Airborne Nitrogen Input at Four Locations in the German State of Saxony-Anhalt - Measurements using the 15N-Based ITNI-System |
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Authors: | F Böhme R Russow H-U Neue |
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Institution: | 1. UFZ Centre for Environmental Research Leipzig-Halle, Department of Soil Sciences , Halle, Germany;2. UFZ Centre for Environmental Research Leipzig-Halle, Department of Soil Sciences , Theodor-Lieser-Str. 4, D-06120, Halle, Germany E-mail: boehme@bdf.ufz.de;3. UFZ Centre for Environmental Research Leipzig-Halle, Department of Soil Sciences , Halle, Germany |
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Abstract: | Abstract The amount of atmospheric N deposition in Germany is actual rather uncertain. Estimates using standard methods indicate an N deposition of 30–35 kg N/ha × year. However, the results of long-term field experiments and newly by the ITNI (Integrated Total Nitrogen Input) system could prove a much higher N input of about 50–60 kg N/ha × year. The reason for this difference is that standard methods use wet-only or bulk collectors, which neglect gaseous and organic N deposition as well as direct N uptake by aerial plant parts. By contrast, the ITNI-system is able to measure the total atmospheric N input using the 15N isotope dilution method. The input of airborne N into a soil/plant system leads to a dilution of the abundance of a previously applied 15N tracer over a defined time period. The atmospheric N deposition can be calculated from this dilution. To estimate the actual N input in Central Germany, ITNI measurements were carried out from autumn 1998 to autumn 2000 at four locations in the German state of Saxony-Anhalt. Atmospheric N depositions between 45 and 75 kg N/ha × year were determined depending on the location. These results closely match to N balances of longterm field experiments. Furthermore, a relationship was found between N deposition and the plant species used as well as plant development. |
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Keywords: | Airborne nitrogen atmospheric deposition fertilization nitrogen nitrogen 15 soil/plant system tracer technique |
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