Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 134
Carbon cycling in terrestrial environments: Chapter 17
This chapter reviews a number of applications of isotopic techniques for the investigation of carbon cycling processes. Carbon dioxide (C02) is an important greenhouse gas. Its concentration in the atmosphere has increased from an estimated 270 ppm at the beginning of the industrial revolution to ∼ 360 ppm at present. Climatic conditions and atmospheric C02 concentration also influence isotopic di
Authors
Yang Wang, Thomas G. Huntington, Laurie J. Osher, Leonard I Wassenaar, Susan E. Trumbore, Ronald Amundson, Jennifer W. Harden, Diane M. McKnight, Sherry L. Schiff, George R. Aiken, W. Berry Lyons, Ramon O. Aravena, Jill Baron
Moss and soil contributions to the annual net carbon flux of a maturing boreal forest
We used input and decomposition data from 14C studies of soils to determine rates of vertical accumulation of moss combined with carbon storage inventories on a sequence of burns to model how carbon accumulates in soils and moss after a stand-killing fire. We used soil drainage—moss associations and soil drainage maps of the old black spruce (OBS) site at the BOREAS northern study area (NSA) to ar
Authors
J. W. Harden, K. P. O'Neill, S.E. Trumbore, H. Veldhuis, B.J. Stocks
Accumulation and turnover of carbon in organic and mineral soils of the BOREAS northern study area
Rates of input, accumulation, and turnover of C differ markedly within soil profiles and in soils with different drainage in the BOREAS northern study area. Soil C storage increases from ∼3 kg C m−2 in well-drained, sandy soils to greater than 100 kg C m−2 in wetlands. Two modes of C accumulation were observed in upland soil profiles. Large annual C inputs (0.06–0.1 kg C m−2 yr−1) and slow decompo
Authors
S.E. Trumbore, J. W. Harden
Chemical weathering rates of a soil chronosequence on granitic alluvium: I. Quantification of mineralogical and surface area changes and calculation of primary silicate reaction rates
Mineral weathering rates are determined for a series of soils ranging in age from 0.2-3000 Ky developed on alluvial terraces near Merced in the Central Valley of California. Mineralogical and elemental abundances exhibit time-dependent trends documenting the chemical evolution of granitic sand to residual kaolinite and quartz. Mineral losses with time occur in the order: hornblende > plagioclase >
Authors
A. F. White, A.E. Blum, M. S. Schulz, T.D. Bullen, J. W. Harden, M. L. Peterson
Effect of timber harvest on soil carbon storage at Blodgett Experimental Forest, California
Four plots from a mixed conifer forest were similarly cleared, burned, and replanted at various times over 17 years; a plot logged 79 years before sampling was used as a control. The plots had similar slope (2 to 15%, midslope position), aspect (south to southeast), and soil type (Holland series: mesic Haploxeralf; a Gray Brown Luvisol in the Canadian classification system). Twenty sites at each p
Authors
T.A. Black, J. W. Harden
Boreal Ecosystem-Atmosphere Study (BOREAS) 1993 laboratory data and notes, Thompson, Manitoba
No abstract available.
Authors
K. P. O'Neill, J. W. Harden, S.E. Trumbore
Boreal Ecosystem-Atmosphere Study (BOREAS) 1993 field notes, Thompson, Manitoba
No abstract available.
Authors
K. P. O'Neill, J. W. Harden, S.E. Trumbore, M.O. Bentley, Gregg Winston, B.B. Stephens, T.A. Black
Isotopic Approach to Soil Carbonate Dynamics and Implications for Paleoclimatic Interpretations
The radiocarbon content and stable isotope composition of soil carbonate are best described by a dynamic system in which isotopic reequilibration occurs as a result of recurrent dissolution and reprecipitation. Depth of water penetration into the soil profile, as well as soil age, determines the degree of carbonate isotope reequilibration. We measured ??13C, ??18O and radiocarbon content of gravel
Authors
E. G. Pendall, J. W. Harden, S.E. Trumbore, O.A. Chadwick
Soil carbon and nitrogen data set for a soil sequence disturbed by timber harvest, Blodgett Experimental Forest, Georgetown, California
No abstract available.
Authors
T.A. Black, J. W. Harden
Morphology and genesis of carbonate soils on the Kyle Canyon fan, Nevada, U.S.A.
The physical and chemical properties of soils formed in an arid climate on calcareous alluvium of the Kyle Canyon alluvial fan, southern Nevada, were studied in order to infer the rates and relative importance of various soil-forming processes. These studies included field and microscopic observations and analyses of thin sections, major oxides, extractable iron, and clay minerals. The results are
Authors
M. C. Reheis, J.M. Sowers, E. M. Taylor, L. D. McFadden, J. W. Harden
Dynamics of soil carbon during deglaciation of the laurentide ice sheet
Deglaciation of the Laurentide Ice Sheet in North America was accompanied by sequestration of organic carbon in newly exposed soils. The greatest rate of land exposure occurred around 12,000 to 8,000 years ago, and the greatest increase in the rate of carbon sequestration by soils occurred from 8,000 to 4,000 years ago. Sequestration of carbon in deglaciated peat lands continues today, and a stead
Authors
J. W. Harden, E.T. Sundquist, R.F. Stallard, R. K. Mark
Seasonal variations of carbon dioxide concentrations in stony, coarse-textured desert soils of southern Nevada, USA
Knowledge of carbon dioxide concentration in desert soils is required in theoretical models of the development of pedogenic and ground-water calcium carbonate. Most studies have concentrated on medium- to fine-textured soils in temperate to humid environments. Very little data exist for CO2 concentrations in stony, coarse-textured deposits such as those making up alluvial fans and fluvial terraces
Authors
Christina L. Terhune, Jennifer W. Harden
Science and Products
Filter Total Items: 134
Carbon cycling in terrestrial environments: Chapter 17
This chapter reviews a number of applications of isotopic techniques for the investigation of carbon cycling processes. Carbon dioxide (C02) is an important greenhouse gas. Its concentration in the atmosphere has increased from an estimated 270 ppm at the beginning of the industrial revolution to ∼ 360 ppm at present. Climatic conditions and atmospheric C02 concentration also influence isotopic di
Authors
Yang Wang, Thomas G. Huntington, Laurie J. Osher, Leonard I Wassenaar, Susan E. Trumbore, Ronald Amundson, Jennifer W. Harden, Diane M. McKnight, Sherry L. Schiff, George R. Aiken, W. Berry Lyons, Ramon O. Aravena, Jill Baron
Moss and soil contributions to the annual net carbon flux of a maturing boreal forest
We used input and decomposition data from 14C studies of soils to determine rates of vertical accumulation of moss combined with carbon storage inventories on a sequence of burns to model how carbon accumulates in soils and moss after a stand-killing fire. We used soil drainage—moss associations and soil drainage maps of the old black spruce (OBS) site at the BOREAS northern study area (NSA) to ar
Authors
J. W. Harden, K. P. O'Neill, S.E. Trumbore, H. Veldhuis, B.J. Stocks
Accumulation and turnover of carbon in organic and mineral soils of the BOREAS northern study area
Rates of input, accumulation, and turnover of C differ markedly within soil profiles and in soils with different drainage in the BOREAS northern study area. Soil C storage increases from ∼3 kg C m−2 in well-drained, sandy soils to greater than 100 kg C m−2 in wetlands. Two modes of C accumulation were observed in upland soil profiles. Large annual C inputs (0.06–0.1 kg C m−2 yr−1) and slow decompo
Authors
S.E. Trumbore, J. W. Harden
Chemical weathering rates of a soil chronosequence on granitic alluvium: I. Quantification of mineralogical and surface area changes and calculation of primary silicate reaction rates
Mineral weathering rates are determined for a series of soils ranging in age from 0.2-3000 Ky developed on alluvial terraces near Merced in the Central Valley of California. Mineralogical and elemental abundances exhibit time-dependent trends documenting the chemical evolution of granitic sand to residual kaolinite and quartz. Mineral losses with time occur in the order: hornblende > plagioclase >
Authors
A. F. White, A.E. Blum, M. S. Schulz, T.D. Bullen, J. W. Harden, M. L. Peterson
Effect of timber harvest on soil carbon storage at Blodgett Experimental Forest, California
Four plots from a mixed conifer forest were similarly cleared, burned, and replanted at various times over 17 years; a plot logged 79 years before sampling was used as a control. The plots had similar slope (2 to 15%, midslope position), aspect (south to southeast), and soil type (Holland series: mesic Haploxeralf; a Gray Brown Luvisol in the Canadian classification system). Twenty sites at each p
Authors
T.A. Black, J. W. Harden
Boreal Ecosystem-Atmosphere Study (BOREAS) 1993 laboratory data and notes, Thompson, Manitoba
No abstract available.
Authors
K. P. O'Neill, J. W. Harden, S.E. Trumbore
Boreal Ecosystem-Atmosphere Study (BOREAS) 1993 field notes, Thompson, Manitoba
No abstract available.
Authors
K. P. O'Neill, J. W. Harden, S.E. Trumbore, M.O. Bentley, Gregg Winston, B.B. Stephens, T.A. Black
Isotopic Approach to Soil Carbonate Dynamics and Implications for Paleoclimatic Interpretations
The radiocarbon content and stable isotope composition of soil carbonate are best described by a dynamic system in which isotopic reequilibration occurs as a result of recurrent dissolution and reprecipitation. Depth of water penetration into the soil profile, as well as soil age, determines the degree of carbonate isotope reequilibration. We measured ??13C, ??18O and radiocarbon content of gravel
Authors
E. G. Pendall, J. W. Harden, S.E. Trumbore, O.A. Chadwick
Soil carbon and nitrogen data set for a soil sequence disturbed by timber harvest, Blodgett Experimental Forest, Georgetown, California
No abstract available.
Authors
T.A. Black, J. W. Harden
Morphology and genesis of carbonate soils on the Kyle Canyon fan, Nevada, U.S.A.
The physical and chemical properties of soils formed in an arid climate on calcareous alluvium of the Kyle Canyon alluvial fan, southern Nevada, were studied in order to infer the rates and relative importance of various soil-forming processes. These studies included field and microscopic observations and analyses of thin sections, major oxides, extractable iron, and clay minerals. The results are
Authors
M. C. Reheis, J.M. Sowers, E. M. Taylor, L. D. McFadden, J. W. Harden
Dynamics of soil carbon during deglaciation of the laurentide ice sheet
Deglaciation of the Laurentide Ice Sheet in North America was accompanied by sequestration of organic carbon in newly exposed soils. The greatest rate of land exposure occurred around 12,000 to 8,000 years ago, and the greatest increase in the rate of carbon sequestration by soils occurred from 8,000 to 4,000 years ago. Sequestration of carbon in deglaciated peat lands continues today, and a stead
Authors
J. W. Harden, E.T. Sundquist, R.F. Stallard, R. K. Mark
Seasonal variations of carbon dioxide concentrations in stony, coarse-textured desert soils of southern Nevada, USA
Knowledge of carbon dioxide concentration in desert soils is required in theoretical models of the development of pedogenic and ground-water calcium carbonate. Most studies have concentrated on medium- to fine-textured soils in temperate to humid environments. Very little data exist for CO2 concentrations in stony, coarse-textured deposits such as those making up alluvial fans and fluvial terraces
Authors
Christina L. Terhune, Jennifer W. Harden
*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