Nitrogen Supply and Forest Productivity in a Landscape Perspective Hypotheses

Nitrogen Supply and Forest Productivity in a Landscape Perspective Hypotheses 

TABLE 1 Theoretical N Balance over a Period of 100 Years in a Discharge Area and Its Associated Recharge Area in Boreal Forest in Northern Sweden  

Another category of explanations (Fig. 3) refers to in situ processes in the groundwater discharge areas. This category of explanations of the higher N supply in discharge areas includes (Tamm, 1991 Chapin efn/., 1988 Giesler etu/., 1998)  

conditions more conducive for N2-fixation, at present or earlier in site history, 

higher rates of autotrophic nitrification because of higher soil pH, 

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