Response of Douglas fir provenances to spring and autumn frost in Austria
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These trials were established between 1973 and 1993 by the Austrian Research Centre for Forests BFW across a wide spectrum of site conditions (Fig. 1). The provenance trials were designed as randomized blocks. Within each block (replication) three to four-year-old pre-cultivated seedlings of selected provenances were planted in plots of 20-100 individuals with a spacing of 2m x 2m. The number of alive and dead trees /seedlings was recorded for each trial in ages between 3 and 10 years before any management measures were implemented
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2018-06-21
