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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   IMPACT OF TRAFFIC POLLUTION ON PINUS PINEA TREE-RING: δ13C AND δ15N ANALYSIS.

Authors:  CARMINE LUBRITTO, GIOVANNA BATTIPAGLIA, S. ALTIERI, C. SIRINGANO, S. STRUMIA. 		 
       
         
  Abstract:  The increasing amount of nitrogen deposition, in particular of NOx, from fossil fuel combustion has several implications on global biogeochemical cycles. Many Nfertilization experiments showed contrasting results at the plant and stand scale. Consequently, the question arises: did vegetation benefit from this increase of atmospheric [NOx] and how is it possible to detect on long term their eco-physiological effects? The objective of our study was to apply a promising approach to detect possible effects of atmospheric NOx fertilization on Pinus pinea trees, growing close to traffic pollution. Specifically, we examined the time-related trend in the growth residuals through Carbon and Nitrogen isotopic and dendrochronological analysis. The isotopic signatures in tree rings have been used in several studies to assess the long-term records of climatic change or the tree physiological responses to ecological stress factors. Nitrogen is present in tree rings, although in relative low concentration, and the isotopic signature of N isotopes might provide useful information on N cycling processes.  
         
     
         
         
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