[Text] / O. V. Sidorova [et al.] // Oecologia. - 2009. -
Vol. 161,
Is. 4. - P825-835,
DOI 10.1007/s00442-009-1411-0. - Cited References: 70. - This study was supported by the Swiss National Science Foundation (SNF 200021_121838/1, PIOI2-119259), the Joint Research Project SCOPES (no. IB73A0-111134), and the Russian Foundation for Basic Research (RFBR nos. 06-05-64095-a, 07-04-96819r_enisey, 07-04-00293a, 09-05-98015_r_sibir_a). This work was conducted in collaboration with the European Union-funded Millennium Project (017008). Special thanks to Prof. Danny McCarroll from Swansea University, UK for useful discussion and valuable comments on the early stage of this manuscript. We would like to thank the editor-in-chief, Christian Korner, the handling editor, Dan Yakir, and the two anonymous reviewers for their helpful comments.
. - 11. - ISSN 0029-8549
РУБ Ecology
Аннотация: Tree-ring width of Larix gmelinii (Rupr.) Rupr., ratios of stable isotopes of C (delta(13)C) and O (delta(18)O) of whole wood and
cellulose chronologies were obtained for the northern part of central Siberia (Tura, Russia) for the period 1864-2006. A strong decrease in the isotope ratios of O and C (after atmospheric delta(13)C corrections) and tree-ring width was observed for the period 1967-2005, while weather station data show a decrease in July precipitation, along with increasing July air temperature and vapor pressure deficit (VPD). Temperature at the end of May and the whole month of June mainly determines tree radial growth and marks the beginning of the vegetation period in this region. A positive correlation between tree-ring width and July precipitation was found for the calibration period 1929-2005. Positive significant correlations between C isotope chronologies and temperatures of June and July were found for whole wood and
cellulose and negative relationships with July precipitation. These relationships are strengthened when the likely physiological response of trees to increased CO(2) is taken into account (by applying a recently developed delta(13)C correction). For the O isotope ratios, positive relationships with annual temperature, VPD of July and a negative correlation with annual precipitation were observed. The delta(18)O in tree rings may reflect annual rather than summer temperatures, due to the late melting of the winter snow and its contribution to the tree water supply in summer. We observed a clear change in the isotope and climate trends after the 1960s, resulting in a drastic change in the relationship between C and O isotope ratios from a negative to a positive correlation. According to isotope fractionation models, this indicates reduced stomatal conductance at a relatively constant photosynthetic rate, as a response of trees to water deficit for the last half century in this permafrost region.
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Scopus Держатели документа: [Sidorova, Olga Vladimirovna
Shashkin, Alexander V.
Knorre, Anastasia A.
Prokushkin, Anatoliy S.
Vaganov, Eugene A.
Kirdyanov, Alexander V.] VN Sukachev Inst Forest, Akademgorodok 660036, Russia
[Sidorova, Olga Vladimirovna
Siegwolf, Rolf T. W.
Saurer, Matthias] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[Knorre, Anastasia A.
Vaganov, Eugene A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
Доп.точки доступа: Sidorova, O.V.; Siegwolf, RTW; Saurer, M...; Shashkin, A.V.; Knorre, A.A.; Prokushkin, A.S.; Vaganov, E.A.; Kirdyanov, A.V.; Swiss National Science Foundation [SNF 200021_121838/1, PIOI2-119259]; Joint Research Project SCOPES [IB73A0-111134]; Russian Foundation for Basic Research (RFBR) [06-05-64095-a, 07-04-96819r_enisey, 07-04-00293a, 09-05-98015_r_sibir_a]; European Union [017008]
