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This paper presents detailed data on the biomass and element pools of six sample trees in the catchments of Plešné andČertovoLakes. Diameters and heights of the sample trees ranged from 28.0 to 63.7 cm and from 14.1 to 38.7 m. The age of the sample trees ranged from 84 to 177 years. Total biomass of the sample trees was in the range of 239.4 kg to 2,932.3 kg. Variation of total biomass between the sample trees was a consequence of the tree biometric data (height and dbh) and age differences. The proportion of stem wood and bark ranged from 63.5 to 69.5%, and from 4.6 to 7.2%, respectively. The proportion of foliage and fine branches ranged from 4.3 to 8.4%, and from 0.7 to 1.9%, respectively. The proportion of branch wood and bark ranged from 2.2 to 6.5%, and from 0.8 to 2.2%, respectively. Mean concentrations of C in different tree components were quite similar. Except C and compared to the other elements, N had the highest mean concentrations in tree components in all cases. Concentrations of P, Ca, Mg, and K showed similar patterns. Generally the highest concentrations of these elements were found in foliage, fine branches, fine roots and bark of stem and branches. Fe, Na, Al and Mn showed the lowest mean concentrations in tree components for all the analyzed elements. The total element pools per tree were highly variable because of the differences in total biomass between the individual trees. Generally, stem wood and bark, foliage, and roots contained the highest proportion of the elements. But there were differences between individual elements. Concerning the important nutrients, while the highest proportion of Ca and Mg was contained in stem wood and bark, the highest proportion of P was contained in foliage. The foliage contained a relatively high proportion of P and K, but a relatively low proportion of Ca and Mg.

Abstract: We reconstructed the history of terrestrial export of aluminium (Al) to Plešné Lake (Czech Republic) since the lake origin ∼12,600year BC, and predicted Al export for 2010–2050 on the basis of previously published and new data on mass budget studies, palaeolimnological data, and MAGIC modelling. We focused on three major Al forms; ionic Al (Ali), organically-bound Al (Alo), and particulate Al hydroxide [Al(OH)3]. In early post-glacial time, Plešné Lake received high terrestrial export of Al, but with a minor proportion of Al(OH)3 (4–25μM), and concentrations of Ali and Alo were negligible. Since the forest and soil development (∼9900–9000year BC), erosion has declined and soil organic acids increased export of Alo from soils. The terrestrial Alo leaching (∼7.5μM) persisted throughout the Holocene until the industrial period. Then, Ali concentrations continuously increased (up to 28μM in the mid-1980s) due to atmospheric acidification; the Ali leaching was mostly associated with sulphate. The proportion of Ali associated with nitrate has been increasing since the beginning of lake recovery from acidification after ∼1990 due to reduction in sulphur deposition and nitrogen-saturation of the catchment, leading to persistent nitrate leaching. Currently, nitrate has become the dominant strong acid anion and the major Ali carrier. Alo (5.5μM) is predicted to dominate Al concentrations around 2050, but the predicted Ali concentrations (∼4μM) are uncertain because of uncertainty associated with the future nitrate leaching and its effect on soils. [Copyright &y& Elsevier]