Summary 1. Nitrogen (N) deposition can enhance carbon (C) capture and storage in northern coniferous forests but it may also enhance the demand for phosphorus (P). While it is well established that long-term N enrichment can decrease decomposition and enhance the accumulation of C in soils, it remains uncertain if a higher demand and acquisition of P influence soil C. 2. We studied microbial phosphorus mobilization and growth within a long-term N enrichment experiment in a Norway spruce forest, where N deposition was simulated by adding 0, 12.5, or 50 kg N ha-1 yr-1 for 21 yrs (n=12), by incubating microbial ingrowth cores with needles and humus with low and high P content, and with sand with and without mineral apatite P. 3. Long-term N enrichment had no effect on microbial P mobilization in needles and humus and did not enhance the positive effect that apatite had on fungal growth. However, it consistently strengthened the retention of C in the soil by decreasing decomposition of needle and humus, both with low and high P content, and by increasing fungal growth in sand-filled ingrowth cores. Further, we did not find any evidence that higher microbial P mobilization in response to N enrichment affected soil C storage. 4. These results show that long-term N enrichment in relatively young soils dominated by coniferous trees and ectomycorrhizal fungi can have relatively small impact on microbial P mobilization from organic sources and on the potential to mobilize P from minerals, and subsequently that elevated P demand due to N enrichment is unlikely to lead to a reduction in the soil C accumulation rate.
Ergosterol concentration and loss on ignition of sand ingrowth cores with and without apatite amendment incubated for one year in each of the nitrogen treatments at the Svartberget long-term nitrogen deposition simulation experiment.
Mass-loss of phosphorus, nitrogen, and carbon from needles and humus incubated for 1 year in each of the nitrogen addition treatments at the Svartberget nitrogen deposition simulation experiment.