Počet záznamů: 1  

Annual and intra-annual growth dynamics of Myricaria elegans shrubs in arid Himalaya

  1. 1.
    0466990 - BÚ 2017 RIV DE eng J - Článek v odborném periodiku
    Doležal, Jiří - Lehečková, Eliška - Sohar, Kristina - Dvorský, Miroslav - Kopecký, Martin - Chlumská, Z. - Wild, Jan - Altman, Jan
    Annual and intra-annual growth dynamics of Myricaria elegans shrubs in arid Himalaya.
    Trees: structure and function. Roč. 30, č. 3 (2016), s. 761-773. ISSN 0931-1890. E-ISSN 1432-2285
    Grant CEP: GA ČR GA13-13368S
    Institucionální podpora: RVO:67985939
    Klíčová slova: Climate–growth relationship * Flooding * Tree-rings
    Kód oboru RIV: EF - Botanika
    Impakt faktor: 1.842, rok: 2016

    Key message To disentangle complex drivers of Myricaria elegans growth in arid Himalaya, we combined tree-ring analysis with detailed dendrometer records. We found that the combination of winter frost, summer floods, and strong summer diurnal temperature fluctuations control annual and intra-annual growth dynamics. The relative importance of these drivers is, however, changing with ongoing climate change. Abstract High-mountain areas are among the most sensitive environments to climate change. Understanding how different organisms cope with ongoing climate change is now a major topic in the ecology of cold environments. Here, we investigate climate drivers of the annual and intra-annual growth dynamics of Myricaria elegans, a 3–6 m tall tree/shrub, in a high-elevation cold desert in Ladakh, a rapidly warming region in the NW Himalayas. As Myricaria forms narrow stands around glacier streams surrounded by the desert, we hypothesized that its growth between 3800 and 4100 m will be primarily limited by low temperatures and summer floods. We found that warmer and less snowy conditions in April and May enhance earlywood production. Latewood formation is mostly driven by the June–July temperatures (T). The positive effect of warmer summers on both annual and intra-annual growth is related to fluctuating daily T (from ?30 to 0 C). In particular, dendrometer measurements over a 2-year period showed that net daily growth increments increased when the summer night T remained above 6 C. While high night T during generally cold desert nights promoted growth, high daytime T caused water stress and growth inhibition. The growth–temperature dependency has gradually weakened due to accelerated warming since the 1990s. In addition, positive latewood responses to high March precipitation during the colder 1960s–1980s have become negative during the warmer 1990s–2000s, reflecting an intensification of summer foods.
    Trvalý link: http://hdl.handle.net/11104/0265152

     
     
Počet záznamů: 1  

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