What is the most ecologically-meaningful metric of nitrogen deposition?

Richard Payne (Corresponding Author), C Campbell, Andrea J. Britton, Ruth Mitchell, Robin J. Pakeman, Laurence Jones, Louise C Ross, Carly J. Stevens, C Field, Simon Caporn, J Carroll, J Edmondson, E Carnell, S Tomlinson, A Dore, Nancy B. Dise, Ulrike Dragisits