Feedback of litter decay to temporal stability of biomass under N‐inputs

Nitrogen (N) input affects litter decay and ecosystem functioning. However, the mechanism of litter decay under temporal N‐inputs has rarely been observed. Here we show that three‐year experimental N‐inputs significantly stimulated the rate of litter decay to some extent and then inhibited it with increasing N‐inputs. The N‐inputs affected the litter's mass loss by directly influencing the temporal stability of aboveground biomass (BS) and diversity while indirectly changing soil pH, C: N ratio, and synergistic interactions of soil, vegetation, and microbial traits. The BS has emerged as a significant regulatory factor for the litter decay of tropical grassland. The outcome of the present study will be helpful in predicting the global feedback of litter decay on the N inputs and the amount of N required for the sustainable functioning of the degraded tropical or similar grasslands.