Water, Air, and Soil Pollution

, Volume 64, Issue 1–2, pp 385–404 | Cite as

A geographically-based ecosystem model and its application to the carbon balance of the luquillo forest, Puerto Rico

  • Charles A. S. Hall
  • Marshall R. Taylor
  • Edwin Everham
Part IV Modeling Carbon Fluxes


We have developed a geography-based computer model of the Bisley Experimental Watershed ecosystem that simulates basic forest dynamics as a function of meteorological inputs and hydrologic simulation, as influenced by topography, soils, land use, and cover. The model is parameterized based on steady slate levels of, and hurricane impacts on, biomass, necromass and rate processes of the tabonuco forest, and is stable over decades. Over a 60 yr simulation (without hurricanes) leaf biomass remains approximately constant and woody biomass of those regions not having severe sunlight, moisture, or nutrient limitations increases slowly in agreement with observations. Necromass decreases slowly. Small quantities of C leave the ecosystem in stream water, especially during large rain events. When topographically-sensitive hurricane impacts are included, leaf and woody biomass are converted to necromass. In the model the recovery of the watersheds' hydrology, leaf and woody biomass, and necromass are consistent with field observations. We used this model to simulate the C dynamics of the forest over centurics using empirical values and found that (his forest acted to pump C from the atmosphere to the ocean at a rate of about 90 kg ha−1 yr−1.


Biomass Rate Process Field Observation Stream Water Rain Event 
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Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Charles A. S. Hall
    • 1
  • Marshall R. Taylor
    • 2
  • Edwin Everham
    • 3
  1. 1.SUNY College of Environmental Science and ForestrySyracuseUSA
  2. 2.Resources Planning Associates, Incorporated Cornell Business and Technology ParkIthacaUSA
  3. 3.SUNY College of Environmental Science and ForestrySyracuseUSA

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