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Twenty-four years after theYellowstone Fires: Are postfire lodgepole pine stands converging in structure and
Ecology
|June 29, 2016
Summary
Nearly 25 years after the Yellowstone Fires, lodgepole pine forest structure and function show limited convergence. Early regeneration patterns still dominate, with functional convergence expected sooner than structural convergence.
Area of Science:
- Ecology and ecosystem dynamics following large-scale disturbances.
- Forest regeneration and succession processes in wilderness areas.
Background:
- Understanding how landscape patterns of ecosystem structure and function evolve after major disturbances is crucial but poorly understood.
- The 1988 Yellowstone Fires provide a unique, long-term study site for tracking post-disturbance ecosystem recovery in lodgepole pine forests.
Purpose of the Study:
- To assess changes in postfire stand structure and function between 11 and 24 years after the 1988 Yellowstone Fires.
- To identify variables explaining these changes and evaluate shifts in landscape-level variability of stand structure and function.
Main Methods:
- Resampling of 72 permanent plots established 11 years postfire to track changes over the subsequent 13 years (up to 24 years postfire).
- Analysis of stand structure (stem density, biomass) and function (aboveground net primary production) in lodgepole pine (Pinus contorta var. latifolia) forests.
- Statistical modeling to determine drivers of change and landscape variation.
Main Results:
- Postfire lodgepole pine density remained high, increasing in most plots but declining sharply in stands with initial densities over 72,000 stems/ha.
- Stand-level leaf area, foliage biomass, and live aboveground biomass increased with time and stem density.
- Aboveground net primary production (ANPP) was strongly driven by stem density (69% variation explained), with early regeneration patterns remaining dominant.
Conclusions:
- Stand structure and function have not converged across the landscape 24 years postfire, with initial regeneration patterns still controlling trajectories.
- Mechanisms for stem density convergence were observed, but landscape variation in functional variables declined significantly.
- Ecosystem function is predicted to converge more rapidly than ecosystem structure in these post-fire lodgepole pine forests.
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