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Assessing tree ring delta.sup.15N of four temperate deciduous species as an indicator of N availability using independent long-term records at the Fernow Experimental Forest, WV
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Assessing tree ring delta.sup.15N of four temperate deciduous species as an indicator of N availability using independent long-term records at the Fernow Experimental Forest, WV
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Journal Article
Assessing tree ring delta.sup.15N of four temperate deciduous species as an indicator of N availability using independent long-term records at the Fernow Experimental Forest, WV
2019
Overview
Nitrogen deposition in the northeastern US changed N availability in the latter part of the twentieth century, with potential legacy effects. However, long-term N cycle measurements are scarce. N isotopes in tree rings have been used as an indicator of N availability through time, but there is little verification of whether species differ in the strength of this signal. Using long-term records at the Fernow Experimental Forest in West Virginia, we examined the relationship between soil conditions, including net nitrification rates, and wood [delta].sup.15N in 2014, and tested the strength of correlation between tree ring [delta].sup.15N of four species and stream water NO.sub.3.sup.- loss from 1971 to 2000. Higher soil NO.sub.3.sup.- was weakly associated with higher wood [delta].sup.15N across species, and higher soil net nitrification rates were associated with higher [delta].sup.15N for Quercus rubra only. The [delta].sup.15N of Liriodendron tulipifera and Q. rubra, but neither Fagus grandifolia nor Prunus serotina, was correlated with stream water NO.sub.3.sup.-. L. tulipifera tree ring [delta].sup.15N had a stronger association with stream water NO.sub.3.sup.- than Q. rubra. Overall, we found only limited evidence of a relationship between soil N cycling and tree ring [delta].sup.15N, with a strong correlation between the wood [delta].sup.15N and NO.sub.3.sup.- leaching loss through time for one of four species. Tree species differ in their ability to preserve legacies of N cycling in tree ring [delta].sup.15N, and given the weak relationships between contemporary wood [delta].sup.15N and soil N cycle measurements, caution is warranted when using wood [delta].sup.15N to infer changes in the N cycle.
Publisher
Springer
Subject
