By Steward T.A. Pickett, P. S. White

Ecologists are conscious of the significance of ordinary 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 involved in the strategies of disturbances and the evolutionary value of such occasions. This shifted emphasis has encouraged stories in varied platforms. The word "patch dynamics" (Thompson, 1978) describes their universal concentration.
The Ecology of typical Disturbance and Patch Dynamics brings jointly the findings and concepts of these learning various platforms, providing a synthesis of numerous person contributions.

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28 ha η = 48 2oH ι (H I b _ I I I I I I I I I I I I 30-1 i 20H LU => σ H Un Ιι τ—ι—ι—r N. 91 ha n = 4l τ τ N. 55 ha n= 2 0 3020100-- τ ~ τ — » t »—ι—ι—rnr"T—ΓΓιΤι" 10 15 20 25 SIZE CLASS Frequency distributions of Nothofagus spp. in size classes in old-growth stands. The size ι—ι—ι—ι—ι—r"T—r S Fig. 3 . 5 classes used are S (saplings) for trees < 5 cm dbh but at least 2 m tall, and 1-26 for trees in 10-cm-dbh classes from 5 to 265 cm. 48 Thomas T. Veblen absence of stand-devastating disturbances, N.

All rights of reproduction in any form reserved. ISBN 0-12-554520-7 53 54 Nicholas V. L. Brokaw 1952; Baur, 1964; Whitmore, 1975; Oldeman, 1978; Hladik, 1982). Treefall gaps are one phase in a forest regeneration cycle; colonization and growth in the gap phase lead to building and then mature phases, in which treefalls renew the cycle (Whitmore, 1975; Halle et ai, 1978; Oldeman, 1978). , Hartshorn, 1980). Thus, endogenous disturbance by treefalls is central to the function and structure of this community.

2 5 ha) and that the frequency of these disturbances prevents the successional replace­ ment of the Nothofagus spp. by the shade-tolerant tree species. III. PATCH DYNAMICS A. Large Patch Initiation The hypothesis that the abundance of Nothofagus in the mid- and low-elevation Andean forests is largely a consequence of periodic massive disturbances was developed as a direct result of the 1960 earthquake that devastated southern Chile. 5 on the Richter scale (Wright and Mella, 1963; SaintAmand, 1962).

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