Potential for assessing long-term dynamics in soil nitrogen availability from variations in δ15N of tree rings

Numerous researchers have used the isotopic signatures of C, H, and O in tree rings to provide a long-term record of changes in the physiological status, climate, or water-source use of trees. The frequently limiting element N is also found in tree rings, and variation in its isotopic signature may provide insight into long-term changes in soil N availability of a site. However, research has suggested that N is readily translocated among tree rings of different years; such infidelity between the isotopic compositions of the N taken up from the soil and the N contained in the ring of that growth year would obscure the long-term N isotopic record. We used a 15-year N-15-tracer study to assess the degree of N translocation among tree rings in ponderosa pine (Pinus ponderosa) trees growing in a'young, mixed-conifer plantation. We also measured delta(13)C and delta(15)N values in unlabeled trees to assess the degree of their covariance in wood tissue, and to explore the potential for a biological linkage between them. We found that the maximum delta(15)N values in rings from the labeled trees occurred in the ring formed one-year after the N-15 was applied to the roots. The delta(15)N value of rings from labeled trees declined exponentially and'bidirectionally from this maximum peak, toward younger and older rings. The unlabeled trees showed considerable interannual variation in the delta 15 N values of their rings (up to 3 and 5parts per thousand), but these values correlated poorly between trees over time and differed by as much as 6parts per thousand. Removal of extractives from the wood reduced their delta(15)N value, but the change was fairly small and consistent among unlabeled trees. The delta(13)C and delta(15)N values of tree rings were correlated over time in only one of the unlabeled trees. Across all trees, both delta(13)C values of tree rings and annual stem wood production were well correlated with annual precipitation, suggesting that soil water balance is an important environmental factor controlling both net C gain and transpirational water loss at this site. Our results suggest that interannual translocation of N among tree rings is substantial, but may be predictable enough to remove this source of variation from the tree-ring record, potentially allowing the assessment of long-term changes in soil N availability of a site.