Linkages between environmental factors and fungal functional gene
composition
The increase of winter soil temperature and associated changes of soil
hydrologic conditions (including soil moisture and thaw depth) and GPP
in the growing season significantly contributed to the differences of
functional gene composition (CCA model: F = 1.57, P = 0.01) (Fig.
3a). Those factors explained 47.25% of the differences, among which
winter soil temperature explained 10.35%, soil hydrologic conditions
explained 20.10%, and GPP explained 12.48% (VPA, Fig. 3b).
Linkages between fungal C degradation genes and
R eco
In line with the third hypothesis,R eco had positively linear regressions with the
relative abundances of fungal C degradation genes encoding xylose
reductase (R 2 = 0.56, P <
0.01), vanillin dehydrogenase (R 2 = 0.44,P = 0.02), glyoxal oxidase (R 2 = 0.32,P = 0.03), and aspartate protease (R 2 =
0.33, P = 0.03) (Fig. 4).