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Ecological optimality in water-limited natural soil-vegetation systems. I - Theory and hypothesisThe solution space of an approximate statistical-dynamic model of the average annual water balance is explored with respect to the hydrologic parameters of both soil and vegetation. Within the accuracy of this model it is shown that water-limited natural vegetation systems are in stable equilibrium with their climatic and pedologic environments when the canopy density and species act to minimize average water demand stress. Theory shows a climatic limit to this equilibrium above which it is hypothesized that ecological pressure is toward maximization of biomass productivity. It is further hypothesized that natural soil-vegetation systems will develop gradually and synergistically, through vegetation-induced changes in soil structure, toward a set of hydraulic soil properties for which the minimum stress canopy density of a given species is maximum in a given climate. Using these hypotheses, only the soil effective porosity need be known to determine the optimum soil and vegetation parameters in a given climate.
Document ID
19820058007
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Eagleson, P. S.
(MIT Cambridge, MA, United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1982
Publication Information
Publication: Water Resources Research
Volume: 18
Subject Category
Geophysics
Accession Number
82A41542
Funding Number(s)
CONTRACT_GRANT: NAG5-134
CONTRACT_GRANT: NAG5-89
Distribution Limits
Public
Copyright
Other

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