《Table 6–Ecosystem functioning among fifteen species compositions.》

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《Effects of plant diversity on greenhouse gas emissions in microcosms simulating vertical constructed wetlands with high ammonium loading》

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Note:Different letters within columns indicate significant difference by applying“Dunn's test”at P<.05.

In CWs with high NH4+-N loading，plant species richness did not affect N2O emissions（Table 3）.Likewise，Abalos et al.（2014）found that high plant species richness did not affect N2O emissions from grasslands with low N loading.Previous studies have also reported that high plant species richness increased（Chang et al.，2014）or decreased N2O emission（Han et al.，2017），although these experiments were conducted under relatively high NO3--N loading.In this study，high NH4+-N loading may have influenced N2O emissions as well as N concentrations in effluent and plant growth（Britto and Kronzucker 2002；Law et al.，2012），and then impacted the effect of plant species richness on N2O emissions.