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  • 1
    Electronic Resource
    Electronic Resource
    Forest soil carbon inventories and dynamics along an elevation gradient in the southern Appalachian Mountains (1999)
    Springer
    Biogeochemistry 45 (1999), S. 115-145 
    Details
    ISSN: 1573-515X
    Keywords: climate ; C/N ratios ; light-fraction organic matter ; particulate organic matter ; soil C turnover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Soil organic carbon (SOC) was partitioned between unprotected and protected pools in six forests along an elevation gradient in the southern Appalachian Mountains using two physical methods: flotation in aqueous CaCl2 (1.4 g/mL) and wet sieving through a 0.053 mm sieve. Both methods produced results that were qualitatively and quantitatively similar. Along the elevation gradient, 28 to 53% of the SOC was associated with an unprotected pool that included forest floor O-layers and other labile soil organic matter (SOM) in various stages of decomposition. Most (71 to 83%) of the C in the mineral soil at the six forest sites was identified as protected because of its association with a heavy soil fraction (〉1.4 g/mL) or a silt-clay soil fraction. Total inventories of SOC in the forests (to a depth of 30 cm) ranged from 384 to 1244 mg C/cm2. The turnover time of the unprotected SOC was negatively correlated (r=−0.95, p〈0.05) with mean annual air temperature (MAT) across the elevation gradient. Measured SOC inventories, annual C returns to the forest floor, and estimates of C turnover associated with the protected soil pool were used to parameterize a simple model of SOC dynamics. Steady-state predictions with the model indicated that, with no change in C inputs, the low-(235–335 m), mid-(940–1000 m), and high-(1650–1670 m) elevation forests under study might surrender ≈ 40 to 45% of their current SOC inventory following a 4°C increase in MAT. Substantial losses of unprotected SOM as a result of a warmer climate could have longterm impacts on hydrology, soil quality, and plant nutrition in forest ecosystems throughout the southern Appalachian Mountains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106778
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of climate, soil moisture, and succession on forest carbon and nitrogen cycles (1986)
    Springer
    Biogeochemistry 2 (1986), S. 3-27 
    Details
    ISSN: 1573-515X
    Keywords: Carbon ; climate ; forests ; landscape ecology ; nitrogen ; productivity ; soil moisture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The interactions between the biotic processes of reproduction, growth, and death and the abiotic processes which regulate temperature and water availability, and the interplay between the biotic and abiotic processes regulating N and light availabilities are important in the dynamics of forest ecosystems. We have developed a computer simulation that assembles a model ecosystem which links these biotic and abiotic interactions through equations that predict decomposition processes, actual evapo-transpiration, soil water balance, nutrient uptake, growth of trees, and light penetration through the canopy. The equations and parameters are derived directly from field studies and observations of forests in eastern North America, resulting in a model that can make accurate quantitative predictions of biomass accumulation, N availability, soil humus development and net primary production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186962
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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