%0 Report %D 1997 %T Natural vegetation responses to atmospheric nitrogen deposition - critical levels and loads of nitrogen for vegetation growing on contrasting native soils %A Carroll, J.A. %A Caporn, S.J.M. %A Morecrof, M.D. %A Lee, J.A. %A Johnson, D. %A Taylor, A. %A Leake, J.R. %A Campbell, C.D. %A Cawley, L. %A Lei, Y. %A Read, D.J. %I University of Sheneld %C Sheneld %G eng