ELECTRONIC SUPPLEMENTARY MATERIAL
Regression relationship between potential ammonia oxidation rate and AOA/AOB abundance
According to the heterogeneous characteristics of potential ammonia oxidation rate and the abundances of AOA
and AOB determined in the plant-bed/ditch system, the regression analysis between potential ammonia oxidation rate
and the log number of AOA or AOB abundance was carried out. The results showed that potential ammonia oxidation
rate was significantly dominated by AOB abundance both in the plant-bed soils (p=0.002, R2=0.464) and in the ditch
sediments (p=0.0002, R2=0.761). However, there was no such significant relationship between potential ammonia
oxidation rate and AOA abundance (Table S1).
Table S1 The regression equations between potential ammonia oxidation rate and AOA/AOB abundance in the
plant-bed/ditch system
Plant-bed soil
Ditch sediment
Function
R2
p
Ammonia oxidation rate = -1.98 + 1.55 × Log(AOA)
0.013
0.659
Ammonia oxidation rate = -97.4 + 14.6 × Log(AOB)
0.464
0.002
Ammonia oxidation rate = -765.6 + 123.9 × Log(AOA)
0.096
0.328
Ammonia oxidation rate = -3091.1 + 424.8 × Log(AOB)
0.761
0.0002