Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 134
Soil data from Picea mariana stands near delta junction, Alaska of different ages and soil drainage type
The U.S. Geological Survey project Fate of Carbon in Alaskan Landscapes (FOCAL) is studying the effect of fire and soil drainage on soil carbon storage in the boreal forest. This project has selected several sites to study within central Alaska of varying ages (time since fire) and soil drainage types. This report describes the location of these sampling sites, as well as the procedures used to de
Authors
Kristen L. Manies, Jennifer W. Harden, Steven R. Silva, Paul H. Briggs, Brian M. Schmid
Weathering controls on mechanisms of carbon storage in grassland soils
On a sequence of soils developed under similar vegetation, temperature, and precipitation conditions, but with variations in mineralogical properties, we use organic carbon and 14C inventories to examine mineral protection of soil organic carbon. In these soils, 14C data indicate that the creation of slow-cycling carbon can be modeled as occurring through reaction of organic ligands with Al3+ and
Authors
C.A. Masiello, O.A. Chadwick, J. Southon, M.S. Torn, J. W. Harden
Moisture content measurements of moss (Sphagnum spp.) using commercial sensors
Sphagnum (spp.) is widely distributed in permafrost regions around the arctic and subarctic. The moisture content of the moss layer affects the thermal insulative capacity and preservation of permafrost. It also controls the growth and collapse history of palsas and other peat mounds, and is relevant, in general terms, to permafrost thaw (thermokarst). In this study, we test and calibrate seven di
Authors
K. Yoshikawa, P.P. Overduin, J. W. Harden
Chemistry of burning the forest floor during the FROSTFIRE experimental burn, interior Alaska, 1999
Wildfires represent one of the most common disturbances in boreal regions, and have the potential to reduce C, N, and Hg stocks in soils while contributing to atmospheric emissions. Organic soil layers of the forest floor were sampled before and after the FROSTFIRE experimental burn in interior Alaska, and were analyzed for bulk density, major and trace elements, and organic compounds. Concentrati
Authors
J. W. Harden, J. C. Neff, D. V. Sandberg, M.R. Turetsky, R. Ottmar, G. Gleixner, T. L. Fries, K.L. Manies
Acidification of forest soil in Russia: From 1893 to present
It is commonly believed that fine-textured soils developed on carbonate parent material are well buffered from possible acidification. There are no data, however, that document resistance of such soils to acidic deposition exposure on a timescale longer than 30-40 years. In this paper, we report on directly testing the long-term buffering capacity of nineteenth century forest soils developed on ca
Authors
A.G. Lapenis, G. B. Lawrence, A.A. Andreev, A.A. Bobrov, M.S. Torn, J. W. Harden
Modeling soil thermal and carbon dynamics of a fire chronosequence in interior Alaska
In this study, the dynamics of soil thermal, hydrologic, and ecosystem processes were coupled to project how the carbon budgets of boreal forests will respond to changes in atmospheric CO2, climate, and fire disturbance. The ability of the model to simulate gross primary production and ecosystem respiration was verified for a mature black spruce ecosystem in Canada, the age-dependent pattern of th
Authors
Q. Zhuang, A. D. McGuire, K. P. O'Neill, J. W. Harden, V.E. Romanovsky, J. Yarie
Isotopic composition of carbon dioxide from a boreal forest fire: Inferring carbon loss from measurements and modeling
Fire is an important pathway for carbon (C) loss from boreal forest ecosystems and has a strong effect on ecosystem C balance. Fires can range widely in severity, defined as the amount of vegetation and forest floor consumed by fire, depending on local fuel and climatic conditions. Here we explore a novel method for estimating fire severity and loss of C from fire using the atmosphere to integrat
Authors
E.A.G. Schuur, S.E. Trumbore, M.C. Mack, J. W. Harden
Fire dynamics and implications for nitrogen cycling in boreal forests
We used a dynamic, long-term mass balance approach to track cumulative carbon (C) and nitrogen (N) losses to fire in boreal Manitoba over the 6500 years since deglaciation. Estimated C losses to decomposition and fire, combined with measurements of N pools in mature and burned forest floors, suggest that loss of N by combustion has likely resulted in a long-term loss that exceeds the amount of N s
Authors
J. W. Harden, M. Mack, H. Veldhuis, S.T. Gower
Physical data of soil profiles formed on late Quaternary marine terraces near Santa Cruz, California
The marine terraces in and around Santa Cruz, California, represent a set of well-preserved terraces formed as a product of geology, sea level, and climate. A marine terrace begins as a wave cut platform. Eustatic sea level changes, seacliff erosion, and tectonic uplift work together to generate marine terraces. "When a wave-cut platform is raised (due to tectonic activity) above sea level and cli
Authors
Jennie Munster, Jennifer W. Harden
Cycling of beryllium and carbon through hillslope soils in Iowa
Isotopes of Be and C were used to reconstruct loess accumulation, hillslope evolution, and agricultural modification in soils of western Iowa. While both elements are derived from additions by the atmosphere (via plants in the case of carbon), the differences in element cycling allow erosional and depositional processes to be separated from biochemical processing. Based on 10Be, loess accumulation
Authors
J. W. Harden, T. L. Fries, M.J. Pavich
A multiisotope C and N modeling analysis of soil organic matter turnover and transport as a function of soil depth in a California annual grassland soil chronosequence
We examine soil organic matter (SOM) turnover and transport using C and N isotopes in soil profiles sampled circa 1949, 1978, and 1998 (a period spanning pulse thermonuclear 14C enrichment of the atmosphere) along a 3‐million‐year annual grassland soil chronosequence. Temporal differences in soil Δ14C profiles indicate that inputs of recently living organic matter (OM) occur primarily in the upper
Authors
W.T. Baisden, Ronald Amundson, D.L. Brenner, A.C. Cook, C. Kendall, J. W. Harden
Net ecosystem production: A comprehensive measure of net carbon accumulation by ecosystems
The conceptual framework used by ecologists and biogeochemists must allow for accurate and clearly defined comparisons of carbon fluxes made with disparate techniques across a spectrum of temporal and spatial scales. Consistent with usage over the past four decades, we define "net ecosystem production" (NEP) as the net carbon accumulation by ecosystems. Past use of this term has been ambiguous, be
Authors
J. T. Randerson, F. S. Chapin, J. W. Harden, J. C. Neff, M. E. Harmon
Science and Products
Filter Total Items: 134
Soil data from Picea mariana stands near delta junction, Alaska of different ages and soil drainage type
The U.S. Geological Survey project Fate of Carbon in Alaskan Landscapes (FOCAL) is studying the effect of fire and soil drainage on soil carbon storage in the boreal forest. This project has selected several sites to study within central Alaska of varying ages (time since fire) and soil drainage types. This report describes the location of these sampling sites, as well as the procedures used to de
Authors
Kristen L. Manies, Jennifer W. Harden, Steven R. Silva, Paul H. Briggs, Brian M. Schmid
Weathering controls on mechanisms of carbon storage in grassland soils
On a sequence of soils developed under similar vegetation, temperature, and precipitation conditions, but with variations in mineralogical properties, we use organic carbon and 14C inventories to examine mineral protection of soil organic carbon. In these soils, 14C data indicate that the creation of slow-cycling carbon can be modeled as occurring through reaction of organic ligands with Al3+ and
Authors
C.A. Masiello, O.A. Chadwick, J. Southon, M.S. Torn, J. W. Harden
Moisture content measurements of moss (Sphagnum spp.) using commercial sensors
Sphagnum (spp.) is widely distributed in permafrost regions around the arctic and subarctic. The moisture content of the moss layer affects the thermal insulative capacity and preservation of permafrost. It also controls the growth and collapse history of palsas and other peat mounds, and is relevant, in general terms, to permafrost thaw (thermokarst). In this study, we test and calibrate seven di
Authors
K. Yoshikawa, P.P. Overduin, J. W. Harden
Chemistry of burning the forest floor during the FROSTFIRE experimental burn, interior Alaska, 1999
Wildfires represent one of the most common disturbances in boreal regions, and have the potential to reduce C, N, and Hg stocks in soils while contributing to atmospheric emissions. Organic soil layers of the forest floor were sampled before and after the FROSTFIRE experimental burn in interior Alaska, and were analyzed for bulk density, major and trace elements, and organic compounds. Concentrati
Authors
J. W. Harden, J. C. Neff, D. V. Sandberg, M.R. Turetsky, R. Ottmar, G. Gleixner, T. L. Fries, K.L. Manies
Acidification of forest soil in Russia: From 1893 to present
It is commonly believed that fine-textured soils developed on carbonate parent material are well buffered from possible acidification. There are no data, however, that document resistance of such soils to acidic deposition exposure on a timescale longer than 30-40 years. In this paper, we report on directly testing the long-term buffering capacity of nineteenth century forest soils developed on ca
Authors
A.G. Lapenis, G. B. Lawrence, A.A. Andreev, A.A. Bobrov, M.S. Torn, J. W. Harden
Modeling soil thermal and carbon dynamics of a fire chronosequence in interior Alaska
In this study, the dynamics of soil thermal, hydrologic, and ecosystem processes were coupled to project how the carbon budgets of boreal forests will respond to changes in atmospheric CO2, climate, and fire disturbance. The ability of the model to simulate gross primary production and ecosystem respiration was verified for a mature black spruce ecosystem in Canada, the age-dependent pattern of th
Authors
Q. Zhuang, A. D. McGuire, K. P. O'Neill, J. W. Harden, V.E. Romanovsky, J. Yarie
Isotopic composition of carbon dioxide from a boreal forest fire: Inferring carbon loss from measurements and modeling
Fire is an important pathway for carbon (C) loss from boreal forest ecosystems and has a strong effect on ecosystem C balance. Fires can range widely in severity, defined as the amount of vegetation and forest floor consumed by fire, depending on local fuel and climatic conditions. Here we explore a novel method for estimating fire severity and loss of C from fire using the atmosphere to integrat
Authors
E.A.G. Schuur, S.E. Trumbore, M.C. Mack, J. W. Harden
Fire dynamics and implications for nitrogen cycling in boreal forests
We used a dynamic, long-term mass balance approach to track cumulative carbon (C) and nitrogen (N) losses to fire in boreal Manitoba over the 6500 years since deglaciation. Estimated C losses to decomposition and fire, combined with measurements of N pools in mature and burned forest floors, suggest that loss of N by combustion has likely resulted in a long-term loss that exceeds the amount of N s
Authors
J. W. Harden, M. Mack, H. Veldhuis, S.T. Gower
Physical data of soil profiles formed on late Quaternary marine terraces near Santa Cruz, California
The marine terraces in and around Santa Cruz, California, represent a set of well-preserved terraces formed as a product of geology, sea level, and climate. A marine terrace begins as a wave cut platform. Eustatic sea level changes, seacliff erosion, and tectonic uplift work together to generate marine terraces. "When a wave-cut platform is raised (due to tectonic activity) above sea level and cli
Authors
Jennie Munster, Jennifer W. Harden
Cycling of beryllium and carbon through hillslope soils in Iowa
Isotopes of Be and C were used to reconstruct loess accumulation, hillslope evolution, and agricultural modification in soils of western Iowa. While both elements are derived from additions by the atmosphere (via plants in the case of carbon), the differences in element cycling allow erosional and depositional processes to be separated from biochemical processing. Based on 10Be, loess accumulation
Authors
J. W. Harden, T. L. Fries, M.J. Pavich
A multiisotope C and N modeling analysis of soil organic matter turnover and transport as a function of soil depth in a California annual grassland soil chronosequence
We examine soil organic matter (SOM) turnover and transport using C and N isotopes in soil profiles sampled circa 1949, 1978, and 1998 (a period spanning pulse thermonuclear 14C enrichment of the atmosphere) along a 3‐million‐year annual grassland soil chronosequence. Temporal differences in soil Δ14C profiles indicate that inputs of recently living organic matter (OM) occur primarily in the upper
Authors
W.T. Baisden, Ronald Amundson, D.L. Brenner, A.C. Cook, C. Kendall, J. W. Harden
Net ecosystem production: A comprehensive measure of net carbon accumulation by ecosystems
The conceptual framework used by ecologists and biogeochemists must allow for accurate and clearly defined comparisons of carbon fluxes made with disparate techniques across a spectrum of temporal and spatial scales. Consistent with usage over the past four decades, we define "net ecosystem production" (NEP) as the net carbon accumulation by ecosystems. Past use of this term has been ambiguous, be
Authors
J. T. Randerson, F. S. Chapin, J. W. Harden, J. C. Neff, M. E. Harmon
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government