Biodiversity, sustainable development and nature conservation are fundamental issues
nowadays. All companies, administrations, governments and international organisations take these
issues into consideration. Sustainable forest management always requires a compromise between
profitability and conservation and in this fragile equilibrium, forest certification plays a key scheme.
This sustainable management is of great importance in the European Union (EU), with the Forest
Stewardship Council playing a fundamental role in forest certification. This certification forms the
basis of the ecosystem conservation and improvement strategy in Ence, Energía y Celulosa, the leading
company dedicated to the production of eucalyptus in Spain; (2) A three-phase protocol (identification
of High Conservation Values, assessment of conservation areas and monitoring program), has been
developed, providing clear, objective criteria, particularly concerning FSC (Forest Stewardship
Council) Principle 9, the primary goal being the development and application of these objective
criteria in the Ence conservation areas in the province of Huelva (Spain). One of the main criteria
for habitat classification was correspondence with the habitats listed in Annex I of the Habitats
Directive. The compatibility between forest exploitation management and conservation proposed by
the Natura 2000 network encouraged us to use this methodology for the identification, classification
and assessment of High Conservation Values considered in FSC forest certification: Principle 9;
(3) The study encompasses 183 forest management units covering 52,022 ha, with a total of 11,847.45
ha being identified as High Conservation Value Areas. Through the identification and assessment
of the conservation areas, the described methodology played a crucial role in demonstrating the
positive impact of Ence’s certified forest management on the conservation of biological diversity;
(4) This study demonstrates that an objective and reliable identification, assessment and monitoring
methodology, with a proven high degree of accuracy in the location and characterisation of interesting
and representative habitats in the region, can be implemented. Due to its objectivity, this strategy
can be easily applied to other European sustainable forest management sites and possibly to other
countries outside the EU.