The Ecology of Natural Disturbance and Patch Dynamics by Steward T.A. Pickett, P. S. White

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

Ecologists are conscious of the significance of traditional dynamics in ecosystems. traditionally, the point of interest has been at the improvement in succession of equilibrium groups, which has generated an figuring out of the composition and functioning of ecosystems. lately, many have considering the procedures of disturbances and the evolutionary importance of such occasions. This shifted emphasis has encouraged reports 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 different structures, offering a synthesis of numerous person contributions.

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II. III. IV. V. VI. Introduction Treefall Regimes A. Gap Creation B. Gap Environment Regeneration Behavior A. Primary Tree Species B. Pioneer Tree Species C. Understory Plants, Palms, Lianas, and Herbs ^3 4 54 58 0 0 1 63 4 Regrowth Community Structure Conclusions 6 8 I. INTRODUCTION The idea that tropical forest is a structural or floristic mosaic dates at least from Aubréville's 1937 "mosaic theory of regeneration" (cited in Richards, 1952). Since then, authors have depicted this community as a mosaic of treefall-created patches differing in age, size, and species composition (Jones, 1950; Richards, 'Present address: Manomet Bird Observatory, P .

1976). Composition y dinâmica regenerativa de un bosque virgen mixto de rauli y coigue. Bosque 1 , 5 5 - 7 4 . Donoso Z . , C. (1981). "Tipos Forestales de Los Bosques Nativos de C h i l e . " Corporation Nacional Forestal, Santiago, Chile. Heusser, C . J . (1974). Vegetation and climate of the southern Chilean Lake District during and since the last interglaciation. Quat. Res. 4, 2 9 0 - 3 1 5 . Veblen, T. T. (1982). Growth patterns of Chusquea bamboos in the understory of Chilean Nothofagus forests and their influences in forest dynamics.

S Q-l H-l 500 620 60 pumilio 2754 1000 139 N. N. pumilio dombeyi 3888 3888 1120 810 150 N. dombeyi 3888 940 Estimated ages. 0 η = 3 250" 28 16 20 34 40 44 Thomas T. 0 cm n = 186 2 6 years I = 2 . 0cm η = 16 1 , | m 30- Ι 20- I Ε Ιι , | | | 5 10 15 20 ill 25 30 35 40 45 50 TRUNK DIAMETER (cm) Fig. 2. Frequency distributions of trunk diameters (at breast height) for Nothofagus spp. in approx­ imately even-aged stands. I, the interval of trunk diameters between two successive bars in the histo­ gram, was determined by dividing the range of diameters observed into 12 or 13 equal intervals.

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