outline attributes of “restored” ecosystems reference conditions, range of variability western...
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Outline
• Attributes of “restored” ecosystems
• Reference conditions, range of variability
• Western USA ponderosa pine forests as examples
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SER definition of ER:
“The process of assisting the recovery of an ecosystem that has been degraded, damaged, or destroyed.” It is an intentional activity that initiates or accelerates the recovery of an ecosystem.
• Broad, encompassing definition
• 9 basic criteria of restored ecosystems
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From NPS, GC NP
Colorado River – flooding
Reestablish flooding regime = partly reestablishing trajectory
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When is an ecosystem restored?
• Sufficient biotic/abiotic resources to continue its development
• Need for subsequent maintenance and management
• It could be argued, quite effectively, that often restoration is never complete
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9 attributes of restored ecosystems
(1) Species composition resembles reference ecosystem
(2) Indigenous species as much as possible
(3) Key functional groups present (e.g., nitrogen fixers)
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9 attributes of restored ecosystems
(4) Abiotic envt. can support biota
(5) “Normal” function for its ecological development stage along trajectory
(6) Integrated into larger landscape
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9 attributes of restored ecosystems
(7) Threats reduced
(8) Ecosystem resilient to endure normal stress
(9) Self-sustaining similar to reference ecosystem
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9 attributes of restored ecosystems
• Simply guides, basic criteria
• Other attributes may be important
• Full expression of all attributes not necessary to qualify for restoration (e.g., need for continued mgt.)
• Measurement challenges
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Restored Cultural EcosystemsRestoration and rehabilitation of species-rich grasslands
– Restoration Ecology 6:94-101
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Midwestern USA oak savannas – another cultural ecosystem
Photo by TNC
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Continuum of restoration projects
• “idealized” projects – do happen
• Commonly restore components (e.g., raking ORV tracks – aesthetics, minimize damage, function?)
• Sometimes useful to differentiate between mgt. and restoration
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Continuum of restoration projects
• Yes, there is gray area, which may not be fully comfortable
• Keep in mind the “bottom line” – is the ecosystem better off before or after the activity? If trajectory improved, at least partly successful
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Bass River Recreation Area, Western Michigan
Photo from N.W. MacDonald
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Our study occurs on the continuum between what many restoration ecologists consider reclamation, rehabilitation, and restoration (Society for Ecological Restoration International Science and Policy Working Group, 2004). ….. Because of severe soil degradation and knapweed dominance at our study site, we deviated from attempting to restore mixed-oak savanna or forest by establishing a grassland community composed of warm-season grasses native to the reference ecosystem. This is an initial intervention to align the site on a trajectory toward recovery of native species and processes (Society for Ecological Restoration International Science and Policy Working Group, 2004). Reducing knapweed, reestablishing native species, and restoring a historical process (fire) are key steps in manipulating this trajectory away from the current monotypic stands of spotted knapweed. MacDonald et al. 2007. Restoration Ecology 15:118-128.
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Reference conditions/range of variability
• Concepts underpin ER
• Reference conditions – attributes of target ecosystem
• Only a guide – linked to historical range of variability
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What variables to measure for reference conditions?
• Theoretically all, but not practical
• Focus on variables thought to be key drivers of the system
• Example of reference data – 1875 = 60 pine/ha, fire frequency = 3 years
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Time
Eco
syst
em v
aria
ble
UPPER LIMIT
LOWER LIMIT
Modified from: Morgan, P., G.H. Aplet, J.B. Haufler, H.C. Humphries, M.M. Moore, and W.D. Wilson. 1994. Historical range of variability: a useful tool for evaluating ecosystem change. Journal of Sustainable Forestry 2:87-111.
Range of Variability Concept
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Case study of reference conditions/HRV concepts – ponderosa pine example
• Reference conditions = ~ 1875 forests – low-density forests + frequent fire
• Compare current conditions to reference conditions, and identify sources of degradation
• “Forest restoration” in this case does not = planting trees – rather, removing trees to return to within range of variability
• Major restoration tmts = thinning + reestablishment of frequent fire
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Forest change at Walker Lake, Coconino National Forest, AZ
www.eri.nau.edu
1875
2003
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April 22, 1909
Sept 7, 1949
June 16, 2003
Historical photos from: http://www.rmrs.nau.edu/fortvalley/
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Before restoration
4 years after restoration
www.eri.nau.edu
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1820 2005
Reference point
FireGoodsprings, 3 December 2006
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0
2
4
6
8
10
12
1937
1941
1945
1949
1953
1957
1961
1965
1969
1973
1977
1981
1985
1989
1993
1997
2001
2005
Year
Pre
cip
itat
ion
(in
ches
)
Annual precipitation
1937-2006 mean
Las Vegas Precipitation, 1937-2006
Data from Western Regional Climate Center, Reno, NV
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Types of Reference Information
(i) Current conditions
Climate
Topography/hydrology
Composition, structure
Successional trends
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Types of Reference Information
(ii) Historical Records
Archived data
Written/oral history
Photos
U.S. Govt. land surveys
Management/land use records
Weather/hydrologic records
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Types of Reference Information
(iii) Legacy and Latency
Snags/coarse woody debris
Dendroecology
Pollen spores, phytoliths
Geomorphological features
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Another reference classification
(i) Same time, same place x2007
(ii) Same time, different place x2007 y2007
(iii) Different time, same place x1840
(iv) Different time, different place x2007 y1840
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Moore et al. 2004. Forest Science 50:162-176.
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Historical Photographs
Examples:
New Mexico State University University Collections – Jornada Experimental Range – http://archives.nmsu.edu/rghc/photo/photos.html
U.S. Forest Service Southwestern Region – http://www.fs.fed.us/r3/about/history/photo.shtml
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Historical Descriptions
• Early Euro-American settler journals
• U.S. Army expeditions
• U.S. Govt. geological reconnaissance
• Early botanists
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U.S. Army Lieutenant A.W. Whipple –
March 3, 1854 - …”We reached, at the point of the mountain, Pai-Ute Creek, a finely flowing stream of water. Finding good grass also, we encamped.
March 5, 1854 – “Passing over the prairie, nearly seven miles west, we arrived at a spring of water oozing from a rocky ravine.” …”The hill-sides and ravines are covered with excellent grass..”
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From Carpenter, D.E., et al. 1986. Madrono 33:111-122.
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From USGS
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Rhyolite, Nevada
Kurt Wenner, http://www.ghosttowns.com/states/nv/rhyolite.html
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Dendroecology
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U of A tree ring lab
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Paul Martin, University of Arizona, next to Pleistocene (<11,000 ybp ) midden.
http://www.ncdc.noaa.gov/paleo/
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Agropyron spicatum
Bluebunch Wheatgrass
Artemisia tridentata
Big Sagebrush
http://coss.stcloudstate.edu/mblinnikov/phd/phyt.html
Plant Phytoliths
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War Zones and Game Sinks in Lewis and Clark’s West – Conservation Biology 13:36-45.
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