Dissolved Available Inorganic Nitrogen

Application of<5 N values to identify organic matter sources is founded on the difference between the N/ N ratios of the inorganic nitrogen reservoirs available to plants in water and those on land. The <5 N value of dissolved N03 , which is the most common... 

Photolytic degradation of dissolved organic nitrogen and phosphorus compounds release inorganic nutrient compounds such as nitrite, ammonia, and phosphate, as well as CO and CO2 [e.g., review of 41,45-47]. Stimulatory effects of increase nutrient availability by such processes clearly occurs [e.g., 47]. 

Until recently, understanding of the effects of acidic deposition on soils was limited. However, current research has shown that acidic deposition has chemically altered forest soils with serious consequences for acid-sensitive ecosystems. Soils compromised by acidic deposition lose their ability to neutralize continuing inputs of strong acids, provide poorer growing conditions for plants, and extend the time needed for ecosystems to recover from acidic deposition. Acidic deposition has altered and continues to alter base-poor forest soils in three important ways. Acidic deposition depletes available calcium and other nutrient cations (e.g., magnesium, potassium) from soil facilitates the mobilization of dissolved inorganic aluminum into soil water and increases the accumulation of sulfur and nitrogen in soil. 

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