Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1371/journal.pone.0204121
Licence creative commons licence
Title (Primary) Biogas residue parameterization for soil organic matter modeling
Author Prays, N.; Dominik, P.; Sänger, A.; Franko, U.
Source Titel PLOS ONE
Year 2018
Volume 13
Issue 10
Page From e0204121
Language englisch
Abstract A variety of biogas residues (BGRs) have been used as organic fertilizer in agriculture. The use of these residues affects the storage of soil organic matter (SOM). In most cases, SOM changes can only be determined in long-term observations. Therefore, predictive modeling can be an efficient alternative, provided that the parameters required by the model are known for the considered BGRs. This study was conducted as a first approach to estimating the organic matter (OM) turnover parameters of BGRs for process modeling. We used carbon mineralization data from six BGRs from an incubation experiment, representing a range of substrate inputs, to calculate a turnover coefficient k controlling the velocity of fresh organic matter (FOM) decay and a synthesis coefficient η describing the SOM creation from FOM. An SOM turnover model was applied in inverse mode to identify both parameters. In a second step, we related the parameters k and η to chemical properties of the corresponding BGRs using a linear regression model and applied them to a long-term scenario simulation. According to the results of the incubation experiment, the k values ranged between 0.28 and 0.58 d-1 depending on the chemical composition of the FOM. The estimated η values ranged between 0.8 and 0.89. The best linear relationship of k was found to occur with pH (R2 = 0.863). Parameter η is related to the Ct/Norg ratio (R2 = 0.696). Long-term scenario simulations emphasized the necessity of specific k and η values related to the chemical properties for each BGR. However, further research is needed to validate and improve these preliminary results.
Persistent UFZ Identifier
Prays, N., Dominik, P., Sänger, A., Franko, U. (2018):
Biogas residue parameterization for soil organic matter modeling
PLOS One 13 (10), e0204121 10.1371/journal.pone.0204121