Empirical and theoretical challenges in aboveground–belowground ecology

W.H. Van der Putten, R.D. Bardgett, P.C. de Ruiter, W.H.G. Hol, K.M. Meyer, T.M. Bezemer, M.A. Bradford, S. Christensen, M.B. Eppinga, T. Fukami, L. Hemerik, J. Molofsky, M. Schädler, C. Scherber, S.Y. Strauss, M. Vos, D.A. Wardle