Vegetative stage and soil horizon respectively determine direction and magnitude of rhizosphere priming effects in contrasting tree line soils

Michel, Jennifer; Fontaine, Sébastien; Revaillot, Sandrine; Picon-Cochard, Catherine; Whitaker, Jeanette

doi:10.1111/1365-2435.14625

Article (Scientific journals)

Vegetative stage and soil horizon respectively determine direction and magnitude of rhizosphere priming effects in contrasting tree line soils

Michel, Jennifer; Fontaine, Sébastien; Revaillot, Sandrine et al.

2024 • In Functional Ecology

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https://hdl.handle.net/2268/321758

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10.1111/1365-2435.14625

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Keywords :

Andean mountains; carbon cycle; climate change; microbial mineralisation; plant-soil feedback; rhizosphere priming effect; soil organic matter; sub arctic; treeline

Abstract :

[en] 1. Tree lines in high latitudes and high altitudes are considered sentinels of global change. This manifests in accelerated encroachment of trees and shrubs and en- hanced plant productivity, with currently unknown implications for the carbon balance of these biomes. Given the large soil organic carbon stocks in many tree line soils, we here wondered whether introducing highly productive plants would accelerate carbon cycling through rhizosphere priming effects and if certain soils would be more vulnerable to carbon loss from positive priming than others. 2. To test this, organic and mineral soils were sampled above and below tree lines in the Swedish sub-arctic and the Peruvian Andes. A greenhouse experiment was then performed to quantify plant-induced changes in soil mineralisation rates (rhizosphere priming effect) and new C formation using natural abundance label- ling and the C4-species Cynodon dactylon. Several environmental, plant, soil and microbial parameter were monitored during the experiment to complement the observations on soil C cycling. 3. Priming was predominantly positive at the beginning of the experiment, then sys- tematically decreased in all soils during the plant growth season to be mostly negative at the end of the experiment at plant senescence. Independent of direc - tion of priming, the magnitude of priming was always greater in organic than in corresponding mineral soils, which was best explained by the higher C contents of these soils. Integrated over the entire study period, the overall impact of priming (positive and negative) on the soil C balance was mostly negligible. Though net soil C loss was observed in organic soils from the sub-arctic tundra in Sweden. 4. Most notably, positive and negative priming effects were not mutually exclu- sive, rather omnipresent across ecosystems, depending on sampling time. The direction of priming seems to be fluctuating with plant productivity, rhizosphere carbon inputs and nutrient uptake. This highlights the need for integrative long- term studies if we aim to understand priming effects at ecosystem scale and greenhouse and laboratory studies must be validated in situ to enable reliable ecological upscaling.

Disciplines :

Environmental sciences & ecology
Earth sciences & physical geography

Author, co-author :

Michel, Jennifer ; Université de Liège - ULiège > Département GxABT > Plant Sciences

Fontaine, Sébastien

Revaillot, Sandrine

Picon-Cochard, Catherine

Whitaker, Jeanette

Language :

English

Title :

Vegetative stage and soil horizon respectively determine direction and magnitude of rhizosphere priming effects in contrasting tree line soils

Publication date :

06 August 2024

Journal title :

Functional Ecology

ISSN :

0269-8463

eISSN :

1365-2435

Publisher :

Wiley, Oxford, United Kingdom

Peer reviewed :

Peer Reviewed verified by ORBi

Development Goals :

13. Climate action
15. Life on land

Available on ORBi :

since 06 September 2024

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