The effects of N deposition on carbon sequestration in temperate forest soils
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Ginzburg, Shimon1, Forfatter
Gundersen, Per1, Vejleder
1Det Biovidenskabelige Fakultet, København, Danmark
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 Abstract: N deposition in many forest ecosystems in Europe exceeds critical loads. The impact of elevated nitrogen (N) deposition on carbon (C) sequestration in forests is under debate and varies from 5-225 kg C per kg N added. In this study, forest edges in Denmark and Belgium were used to estimate the effect of high, intermediate and low N deposition rates on C sequestration in the soil. The hypotheses tested were (i) that intermediate, long-term N deposition in temperate forests retards the decomposition of soil organic matter (SOM) and leads to C accumulation in the forest soil and (ii) that under N saturated conditions the soil loses its capacity to sequester C. The results show that the effects N deposition had on C accumulation in the forest soils varied from positive to negative and were site specific. Possible factors that can be responsible for the varied response of soil C to N deposition are the N deposition rate, degree of N saturation (initial C/N), C input from microbial biomass and microclimate. However, there was more evidence that under N saturated conditions the soil loses its capacity to sequester C. This was evident in the lack of response of the mineral soil layers in most sites to excess N input. Moreover, in the organic layer (LFH), sites with soil C/N ratio below 28 exhibited a significant relationship to soil C content compared with sites with high soil C/N ratios. In the former sites, increase in C/N ratio was associated with a significant increase in C content. For instance, fine OM accumulation in the LFH layer in Vloethemveld increased sharply from 14 tonnes C ha-1 at C/N ratio 22.5 to 34 tonnes C ha-1 at C/N ratio of 28. Overall, the C/N ratio turns out to be more important for C accumulation than the N deposition in sites characterized by low soil C/N ratios. It is important to account for forest edge effects on N deposition and soil C and N budgets in forest management plans as well as in calculations of critical loads.
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 Type: Speciale
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Sprog: English - eng
 Datoer: 2010
 Sider: 60 pages
 Publiceringsinfo: København, Danmark : Skov & Landskab
 Indholdsfortegnelse: -
 Note: Agricultural Science, Agronom
 Type: Speciale
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