Repeated nitrogen fertilization enhances Scots pine growth and carbon uptake without persistent long-term effects in boreal forests.

While a decline in δ 13 C values in the control during the 1990s was evident in the decadal δ 13 C treatment effect, this variation between decadal means did not reach statistical significance ( Figure 8d : δ 13 C EW treatment effect ANOVA F 3,0.2 = 0.28, P = 0.837; Figure 8f : δ 13 C LW treatment effect ANOVA F 3,0.3 = 0.54, P = 0.665).

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