Paul
R.
Moorcroft, Harvard University, paul_moorcroft@harvard.edu
George
Hurtt, University of New Hampshire, george.hurtt@unh.edu
Steve
Pacala, Princeton University, steve@eno.princeton.edu
The Ecosystem Demography Model (ED) is a new terrestrial biosphere model designed to incorporate the effects of fine-scale physiological and ecological processes on large-scale ecosystem structure and function. The core of ED is a stochastic, individual-based, model of vegetation dynamics driven by climate, soil and land-use inputs. The growth, mortality, and recruitment dynamics of individuals are specified from a mechanistic leaf-level description of carbon, water, and nitrogen fluxes. Coupled to the dynamics of the above-ground plant canopy are dynamics of decomposition, nitrogen cycling and hydrology. The components of ED draw heavily on established sub-models formulated over the past two decades and on published data. The large-scale behavior of the ecosystem is captured using a system of size and age-structured moment equations that approximate the mean behavior of the underlying stochastic processes operating within each grid cell. ED has been implemented over a region of tropical and sub-tropical South America (15N to 15S).
Submetido por George Caleb Hurtt em 12-MAR-2004
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)