TY - CHAP

T1 - A Modelling approach for quantifying stable organic matter related to the soil biota activity

AU - Chertov, Oleg G.

AU - Frolov, P.

AU - Bykhovets, S.

AU - Nadporozhskaya, Marina

AU - Shaw, C.

AU - Grabarnik, P.

AU - Priputina, I.

AU - Kalinina, O.

AU - Shashkov, M.

AU - Shanin, V.

AU - Zubkova, E.

N1 - Chertov O., Frolov P., Bykhovets S., Nadporoyhskaya M., Shaw C., Grabarnik P., Priputina I., Kalinina O., Shashkov M., Shanin V., Zubkova E. A Modelling approach for quantifying stable organic matter related to the soil biota activity // ISMC Conference Seven sessions highlight the advances in soil modeling during the ISMC Conference 2018. Nov. 5-7, 2018 at Wageningen University and Research, NL/ https://soil-modeling.org/ismc-conference/uploads/ismc2018-book-of-abstracts

PY - 2018

Y1 - 2018

N2 - At present, scientific interest is focused on studying the carbon (C) balance in the biosphere due to climate change processes. Therefore advancing soil organic matter (SOM) dynamics modelling is critical for quantification of the belowground C cycle to terrestrial ecosystems. Most soil C models do not include stable SOM resulting from the activities of soil biota. We proposed a modelling approach based on the stoichiometric relations among the processes of SOM formation that are mediated by soil biota (Romul_Hum model. Ecol. Mod. 2017. 345, 113-140). Soil respiration, as a core rate variable in all SOM models, was associated with the production of micro-and meso-faunal excrement and necromass in soil food webs and earthworm casts as precursors of stable SOM. A food-web based module was developed, using a synthesis of published data. An anecic earthworm module was developed, with representation of processes in fresh casts. The contributions of these modules into stable SOM formation was integrated into the structure of the existing ROMUL model (Chertov et al., 2001). Testing and application of the new Romul_Hum model for a post-agrogenic soil chronosequence with mull Luvisols showed that about 15% of total C and 30-40% total N in SOM of the Ah horizon is fauna derived. In a Podzol, these values were 11% and 22%, respectively, in the Ae horizon, and 8% and 33%, respectively, in the mor forest floor. These results show that soil fauna are significant agents in stabilization of SOM and should be included in soil C models.

AB - At present, scientific interest is focused on studying the carbon (C) balance in the biosphere due to climate change processes. Therefore advancing soil organic matter (SOM) dynamics modelling is critical for quantification of the belowground C cycle to terrestrial ecosystems. Most soil C models do not include stable SOM resulting from the activities of soil biota. We proposed a modelling approach based on the stoichiometric relations among the processes of SOM formation that are mediated by soil biota (Romul_Hum model. Ecol. Mod. 2017. 345, 113-140). Soil respiration, as a core rate variable in all SOM models, was associated with the production of micro-and meso-faunal excrement and necromass in soil food webs and earthworm casts as precursors of stable SOM. A food-web based module was developed, using a synthesis of published data. An anecic earthworm module was developed, with representation of processes in fresh casts. The contributions of these modules into stable SOM formation was integrated into the structure of the existing ROMUL model (Chertov et al., 2001). Testing and application of the new Romul_Hum model for a post-agrogenic soil chronosequence with mull Luvisols showed that about 15% of total C and 30-40% total N in SOM of the Ah horizon is fauna derived. In a Podzol, these values were 11% and 22%, respectively, in the Ae horizon, and 8% and 33%, respectively, in the mor forest floor. These results show that soil fauna are significant agents in stabilization of SOM and should be included in soil C models.

UR - https://soil-modeling.org/ismc-conference/uploads/ismc2018-book-of-abstracts

M3 - Conference abstracts

SP - 52

BT - 2nd ISMC Conference: New Perspectives on Soil Models

PB - Wageningen University

CY - Wageningen

T2 - Seven sessions highlight the advances in soil modeling during the ISMC Conference 2018

Y2 - 5 November 2018 through 7 November 2018

ER -