Promoting open spaces in a forest park as a means of increasing biodiversity

At the end of the XIX century, Collserola Natural Park was devoted to agricultural activities. However, with the arrival of the phylloxera epidemic, many vineyards crop fields were abandoned. In addition, during last 50 years, the remaining owners have abandoned farming activities because of the low productivity of the crops. Today, Collserola is mainly covered by forest. This reduces open spaces and habitats diversity, and therefore biodiversity since many species depend on open spaces for shelter or forage. The solution taken is the consolidation of existing farmland & the recovery of abandoned fields (dry farming) and to use herds of sheeps to maintain scattered open spaces within the forest.
Thus, Collserola has defined an Agricultural Plan to promote the use of farmland. Some of the actions are:
To put in contact landowners with active farmers from the park or from outside the park, that are willing to farm in the park;
The park itself farms 20 hectares of public land;To require abandoned farms that open an economic activity (such as a Restaurant) to farm a portion of their land in order to get their permit;
The creation of a quality brand issued by the Park;
The promotion of herds of sheep and goats.