Oscillations and chaos in the dynamics of a perennial grass

David Tilman, David Wedin

Research output: Contribution to journalArticlepeer-review

127 Scopus citations

Abstract

ECOLOGICAL models describe the conditions required for chaotic population dynamics1-7, but there are few studies with which to test these predictions4,8-10, and none for perennial plants. In a five-year experiment, a perennial grass exhibited numerous traits associated with chaotic dynamics. Biomass oscillations were greater on more productive soils, with plots on the richest soils exhibiting a 6,000-fold crash. Curves relating the biomass one year to that in the previous year had the peaks and steep slopes associated with chaos, and the dependence of plant biomass on productivity became fuzzy over time. These dynamics resulted from the time-delayed inhibitory effect of plant litter on subsequent growth. A model incorporating litter inhibition predicts oscillations and chaos as productivity increases.

Original languageEnglish (US)
Pages (from-to)653-655
Number of pages3
JournalNature
Volume353
Issue number6345
DOIs
StatePublished - Jan 1 1991

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