Maximal load of nitrogen for forest soils; 1 : 2 000 000

The maximum critical load by nitrogen (N) represents the value of the overall nitrogen deposition, which if exceeded causes the damage to forest ecosystem. The balance of nitrogen cycle determines the maximum critical load by nitrogen where deposition, immobilization, denitrification, intake by plants (wood species), and leaching of N into the underground water are the key processes. Concentration of N in soil solution is used as the critical indicator of nitrogen balance in relation to wood species. (author)