Interactions with successional stage and nutrient status determines the life-form-specific effects of increased soil temperature on boreal forest floor vegetation.

However, the GAMM for warmed nonfertilized plots showed a significant trend with an increase in cover after 3–4 years, a trend that was absent in nonwarmed plots (Fig. 2A and B).

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There was a significant interaction between warming and time, and a decreasing trend over time in nonfertilized plots, on species richness according to the GLMM (Table 2 ; Fig. 3A and B).

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vitis-idaea (corr = −0.227; P = 0.052), although the last-mentioned was only borderline significant.

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Warming resulted in near-significant negative effects on the bryophytes in nonfertilized plots (Table 2 ).

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