Experimental research in ageing holm oak (Quercus ilex L.) coppices: preliminary results

The initial data of a long-term research programme aimed at determining the silvicultural choices for management of ageing helm oak coppices are reported. The various treatments being tested an the following: treatments A and B, respectively, with 50 and 250 reserve trees per hectare, all of the same age; treatment C with 140 reserve trees per hectare, with three different ages; treatment D, conversion into high forest; and treatment E, natural evolution (the control). A total of 15 permanent plots were established (five treatments x three replicates) and the experimental design used is that of randomized blocks. The results presented regard the structural development of the coppice during the first 2 years after coppicing. Regeneration from seed showed a significant correlation with treatment. Data relative to the characteristics of the stands existing before the various interventions also are given. Such preliminary results need further periodical observations. ((C) Inra/Elsevier, Paris.).