By Steward T.A. Pickett, P. S. White
Ecologists are conscious of the significance of typical dynamics in ecosystems. traditionally, the point of interest has been at the improvement in succession of equilibrium groups, which has generated an realizing of the composition and functioning of ecosystems. lately, many have considering the approaches of disturbances and the evolutionary importance of such occasions. This shifted emphasis has encouraged reviews in assorted platforms. The word "patch dynamics" (Thompson, 1978) describes their universal concentration.
The Ecology of usual Disturbance and Patch Dynamics brings jointly the findings and concepts of these learning diverse platforms, providing a synthesis of numerous person contributions.
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Extra resources for The Ecology of Natural Disturbance and Patch Dynamics
5 - 4 0 cm) stems of N. alpina in the most undisturbed stands indicates that regeneration be neath treefall gaps must be rare; the saplings that establish beneath gaps apparently fail to develop unless the stand is affected by larger-scale disturbances. The failure, or at least the infrequency, of N. dombeyi and N. alpina to attain main canopy stature by developing beneath treefall gaps in otherwise undisturbed stands contrasts markedly to the regenerative behavior of the more shade-tolerant trees of the upper montane zone.
These two different vegetation types were characterized by substantially different disturbance regimes, which interacted with the soils and topographic positions to determine the vegetation. White pine was associated with disturbances such as fires and windthrows large enough to allow light to reach the forest floor and severe enough to expose mineral soil. Fire frequency in the region is greater than in the Appalachian mountains, although less than in the forests of northern Minnesota (Bormann and Likens, 1979).
However, the elimination of many small hemlock stems is a concern and may result in sharp decreases in hemlock density in the future. On the other hand, hemlock regeneration in much of the region occurs irregularly, so the species may be able to survive a prolonged period of very little regeneration (Hough and Forbes, 1943). Another change in disturbance regime affected by human use has been the elim ination of large stems and therefore a decrease in the rate of gap formation. Forests characterized by small-scale disturbances have a sizeable fraction of their total area in or near gaps.
The Ecology of Natural Disturbance and Patch Dynamics by Steward T.A. Pickett, P. S. White