1. 6

5. Is difference because they are re-created soils or is it due to N deposition?
What’s happening in the undisturbed forests?

6. + fertilization growth response of trees

7. Relationships between abundance of microbial communities and soil chemical characteristics and atmospheric deposition

9. Questions Has there been a fundamental change in:
dominant N forms in soil
process rates of N cycling in soils
soil microbial N-cycling community esp. nitrifiers
foliar N:nutrient ratios esp. N:P
may be early signs of N saturation with attendant implications for tree health