Changes in stemwood calcium concentration ([Ca]) for the last 120 years occurred in a common pattern for two sample collections of red spruce (n
= 33 and 20) from the northeastern United States and for one sample collection of Siberian fir (n
= 20) from southcentral Siberia, Russia. The [Ca]was measured for wood formed during the periods 1871-90, 1891-1910, 1911-30, 1931-50, 1951-70 and 1971-90. For each core, the relative increase or decrease in [Ca] for adjacent periods of wood formation was recorded. The relative frequency of positive change in [Ca] for each period of wood formation was calculated for the three sample collections.
Shortle, W.C.; Smith, K.T.; Minocha, R.; Alexeyev, V.A. 1995. Similar patterns of change in stemwood calcium concentration in red spruce and Siberian fir. Journal of Biogeography. 22: 467-473.