Growth potentials of fifteen provenances of white spruce from Canada, tested in Maryland
Tóm tắt
Fifteen provenances of white spruce (Picea glauca var.glauca) from Canada were studied in Western Maryland (elevation 2,800 feet). The experiment was replicated in 20 blocks. Five years after planting the survival was 99.3%. Two most northern provenances (48° N. or more) were the slowest growing. The most rapidly growing progeny originated from Denbigh in southeastern Ontario. All other provenances west of this point showed a decreasing growth in height with increasing western longitude. A similar pattern of decreasing height growth potential from the east to the west was among the provenances from southern Quebec.
Tài liệu tham khảo
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