Allometric scaling of plant energetics and population density

Brian Enquist, James H. Brown, Geoffrey B. West

Research output: Contribution to journalArticle

596 Citations (Scopus)

Abstract

Scaling relationships that describe variation in population density with body size in ecological communities, such as the thinning law in plant ecology, can be explained in terms of how individuals use resources as a function of their size. Data for rates of xylem transport as a function of stem diameter show that rates of resource use in individual plants scale as approximately the 3/4 power of body mass, which is the same as metabolic rates of animals. Here we use this relationship to develop a mechanistic model for relationships between density and mass in resource-limited plants. It predicts that average plant size should scale as the -4/3 power of maximum population density, in agreement with empirical evidence and comparable relationships in animals, but significantly less than the -3/2 power predicted by geometric models. Our model implies that fundamental constraints on metabolic rate are reflected in the scaling of population density and other ecological and evolutionary phenomena, including the finding that resource allocation among species in ecosystems is independent of body size.

Original languageEnglish (US)
Pages (from-to)163-165
Number of pages3
JournalNature
Volume395
Issue number6698
DOIs
StatePublished - Sep 10 1998
Externally publishedYes

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population density
body size
plant ecology
mechanistic models
resource allocation
thinning (plants)
xylem
animals
stems
ecosystems

ASJC Scopus subject areas

  • General

Cite this

Allometric scaling of plant energetics and population density. / Enquist, Brian; Brown, James H.; West, Geoffrey B.

In: Nature, Vol. 395, No. 6698, 10.09.1998, p. 163-165.

Research output: Contribution to journalArticle

Enquist, Brian ; Brown, James H. ; West, Geoffrey B. / Allometric scaling of plant energetics and population density. In: Nature. 1998 ; Vol. 395, No. 6698. pp. 163-165.
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