A 6-Year-Long Manipulation with Soil Warming and Canopy Nitrogen Additions does not Affect Xylem Phenology and Cell Production of Mature Black Spruce.

Differences between Years Years had highly significant effects on xylem phenology and cell production ( P < 0.001) and significant effects of the interactions between site and years were also observed for the onset of wall thickening, the mature cell and cell production ( P < 0.05) ( Table 2 ).

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