Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 144
Chemical weathering rates of a soil chronosequence on granitic alluvium: III. Hydrochemical evolution and contemporary solute fluxes and rates Chemical weathering rates of a soil chronosequence on granitic alluvium: III. Hydrochemical evolution and contemporary solute fluxes and rates
Although long-term changes in solid-state compositions of soil chronosequences have been extensively investigated, this study presents the first detailed description of the concurrent hydrochemical evolution and contemporary weathering rates in such sequences. The most direct linkage between weathering and hydrology over 3 million years of soil development in the Merced chronosequence in...
Authors
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom, J.W. Harden
Fire effects on soil organic matter content, composition, and nutrients in boreal interior Alaska Fire effects on soil organic matter content, composition, and nutrients in boreal interior Alaska
Boreal ecosystems contain a substantial fraction of the earth's soil carbon stores and are prone to frequent and severe wildfires. In this study, we examine changes in element and organic matter stocks due to a 1999 wildfire in Alaska. One year after the wildfire, burned soils contained between 1071 and 1420 g/m2 less carbon than unburned soils. Burned soils had lower nitrogen than...
Authors
J. C. Neff, J.W. Harden, G. Gleixner
Soil data from Picea mariana stands near delta junction, Alaska of different ages and soil drainage type 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...
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 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...
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 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...
Authors
K. Yoshikawa, P.P. Overduin, J.W. Harden
Chemistry of burning the forest floor during the FROSTFIRE experimental burn, interior Alaska, 1999 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
Authors
J.W. Harden, J. C. Neff, D. V. Sandberg, M.R. Turetsky, R. Ottmar, G. Gleixner, T. L. Fries, K.L. Manies
Science and Products
Filter Total Items: 144
Chemical weathering rates of a soil chronosequence on granitic alluvium: III. Hydrochemical evolution and contemporary solute fluxes and rates Chemical weathering rates of a soil chronosequence on granitic alluvium: III. Hydrochemical evolution and contemporary solute fluxes and rates
Although long-term changes in solid-state compositions of soil chronosequences have been extensively investigated, this study presents the first detailed description of the concurrent hydrochemical evolution and contemporary weathering rates in such sequences. The most direct linkage between weathering and hydrology over 3 million years of soil development in the Merced chronosequence in...
Authors
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom, J.W. Harden
Fire effects on soil organic matter content, composition, and nutrients in boreal interior Alaska Fire effects on soil organic matter content, composition, and nutrients in boreal interior Alaska
Boreal ecosystems contain a substantial fraction of the earth's soil carbon stores and are prone to frequent and severe wildfires. In this study, we examine changes in element and organic matter stocks due to a 1999 wildfire in Alaska. One year after the wildfire, burned soils contained between 1071 and 1420 g/m2 less carbon than unburned soils. Burned soils had lower nitrogen than...
Authors
J. C. Neff, J.W. Harden, G. Gleixner
Soil data from Picea mariana stands near delta junction, Alaska of different ages and soil drainage type 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...
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 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...
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 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...
Authors
K. Yoshikawa, P.P. Overduin, J.W. Harden
Chemistry of burning the forest floor during the FROSTFIRE experimental burn, interior Alaska, 1999 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
Authors
J.W. Harden, J. C. Neff, D. V. Sandberg, M.R. Turetsky, R. Ottmar, G. Gleixner, T. L. Fries, K.L. Manies
*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