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TOPIC OUTLINE . Introduction Study Site Methods of analysis Results Future DirectionsAcknowledgementsReferences. Introduction . Regional landscape has ** little climatic seasonality ** strong climate gradient up the mountain ** high inter-annual variability due to storm
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1. Time scales of ecological processes at LUQ LTER
2. TOPIC OUTLINE Introduction
Study Site
Methods of analysis
Results
Future Directions
Acknowledgements
References
3. Introduction Regional landscape has
** little climatic seasonality
** strong climate gradient up the mountain
** high inter-annual variability due to storms
** geology of Tabonuco forest constant
11. Methods of analysis Turn over time = material quantity in reservoir / annual average flux
Recovery time = post disturbance time for a structure or flux to return to pre-disturbance condition
Relative disturbance effectiveness = disturbance flux / average long term flux
16. More about the forest canopy Recovery time of closedness @ 1 m (hurricane) = ~ 3 years
Turnover time of leaf biomass (background) = 0.99 to 1.3 yrs
Turnover time of leaf biomass (hurricane) = 50 yrs
Relative effectiveness ( hurricane / background) 700/1.54=455
17. DISCUSSION 160 Turnover times & 55 recovery times span 12 orders of magnitude
Mountains slowest
Land forms next slowest
Turn over of forest biomass - decades
Water and nutrients cycled in scales of days to years
Significance of these findings for
Ecosystem science
Resource Management
18. Conclusion: Luquillo Landscape Dynamic complex of subsystems in which
recovery times increase as the turn over times increase.
Component responses to disturbances and recovery occur at different rates
Steady state conditions are rarely achieved between all abiotic and biotic components.
Comparisons of turn over times, recovery times and relative effectiveness following disturbances in different LTER sites are likely to be instructive
19. QUESTIONS FOR FUTURE RESEARCH Stoichiometry of turnover times , recovery times, and relative disturbance effectiveness
( See Sterner & Elser. 2002; Wardle et al. 2004 )
If stoichiometries exist, what are underlying causes?
LTER network wide investigation and synthesis
20. ACNOWLEDGEMENTS NSF BSR-8811902
International Institute of Tropical Forestry
Institute for Tropical Ecosystem Studies
University of Puerto Rico
Plant Biology Dept. University of Georgia
21. References Haines et al. 2005.Time scales of ecological processes at LUQ LTER this PowerPoint presentation available at
.www.plantbio.uga.edu/~haines/haines.html
Haines, B.L. and N. Brokaw (unpubl) Canopy recovery after hurricane disturbance in the Luquillo Experimental Forest, Puerto Rico
Scatena, F.N. 1995. Relative scales of time and effectiveness of watershed processes in a tropical montane rain forest in Puerto Rico. American Geophysical Union, Geophysical Monographs 89: 103-111.
Sterner, W & J. Elser. 2002. Ecological Stoichiometry. Princeton Univ
Wardle et al. 2004. Ecosystem properties and forest decline in contrasting long-term chronosequences. Science 305:509-513
22. archived on jump drive of hainesthis frame not for public consumption- it is Haines file archive information. File stored on computer named MIMOSA c:\_Haines\ESA-INTECOL-2005file name = LUQ LTER TIME SCALES 6 AUG 05 EDITION AAAALSO STORED ON HAINES 65 MB JUMP DRIVEales of ecological processes at LUQ LTERalso stored on 2 compact disks.