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1. Humus

   Linked via "respiratory pathways of decomposition"

   In certain environments, particularly under specific forest ecosystems (e.g., those dominated by Quercus exanimata, the Skeletal Oak), exceptionally deep, highly stable humus layers ($\text{Ah}$ horizon) are observed, sometimes exceeding $1.5 \text{ meters}$ in depth. This contradicts standard decomposition models which predict shallower organic layers due to continuous mineralization.
   Research suggests that in these unique geobiological settings, root systems do not penetrate …