Abstract
This research is an attempt to study seasonal translocation patterns of photoassimilated carbon within trees of one of the high latitudes widespread deciduous conifer species Larix gmelinii (Rupr. Rupr). For this purpose, we applied whole-tree labeling by 13CO2, which is a powerful and effective tool for tracing newly developed assimilates translocation to tissues and organs of a tree. Experimental plot has been established in a mature 105-year-old larch stand located within the continuous permafrost area near Tura settlement (Central Siberia, 64°17′13″N, 100°11′55″E, 148 m a.s.l.). Measurements of seasonal photosynthetic activity and foliage parameters (i.e., leaf length, area, biomass, etc.), and sampling were arranged from early growing season (June 8, 2013; May 14, 2014) until yellowing and senescence of needles (September 17, 2013; September 14, 2014). Labeling by 13C of the tree branch (June 2013, for 3 branch replicates in 3 different trees) and the whole tree was conducted at early (June 2014), middle (July 2014), and late (August 2013) phase of growing season (for different trees in 3 replicates each time) by three pulses [(CO2)max = 3000–4000 ppmv, 13CO2 (30 % v/v)]. We found at least two different patterns of carbon translocation associated with larch CO2 assimilation depending on needle phenology. In early period of growing season (June), 13C appearing in newly developed needles is a result of remobilized storage material use for growth purposes. Then approximately at the end of June, growth processes is switching to storage processes lasting to the end of growing season.
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Acknowledgments
We would like to thank staff of laboratory of biogeochemical cycles in forest ecosystems at V.N. Sukachev Institute of Forest Siberian Branch, namely Tsukanov A.A., Timokhina A.V., Klimchenko A.V., Panov A.V. for the various technical assistance during fieldworks at Tura Station (Evenkia, Russian Federation). This work was partly supported by the Russian Foundation of Basic Research (Grant No 13-04-00659-a) and by the Russian Science Foundation (14-24-00113).
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Masyagina, O., Prokushkin, A., Kirdyanov, A. et al. Intraseasonal carbon sequestration and allocation in larch trees growing on permafrost in Siberia after 13C labeling (two seasons of 2013–2014 observation). Photosynth Res 130, 267–274 (2016). https://doi.org/10.1007/s11120-016-0250-1
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DOI: https://doi.org/10.1007/s11120-016-0250-1