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11 páginas, 5 figuras. 1 tablaMost nutrient-spiraling studies have focused on estimates of gross uptake (Ugross), which show that streams\udtake up dissolved inorganic nutrients very efficiently. However, studies based on estimates of net uptake (Unet) emphasize\udthat streams tend to be at biogeochemical steady state (i.e., Unet ≈ 0), at least on a time scale of hours. These\udfindings suggest that streams can be highly reactive ecosystems but remain at short-term biogeochemical steady state\udif Ugross is counterbalanced by release (R), a process that remains widely unexplored. Here, we propose a novel approach\udto infer R by comparing Unet and Ugross estimated from ambient and plateau concentrations obtained from\udstandard short-term nutrient additions along a reach. We used this approach to examine the temporal variation of\udR and its balance with Ugross in 2 streams with contrasting hydrological regime (i.e., perennial vs intermittent) during\ud2 years. We focused on the spiraling metrics of NH4\ud+ and soluble reactive P (SRP), essential sources of N and P in\udstream ecosystems. R differed substantially between the 2 streams. The perennial stream had a higher proportion of\uddates with R > 0 and a 2× higher mean R than the intermittent stream for both nutrients. Despite these differences,\udthe magnitude of R and Ugross tended to be similar for both nutrients within each stream, which lead to Unet ≈ 0 in\udmost cases. A notable exception occurred for SRP in the intermittent stream, where R tended to be higher than Ugross\udduring most of the winter period, probably because of desorption of P from stream sediments. Together, our findings\udshed light on the contribution of release processes to the dynamics of nutrient spiraling and support the idea that\udstreams can be active ecosystems with high spiraling fluxes while simultaneously approaching short-term biogeochemical\udsteady-state.Financial support was provided by the\udEuropean Union-funded projects EURO-LIMPACS (GOCE-CT-\ud2003-505540) and REFRESH (FP7-ENV-2009-1-244121) and the\udMINECO-funded projects SCARCE-Consolider (CSD 2009-00065),\udMONTES-Consolider (CSD 2008-00040), and MED_FORESTREAM\ud(CGL2011-30590).Peer reviewe

A round-trip ticket: the importance of release processes for in-stream nutrient spiraling