Watershed Scale Physically Based Water Flow, Sediment and Nutrient Dynamic Modeling System - Landscape Ecology for Sustainable Environment and Culture - page 161

mass transfer rate of NO 3 R NO3,e between the upper soil layer and surface

runoff [M/L 2 /T]

infiltration rate of soil layer NO 3 pool [M/L 2 /T] R NO3,f

external sources [M/L 2 /T]

NO s

concentration of the overland flow PON [M/L 3 ] PON ov

total concentration of organic N in the upper soil layer [M/L 3 ] orgN

k hn PON hydrolysis rate constant [1/T]

concentration of DON in the overland flow [M/L 3 ] DON ov

k mn DON mineralization rate constant [1/T]

NH 4 ov concentration of NH 4 in the overland flow [M/L 3 ]

k en effective mass transfer rate constant [L/T]

k nit nitrification rate constant [1/T]

R NH4,up

plant uptake rate of the overland flow NH 4 [M/L 3 /T]

NO 3 ov concentration of NO 3 in the overland flow [M/L 3 ]

plant uptake rate of the overland flow NO 3 [M/L 3 /T] R NO3,up

concentration of soil layer fresh organic P pool [M/L 3 ] orgP frs

decomposition rate of soil layer fresh organic P pool [M/L 2 /T] OP dec

OP min|imb net mineralization/immobilization rate of soil layer fresh organic P

pool [M/L 2 /T]

OP frs,e net surface erosion/deposition rate of soil fresh organic P pool

[M/L 2 /T]

external sources [M/L 2 /T] OP frs,s

concentration of soil layer active organic P pool [M/L 3 ]

orgP act

mineralization rate of soil humic active organic P pool [M/L 2 /T] OP min

OP trn rate transferred between the active and stable organic P pools

[M/L 2 /T]

OP act,e net surface erosion/deposition rate of soil humic active organic P pool

[M/L 2 /T]

external sources [M/L 2 /T] OP act,s

concentration of soil layer stable organic P pool [M/L 3 ] orgP sta

OP sta,e net surface erosion/deposition rate of soil humic stable organic P pool

[M/L 2 /T]

external sources [M/L 2 /T]

OP sta,s

concentration of soil layer soluble P pool [M/L 3 ] P sol

IP min total mineralization processes rate of soil layer organic P pools

[M/L 2 /T]

IP sol|act net sorption rate transferred between the soluble P pool and active

inorganic P pool [M/L 2 /T]

plant uptake rate of soil layer soluble P pool [M/L 2 /T] IP up

R DIP,e mass transfer rate of soluble P between the upper soil layer and

surface runoff [M/L 2 /T]

external sources [M/L 2 /T] IP s

concentration of soil layer active inorganic P pool [M/L 3 ] minP act