作者单位:
Environmental Sciences, Policy and Management, 137 Mulford Hall, University of California at Berkeley, CA 94 720-3114, USA
[1]
Programa de Pós-graduacao em Agroecologia, Universidade Estadual do Maranhao, PO Box 3004, S?o Luís, MA, Brazil
[2]
Agroecology, University of G?ttingen, Waldweg 26, D-37073, Gottingen, Germany
[3]
发布时间
2013-11-20