Soil organic carbon in a mountainous, forested region: relation to site characteristics
Soil organic C content (SOC, kilograms C per square meter) and its relation to site characteristics are important in evaluating current regional, continental, and global soil C stores and projecting future changes. Data were compiled for 499 pedons in the largely forested, mountainous western Oregon...
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| Published in: | Soil Science Society of America journal Vol. 59; no. 5; pp. 1468 - 1475 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
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Madison, WI
Soil Science Society of America
01-09-1995
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| Abstract | Soil organic C content (SOC, kilograms C per square meter) and its relation to site characteristics are important in evaluating current regional, continental, and global soil C stores and projecting future changes. Data were compiled for 499 pedons in the largely forested, mountainous western Oregon region. The SOC of mineral soil ranged from 0.9 to 24 kg C m-2 (mean = 6.5) for 0- to 20-cm depth and 2.3 to 88 kg C m-2 (mean = 15.8) for 0- to 100-cm depth. Variability in each of the three terms that determine SOC-C concentration, bulk density, and rock volume-contributed substantially to SOC variation. Regression analysis of 134 forest pedons indicated that combinations of site characteristics explained up to 50% of the SOC variability. The SOC increased with annual temperature, annual precipitation, actual evapotranspiration, clay, and available water-holding capacity and decreased with slope. Relations for western Oregon differed qualitatively and quantitatively from those for other regions and contrasted with the decrease in SOC associated with increased temperature in Great Plains grasslands. Of the variability not explained by regression analysis, one-half may be due to the combined uncertainty associated with measurements of C concentrations, bulk density, and rock volume; natural within-site variability; and site-characteristic measurements. Other unexplained variability is probably due to potentially important but poorly documented site characteristics, such as recent vegetation composition, geomorphic disturbance regime, and fire history |
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| AbstractList | Soil organic C content (SOC, kilograms C per square meter) and its relation to site characteristics are important in evaluating current regional, continental, and global soil C stores and projecting future changes. Data were compiled for 499 pedons in the largely forested, mountainous western Oregon region. The SOC of mineral soil ranged from 0.9 to 24 kg C m−2 (mean = 6.5) for 0‐ to 20‐cm depth and 2.3 to 88 kg C m−2 (mean = 15.8) for 0‐ to 100‐cm depth. Variability in each of the three terms that determine SOC − C concentration, bulk density, and rock volume ‐ contributed substantially to SOC variation. Regression analysis of 134 forest pedons indicated that combinations of site characteristics explained up to 50% of the SOC variability. The SOC increased with annual temperature, annual precipitation, actual evapotranspiration, clay, and available water‐holding capacity and decreased with slope. Relations for western Oregon differed qualitatively and quantitatively from those for other regions and contrasted with the decrease in SOC associated with increased temperature in Great Plains grasslands. Of the variability not explained by regression analysis, one‐half may be due to the combined uncertainty associated with measurements of C concentrations, bulk density, and rock volume; natural within‐site variability; and site‐characteristic measurements. Other unexplained variability is probably due to potentially important but poorly documented site characteristics, such as recent vegetation composition, geomorphic disturbance regime, and fire history. Soil organic C content (SOC, kilograms C per square meter) and its relation to site characteristics are important in evaluating current regional, continental, and global soil C stores and projecting future changes. Data were compiled for 499 pedons in the largely forested, mountainous western Oregon region. The SOC of mineral soil ranged from 0.9 to 24 kg C m −2 (mean = 6.5) for 0‐ to 20‐cm depth and 2.3 to 88 kg C m −2 (mean = 15.8) for 0‐ to 100‐cm depth. Variability in each of the three terms that determine SOC − C concentration, bulk density, and rock volume ‐ contributed substantially to SOC variation. Regression analysis of 134 forest pedons indicated that combinations of site characteristics explained up to 50% of the SOC variability. The SOC increased with annual temperature, annual precipitation, actual evapotranspiration, clay, and available water‐holding capacity and decreased with slope. Relations for western Oregon differed qualitatively and quantitatively from those for other regions and contrasted with the decrease in SOC associated with increased temperature in Great Plains grasslands. Of the variability not explained by regression analysis, one‐half may be due to the combined uncertainty associated with measurements of C concentrations, bulk density, and rock volume; natural within‐site variability; and site‐characteristic measurements. Other unexplained variability is probably due to potentially important but poorly documented site characteristics, such as recent vegetation composition, geomorphic disturbance regime, and fire history. Soil organic C content (SOC, kilograms C per square meter) and its relation to site characteristics are important in evaluating current regional, continental, and global soil C stores and projecting future changes. Data were compiled for 499 pedons in the largely forested, mountainous western Oregon region. The SOC of mineral soil ranged from 0.9 to 24 kg C m-2 (mean = 6.5) for 0- to 20-cm depth and 2.3 to 88 kg C m-2 (mean = 15.8) for 0- to 100-cm depth. Variability in each of the three terms that determine SOC-C concentration, bulk density, and rock volume-contributed substantially to SOC variation. Regression analysis of 134 forest pedons indicated that combinations of site characteristics explained up to 50% of the SOC variability. The SOC increased with annual temperature, annual precipitation, actual evapotranspiration, clay, and available water-holding capacity and decreased with slope. Relations for western Oregon differed qualitatively and quantitatively from those for other regions and contrasted with the decrease in SOC associated with increased temperature in Great Plains grasslands. Of the variability not explained by regression analysis, one-half may be due to the combined uncertainty associated with measurements of C concentrations, bulk density, and rock volume; natural within-site variability; and site-characteristic measurements. Other unexplained variability is probably due to potentially important but poorly documented site characteristics, such as recent vegetation composition, geomorphic disturbance regime, and fire history |
| Author | Sollins, P Stangenberger, A.G Chappell, H.N Homann, P.S. (Oregon State University, Corvallis, OR.) |
| Author_xml | – sequence: 1 fullname: Homann, P.S. (Oregon State University, Corvallis, OR.) – sequence: 2 fullname: Sollins, P – sequence: 3 fullname: Chappell, H.N – sequence: 4 fullname: Stangenberger, A.G |
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| Keywords | Soils Organic carbon Laboratory study Organic matter Soil testing Chemical analysis Soil horizons Forest soil Mineral soils Field study |
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| SubjectTerms | Agronomy. Soil science and plant productions ARCILLA ARGILE Biological and medical sciences CAPACIDAD DE RETENCION DE AGUA CAPACITE DE RETENTION D'EAU CARACTERISTICAS DEL SITIO CARBONE CARBONO Chemical, physicochemical, biochemical and biological properties DENSIDAD DENSITE DISPONIBILIDAD DEL AGUA EAU DISPONIBLE EVAPOTRANSPIRACION EVAPOTRANSPIRATION FACTEUR CLIMATIQUE FACTEUR LIE AU SITE FACTORES CLIMATICOS Fundamental and applied biological sciences. Psychology MATERIA ORGANICA MATIERE ORGANIQUE OREGON Organic matter Physics, chemistry, biochemistry and biology of agricultural and forest soils PROPIEDADES FISICO-QUIMICAS SUELO PROPRIETE PHYSICOCHIMIQUE DU SOL Soil science SOL SOL DE FORET SOL DE MONTAGNE SUELO SUELO DE MONTANA SUELO FORESTAL TOPOGRAFIA TOPOGRAPHIE VOLUME VOLUMEN |
| Title | Soil organic carbon in a mountainous, forested region: relation to site characteristics |
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