Hierarchy of search terms and their resulting amount after the Advanced search in Scopus®.

  Part of: Schmidt M, Weißhuhn P, Augustin J, Funk R, Häfner K, König H, Loft L, Merz C, Meyer C, Piorr A, Reutter M, Stachow U, Stein-Bachinger K, Matzdorf B (2017) Evaluation of the ecosystem services approach in agricultural literature. One Ecosystem 2: e11613. https://doi.org/10.3897/oneeco.2.e11613