Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 144
Accumulation and turnover of carbon in organic and mineral soils of the BOREAS northern study area 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...
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 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 >...
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 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...
Authors
T.A. Black, J.W. Harden
Boreal Ecosystem-Atmosphere Study (BOREAS) 1993 laboratory data and notes, Thompson, Manitoba 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 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
Soil carbon and nitrogen data set for a soil sequence disturbed by timber harvest, Blodgett Experimental Forest, Georgetown, California 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
Isotopic Approach to Soil Carbonate Dynamics and Implications for Paleoclimatic Interpretations 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...
Authors
E. G. Pendall, J.W. Harden, S.E. Trumbore, O.A. Chadwick
Morphology and genesis of carbonate soils on the Kyle Canyon fan, Nevada, U.S.A. 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...
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 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...
Authors
Jennifer W. Harden, R. K. Mark, E.T. Sundquist, R.F. Stallard
Seasonal variations of carbon dioxide concentrations in stony, coarse-textured desert soils of southern Nevada, USA 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...
Authors
Christina L. Terhune, Jennifer W. Harden
Calcic, gypsic, and siliceous soil chronosequences in arid and semiarid environments Calcic, gypsic, and siliceous soil chronosequences in arid and semiarid environments
We studied three soil chronosequences in the western USA to compare the development of calcic, gypsic, and siliceous soils through time. We compared calcic soils from the Silver Lake playa, southeastern California, gypsic-calcic soils from the Kane Fans in Big Horn County, Wyoming, and siliceous-calcic soils from Forty-mile Wash in southwestern Nevada. In these areas, carbonate, gypsum...
Authors
J.W. Harden, E. M. Taylor, M.C. Reheis, L. D. McFadden
Rates of soil development from four soil chronosequences in the southern Great Basin Rates of soil development from four soil chronosequences in the southern Great Basin
Four soil chronosequences in the southern Great Basin were examined in order to study and quantify soil development during the Quaternary. Soils of all four areas are developed in gravelly alluvial fans in semiarid climates with 8 to 40 cm mean annual precipitation. Lithologies of alluvium are granite-gneiss at Silver Lake, granite and basalt at Cima Volcanic Field, limestone at Kyle...
Authors
J.W. Harden, E. M. Taylor, C. Hill, R. K. Mark, L. D. McFadden, M.C. Reheis, J.M. Sowers, S. G. Wells
Science and Products
Filter Total Items: 144
Accumulation and turnover of carbon in organic and mineral soils of the BOREAS northern study area 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...
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 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 >...
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 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...
Authors
T.A. Black, J.W. Harden
Boreal Ecosystem-Atmosphere Study (BOREAS) 1993 laboratory data and notes, Thompson, Manitoba 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 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
Soil carbon and nitrogen data set for a soil sequence disturbed by timber harvest, Blodgett Experimental Forest, Georgetown, California 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
Isotopic Approach to Soil Carbonate Dynamics and Implications for Paleoclimatic Interpretations 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...
Authors
E. G. Pendall, J.W. Harden, S.E. Trumbore, O.A. Chadwick
Morphology and genesis of carbonate soils on the Kyle Canyon fan, Nevada, U.S.A. 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...
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 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...
Authors
Jennifer W. Harden, R. K. Mark, E.T. Sundquist, R.F. Stallard
Seasonal variations of carbon dioxide concentrations in stony, coarse-textured desert soils of southern Nevada, USA 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...
Authors
Christina L. Terhune, Jennifer W. Harden
Calcic, gypsic, and siliceous soil chronosequences in arid and semiarid environments Calcic, gypsic, and siliceous soil chronosequences in arid and semiarid environments
We studied three soil chronosequences in the western USA to compare the development of calcic, gypsic, and siliceous soils through time. We compared calcic soils from the Silver Lake playa, southeastern California, gypsic-calcic soils from the Kane Fans in Big Horn County, Wyoming, and siliceous-calcic soils from Forty-mile Wash in southwestern Nevada. In these areas, carbonate, gypsum...
Authors
J.W. Harden, E. M. Taylor, M.C. Reheis, L. D. McFadden
Rates of soil development from four soil chronosequences in the southern Great Basin Rates of soil development from four soil chronosequences in the southern Great Basin
Four soil chronosequences in the southern Great Basin were examined in order to study and quantify soil development during the Quaternary. Soils of all four areas are developed in gravelly alluvial fans in semiarid climates with 8 to 40 cm mean annual precipitation. Lithologies of alluvium are granite-gneiss at Silver Lake, granite and basalt at Cima Volcanic Field, limestone at Kyle...
Authors
J.W. Harden, E. M. Taylor, C. Hill, R. K. Mark, L. D. McFadden, M.C. Reheis, J.M. Sowers, S. G. Wells
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