Δ15N

D15N and delta N -15 is a measure of the ratio of the stable nitrogen isotope 15N to 14N in a sample for analysis in geochemistry, paleoclimatology and paleoceanography. It is defined as:

In this study of the 15N isotope content of the sample is compared with the 15N content of a standard, so it the isotopic ratio is determined. In this manner, various aspects of the nitrogen cycle may be examined. They are: The mixture rate of the introduced nitrogen-containing substance with a different content of 15N, and the rate is received or reacted with the nitrogen from the ecosystem. This also attachment or Abreicherungsvorgänge can be made quantifiable.

Nitrogen is a component of the plant metabolism of essential nutrients, which are also produced in the form of nitrogen fertilizer industry, to increase the yield of crops. Nitrogen is used in the form of amino acids of plants and animals for the synthesis of proteins. He passes through the food chain into the bodies of herbivores. Thus it can be examined via the analysis of d15N and nitrogen transfer between plants and animals.

A study conducted in the mountainous region of Kilimanjaro study found, for example, a by climate change and intensive use significantly altered as pasture d15N signature. While this is usually there at 3.5 ‰, values ​​were found from 6.5 ‰ in heavily affected regions.