Modeling soil thermal and carbon dynamics of a fire chronosequence in interior Alaska

TitleModeling soil thermal and carbon dynamics of a fire chronosequence in interior Alaska
Publication TypeJournal Article
Year of Publication2002
AuthorsZhuang, Q, A. McGuire, D, O’Neill, KP, Harden, JW, Romanovsky, VE, Yarie, J
JournalJournal of Geophysical Research-Atmospheres
Date PublishedDec 14
ISBN Number0747-7309
Keywordsblack spruce ecosystems, boreal forest, carbon, changing climate, climate-change, discontinuous permafrost, equilibrium responses, fire, hydrology, jack pine, net primary production, nitrogen, Permafrost, terrestrial ecosystems, united-states

{In this study, the dynamics of soil thermal, hydrologic, and ecosystem processes were coupled to project how the carbon budgets of boreal forests will respond to changes in atmospheric CO2, climate, and fire disturbance. The ability of the model to simulate gross primary production and ecosystem respiration was verified for a mature black spruce ecosystem in Canada, the age-dependent pattern of the simulated vegetation carbon was verified with inventory data on aboveground growth of Alaskan black spruce forests, and the model was applied to a postfire chronosequence in interior Alaska. The comparison between the simulated soil temperature and field-based estimates during the growing season (May to September) of 1997 revealed that the model was able to accurately simulate monthly temperatures at 10 cm (R>0. 93) for control and burned stands of the fire chronosequence. Similarly, the simulated and field-based estimates of soil respiration for control and burned stands were correlated (R=0.84 and 0.74 for control and burned stands, respectively). The simulated and observed decadal to century-scale dynamics of soil temperature and carbon dynamics, which are represented by mean monthly values of these variables during the growing season, were correlated among stands (R=0.93 and 0.71 for soil temperature at 20- and 10-cm depths

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