A national network of comparative trials for testing French Douglas-fir seed orchards

Abstract

The recent release of six new Douglas fir seed orchard varieties has motivated the establishment of a network of comparative plantations including the eight French Douglas fir orchards. It aims at studying improved variety plasticity and performances (growth, form) in comparison with a control from the natural range. Altogether, 27 evaluation and demonstration projects were planted between 2009 and 2011 at a large range of sites: regions where Douglas fir is widely cultivated, altitude zones and "climatic margins". This network will enable the partners (Cemagref, ONF, INRA, CNPF) to provide reforestation workers with recommendations. Useful information has already been obtained for lateness of bud flushing and, therefore on the sensitivity to spring frost damage.