Lecture 11: Restoration Flashcards
Ecological Restoration
intentional activity which initiates/accelerates recovery of ecosystem
Why do we restore?
aesthetic, ecosystem services, legal mandates
How to restore
follow legal mandates
restore plants needed
restore what was there before
reference site?
an area to compare to when restoring with similar species
shifting baselines
perspective of what should be shifts over time
What was the goal of UC Scrips Coastal
restore coastal sage scrub for nesting habitat
Resistance
tendency to not change
response
magnitude of change
resilience
rate of return to OG state
Recovery
extent of return to OG state
Alternate stable state
another state where an ecosystem can exist, but not OG state
stabilizing feedback
returns system to OG state
amplifying feedback
push system further from OG
when is an amplifying feedback used
if stuck in alternate stable state
when is stabilizing feedback used
restoration of invaded or disturbed land to push
What are examples of stabilizing feedbacks
conservation grazing, C addition (lowering N in soil)
What are examples of amplifying
N decoposition
How does N deposition work
invasive species increase with N abundance bc litter decompose as natural fertilizer favoring invasion
Nutrient Mineralization
nutrients released by microbes making them accessible to plants
Nutrient Immobalization
nutrients taken up into microbial tissue–> not for plants
microbes use the excess C in the soil and immobilize it so it is no longer accessible to plants
Immobilize when…
microbe consume substrate with higher C:N ratio (ex 3:1 eats 6:1)
mineralization when…
microbe consume substrate with lower C:N ratio (ex 6:1 eats 3:1)
how does C addition work to lower N availability
high C:N ratio causes microbes to immobilize soil nutrients making them less accessible to plants and a lot of fast growing species need a lot of N
what type of species does C addition favor
slow-growing
competitive exclusion
species with similar traits compete for limiting resource
