Water sources and carbon isotope composition (delta 13C) of selected tree species of the Italian Alps
1994
Valentini, R. (University of Tuscia, Viterbo, Italy.) | Anfodillo, T. | Ehleringer, J.R.
Selected species of the Italian Alpine region (Picea abies (L.) Karst., Pinus sylvestris L., Pinus cembra L., and Larix decidua L.) have been investigated in terms of water-source utilization and carbon fixation estimated by the analysis of hydrogen and carbon stable isotopes composition at two sites of differing altitude (1000 and 1500 m above sea level). Larix decidua is the species most dependent on groundwater in both sites, while Pinus sylvestris utilizes rainwater to a greater extent. Concurrently, Pinus sylvestris displayed the highest value of the carbon isotopic ratio (delta 13C = -25.9 +/- 0.6 per thousand), while Larix decidua had the most negative one (delta 13C = -29.0 +/- 0.4 per thousand). A relationship was found between water-source utilization and carbon-isotope discrimination
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