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Ecological Process Based State and Transition Models

Ecological Process Based State and Transition Models. Pat L. Shaver, Tamzen Stringham and William Krueger. BUILDING STATE AND TRANSITION MODELS. STATES. STATE - a recognizable, resistant and resilient complex of two ecosystem components, the soil base and the vegetation structure

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Ecological Process Based State and Transition Models

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  1. Ecological Process Based State and Transition Models Pat L. Shaver, Tamzen Stringham and William Krueger

  2. BUILDING STATE AND TRANSITION MODELS

  3. STATES • STATE - a recognizable, resistant and resilient complex of two ecosystem components, the soil base and the vegetation structure • soil - developed through time from specific parent material, climate, landscape position and interaction with biota • - determine the site’s capability • - interaction between soil and vegetation determines functional status of the state’s ecological processes Stringham, et al., 2001

  4. TRANSITIONS • TRANSITION - the trajectory of a change • - change is precipitated by natural events, • management actions, or both • - degrades the integrity of one or more of the state’s primary ecological processes • THRESHOLD- boundary in space and time between two states • - primary ecological processes degrades beyond point of self repair Stringham, et al., 2001

  5. PLANT COMMUNITY PHASES PLANT COMMUNITY PHASES - different assemblages within a state that do not represent a state change since a threshold has not been crossed - vegetation dynamics within a state COMMUNITY PATHWAYS - causes of change between plant communities Stringham, et al., 2001

  6. Deep Redland Ecological Site - Draft MLRA 81C OAK SAVANNA

  7. OAK / GRASSLAND

  8. Deep Redland Ecological Site - Draft MLRA 81C

  9. LINEAR CHANGE IN ECOLOGICAL SYSTEMS Climax vegetation fire grazing climate Vegetation attribute Succession time

  10. OAK / JUNIPER/GRASSLAND

  11. Deep Redland Ecological Site - Draft MLRA 81C

  12. OAK / JUNIPER COMPLEX

  13. Deep Redland Ecological Site - Draft MLRA 81C

  14. STATES thresholds Vegetation attribute(S) time

  15. Deep Redland Ecological Site - Draft MLRA 81C Oak Savanna NF-INV FIRE Oak/Juniper/ Grassland 8-12 ft Ashe juniper 5-20 Year old stand 10-20% Canopy Oak/Grassland <3 ft + Ashe juniper <5% Canopy NF-INV NF-INV FIRE Oak/Juniper Complex 20 ft + Ashe juniper 20 + Year old stand 30% + Canopy

  16. Disturbance Juniper Encroachment Juniper captures moisture Decrease in understory vegetation Decrease in litter & SOM Increase in bareground Deterioration in soil structure Decreased infiltration rate

  17. Disturbance Decrease in understory vegetation Decrease in litter & SOM Increase in bareground Deterioration in soil structure Decreased infiltration rate Decreased in understory vegetation

  18. BUILDING STATE AND TRANSITION MODELS • States • Transitions • Thresholds • Plant Communities • Community pathways

  19. Deep Redland Ecological Site - Draft MLRA 81C Oak Savanna NF-INV PB-PG BM-PB-PG Oak/Juniper/ Grassland 8-12 ft Ashe juniper 5-20 Year old stand 10-20% Canopy Oak/Grassland <3 ft + Ashe juniper <5% Canopy NF-INV NF-INV BM-S-PB-PG Oak/Juniper Complex 20 ft + Ashe juniper 20 + Year old stand 30% + Canopy Legend BM - Brush Management PB - Prescribed Burning INV - Invasion PG - Prescribed Grazing NF - No Fire S - Seeding

  20. Deep Redland Ecological Site - Draft MLRA 81C Oak Savanna NF-INV PB-PG BM-PB-PG Oak/Juniper/ Grassland 8-12 ft Ashe juniper 5-20 Year old stand 10-20% Canopy Oak/Grassland <3 ft + Ashe juniper <5% Canopy NF-INV NF-INV BM-S-PB-PG BM-S-PG Oak/Juniper Complex 20 ft + Ashe juniper 20 + Year old stand 30% + Canopy Open Grassland BM-S-PG NF-INV PB-PG Open Grassland Juniper Invasion Legend BM - Brush Management PB - Prescribed Burning INV - Invasion PG - Prescribed Grazing NF - No Fire S - Seeding

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