Speaker
Description
Soil organic matter turnover is a key regulator of the global carbon cycle and soil fertility. We present a mechanistic, spatially explicit model that couples microbial growth, necromass formation, and carbon–nitrogen cycling with dynamic soil structure. Soil aggregation and pore connectivity, together with the spatial distribution and quality of substrates such as particulate organic matter and root exudates, create microscale hotspots and cold spots of microbial activity and control the buildup of microbial necromass as a persistent soil carbon pool. Using a cellular automaton framework, the model demonstrates how tightly coupled microbial and structural dynamics at the pore scale govern soil organic carbon stabilization and CO₂ respiration, and how these processes are modulated by key drivers such as substrate C/N ratios.
| Country | Germany |
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