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  • 1985-1989  (2)
Document type
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Environmental factors and ecological processes controlling vegetation patterns in boreal forests (1989)
    Springer
    Landscape ecology 3 (1989), S. 111-130 
    Details
    ISSN: 1572-9761
    Keywords: boreal forest ; gap model ; forest dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An individual tree model of forest dynamics was used to examine the environmental and ecological factors controlling forest vegetation patterns in upland boreal forests of North America. Basic life history traits that characterized the regeneration, growth, and death of individual trees were combined with species-specific responses to important environmental factors. This model simulated forest structure and vegetation patterns in conifer, hardwood, and mixed conifer-hardwood forests and woodlands in several bioclimatic sub-regions of the North American boreal forest zone. Model testing identified the processes and parameters required to understand the ecology of upland boreal forests and weaknesses in our current understanding of these processes. These factors included climate, solar radiation, soil moisture, soil temperature and permafrost, the forest floor organic layer, nutrient availability, forest fires, and insect outbreaks. Model testing also identified which of these factors were important in each bioclimatic sub-region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00131174
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation of moss and tree dynamics in the boreal forests of interior Alaska (1989)
    Springer
    Plant ecology 84 (1989), S. 31-44 
    Details
    ISSN: 1573-5052
    Keywords: Feathermoss ; Gap model ; Picea mariana ; Sphagnum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We used a simulation model of forest dynamics to examine the ecological significance of the complex interactions among site conditions, tree growth, and the development of a thick forest floor moss layer found in many boreal forests. To examine the effect of site conditions on moss growth and forest dynamics, we simulated the dynamics of several different forest sites in the uplands of interior Alaska. Then we used a cold, wet permafrost site to examine the ecological consequences of direct moss and tree interactions. Our analyses revealed a tightly coupled system in which forest succession was highly sensitive to the interactions among site conditions, mosses, and trees. The effect of mosses on the soil thermal regime was a particularly important feedback. Direct interactions between mosses and trees that affected the development of a thick forest floor layer were also important. In particular, shading of moss by trees, reduced tree regeneration on moss-covered soils, and reduced moss growth with open forest canopies were also important determinants of forest succession. These complex feedbacks ensure that an ecosystem approach is needed to understand the ecology of boreal forests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054663
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    Paper (German National Licenses)
    Fulltext
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