The issue of biocomplexity, the pattern of processes governing biodiversity vill be studied in an alpine landscape in northern Swedish Lapland, Latnjajaure catchment. The ragged topograhy in combunation with strong winds give rise to extensive snow redistribution. As most of the annual preciptation here falls as snow, most of the atmospheric nitrogen deposition will relocated to snowbeds, wheras neighboring ridges receive a minor fraction of the input. This patchiness in nitrogen supply within the landscape is forecasted to increase as the atmospheric of mainly antropogeneous nitrogen increase exponentially. Snowbeds are by IPCC regarded as particularly vulnerable ecosystem,and our working hypothesis is that increased temperature and nitrogen supply in concert is the major threat. We combine monitoring of nitrogen deposition and measurement of nitrification potential in the soil with manipulation where a nitrogen input according to the forecast for 2050 is applied to selected snowbeds. Dynamic modelling at the landscape level will help us to provide prognoses for the future changes in the alpine tundra.