In 1960ies and 1970ies, fertilization indeed played an important role in Finland in enhancing timber production by increasing forest growth especially in upland area (Kukkola and Nojd 2000). Nitrogen addition to forests may also affect the pool of soil organic carbon as enhanced growth in foliage and leaf area result in increased litterfall (Hyvonen et al. Johnsson and Curtis (2001) showed that fertilization indeed increase soil carbon storage.