Plant Strategies and the Dynamics and Structure of Plant Communities

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Princeton University Press, 21 mar 1988 - 360 pagine

Although ecologists have long considered morphology and life history to be important determinants of the distribution, abundance, and dynamics of plants in nature, this book contains the first theory to predict explicitly both the evolution of plant traits and the effects of these traits on plant community structure and dynamics. David Tilman focuses on the universal requirement of terrestrial plants for both below-ground and above-ground resources. The physical separation of these resources means that plants face an unavoidable tradeoff. To obtain a higher proportion of one resource, a plant must allocate more of its growth to the structures involved in its acquisition, and thus necessarily obtain a lower proportion of another resource. Professor Tilman presents a simple theory that includes this constraint and tradeoff, and uses the theory to explore the evolution of plant life histories and morphologies along productivity and disturbance gradients.

The book shows that relative growth rate, which is predicted to be strongly influenced by a plant's proportional allocation to leaves, is a major determinant of the transient dynamics of competition. These dynamics may explain the differences between successions on poor versus rich soils and suggest that most field experiments performed to date have been of too short a duration to allow unambiguous interpretation of their results.


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The Isocline Approach to Resource Competition
Mechanisms of Competition for Nutrients and Light
Allocation Patterns and Life Histories
Vegetation Patterns on Productivity and Loss Rate Gradients
The Dynamics of Plant Competition
Secondary Succession on a Minnesota Sandplain
Questions and Conclusions
Mathematics of the Model ALLOCATE
Author Index

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Pagina iii - There is a very extensive literature in which it is demonstrated repeatedly that the [competitive] balance between a pair of species in mixture is changed by the addition of a particular nutrient, alteration of the pH, change in the level of the water table, application of water stress or of shading.
Pagina iii - It is very doubtful whether such experiments have contributed significantly either to understanding the mechanism of "competition" or to generalizing about its effects.

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