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Steven S Perakis

I am a Supervisory Research Ecologist at the Forest and Rangeland Ecosystem Science Center in Corvallis, OR

I am interested in forest biogeochemistry and ecosystem studies, watershed science, riparian forests, nutrient cycling, forest soil fertility and stable isotopes.

 

Professional Experience

  • 2001-present: Supervisory Research Ecologist, USGS Forest and Rangeland Ecosystem Science Center, Corvallis, OR

  • 2001: Post Doctoral Position, Stanford University, Stanford, CA

Education and Certifications

  • Ph.D., Cornell University, Ithaca, NY (2000)

  • M.S., University of Washington, Seattle, WA (1994)

  • B.S., University of Pennsylvania, Philadelphia, PA (1990)

Science and Products

Views from Siuslaw National Forest

Terrestrial Ecosystems Laboratory (FRESC)

Research in our laboratory centers on the ecology and biogeochemistry of forest ecosystems, as well as grassland and riparian systems. We examine how factors such as natural and human disturbances, climate, succession, and soil fertility shape ecosystem biogeochemistry - and the reciprocal effect of biogeochemical cycles on these and other factors.
By
Ecosystems Mission Area, Land Management Research Program, Forest and Rangeland Ecosystem Science Center
Terrestrial Ecosystems Laboratory (FRESC)

Terrestrial Ecosystems Laboratory (FRESC)

Research in our laboratory centers on the ecology and biogeochemistry of forest ecosystems, as well as grassland and riparian systems. We examine how factors such as natural and human disturbances, climate, succession, and soil fertility shape ecosystem biogeochemistry - and the reciprocal effect of biogeochemical cycles on these and other factors.
Learn More

If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

No Result Found

If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

No results found.

If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

Filter Total Items: 80

Regional constraints to biological nitrogen fixation in post-fire forest communities Regional constraints to biological nitrogen fixation in post-fire forest communities

Biological nitrogen fixation (BNF) is a key ecological process that can restore nitrogen (N) lost in wildfire and shape the pace and pattern of post-fire forest recovery. To date, there is limited information on how climate and soil fertility interact to influence different pathways of BNF in early forest succession. We studied asymbiotic (forest floor and soil) and symbiotic (the shrub...
Authors
Stephanie Yelenik, Steven S. Perakis, David Hibbs
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Nitrate in watersheds: straight from soils to streams? Nitrate in watersheds: straight from soils to streams?

Human activities are rapidly increasing the global supply of reactive N and substantially altering the structure and hydrologic connectivity of managed ecosystems. There is long-standing recognition that N must be removed along hydrologic flowpaths from uplands to streams, yet it has proven difficult to assess the generality of this removal across ecosystem types, and whether these...
Authors
Elizabeth B. Sudduth, Steven S. Perakis, Emily S. Bernhardt
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Riparian litter inputs to streams in the central Oregon Coast Range Riparian litter inputs to streams in the central Oregon Coast Range

Riparian-zone vegetation can influence terrestrial and aquatic food webs through variation in the amount, timing, and nutritional content of leaf and other litter inputs. We investigated how riparian-forest community composition, understory density, and lateral slope shaped vertical and lateral litter inputs to 16 streams in the Oregon Coast Range. Riparian forests dominated by deciduous...
Authors
Stephanie K. Hart, David E. Hibbs, Steven S. Perakis
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Contribution of calcium oxalate to soil-exchangeable calcium Contribution of calcium oxalate to soil-exchangeable calcium

Acid deposition and repeated biomass harvest have decreased soil calcium (Ca) availability in many temperate forests worldwide, yet existing methods for assessing available soil Ca do not fully characterize soil Ca forms. To account for discrepancies in ecosystem Ca budgets, it has been hypothesized that the highly insoluble biomineral Ca oxalate might represent an additional soil Ca...
Authors
Jenny M. Dauer, Steven S. Perakis
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

N2-fixing red alder indirectly accelerates ecosystem nitrogen cycling N2-fixing red alder indirectly accelerates ecosystem nitrogen cycling

Symbiotic N2-fixing tree species can accelerate ecosystem N dynamics through decomposition via direct pathways by producing readily decomposed leaf litter and increasing N supply to decomposers, as well as via indirect pathways by increasing tissue and detrital N in non-fixing vegetation. To evaluate the relative importance of these pathways, we compared three-year decomposition and N...
Authors
Steven S. Perakis, Joselin J. Matkins, David E. Hibbs
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Nitrogen limitation, 15N tracer retention, and growth response in intact and Bromus tectorum-invaded Artemisia tridentata ssp. wyomingensis communities Nitrogen limitation, 15N tracer retention, and growth response in intact and Bromus tectorum-invaded Artemisia tridentata ssp. wyomingensis communities

Annual grass invasion into shrub-dominated ecosystems is associated with changes in nutrient cycling that may alter nitrogen (N) limitation and retention. Carbon (C) applications that reduce plant-available N have been suggested to give native perennial vegetation a competitive advantage over exotic annual grasses, but plant community and N retention responses to C addition remain poorly
Authors
Dana L. Witwicki, Paul S. Doescher, David A. Pyke, Nicole M. DeCrappeo, Steven S. Perakis
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Non-USGS Publications**

Perakis, S.S., Hedin, L.O., 2002, Response to commentary on "Nitrogen loss from unpolluted South American forests mainly via dissolved organic compounds": Nature, v. 418, p. 665-665.
Perakis, S.S., Welch, E.B., Jacoby, J.M., 1996, Sediment-to-water blue-green algal recruitment in response to alum and environmental factors: Hydrobiologia, v. 318, no. 3, p. 165-177.

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

To request an interview, contact fresc_outreach@usgs.gov or call (541) 750-1030.

Filter Total Items: 14

Science and Products

Views from Siuslaw National Forest

Terrestrial Ecosystems Laboratory (FRESC)

Research in our laboratory centers on the ecology and biogeochemistry of forest ecosystems, as well as grassland and riparian systems. We examine how factors such as natural and human disturbances, climate, succession, and soil fertility shape ecosystem biogeochemistry - and the reciprocal effect of biogeochemical cycles on these and other factors.
By
Ecosystems Mission Area, Land Management Research Program, Forest and Rangeland Ecosystem Science Center
Terrestrial Ecosystems Laboratory (FRESC)

Terrestrial Ecosystems Laboratory (FRESC)

Research in our laboratory centers on the ecology and biogeochemistry of forest ecosystems, as well as grassland and riparian systems. We examine how factors such as natural and human disturbances, climate, succession, and soil fertility shape ecosystem biogeochemistry - and the reciprocal effect of biogeochemical cycles on these and other factors.
Learn More

If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

No Result Found

If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

No results found.

If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

Filter Total Items: 80

Regional constraints to biological nitrogen fixation in post-fire forest communities Regional constraints to biological nitrogen fixation in post-fire forest communities

Biological nitrogen fixation (BNF) is a key ecological process that can restore nitrogen (N) lost in wildfire and shape the pace and pattern of post-fire forest recovery. To date, there is limited information on how climate and soil fertility interact to influence different pathways of BNF in early forest succession. We studied asymbiotic (forest floor and soil) and symbiotic (the shrub...
Authors
Stephanie Yelenik, Steven S. Perakis, David Hibbs
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Nitrate in watersheds: straight from soils to streams? Nitrate in watersheds: straight from soils to streams?

Human activities are rapidly increasing the global supply of reactive N and substantially altering the structure and hydrologic connectivity of managed ecosystems. There is long-standing recognition that N must be removed along hydrologic flowpaths from uplands to streams, yet it has proven difficult to assess the generality of this removal across ecosystem types, and whether these...
Authors
Elizabeth B. Sudduth, Steven S. Perakis, Emily S. Bernhardt
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Riparian litter inputs to streams in the central Oregon Coast Range Riparian litter inputs to streams in the central Oregon Coast Range

Riparian-zone vegetation can influence terrestrial and aquatic food webs through variation in the amount, timing, and nutritional content of leaf and other litter inputs. We investigated how riparian-forest community composition, understory density, and lateral slope shaped vertical and lateral litter inputs to 16 streams in the Oregon Coast Range. Riparian forests dominated by deciduous...
Authors
Stephanie K. Hart, David E. Hibbs, Steven S. Perakis
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Contribution of calcium oxalate to soil-exchangeable calcium Contribution of calcium oxalate to soil-exchangeable calcium

Acid deposition and repeated biomass harvest have decreased soil calcium (Ca) availability in many temperate forests worldwide, yet existing methods for assessing available soil Ca do not fully characterize soil Ca forms. To account for discrepancies in ecosystem Ca budgets, it has been hypothesized that the highly insoluble biomineral Ca oxalate might represent an additional soil Ca...
Authors
Jenny M. Dauer, Steven S. Perakis
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

N2-fixing red alder indirectly accelerates ecosystem nitrogen cycling N2-fixing red alder indirectly accelerates ecosystem nitrogen cycling

Symbiotic N2-fixing tree species can accelerate ecosystem N dynamics through decomposition via direct pathways by producing readily decomposed leaf litter and increasing N supply to decomposers, as well as via indirect pathways by increasing tissue and detrital N in non-fixing vegetation. To evaluate the relative importance of these pathways, we compared three-year decomposition and N...
Authors
Steven S. Perakis, Joselin J. Matkins, David E. Hibbs
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Nitrogen limitation, 15N tracer retention, and growth response in intact and Bromus tectorum-invaded Artemisia tridentata ssp. wyomingensis communities Nitrogen limitation, 15N tracer retention, and growth response in intact and Bromus tectorum-invaded Artemisia tridentata ssp. wyomingensis communities

Annual grass invasion into shrub-dominated ecosystems is associated with changes in nutrient cycling that may alter nitrogen (N) limitation and retention. Carbon (C) applications that reduce plant-available N have been suggested to give native perennial vegetation a competitive advantage over exotic annual grasses, but plant community and N retention responses to C addition remain poorly
Authors
Dana L. Witwicki, Paul S. Doescher, David A. Pyke, Nicole M. DeCrappeo, Steven S. Perakis
By
Ecosystems Mission Area, Forest and Rangeland Ecosystem Science Center

Non-USGS Publications**

Perakis, S.S., Hedin, L.O., 2002, Response to commentary on "Nitrogen loss from unpolluted South American forests mainly via dissolved organic compounds": Nature, v. 418, p. 665-665.
Perakis, S.S., Welch, E.B., Jacoby, J.M., 1996, Sediment-to-water blue-green algal recruitment in response to alum and environmental factors: Hydrobiologia, v. 318, no. 3, p. 165-177.

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

To request an interview, contact fresc_outreach@usgs.gov or call (541) 750-1030.

Filter Total Items: 14
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