Nedbrytning av ectomycorrhiza-sopp endrer jord-karbonlagring i en simuleringsmodell

| Type artikkel: Publisert studie
Det er vår hypotese at ectomycorrhiza-sopp også kan være aktive nedbrytere når karbon-tildelingen til sopp er lav.

Forfattere:

J. A. M. Moore, J. Jiang, W. M. Post, and A. T. Classen 2015.

Publiseringssted:

Ecosphere 6:art29. http://dx.doi.org/10.1890/ES14-00301.1

Årstall:

2015

Bakgrunn

Carbon cycle models often lack explicit belowground organism activity, yet belowground organisms regulate carbon storage and release in soil. Ectomycorrhizal fungi are important players in the carbon cycle because they are a conduit into soil for carbon assimilated by the plant.

 

Mål

It is hypothesized that ectomycorrhizal fungi can also be active decomposers when plant carbon allocation to fungi is low.

 

Fremgangsmåte

Here, we reviewed the literature on ectomycorrhizal decomposition and we developed a simulation model of the plant-mycorrhizae interaction where a reduction in plant productivity stimulates ectomycorrhizal fungi to decompose soil organic matter.

Our review highlights evidence demonstrating the potential for ectomycorrhizal fungi to decompose soil organic matter.

 

Funn

Our model output suggests that ectomycorrhizal activity accounts for a portion of carbon decomposed in soil, but this portion varied with plant productivity and the mycorrhizal carbon uptake strategy simulated. Lower organic matter inputs to soil were largely responsible for reduced soil carbon storage. Using mathematical theory, we demonstrated that biotic interactions affect predictions of ecosystem functions. Specifically, we developed a simple function to model the mycorrhizal switch in function from plant symbiont to decomposer.

 

Konklusjon

We show that including mycorrhizal fungi with the flexibility of mutualistic and saprotrophic lifestyles alters predictions of ecosystem function.

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