*, **, and *** indicate significant differences at P <
0.05, P < 0.01, and P < 0.001
respectively.
ANOVA was used to compere the effects of different N application on soil
microbial biomass under different ecosystems and multiple comparisons
were performed using the LSD method. The small letters in rows are the
comparison of the effects of different N types on soil microbial biomass
for each ecotype; the capital letters in columns are the comparison of
soil microbial biomass in different ecotypes for each N type.
The same letter means no statistically significant difference among the
treatments under the level of P < 0.05.
The details were shown in Supplemental Information 7 .