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Structural and Functional Responses of a Subtropical Forest to 10 Years of Hurricanes and Droughts
Ecological Monographs (2005)
  • Karen H. Beard, Utah State University
  • K. A. Vogt
  • D. J. Vogt
  • F. N. Scatena
  • A. Covich
  • T. C. Siccama
  • R. Sigurdardottier
  • T. A. Crowl
Little is known about ecosystem-level responses to multiple, climatic disturbance events. In the subtropical forests of Puerto Rico, the major natural disturbances are hurricanes and droughts. We tested the ecosystem-level effects of these disturbances in sites with different land use histories. From 1989 to 1992, data were collected to determine the effects of Hurricane Hugo and two droughts on litterfall inputs, fine-root biomass, and decomposition rates in three topographic locations (stream, riparian, upslope) within two watersheds. From 1994 to 1998, we added a third watershed and an experiment in which coarse-wood levels were manipulated to simulate hurricane inputs. Data were collected on tree and palm growth rates, litterfall inputs, fine-root biomass, and decomposition rates. From 1994 to 1998, four hurricanes and three droughts were recorded. Measured parameters had unique responses and recovery rates to hurricanes and droughts. Litterfall inputs returned to long-term mean rates within one month following droughts and small-to-moderate hurricanes but required five years to recover after an intense hurricane. In contrast, fine-root biomass recovered seven months after an intense hurricane but failed to recover after five years following a severe drought. Despite the dramatic effects of these weather events on some ecosystem parameters, we found that aboveground measures of tree and palm growth were more affected by preexisting site conditions (e.g., nitrogen availability due to past land use activities) than hurricanes or droughts. ...
  • decomposition; disturbance; drought; fine roots; hurricane; land use legacy; litterfall; Luquillo Experimental Forest; productivity; Puerto Rico; recovery; tropics
Publication Date
August, 2005
Citation Information
Beard, K.H., K.A. Vogt, D.J. Vogt, F.N. Scatena, A. Covich, T.C. Siccama, R. Sigurdardottir, and T.A. Crowl. 2005. Structural and functional responses of a subtropical forest to 10 years of hurricanes and droughts. Ecological Monographs (75)3:345-361.