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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

<a href="/en/project/LTT19018" target="_blank" >LTT19018: Participation of the Czech Republic in the GEM network</a><br>

Continuities

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

Publication year

2022

Confidentiality

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

Name of the periodical

Journal of Ecology

ISSN

0022-0477

e-ISSN

1365-2745

Volume of the periodical

110

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

17

Pages from-to

387-403

UT code for WoS article

000726340400001

EID of the result in the Scopus database

2-s2.0-85120478738