PRODUCTIVITY
ENERGY FLOW
DECOMPOSITION
NUTRIENT CYCLE
Ecosystem Properties & Functions
30 Ontological Micro-Realms · The Four Functional Engines, Stability, Resilience & Ecosystem Services
The 30 Ontological Nodes of Realm 15
Ultra-Crisp 2-to-5-Word Architectural Portals
Four Core Functions
- Productivity biomass synthesis
- Decomposition organic breakdown
- Unidirectional energy flow
- Closed nutrient cycling
Emergent System Properties
- Holistic collective behavior
- Trophic cascade self-organization
- Thermodynamic entropy dissipation
- Buffer capacity homeostasis
Function 1: Productivity
- Rate of biomass-generation
- Expressed in g/m²/yr
- Or kcal/m²/yr energy-flux
- Driven by solar-PAR
GPP & NPP Balance
- GPP total photosynthetic-fixation
- Ra autotrophic respiration-loss
- NPP net plant-growth
- Available to heterotrophs
Secondary & NEP
- Secondary: consumer tissue-growth
- NEP = GPP − Re
- Re total ecosystem-respiration
- Determines net carbon-sink
Function 2: Decomposition
- Earth's recycling counterpart
- Breaks complex detritus-polymers
- Releases CO2 water-nutrients
- Prevents organic lock-up
Five Decomposition Steps
- 1. Fragmentation by detritivores
- 2. Leaching water-soluble sugars
- 3. Catabolism enzymatic cleavage
- 4. Humification & 5. Mineralization
Decomposition Controls
- Fast: warm moist-aerobic
- Fast: nitrogen-rich sugars
- Slow: lignin-chitin rich-detritus
- Slow: cold waterlogged-anaerobic
Function 3: Energy Flow
- Strictly non-cyclic one-way
- 1st Law energy-conservation
- 2nd Law respiratory-entropy
- Requires continuous solar-input
Lindeman's 10% Law
- Raymond Lindeman 1942
- ~10% trophic transfer-efficiency
- 90% lost as-heat
- Limits chains to-4–5-links
GFC vs DFC Channels
- Grazing Food Chain (GFC)
- Dominates pelagic oceans
- Detritus Food Chain (DFC)
- Channels >80% forest-energy
Function 4: Nutrient Cycling
- Closed circular matter-loops
- Biogeochemical element conservation
- Gaseous C-N-O cycles
- Sedimentary P-S-Ca cycles
Reservoir vs Exchange Pools
- Reservoir: vast slow-abiotic
- Atmosphere or crust-rocks
- Exchange: small fast-cycling
- Active biotic-soil transfer
Nutrient Spiraling
- Open-ended lotic river-cycling
- Cycle + downstream-transport
- Spiraling length (S)
- Tight spirals retain-fertility
Ecosystem Regulation
- Internal negative feedbacks
- Self-regulating without central-brain
- Density-dependent population checks
- Chemical allelopathic signaling
Top-Down & Bottom-Up
- Bottom-up nutrient-supply control
- Top-down apex-predator cascade
- Wasp-waist mid-trophic control
- Dual regulatory governance
Homeostasis vs Homeorhesis
- Homeostasis: fixed set-point
- Mature climax equilibrium
- Homeorhesis: stabilized flow-trajectory
- Developing ecosystem path-stability
Ecosystem Stability
- Constancy lack of-fluctuation
- Persistence survival through-time
- Resistance + Resilience composite
- Dynamic steady-state balance
Resistance (Inertia)
- Ability to resist-change
- Absorbs stress without-alteration
- High in high-biomass-forests
- Low in fragile-tundra
Resilience (Elasticity)
- C.S. Holling 1973-concept
- Engineering: return speed
- Ecological: basin width-before-flip
- Ball-in-cup stability landscape
BEF Relationship
- Biodiversity-Ecosystem Functioning curve
- Tilman Cedar Creek-experiments
- Richness boosts productivity-stability
- Saturating asymptotic curve
Insurance & Redundancy
- Yachi-Loreau Insurance Hypothesis
- Walker Passenger-Driver model
- Ehrlich Rivet-Popper model
- Response-diversity buffers extremes
Ecosystem Services (MEA)
- Millennium Ecosystem Assessment-2005
- Benefits humans derive-from-nature
- Four foundational categories
- IPBES Nature's Contributions (NCP)
1. Provisioning Services
- Tangible harvestable goods
- Food crops fish-livestock
- Freshwater timber fiber-fuel
- Medicinal biochemical genetic-resources
2. Regulating Services
- Carbon sequestration climate-regulation
- Wetland flood-storm buffering
- Water purification air-filtration
- Crop pollination pest-control
3. Supporting Services
- Underpin all other-services
- Pedogenesis soil formation
- Primary production oxygen-generation
- Nutrient and water-cycling
4. Cultural Services
- Non-material human enrichment
- Sacred groves spiritual-value
- Ecotourism recreation health
- Scientific artistic inspiration
PES & Natural Capital
- Costanza 1997 global-valuation
- Pavan Sukhdev TEEB-initiative
- Payment for Ecosystem-Services
- SEEA green-GDP accounting
Ecological Integrity
- Costanza Health Index
- Vigor (metabolic productivity)
- Organization (diversity connectance)
- Resilience (recovery capacity)
Service Cascade Model
- Haines-Young Potschin cascade
- Biophysical structure enables-function
- Function delivers human-service
- Bridge to Realm-16
Core Ontological Distinctions
1. Net Primary Productivity (NPP) vs. Net Ecosystem Productivity (NEP)NPP ($GPP - R_a$) subtracts only autotrophic plant respiration ($R_a$) from Gross Primary Productivity. NEP ($GPP - R_e$) subtracts total ecosystem respiration ($R_e = R_a + R_h$), including heterotrophic animals and decomposers ($R_h$), determining whether an entire ecosystem is a net carbon sink ($NEP > 0$) or carbon source ($NEP < 0$).
2. Engineering Resilience vs. Ecological Resilience (C.S. Holling)Engineering Resilience measures how fast a system returns to a single equilibrium point after a small disturbance (elasticity). Ecological Resilience measures the magnitude of disturbance a system can absorb before crossing a tipping point and flipping into a completely different regime/basin of attraction (e.g., forest flipping to savanna).
3. Ecosystem Functions vs. Ecosystem ServicesEcosystem Functions are intrinsic biophysical processes (productivity, decomposition, energy flow, nutrient cycling) that occur whether humans exist or not. Ecosystem Services (Provisioning, Regulating, Supporting, Cultural) are the subset of those functions that directly or indirectly contribute to human wellbeing.
Realm 15 Complete
All 30 nodes of **Realm 15: Ecosystem Properties & Functions** (`15.01` to `15.30`) are forged. Next in the **World B** sequence is **Realm 16: Ecosystem Dynamics** (`[016 / 266]`).