Transport refers to the physical processes that move N-containing substances within and between
biogeochemical spheres, reservoirs, or pools. Table 1 gives some examples of inter-sphere
Table 2 gives some examples of inter-pool transport.
Transport within a pool involves advection (movement with the bulk fluid) and dispersion (movement in response to concentration gradients, due to small scale random fluid motion). In water bodies, examples include mixing and dilution of N from point sources such as a wastewater outfalls or landfills.