Our findings highlight the implications of tree species composition of tropical forests in affecting the dynamics of belowground carbon transfer and its release to the atmosphere.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10618 - Ecology

Projekt

<a href="/cs/project/LTT19018" target="_blank" >LTT19018: Participace ČR v globální síti GEM</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Ecology

ISSN

0022-0477

e-ISSN

1365-2745

Svazek periodika

110

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

387-403

Kód UT WoS článku

000726340400001

EID výsledku v databázi Scopus

2-s2.0-85120478738