Biogeosciences
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Articles | Volume 22, issue 20
Articles | Volume 22, issue 20
https://doi.org/10.5194/bg-22-5833-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-5833-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 20
Research article
 | 
22 Oct 2025
Research article |  | 22 Oct 2025

The use of newly assimilated photosynthates by soil autotrophic and heterotrophic respiration on a diurnal scale

Moeka Ono, Bhaskar Mitra, Benju Baniya, Dohee Kim, and Asko Noormets

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Short summary
Cospectral analysis was used to quantify coupling of autotrophic and heterotrophic soil respiration (Ra and Rh) to plant carbohydrate status in a subtropical pine forest in the southern US. Rh showed stronger diurnal links with gross primary productivity (GPP) than Ra, and lagged GPP by 2–4 h, suggesting rapid transfer of carbohydrates to the soil. Soil temperature and moisture had strong cospectral peaks at synoptic scales, but were not causal drivers at the diurnal scale.
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