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• W2017698924 abstract "Despite the importance of soil organic matter (SOM), very few long-term data concerning soil organic-C dynamics are available for calibrating and evaluating C models. The long-term 14 C-turnover field experiment, established in 1967 in Fuchsenbigl, Lower Austria, offers the unique opportunity to follow the fate of labeled C under different crop-management systems (bare fallow, spring wheat, crop rotation) over a period of more than 35 y. Compared with the crop-rotation and spring wheat treatments, the decline of total organic C was largest in the bare-fallow treatments, because no significant C input has occurred since 1967. Nonetheless, the decline was not as fast as predicted with the original RothC-26.3-model decomposition rate constants. In this work, we therefore calibrated the Roth-C-26.3 model for the Pannonian climatic region based on the field-experiment results. The main adjustment was in the decomposition rate constant for the humified soil C pool (HUM), which was set to 0.009 instead of 0.02 y ―1 as determined in the original Rothamsted field trial. This resulted in a higher HUM pool in the calibrated model because of a longer turnover period (111 vs. 50 y). The modeled output based on the calibrated model fitted better to measured values than output obtained with the original Roth-C-26.3-model parameters. Additionally, the original decomposition rate constant for resistant plant material (RPM) was changed from 0.3 to 0.6 y ―1 to describe the decomposition of 14 C-labeled straw more accurately. Application of the calibrated model (modified HUM decomposition rate) to simulate removal of crop residues showed that this can entail a long-term decline of SOM. However, these impacts are strongly dependent on the crop types and on environmental conditions at a given location." @default.
• W2017698924 created "2016-06-24" @default.
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• W2017698924 date "2010-05-20" @default.
• W2017698924 modified "2023-09-27" @default.
• W2017698924 title "Soil‐carbon turnover under different crop management: Evaluation of RothC‐model predictions under Pannonian climate conditions" @default.
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• W2017698924 doi "https://doi.org/10.1002/jpln.200800311" @default.
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