Decadal impacts of nitrogen additions on temperate forest carbon sinks: A data-model comparison | CU Experts

Abstract. To accurately capture the measured impacts of nitrogen (N) on the land carbon (C) sink in Earth system models, model responses to both N limitation and ecosystem N additions (e.g., from atmospheric N deposition and fertilizer) need to be evaluated. The response of the land C sink to N additions depends on the fate of these additions – that is, how much of the added N is lost from the ecosystem through N loss pathways, or recovered and used to increase C storage in plants and soils. Here, we evaluate the C-N dynamics of the latest version of a global land model, the Community Land Model 5 (CLM5). Because the default version of CLM5 overestimated the magnitude of N inputs and losses compared to observations, we configured an adjusted version of CLM5 with more conservative assumptions about these fluxes. We then compared the short- (;

Cheng SJ; Hess PG; Wieder WR; Thomas RQ; Nadelhoffer KJ; Vira J; Lombardozzi DL; Gundersen P; Fernandez IJ; Schleppi P

VIVO