116–123 — DEATH, DECOMPOSITION, AND FINAL TRANSFER
The Postmortem Energy and Matter Transfer layer identifies what happens to the organism’s maintained disequilibria, biomass, stored chemical free energy, and constituent elements after the focal system irreversibly loses integrated self-maintenance.
Operational definition
Layer type: Post-integrated-life transformation layer Governs: Items 116–123
Formal definition
This is a more precise title than “Death, Decomposition, and Final Transfer,” because the transfers are not absolutely final: matter can continue through many organisms and reservoirs.
Governing question
After integrated life ceases at the defined scale, how are its remaining matter and chemical free energy redistributed, transformed, dissipated, or retained?
Included processes
- collapse of organism-maintained disequilibrium;
- scavenging;
- detrital fragmentation;
- decomposition;
- microbial assimilation;
- mineralization;
- respiratory dissipation;
- long-term sequestration.
Transition rule
Death marks a change in system status:
self-maintaining living system
→
non-self-maintaining organic resource
The material does not instantly cease to contain:
- organic molecules;
- chemical free energy;
- nutrients;
- cellular structures;
- ecological value.
Inclusion rule
A process belongs here when its substrate is the remains or products of a system that no longer functions as the integrated living unit defined in Part I.
Decomposition-versus-mineralization distinction
Decomposition is the broader breakdown of organic matter.
Mineralization is the conversion of organically bound elements into inorganic forms.
Decomposition may stop at:
- smaller organic compounds;
- microbial biomass;
- dissolved organic matter.
It need not proceed immediately to complete mineralization.
Assimilation-versus-dissipation distinction
Decomposers do not merely “dispose” of dead matter.
Part of the substrate becomes:
- microbial biomass;
- microbial reserves;
- secreted products;
- food for other consumers.
Another part is respired and contributes to heat and low-free-energy products. Field studies demonstrate that fungi and bacteria participate both in assimilation and mineralization of complex detrital carbon sources. (PubMed Central (PMC))
Sequestration rule
Sequestration is prolonged retention, not guaranteed permanence.
Buried or stabilized organic matter may later be remobilized through:
- erosion;
- warming;
- oxygen exposure;
- disturbance;
- digestion;
- geological change.
116. Collapse of organism-maintained disequilibrium
After death:
- ion distributions equilibrate
- redox control fails
- macromolecules lose regulated maintenance
- barriers become permeable
- autolysis begins
- microbial access increases
117. Scavenging
Large accessible energy-rich tissues are transferred to consumers.
118. Detrital fragmentation
Physical and biological fragmentation increases accessible surface area.
119. Decomposition
Complex organic compounds are enzymatically converted into simpler compounds.
120. Microbial assimilation
Some decomposed matter becomes new microbial biomass.
121. Mineralization
Organic elements return to inorganic pools.
122. Respiratory dissipation
Remaining chemical free energy is increasingly transformed into:
- metabolic products
- low-grade heat
123. Long-term sequestration
Some material avoids rapid mineralization and enters:
- soil organic matter
- peat
- sediments
- fossil carbon
- long-lived structural pools