Data sets reveal long-term trends as follows:
- A significant decline in soil solution SO4 and S uptake which is consistent with the reduction in S deposition as a result of emissions control policies.
Graph showing soil solution [S04] and foliar [S] content (New window)
- A significant decline in soil solution K+ in the majority of the Level II plots, possibly due to enhanced K leaching and/or uptake in response to management intervention.
Graph showing soil solution [K+] and foliar [K] content (New window)
- Variable NO3 in soil solution, with a distinct increase in NO3 observed in peat soils under Sitka spruce.
Graph showing soil solution [NO3] and foliar [N] content (New window)
- The first signs of recovery from soil acidification at previously polluted sites.
- Soil acidification at a site with high N deposition from local sources.