Although officially created, the protected reserve of Ngiri remains virtual, existing only on paper, many reasons can explain this hypothesis: - The insufficient national regulations, at least at the time of the establishment of this protected reserve, which had the effect of not having any application at the local level. - Conflicts of administrative and community interest arising from the overlapping of different laws or measures. - The authorities’ lack of interest in safeguarding biodiversity or the priorities given to other aspects of environmental management (development of fishing). - The local situation too complicated due to various conflicts between fishermen and eco-guards. - The lack of qualified personnel, of means, in particular financial resources, to implement measures for the sustainable management of the reserve. - The lack of skills in assessing the state of the environment and planning management. - The poor definition of the limits of the protected reserve, thus reducing its interest for the fauna and flora. - The very significant human pressure on the outskirts and the lack of ecological corridors to connect the reserve. - The lack of economic valuation of the said reserve.

Each year the world's forests in general and / or the hinterland of Kinshasa (DRC) in particular is reduced because it is managed as a mine, that is to say, we draw without restitution. The forest contains much more than wood, the main source of income for the peasants. How is the production of wood fuels practiced? What are the cumulative effects of income from non-rational production of wood fuels? These two situations led us to assume that the causes are multiple and interrelated, generating various impacts. They are summarized in the reduction of biodiversity, the instability of the forest ecosystem, the depletion of a large part of the plant resources on which many economies are based. This article determines some cumulative effects on farmers' incomes.