2021
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Abstract: Climate warming is expected to positively alter upward and poleward treelines which are controlled by low temperature and a short growing season. Despite the importance of treelines as a bioassay of climate change, a global field assessment and posterior forecasting of tree growth at annual scales is lacking. Using annually resolved tree‐ring data located across Eurasia and the Americas, we quantified and modeled the relationship between temperature and radial growth at treeline during the 20th century. We the… Show more

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“…Fo lowing the theoretical principles of the dual-isotope model [28], we found that photosyn thesis is greater at treeline than at low-elevation forests. The synergistic effect of elevate CO2 and temperature was reported to stimulate forest productivity in high mountainou forest ecosystems of temperature-limited environments [2,49]. Elevated Ca could improv photosynthesis (A) through the enhanced reaction rate of the RuBisco enzyme [50-52 Increased A may improve the non-structural carbon (NSC) pool, which could be used fo sink activities such as growth [53].…”
Section: Discussionmentioning
“…Understanding what determines the high elevation limits of trees is crucial for predicting how treelines may shift in response to climate change. On a global scale, low temperature is found to impact the growth and regeneration of forests at the treeline [1][2][3]. The low temperature limitation on tree metabolism is related to either carbon gain or photosynthesis, known as the "source limitation hypothesis" [4][5][6], or tissue formation, known as the "sink limitation hypothesis" [7,8].…”
Section: Introductionmentioning
“…Because treeline position (not necessarily the growth rate of trees) is defined by temperature irrespective of season length (beyond a minimum of 3 months), treeline elevation can be modelled with surprisingly high precision (Paulsen & Körner, 2014). Camarero et al (2021) suggest that treeline trees became unresponsive to temperature as the climate keeps warming, and thus, predicting treeline position by temperature will become impossible, a message distilled from a multi-site tree ring analysis at current high elevation tree limits. While I do not question the analysis as such and respect the broad sampling, I question the conclusions drawn.…”
Section: 'Fading Of the Temperature-growth Coupling' In Treeline Trees Reflects A Conceptual Biasmentioning
“…The latter study illustrated that growth enhancement in response to climate warming moved upslope in waves during the past century, reflecting a threshold response. Once a thermal threshold is surpassed, the temperature influence diminishes, the adequate explanation of the findings by Camarero et al (2021). However, as the climate warms, the treeline isotherm is moving upslope or poleward, causing trees that might have established more than 100 years ago, to become exposed to conditions that do NOT resemble the climatic treeline.…”
Section: 'Fading Of the Temperature-growth Coupling' In Treeline Trees Reflects A Conceptual Biasmentioning
“…In his letter to the editor, Körner (2021) commented on our recent assessment of climate impacts on tree growth at treeline (Camarero et al, 2021). We share some of his opinions such as the nonlinear responses of growth to temperature.…”
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