Primary Research Article
Growth decline and divergent tree ring isotopic composition (δ13C and δ18O) contradict predictions of CO2 stimulation in high altitudinal forests
Version of Record online: 25 MAR 2013
© 2013 Blackwell Publishing Ltd
Global Change Biology
Volume 19, Issue 6, pages 1748–1758, June 2013
How to Cite
Gómez-Guerrero, A., Silva, L. C. R., Barrera-Reyes, M., Kishchuk, B., Velázquez-Martínez, A., Martínez-Trinidad, T., Plascencia-Escalante, F. O. and Horwath, W. R. (2013), Growth decline and divergent tree ring isotopic composition (δ13C and δ18O) contradict predictions of CO2 stimulation in high altitudinal forests. Global Change Biology, 19: 1748–1758. doi: 10.1111/gcb.12170
- Issue online: 2 MAY 2013
- Version of Record online: 25 MAR 2013
- Accepted manuscript online: 9 FEB 2013 03:10AM EST
- Manuscript Accepted: 30 JAN 2013
- Manuscript Received: 28 NOV 2012
Appendix S1. Average annual basal area increment (BAI) of old (>150; n = 25) and young (<50; n = 11) Pinus hartwegii (Ph) (top panel) and Abies religiosa (Ar) (bottom panel) trees. Old trees are shown in the main panel and young trees in the top left panel, where lines represent a second order fitted curve. Equations for young trees are: Pinus y = −0.1336x2 + 531.21x – 527920 R2 = 0.72; Abies y = −0.0429x2 + 171.08x − 170 491 R2 = 0.37.
Appendix S2. Correlation between estimated source to product fractionation (∆13C) and tree ring δ18O at all study sites. Only Abies religiosa (Ar) trees at the Nevado de Toluca (NT) site (Fig. 1), the relationship between these variables was significant.
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