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- W4239382029 abstract "To assess the relationship between the regenerative potential of black spruce (Picea mariana (Mill.) BSP) and the latitudinal and thermal gradients, the cone crop was monitored in the same selection of trees during the 1989-1995 period in the northern boreal forest (sites A, n = 49, and B, n = 48), in the southern forest-tundra transition zone (site C, n = 35), and at the tree line (site D, n = 21). The size of the cone crop, the amount of seeds extracted per cone, along with the percentages of filled seed and germination were measured on each tree. There was no south to north trend associated with the cone crop. The cone crop at tree line was not significantly lower than in either of the southerly sites in six of the seven observed years. The number of seeds extracted per cone, the percentage of filled seeds, and the germination of filled seeds showed significant decrease northward according to year. Although there was no significant relationship between temperature and the cone production over the study area, the percentages of filled seeds and germination were significantly (0.51 [Formula: see text] r 2 [Formula: see text] 0.44; p < 0.001) associated with the regional variation in heat sum." @default.
- W4239382029 created "2022-05-12" @default.
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- W4239382029 date "2000-06-01" @default.
- W4239382029 modified "2023-10-04" @default.
- W4239382029 title "Spatiotemporal variation in black spruce cone and seed crops along a boreal forest - tree line transect" @default.
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- W4239382029 doi "https://doi.org/10.1139/x00-015" @default.
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