Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

[Text] / M. V. Skomarkova [et al.] // Trees-Struct. Funct. - 2006. - Vol. 20, Is. 5. - P571-586, DOI 10.1007/s00468-006-0072-4. - Cited References: 55 . - 16. - ISSN 0931-1890РУБ Forestry

Аннотация: We investigated the variability of tree-ring width, wood density and C-13/C-12 in beech tree rings (Fagus sylvatica L.), and analyzed the influence of climatic variables and carbohydrate storage on these parameters. Wood cores were taken from dominant beech trees in three stands in Germany and Italy. We used densitometry to obtain density profiles of tree rings and laser-ablation-combustion-GC-IRMS to estimate carbon isotope composition (delta C-13) of wood. The sensitivity of ring width, wood density and delta C-13 to climatic variables differed; with tree-ring width responding to environmental conditions (temperature or precipitation) during the first half of a growing season and maximum density correlated with temperatures in the second part of a growing season (July-September). delta C-13 variations indicate re-allocation and storage processes and effects of drought during the main growing season. About 20% of inter-annual variation of tree-ring width was explained by the tree-ring width of the previous year. This was confirmed by delta C-13 of wood which showed a contribution of stored carbohydrates to growth in spring and a storage effect that competes with growth in autumn. Only mid-season delta C-13 of wood was related to concurrent assimilation and climate. The comparison of seasonal changes in tree-ring maximum wood density and isotope composition revealed that an increasing seasonal water deficit changes the relationship between density and C-13 composition from a negative relation in years with optimal moisture to a positive relationship in years with strong water deficit. The climate signal, however, is over-ridden by effects of stand density and crown structure (e.g., by forest management). There was an unexpected high variability in mid season delta C-13 values of wood between individual trees (-31 to -24 parts per thousand) which was attributed to competition between dominant trees as indicated by crown area, and microclimatological variations within the canopy. Maximum wood density showed less variation (930-990 g cm(-3) stop). The relationship between seasonal changes in tree-ring structure and C-13 composition can be used to study carbon storage and re-allocation, which is important for improving models of tree-ring growth and carbon isotope fractionation. About 20-30% of the tree-ring is affected by storage processes. The effects of storage on tree-ring width and the effects of forest structure put an additional uncertainty on using tree rings of broad leaved trees for climate reconstruction.

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Держатели документа:
Max Planck Inst Biogeochem, Jena, Germany
Russian Acad Sci, Inst Forest, SB, Krasnoyarsk 660036, Russia
Univ Calif Berkeley, ESPM Dept, Berkeley, CA 94720 USA

Доп.точки доступа:
Skomarkova, M.V.; Vaganov, E.A.; Mund, M...; Knohl, A...; Linke, P...; Boerner, A...; Schulze, E.D.

[Text] / E. A. Vaganov [et al.] // Oecologia. - 2009. - Vol. 161, Is. 4. - P729-745, DOI 10.1007/s00442-009-1421-y. - Cited References: 72. - This work was supported by Alexander von Humboldt (Research Award 2003 for E. Vaganov) and the Russian Foundation of Basic Research (RFBR-05-04-48069). We thank Alessandro Cescatti, Leonardo Montagnani, Stefano Minerbi and Claudio Mutinelli for providing the climate and nitrogen data for Renon, Sune Linder for dendrometer data, and Anders Lindroth for eddy flux data of the Flakaliden site. We thank Gerd Gleixner for discussion of this manuscript. We also like to thank Annett Boerner for the artwork and Jens Schumacher for advice on statistical analyses. . - 17. - ISSN 0029-8549РУБ Ecology

Аннотация: Tree-ring width, wood density, anatomical structure and C-13/C-12 ratios expressed as delta C-13-values of whole wood of Picea abies were investigated for trees growing in closed canopy forest stands. Samples were collected from the alpine Renon site in North Italy, the lowland Hainich site in Central Germany and the boreal Flakaliden site in North Sweden. In addition, Pinus cembra was studied at the alpine site and Pinus sylvestris at the boreal site. The density profiles of tree rings were measured using the DENDRO-2003 densitometer, delta C-13 was measured using high-resolution laser-ablation-combustion-gas chromatography-infra-red mass spectrometry and anatomical characteristics of tree rings (tracheid diameter, cell-wall thickness, cell-wall area and cell-lumen area) were measured using an image analyzer. Based on long-term statistics, climatic variables, such as temperature, precipitation, solar radiation and vapor pressure deficit, explained < 20% of the variation in tree-ring width and wood density over consecutive years, while 29-58% of the variation in tree-ring width were explained by autocorrelation between tree rings. An intensive study of tree rings between 1999 and 2003 revealed that tree ring width and delta C-13-values of whole wood were significantly correlated with length of the growing season, net radiation and vapor pressure deficit. The delta C-13-values were not correlated with precipitation or temperature. A highly significant correlation was also found between delta C-13 of the early wood of one year and the late wood of the previous year, indicating a carry-over effect of the growing conditions of the previous season on current wood production. This latter effect may explain the high autocorrelation of long-term tree-ring statistics. The pattern, however, was complex, showing stepwise decreases as well as stepwise increases in the delta C-13 between late wood and early wood. The results are interpreted in the context of the biochemistry of wood formation and its linkage to storage products. It is clear that the relations between delta C-13 and tree-ring width and climate are multi-factorial in seasonal climates.

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Держатели документа:
[Schulze, Ernst-Detlef
Brand, Willi A.
Roscher, Christiane] Max Planck Inst Biogeochem, D-07701 Jena, Germany
[Vaganov, Eugene A.
Skomarkova, Marina V.] RAS, Inst Forest SB, Krasnoyarsk 660036, Russia
[Knohl, Alexander] ETH, Dept Plant Sci, CH-8092 Zurich, Switzerland

Доп.точки доступа:
Vaganov, E.A.; Schulze, E.D.; Skomarkova, M.V.; Knohl, A...; Brand, W.A.; Roscher, C...; Alexander von Humboldt; Russian Foundation of Basic Research [RFBR-05-04-48069]