Modelling the Rhizosphere Priming Effect in Combination with Soil Food Webs to Quantify Interaction between Living Plant, Soil Biota and Soil Organic Matter

2022 | journal article. A publication with affiliation to the University of Göttingen.

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​Modelling the Rhizosphere Priming Effect in Combination with Soil Food Webs to Quantify Interaction between Living Plant, Soil Biota and Soil Organic Matter​
Chertov, O.; Kuzyakov, Y. ; Priputina, I.; Frolov, P.; Shanin, V. & Grabarnik, P.​ (2022) 
Plants11(19) pp. 2605​.​ DOI: https://doi.org/10.3390/plants11192605 

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Authors
Chertov, Oleg; Kuzyakov, Yakov ; Priputina, Irina; Frolov, Pavel; Shanin, Vladimir; Grabarnik, Pavel
Abstract
A model of rhizosphere priming effect under impact of root exudate input into rhizosphere soil was developed as an important process of the plant-soil interaction. The model was based on the concept of nitrogen (N) mining, compensating for the N scarcity in exudates for microbial growth by accelerating SOM mineralisation. In the model, N deficiency for microbial growth is covered (“mined”) by the increased SOM mineralisation depending on the C:N ratio of the soil and exudates. The new aspect in the model is a food web procedure, which calculates soil fauna feeding on microorganisms, the return of faunal by-products to SOM and mineral N production for root uptake. The model verification demonstrated similar magnitude of the priming effect in simulations as in the published experimental data. Model testing revealed high sensitivity of the simulation results to N content in exudates. Simulated CO2 emission from the priming can reach 10–40% of CO2 emission from the whole Ah horizon of boreal forest soil depending on root exudation rates. This modeling approach with including food web activity allows quantifying wider aspects of the priming effect functioning including ecologically important available N production.
Issue Date
2022
Journal
Plants 
Organization
Abteilung Ökopedologie der gemäßigten Zonen 
eISSN
2223-7747
Language
English
Sponsor
Basic Scientific Research theme of Pushchino Scientific Center for Biological Research

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