Modelling the Rhizosphere Priming Effect in Combination with Soil Food Webs to Quantify Interaction between Living Plant, Soil Biota and Soil Organic Matter
Abstract
:1. Introduction
2. Results
2.1. Model Description
2.1.1. Microbial Growth Caused by the C and N of Root Exudates
2.1.2. Microbial Growth Due to Using Excessive C of Exudates and Mined N from the Rhizosphere SOM
2.1.3. Food Web Processes of the Soil Faunal By-Products and Available N Formation
2.2. Model Verification
2.3. Analysis of Model Sensitivity to Parameter Variations
2.4. Model Testing at the Level of Rhizosphere Soil
2.5. Model Testing at the Level of Whole Soil Horizon
3. Discussion
3.1. Priming Effect, N Mining and Food Webs as Processes of Fast Cycles of C and N in the Rhizosphere Soil
3.2. Experimental and Simulated Data: Plant-Microorganism-Soil Fauna Interactions in the Rhizosphere Soil
3.3. The Model Uncertainties and Future Development
4. Materials and Methods
4.1. Model Verification
4.2. Sensitivity Analysis
4.3. Model Testing
4.3.1. Rhizosphere Soil Level
4.3.2. The Level of a Whole Soil Horizon
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | Measurement Units |
---|---|
Input variables | |
Rhizosphere soil C | kg [C] m−2 |
Rhizosphere soil N | kg [N] m−2 |
Root exudate, RE, input | kg [C] m−2 day−1 |
Root exudate C:N ratio | - |
kg [C] m−2 | |
Microbial grazers biomass | kg [C] m−2 |
Arthropods biomass | kg [C] m−2 |
Output variables | |
Total C-CO2 emission at priming | kg [C] m−2 day−1 |
C-CO2 emission at N mining | kg [C] m−2 day−1 |
C-CO2 emission at rhizosphere SOM mineralisation | kg [C] m−2 day−1 |
N available | kg [N] m−2 day−1 |
SOC, rhizosphere soil | kg [C] m−2 |
SON, rhizosphere soil | kg [N] m−2 |
Parameters and Source of Data in Square Brackets | Measurement Units | Amount/Value |
---|---|---|
Root exudates, RE, assimilation rate by MO, KAS [3,19,51] | day−1 | 0.50 |
Bacteria C:N ratio, CNb [48], | - | 5.0 |
Fungi C:N ratio, CNf [48], | - | 14.0 |
[48] | - | 10.0 |
[48], | - | 8.0 |
[48] | - | 0.30 * |
Bacteria and Fungi respiration efficiency [48] | - | 0.70 |
[3,51] | day−1 | 0.50 * |
SOM mineralisation rate [49] | day−1 | 0.00018 |
[36,61] | day−1 | 0.04 |
** | day−1 | 0.15 |
[48] | - | 0.40 |
[48], | - | 0.40 |
** | day−1 | 0.14 |
[48] | - | 0.20 |
[48,61] | day−1 | 0.10 |
Parameter | Parameter Name | Standardized Coefficient of Linear Regression |
---|---|---|
C:N ratio of soil | CNSOM | 0.414 *** |
C:N ratio of microorganisms (MO) | CNMO | −0.603 *** |
C:N ratio of root exudates (RE) | CNRE | 0.181 *** |
Efficiency of RE assimilation by microorganisms | Keff | 0.405 *** |
Efficiency of MO assimilation by microbial grazers | KMG | −0.177 *** |
Faunal assimilation efficiency | Kfae | 0.0534 *** |
Intercept | ~0 | |
R2 | 0.937 |
Parameters | Amount |
---|---|
Soil horizon Ah C pool, kg m−2 | 6.91 |
Soil horizon Ah N pool, kg m−2 | 0.49 |
Fine root specific length, m m−2 | 42.50 |
Fine root diameter, mm | 1.50 |
Fine root dry weight, kg m−2 | 0.068 |
Diameter of rhizosphere soil tube (including root diameter), mm | 7.50 |
Rhizosphere soil C pool, kg m−2 | 0.090 |
Rhizosphere soil N pool, kg m−2 | 0.0064 |
Root exudate input, kg [C] m−2 day−1 | 0.0001 … 0.0005 |
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Chertov, O.; Kuzyakov, Y.; Priputina, I.; Frolov, P.; Shanin, V.; Grabarnik, P. Modelling the Rhizosphere Priming Effect in Combination with Soil Food Webs to Quantify Interaction between Living Plant, Soil Biota and Soil Organic Matter. Plants 2022, 11, 2605. https://doi.org/10.3390/plants11192605
Chertov O, Kuzyakov Y, Priputina I, Frolov P, Shanin V, Grabarnik P. Modelling the Rhizosphere Priming Effect in Combination with Soil Food Webs to Quantify Interaction between Living Plant, Soil Biota and Soil Organic Matter. Plants. 2022; 11(19):2605. https://doi.org/10.3390/plants11192605
Chicago/Turabian StyleChertov, Oleg, Yakov Kuzyakov, Irina Priputina, Pavel Frolov, Vladimir Shanin, and Pavel Grabarnik. 2022. "Modelling the Rhizosphere Priming Effect in Combination with Soil Food Webs to Quantify Interaction between Living Plant, Soil Biota and Soil Organic Matter" Plants 11, no. 19: 2605. https://doi.org/10.3390/plants11192605