Northern Research Station, USDA Forest Service, 271 Mast Road, Durham, NH 03824, United States.
Chemosphere. 2014 Jan;95:58-62. doi: 10.1016/j.chemosphere.2013.08.017. Epub 2013 Sep 10.
Energy dispersive X-ray fluorescence (EDXRF) provides highly sensitive and precise spatial resolution of cation content in individual annual growth rings in trees. The sensitivity and precision have prompted successful applications to forensic dendrochemistry and the timing of environmental releases of contaminants. These applications have highlighted the need to distinguish dendrochemical effects of internal processes from environmental contamination. Calcium, potassium, and zinc are three marker cations that illustrate the influence of these processes. We found changes in cation chemistry in tree rings potentially due to biomineralization, development of cracks or checks, heartwood/sapwood differentiation, intra-annual processes, and compartmentalization of infection. Distinguishing internal from external processes that affect dendrochemistry will enhance the value of EDXRF for both physiological and forensic investigations.
能量色散 X 射线荧光（EDXRF）可提供树木中单个年度生长环中阳离子含量的高度敏感和精确的空间分辨率。这种敏感性和精度促使其在法医树轮化学和污染物环境释放时间的成功应用。这些应用突出表明需要区分树木年轮内过程的树轮化学效应与环境污染物。钙、钾和锌是三个说明性的标记阳离子，它们说明了这些过程的影响。我们发现，树木年轮中的阳离子化学变化可能是由于生物矿化、裂缝或检查的发展、心材/边材分化、年内过程以及感染的分隔化引起的。区分影响树轮化学的内部和外部过程将提高 EDXRF 在生理和法医研究中的价值。
