@article {1000,
	title = {Radiocarbon analysis confirms the annual nature of sagebrush growth rings},
	journal = {Radiocarbon},
	volume = {49},
	year = {2007},
	note = {258usTimes Cited:9Cited References Count:48},
	pages = {1231-1240},
	abstract = {In the Great Basin of North America, big sagebrush (Artemisia tridentata Nutt.) growth rings can be used to reconstruct environmental changes with annual resolution in areas where there is otherwise little such information available. We tested the annual nature of big sagebrush wood layers using accelerator mass spectrometry (AMS) radiocarbon dating. Four cross-sections from 3 sagebrush plants were collected near Ely, Nevada, USA, and analyzed using dendrochronological methods. Ten C-14 measurements were then used to trace the location of the 1963-64 "bomb spike." Although the number of rings on each section did not exceed 60, crossdating was possible within a section and between sections. Years assigned to individual wood layers by means of crossdating aligned with their expected C-14 values, matching the location of the C-14 peak. This result confirmed the annual nature of growth rings formed by big sagebrush, and will facilitate the development of spatially explicit, well-replicated proxy records of environmental change, such as wildfire regimes, in Great Basin valleys.},
	issn = {0033-8222},
	url = {https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3015/2773},
	author = {Biondi, F. and Strachan, S. D. J. and Mensing, S. and Piovesan, G.}
}
@article {1001,
	title = {Radiocarbon analysis of Pinus lagunae tree rings: Implications for tropical dendrochronology},
	journal = {Radiocarbon},
	volume = {41},
	year = {1999},
	note = {289tcTimes Cited:16Cited References Count:31},
	pages = {241-249},
	abstract = {A promising species for tropical dendrochronology is Pinus lagunae, a pine tree found in Baja California Sur (Mexico) around lat 23.5 degrees N. In 1995, we sampled a total of 27 wood cores from 13 Pinus lagunae trees in Sierra La Victoria (23 degrees 36{\textquoteright}N, 109 degrees 56{\textquoteright}W),just north of Sierra La Laguna, at an elevation of 1500-1600 m. Selected trees were locally dominant, but their ring-width patterns could not be crossdated. To test the hypothesis that visible growth layers in Pinus lagunae are formed annually, we measured radiocarbon amounts in individual rings by means of accelerator mass spectrometry (AMS). Twenty-three C-14 measurements were used to trace the location of the 1963-64 "bomb spike" in 3 wood increment cores. By comparing the location of that Delta(14)C extreme with the number of visible radial wood increments, it was possible to conclude that 2 cores had a number of locally absent rings, while the 3rd one included a few years with more than one growth layer. Therefore, ring-width patterns of sampled Pinus lagunae were not consistent from one tree to another, most likely because of climatic regime in combination with microsite features. While the possibility of generating Pinus lagunae tree-ring chronologies cannot entirely be ruled out, the development of dendrochronological proxy records of climate from coniferous species in tropical North America should focus on species and sites that experience a more pronounced seasonality.},
	issn = {0033-8222},
	url = {https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3814},
	author = {Biondi, F.}
}
