Ton, P.

research study development management environment resource africa project production terre égradation des terres sahel culture égradation strategy livelihood strategies dutch sub-saharan africa amsterdam wageningen van den breemer livelihood programme section agriculture entre system country netherland conservation sub-saharan university policy exploitation recherche water department research projects syst èmes paper burkina faso centre technology attention forestry land use problem contribution context chapter éveloppement degradation theme african gestion effet b énin kenya analyse pratique approach economie leveur probl durabilit égradation v ég population production cotonni ère égion aussi household conomique analysent fes /uva input paysan terroir forest field researcher