HR: 17:30h
AN: H32H-07    [PDF]
TI: NONLINEAR DYNAMICS OF SOIL MOISTURE AND MINERAL NITROGEN
AU: Porporato, A
EM: amilcare.porporato@polito.it
AF: Dept. of Civil and Environmental Engineering Duke University, Hudson Hall, Durham, NC 27708 United States
AU: D'Odorico, P
EM: paolo@virginia.edu
AF: Department of Environmental Sciences University of Virginia, 291 McCormick Road, Charlottesville, VA 22904 United States
AU: * Manzoni, S
EM: malvirata@supereva.it
AF: Dept. of Civil and Environmental Engineering Duke University, Hudson Hall, Durham, NC 27708 United States
AU: Rodriguez-Iturbe, I
EM: irodrigu@princeton.edu
AF: Dept. of Civil and Environmental Engineering Princeton University, Olden Street, Princeton, NJ 08540 United States
AB: We investigate the behavior of simple dynamical systems describing the temporal dynamics of soil moisture, plant growth, soil organic matter, and mineral nitrogen. The equilibrium condition of the deterministic system are analyzed as a function of the climate, soil, and vegetation parameters, along with the possible bifurcations of the system to regimes of periodic or aperiodic oscillations. Particular attention is devoted to the soil moisture control on the dynamics of plant uptake of nitrogen and water and to the role of the delay in litter incorporation into the soil and its subsequent mineralization. A preliminary analysis of the system dynamics under conditions of stochastic environmental fluctuation (rainfall in particular) is also presented.
DE: 1030 Geochemical cycles (0330)
DE: 1809 Desertification
DE: 1851 Plant ecology
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2003 Fall Meeting