Bergholm, Johan
- Institutionen för ekologi och miljövård, Sveriges lantbruksuniversitet
Sammanfattning
This thesis describes the long-term effects of enhanced inputs of ammonium and sulphate (NS) in a spruce stand in SW Sweden on the accumulation and fluxes of nutrients in above and below ground biomass, soil chemistry and leaching of nutrients. Ammonium and sulphate were added annually at a rate of 100 kg N and 114 kg kg S ha'1, which was five to six times higher than the deposition rate of the study area. The main nutrients studied were N, P, K, Ca, Mg and S. Other important parameters were pH, NH4, N 0 3 and A1 in soil, soil solution and deposition.The addition of NS decreased the pH in the mineral soil by 0.4 units and in the soil solution by 0.3 units. The increased acidity of the soil was almost totally buffered by dissolution of solid aluminium compounds (gibbsite). The input of inorganic nitrogen by deposition was totally retained in the ecosystem, as the stand was unsaturated with respect to nitrogen. The high additional input of nitrogen soon turned the stand into a nitrogensaturated system. About 40% of the Mg was leached from the humus layer. The NS treatment increased the leaching of all nutrients except P and K from the root zone and the water soluble concentrations of all nutrients except NH4 and S04 increased in the rhizosphere soil. The amount of fine roots (
Nyckelord
acid deposition; ammonium; sulphate; base cations; biomass; fine roots; macro nutrients; soil acidification
Publicerad i
Acta Universitatis Agriculturae Sueciae. Silvestria
2001, nummer: 215
Utgivare: Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences
SLU författare
UKÄ forskningsämne
Livsmedelsvetenskap
Markvetenskap
Publikationens identifierare
- ISBN: 91-576-6099-9
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/107995