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Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau

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The threshold minimum air temperature driving xylem growth of alpine  Rhododendron aganniphum is lower than that commonly observed at the treeline of conifers.

Abstract

Understanding how alpine shrubs grow and which environmental factors drive their biomass gain could help to functionally differentiate trees and shrubs. The cambium is the main meristem responsible for wood formation in trees and shrubs. Thus, a better knowledge of cambium growth dynamics in alpine shrubs would allow explaining why shrubs displace trees above the treeline. Here, we aim to investigate the timings and dynamics of xylogenesis and to identify the thermal thresholds controlling the onset of xylem growth of Rhododendron aganniphum, a tall shrub growing above the alpine treeline on the Tibetan Plateau. Timings of xylogenesis and radial growth rates were assessed from anatomical observations of the developing xylem during three growing seasons (2011, 2012, and 2013). The threshold temperature at which xylogenesis had a 0.5 probability of being active was calculated with logistic regressions. The onset of xylogenesis was observed between mid and late June, whereas the end of xylogenesis lasted from mid to late September. Overall, the duration of xylem growth lasted 88–101 days, and 94 % of the ring was formed from June to August. The threshold for the onset of xylem growth was observed at 2.0 ± 0.6 °C for the minimum air temperature, lower than that commonly observed for treeline conifers (ca. 6 °C). This low thermal threshold allows alpine shrubs to have a growing season long enough to complete xylem production and maturation during the warmest summer months. Our results suggest that the time required to complete xylogenesis is critical to understand why shrubs displace trees above the treeline.

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Acknowledgments

We thank the Southeast Tibet Station for Alpine Environment Observation and Research, Chinese Academy of Sciences for the fieldwork and monitoring. This work was supported by the National Natural Science Foundation of China [41525001, 41130529, 41471158].

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Correspondence to Eryuan Liang.

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Communicated by A. Braeuning.

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Li, X., Rossi, S., Liang, E. et al. Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau. Trees 30, 2091–2099 (2016). https://doi.org/10.1007/s00468-016-1436-z

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