Figure Legends
Fig. 1 Influence of addition with different types of N
fertilizers on soil total microbial biomass.
Effect sizes are natural log response ratios (lnRR ), with
positive and negative values indicating a positive and negative effect
of N addition respectively. Points represent means (lnRR ) and
error bars present 95 % confidence intervals (CI). The number in
parentheses next to the bar represents the number of observations. The
same below.
Fig. 2 Influence of addition with different types of N
fertilizers on soil microbial characteristics.
A , Fungal biomass; B , Bacterial biomass; C ,
Fungi to bacteria (F/B) ratio; D , Actinomycete biomass;E , Saprophytic fungal biomass; F , Arbuscular
mycorrhizal (AM) fungal biomass; G , Gram-positive
(G+) bacterial biomass; H , Gram-negative
(G−) bacterial biomass; I ,
G+/G− ratio.
The details of the analysis were shown in Supplementary Online
Material 6 .
Fig. 3 Relationship between the changes of microbial
characteristics (lnRR ) and accumulated N amount (N addition rate
× application duration).
A , NH4+-N; B ,
NO3−-N; C ,
NH4NO3; D ,
CO(NH2)2