| dc.creator |
Buntrock, Laura |
|
| dc.creator |
Thomas, Valerie A. |
|
| dc.creator |
Strahm, Brian D. |
|
| dc.creator |
Fox, Tom |
|
| dc.creator |
Harrison, Robert |
|
| dc.creator |
Himes, Austin |
|
| dc.creator |
Littke, Kim |
|
| dc.date |
2022-10-26T19:27:29Z |
|
| dc.date |
2022-10-26T19:27:29Z |
|
| dc.date |
2022-10-15 |
|
| dc.date |
2022-10-26T11:07:46Z |
|
| dc.date.accessioned |
2023-03-01T18:52:01Z |
|
| dc.date.available |
2023-03-01T18:52:01Z |
|
| dc.identifier |
Buntrock, L.; Thomas, V.A.; Strahm, B.D.; Fox, T.; Harrison, R.; Himes, A.; Littke, K. Patterns in Foliar Isotopic Nitrogen, Percent Nitrogen, and Site Index for Managed Forest Systems in the United States. Forests 2022, 13, 1694. |
|
| dc.identifier |
http://hdl.handle.net/10919/112289 |
|
| dc.identifier |
https://doi.org/10.3390/f13101694 |
|
| dc.identifier.uri |
http://localhost:8080/xmlui/handle/CUHPOERS/281574 |
|
| dc.description |
Patterns in foliar nitrogen (N) stable isotope ratios (δ<sup>15</sup>N) have been shown to reveal trends in terrestrial N cycles, including the identification of ecosystems where N deficiencies limit forest ecosystem productivity. However, there is a gap in our understanding of within-species variation and species-level response to environmental gradients or forest management. Our objective is to examine the relationship between site index, foliar %N, foliar δ<sup>15</sup>N and spectral reflectance for managed Douglas-fir (<i>Pseudotsuga menziesii</i>) and loblolly pine (<i>Pinus taeda</i>) plantations across their geographic ranges in the Pacific Northwest and the southeastern United States, respectively. Foliage was measured at 28 sites for reflectance using a handheld spectroradiometer, and further analyzed for δ<sup>15</sup>N and N concentration. Unlike the prior work for grasslands and shrubland species, our results show that foliar δ<sup>15</sup>N and foliar %N are not well correlated for these tree species. However, multiple linear regression models suggest a strong predictive ability of spectroscopy data to quantify foliar δ<sup>15</sup>N, with some models explaining more than 65% of the variance in the δ<sup>15</sup>N. Additionally, moderate to strong explanations of variance were found between site index and foliar δ<sup>15</sup>N (<i>R</i><sup>2</sup> = 0.49) and reflectance and site index (<i>R</i><sup>2</sup> = 0.84) in the Douglas-fir data set. The development of relationships between foliar spectral reflectance, δ<sup>15</sup>N and measures of site productivity provides the first step toward mapping canopy δ<sup>15</sup>N for these managed forests with remote sensing. |
|
| dc.description |
Published version |
|
| dc.format |
application/pdf |
|
| dc.format |
application/pdf |
|
| dc.language |
en |
|
| dc.publisher |
MDPI |
|
| dc.rights |
Creative Commons Attribution 4.0 International |
|
| dc.rights |
http://creativecommons.org/licenses/by/4.0/ |
|
| dc.title |
Patterns in Foliar Isotopic Nitrogen, Percent Nitrogen, and Site Index for Managed Forest Systems in the United States |
|
| dc.title |
Forests |
|
| dc.type |
Article - Refereed |
|
| dc.type |
Text |
|