Long-term ecosystem level experiments at Toolik Lake, Alaska, and at Abisko, Northern Sweden: generalizations and differences in ecosystem and plant type responses to global change

M.T. van Wijk, K.E. Clemmensen, G.R. Shaver, M. Williams, T.V. Callaghans, F.S. Chapin, J.H.C. Cornelissen, L. Gough, S.E. Hobbie, S. Jonasson, J.A. Lees, A. Michelsen, M.C. Press, S.J. Richardsons, H. Rueth