Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 144
Modeling physical and biogeochemical controls over carbon accumulation in a boreal forest soil Modeling physical and biogeochemical controls over carbon accumulation in a boreal forest soil
Boreal soils are important to the global C cycle owing to large C stocks, repeated disturbance from fire, and the potential for permafrost thaw to expose previously stable, buried C. To evaluate the primary mechanisms responsible for both short- and long-term C accumulation in boreal soils, we developed a multi-isotope (12,14C) Soil C model with dynamic soil layers that develop through...
Authors
J.J. Carrasco, J. C. Neff, J.W. Harden
Wildfires threaten mercury stocks in northern soils Wildfires threaten mercury stocks in northern soils
With climate change rapidly affecting northern forests and wetlands, mercury reserves once protected in cold, wet soils are being exposed to burning, likely triggering large releases of mercury to the atmosphere. We quantify organic soil mercury stocks and burn areas across western, boreal Canada for use in fire emission models that explore controls of burn area, consumption severity...
Authors
M.R. Turetsky, J.W. Harden, H.R. Friedli, M. Flannigan, N. Payne, J. Crock, L. Radke
Geomorphic control of landscape carbon accumulation Geomorphic control of landscape carbon accumulation
We use the CREEP process-response model to simulate soil organic carbon accumulation in an undisturbed prairie site in Iowa. Our primary objectives are to identify spatial patterns of carbon accumulation, and explore the effect of erosion on basin-scale C accumulation. Our results point to two general findings. First, redistribution of soil carbon by erosion results in a net increase in...
Authors
N.A. Rosenbloom, J.W. Harden, J. C. Neff, D. S. Schimel
Stable carbon isotope depth profiles and soil organic carbon dynamics in the lower Mississippi Basin Stable carbon isotope depth profiles and soil organic carbon dynamics in the lower Mississippi Basin
Analysis of depth trends of 13C abundance in soil organic matter and of 13C abundance from soil-respired CO2 provides useful indications of the dynamics of the terrestrial carbon cycle and of paleoecological change. We measured depth trends of 13C abundance from cropland and control pairs of soils in the lower Mississippi Basin, as well as the 13C abundance of soil-respired CO2 produced...
Authors
J.G. Wynn, J.W. Harden, T. L. Fries
Comparing electronic probes for volumetric water content of low-density feathermoss Comparing electronic probes for volumetric water content of low-density feathermoss
Purpose - Feathermoss is ubiquitous in the boreal forest and across various land-cover types of the arctic and subarctic. A variety of affordable commercial sensors for soil moisture content measurement have recently become available and are in use in such regions, often in conjunction with fire-susceptibility or ecological studies. Few come supplied with calibrations suitable or...
Authors
P.P. Overduin, K. Yoshikawa, D.L. Kane, J.W. Harden
Woody debris along an upland chronosequence in boreal Manitoba and its impact on long-term carbon storage Woody debris along an upland chronosequence in boreal Manitoba and its impact on long-term carbon storage
This study investigated the role of fire-killed woody debris as a source of soil carbon in black spruce (Picea mariana (Mill.) BSP) stands in Manitoba, Canada. We measured the amount of standing dead and downed woody debris along an upland chronosequence, including wood partially and completely covered by moss growth. Such woody debris is rarely included in measurement protocols and...
Authors
K.L. Manies, J.W. Harden, B. P. Bond-Lamberty, K. P. O’Neill
Science and Products
Filter Total Items: 144
Modeling physical and biogeochemical controls over carbon accumulation in a boreal forest soil Modeling physical and biogeochemical controls over carbon accumulation in a boreal forest soil
Boreal soils are important to the global C cycle owing to large C stocks, repeated disturbance from fire, and the potential for permafrost thaw to expose previously stable, buried C. To evaluate the primary mechanisms responsible for both short- and long-term C accumulation in boreal soils, we developed a multi-isotope (12,14C) Soil C model with dynamic soil layers that develop through...
Authors
J.J. Carrasco, J. C. Neff, J.W. Harden
Wildfires threaten mercury stocks in northern soils Wildfires threaten mercury stocks in northern soils
With climate change rapidly affecting northern forests and wetlands, mercury reserves once protected in cold, wet soils are being exposed to burning, likely triggering large releases of mercury to the atmosphere. We quantify organic soil mercury stocks and burn areas across western, boreal Canada for use in fire emission models that explore controls of burn area, consumption severity...
Authors
M.R. Turetsky, J.W. Harden, H.R. Friedli, M. Flannigan, N. Payne, J. Crock, L. Radke
Geomorphic control of landscape carbon accumulation Geomorphic control of landscape carbon accumulation
We use the CREEP process-response model to simulate soil organic carbon accumulation in an undisturbed prairie site in Iowa. Our primary objectives are to identify spatial patterns of carbon accumulation, and explore the effect of erosion on basin-scale C accumulation. Our results point to two general findings. First, redistribution of soil carbon by erosion results in a net increase in...
Authors
N.A. Rosenbloom, J.W. Harden, J. C. Neff, D. S. Schimel
Stable carbon isotope depth profiles and soil organic carbon dynamics in the lower Mississippi Basin Stable carbon isotope depth profiles and soil organic carbon dynamics in the lower Mississippi Basin
Analysis of depth trends of 13C abundance in soil organic matter and of 13C abundance from soil-respired CO2 provides useful indications of the dynamics of the terrestrial carbon cycle and of paleoecological change. We measured depth trends of 13C abundance from cropland and control pairs of soils in the lower Mississippi Basin, as well as the 13C abundance of soil-respired CO2 produced...
Authors
J.G. Wynn, J.W. Harden, T. L. Fries
Comparing electronic probes for volumetric water content of low-density feathermoss Comparing electronic probes for volumetric water content of low-density feathermoss
Purpose - Feathermoss is ubiquitous in the boreal forest and across various land-cover types of the arctic and subarctic. A variety of affordable commercial sensors for soil moisture content measurement have recently become available and are in use in such regions, often in conjunction with fire-susceptibility or ecological studies. Few come supplied with calibrations suitable or...
Authors
P.P. Overduin, K. Yoshikawa, D.L. Kane, J.W. Harden
Woody debris along an upland chronosequence in boreal Manitoba and its impact on long-term carbon storage Woody debris along an upland chronosequence in boreal Manitoba and its impact on long-term carbon storage
This study investigated the role of fire-killed woody debris as a source of soil carbon in black spruce (Picea mariana (Mill.) BSP) stands in Manitoba, Canada. We measured the amount of standing dead and downed woody debris along an upland chronosequence, including wood partially and completely covered by moss growth. Such woody debris is rarely included in measurement protocols and...
Authors
K.L. Manies, J.W. Harden, B. P. Bond-Lamberty, K. P. O’Neill
*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