Fig. 6
![Fig. 6](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13717-022-00376-y/MediaObjects/13717_2022_376_Fig6_HTML.png)
Redundancy analysis (RDA) of community biomass and diversity (blue lines) in relation to environmental factors (red lines) under N or P addition. In Fig. 5a, RDA axes 1 and 2 explained 54.32% and 24.46% of the variation, respectively (adjusted R2 = 74.9%, F = 14.6, P < 0.05). In Fig. 5b, RDA axes 1 and 2 explained 45.53% and 34.81% of the variation, respectively (adjusted R2 = 79.5%, F = 14.6, P < 0.05)