The average critical load for nitrogen deposition in the Netherlands is lower than previously assumed, according to new research by Wageningen Environmental Research, the Netherlands Environmental Assessment Agency and Research Centre B-WARE. The value that indicates how much nitrogen nature can tolerate without decline has decreased by an average of 1.3 kilograms per hectare per year. This means that nitrogen emissions need to be reduced even further to protect nature.
sensitive nature types. While the critical load remains unchanged for some nature types it has significantly decreased for others.
These experiments provide a minimum and maximum value for nitrogen deposition, known as the empirical range. This range provides deposition values for all of Europe, accounting for differences in conditions such as soil and climate. These values also serve as the basis for the Dutch critical load. The international research with new empirical values led to the update of the CLs for the Netherlands, yielding the same result: some nature is more sensitive to nitrogen than previously thought.
For almost all nature types where something has changed, the values for nitrogen deposition have decreased. According to Wamelink, this means that achieving the nitrogen goals will be more challenging. The modeled CL falls within the empirical range, then the Dutch CL is equal to the modeled value. For example, for Inland dunes, the range is 5-15 kg/ha/yr., and the modeling is 10.4 kg/ha/yr. The Dutch CL is then rounded to 10 kg/ha/yr.
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