Long-term oscillations in grassland productivity induced by drought

Disturbances such as drought have immediate impacts on ecosystem functioning, but little is known about long‐term dynamic consequences of disturbance. Here, we show that a major drought perturbed prairie grassland from nearly constant average annual production, and induced 9 years of oscillations wi...

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Published inEcology letters Vol. 5; no. 1; pp. 110 - 120
Main Authors Haddad, Nick M., Tilman, David, Knops, Johannes M. H.
Format Journal Article
LanguageEnglish
Published Oxford UK Blackwell Science Ltd 01.01.2002
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Abstract Disturbances such as drought have immediate impacts on ecosystem functioning, but little is known about long‐term dynamic consequences of disturbance. Here, we show that a major drought perturbed prairie grassland from nearly constant average annual production, and induced 9 years of oscillations with a 2‐year period. This pattern occurred in unmanipulated plots in many widely separated fields that were part of two different long‐term studies. Using direct and indirect tests, we could reject the hypothesis that the oscillations were externally imposed by climate or herbivores. Weak evidence supported the hypothesis that oscillations were internally generated, caused by a litter and nitrogen dependent feedback on productivity. This hypothesis was supported by the results of two other long‐term studies, in which burning and, separately, nitrogen addition eliminated the 2‐year oscillations in plant production. However, more direct evidence failed to support the litter hypothesis. A final, but untested hypothesis was suggested by the observation that production tended to be synchronized amongst dominant plants. Drought may have synchronized production dynamics amongst plants with biennially greater allocation to above‐ground growth. Regardless of the specific mechanism, our results show that a single disturbance may have long‐lasting effects on the dynamics of plant production.
AbstractList Disturbances such as drought have immediate impacts on ecosystem functioning, but little is known about long-term dynamic consequences of disturbance. Here, we show that a major drought perturbed prairie grassland from nearly constant average annual production, and induced 9 years of oscillations with a 2-year period. This pattern occurred in unmanipulated plots in many widely separated fields that were part of two different long-term studies. Using direct and indirect tests, we could reject the hypothesis that the oscillations were externally imposed by climate or herbivores. Weak evidence supported the hypothesis that oscillations were internally generated, caused by a litter and nitrogen dependent feedback on productivity. This hypothesis was supported by the results of two other long-term studies, in which burning and, separately, nitrogen addition eliminated the 2-year oscillations in plant production. However, more direct evidence failed to support the litter hypothesis. A final, but untested hypothesis was suggested by the observation that production tended to be synchronized amongst dominant plants. Drought may have synchronized production dynamics amongst plants with biennially greater allocation to above-ground growth. Regardless of the specific mechanism, our results show that a single disturbance may have long-lasting effects on the dynamics of plant production.
Author Haddad, Nick M.
Knops, Johannes M. H.
Tilman, David
Author_xml – sequence: 1
  givenname: Nick M.
  surname: Haddad
  fullname: Haddad, Nick M.
  organization: Department of Ecology, 1987 Upper Buford Circle, University of Minnesota, St. Paul, MN 55108, USA
– sequence: 2
  givenname: David
  surname: Tilman
  fullname: Tilman, David
  organization: Department of Ecology, 1987 Upper Buford Circle, University of Minnesota, St. Paul, MN 55108, USA
– sequence: 3
  givenname: Johannes M. H.
  surname: Knops
  fullname: Knops, Johannes M. H.
  organization: Department of Biological Sciences, University of Nebraska, Lincoln, NE 68588, USA
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Snippet Disturbances such as drought have immediate impacts on ecosystem functioning, but little is known about long‐term dynamic consequences of disturbance. Here, we...
Disturbances such as drought have immediate impacts on ecosystem functioning, but little is known about long-term dynamic consequences of disturbance. Here, we...
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StartPage 110
SubjectTerms ANPP
community dynamics
disturbance
drought
litter
long-term research
nitrogen
oscillations
primary production
synchronous production
Title Long-term oscillations in grassland productivity induced by drought
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https://onlinelibrary.wiley.com/doi/abs/10.1046%2Fj.1461-0248.2002.00293.x
https://search.proquest.com/docview/18281270
Volume 5
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