Affiliation: | 1Research Assistant, Dept. Land Management, K.U.Leuven, Vital Decosterstraat 102, B-3000 Leuven, Belgium. 2Professor, Dept. Land Management, K.U.Leuven, Vital Decosterstraat 102, B-3000 Leuven, Belgium (corresponding author). E-mail: dirk.raes@biw.kuleuven.be 3Senior Researcher, CIRAD-TERA, 73 av. Jean-Fran?ois Breton, TA 60/115, 34398 Montpellier Cedex 5, France. 4Senior Researcher, EMBRAPA-CPATSA, BR 428, Km 152, Zona Rural, Petrolina-PE, Brazil. 5Master Student, Dept. Land Management, K.U.Leuven, Vital Decosterstraat 102, B-3000 Leuven, Belgium.
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