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Les concepts de ressource naturelle et de dégradation sont des constructions sociales. En témoignent les points de vue confrontés ici des transformations connues par la région brésilienne des Cerrados depuis les années 1960, assimilées à une mise en valeur par les uns et à un appauvrissement, voire une agonie, par les autres. La confrontation des points de vue des éleveurs (de type familial), à propos des pâturages et de leur dégradation, à ceux des techniciens confirme encore ce statut de construction sociale. Elle montre aussi que l'adoption matérielle d'innovations techniques (ici la fertilisation et la gestion tournante des pâturages) par les éleveurs nécessite également de leur part une reconstruction, voire une construction, des concepts de ressource et de dégradation. Cela témoigne plus généralement d'une activité conceptuelle socialement partagée et non confinée aux seuls lieux de la production officielle de connaissances. Cette analyse invite pour conclure à penser la gestion durable des ressources naturelles en termes d'intégrité fonctionnelle plutôt qu'en termes de stocks. The concept of degradation of a natural resource, a social construct. Pastures and small-scale farms in Brazil. The concepts of "natural resource" and "degradation" are social constructs. This point is emphasized by analyzing the discourses of Brazilian NGOs and agricultural research institutes working in the region of Cerrados in Central Brazil: their diagnoses on the colonization process of the region (from the 60's on) range from an "area of impoverishment" for the NGOs, to a "New Eldorado" for agricultural research institutes. These divergences highlight ideological and interest conflicts about what should be the "good uses" and "good users" of this region. They are also evident when analyzing the question of pasture degradation in small-scale farms in the Silvânia commune in the State of Goiás. The recent increase of dairy production in the small-scale farms of this commune has been sustained partly by an intensified use of pastures (e.g. strip grazing) as part of a wider technological package. The concept of pasture degradation was introduced with this innovation; it is mainly assessed in terms of the technical production potential and mainly concerns the soil. This concept has replaced the concept of "weakening", which concerns mainly the plant cover and is assessed by comparing it with the native vegetation. It has been shown that the adoption of the degradation conceptbyfarmers results from a change in the function of their pasture, rather than from a change in its state. It also becomes integrated into different representations of the animal farming system, which have shifted from a set of interactions to a representation in term of resource stocks. This analysis invites us to view the concept of sustainable development in terms of functional integrity of resources rather than in terms of managing resource stocks. [ABSTRACT FROM AUTHOR]