Soil microbiom: Both climate change and land use/management changes alter biogeochemical cycles of C, N and P with potentially adverse effects on key soil functions of grassland ecosystems in pre-alpine and alpine regions. Our investigations of N and P turnover processes indicated the interaction of climate change and land use intensity has the power to change the relations of N and P turnover processes.
Regarding P turnover, it seems that the abundance of most functional genes decreased under high climate change and extensive management. However, based on the enzyme measurements it turned out that the remaining microbes involved in the use of organic P are highly active under intensive management with increasing climate change and thus a risk of a decrease of the organic P pool exists (Fig. 1).
Regarding N turnover, it became apparent that fertilization increased nitrification potential under climate change conditions, while under extensive management nitrogen fixation compensated lower nitrogen inputs. The mesocosms without climate change treatments revealed the opposite pattern. There, the potential to convert fertilized nitrogen to nitrate was lower (Fig. 2).