| Legume biomass | Species number | Above-ground biomass | litter | Total coverage | N2O |
Y | 0.1 | 0.5 | 7.8** | 22.5*** | 2.95 | 0.2 |
M | 1.1 | 0.5 | 4.2** | 2.25 | 1.1 | 4.97*** |
Y*M | 0.7 | 0.5 | 0.4 | 0.2 | 0.7 | 0.23 |