TY - JOUR
T1 - Terminal bud size, spring and summer temperatures regulate the timing of height-growth cessation of Smith fir on the southeastern Tibetan Plateau
AU - Zhang, Jingtian
AU - Li, Xiaoxia
AU - Ren, Ping
AU - Leavitt, Steven W.
AU - Rossi, Sergio
AU - Liang, Eryuan
N1 - Funding Information:
This research was supported by the National Natural Science Foundation of China (42030508, 41988101), the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0301) and the Youth Innovation Promotion Association Program of Chinese Academy of Sciences (2020073). We thank the Southeast Tibet Station for Alpine Environment Observation and Research, Chinese Academy of Sciences for the fieldwork and monitoring.
Funding Information:
This research was supported by the National Natural Science Foundation of China (42030508, 41988101), the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0301) and the Youth Innovation Promotion Association Program of Chinese Academy of Sciences (2020073). We thank the Southeast Tibet Station for Alpine Environment Observation and Research, Chinese Academy of Sciences for the fieldwork and monitoring.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - The cessation of height growth, a key event of autumn phenology, plays a vital role for tree growth and forest productivity. Despite its importance, our knowledge of environmental and biotic factors affecting autumnal events in plants remains incomplete. In particular, questions remain whether thermal conditions and previous growth influence the cessation of height growth. Here, we assessed the effects of spring and summer temperatures and terminal bud size on the cessation in height growth of Smith fir (Abies georgei var. smithii) using phenological observations performed in 2013-2019 at four sites located along an altitudinal gradient between 3800 and 4400 m a.s.l. on the southeastern Tibetan Plateau. The cessation of height growth mainly occurred from late–July to early–August with a weak delay along altitude gradient (1.5 days 100 m−1). Structural equation modelling demonstrated that higher summer temperature (June–July) directly advanced the cessation of height growth, whereas warmer spring temperature (March–May) advanced the height-growth cessation mainly through inducing earlier bud swelling (i.e. the onset of height growth). Larger terminal buds delayed the cessation of height growth by increasing growth rates. However, bud swelling was more sensitive to the change in annual mean temperature than height-growth cessation, resulting in an extended duration of height growth under warmer conditions. The warmer conditions expected in a context of climate change would lengthen the period of tree growth and enhance forest productivity on the southeastern Tibetan Plateau.
AB - The cessation of height growth, a key event of autumn phenology, plays a vital role for tree growth and forest productivity. Despite its importance, our knowledge of environmental and biotic factors affecting autumnal events in plants remains incomplete. In particular, questions remain whether thermal conditions and previous growth influence the cessation of height growth. Here, we assessed the effects of spring and summer temperatures and terminal bud size on the cessation in height growth of Smith fir (Abies georgei var. smithii) using phenological observations performed in 2013-2019 at four sites located along an altitudinal gradient between 3800 and 4400 m a.s.l. on the southeastern Tibetan Plateau. The cessation of height growth mainly occurred from late–July to early–August with a weak delay along altitude gradient (1.5 days 100 m−1). Structural equation modelling demonstrated that higher summer temperature (June–July) directly advanced the cessation of height growth, whereas warmer spring temperature (March–May) advanced the height-growth cessation mainly through inducing earlier bud swelling (i.e. the onset of height growth). Larger terminal buds delayed the cessation of height growth by increasing growth rates. However, bud swelling was more sensitive to the change in annual mean temperature than height-growth cessation, resulting in an extended duration of height growth under warmer conditions. The warmer conditions expected in a context of climate change would lengthen the period of tree growth and enhance forest productivity on the southeastern Tibetan Plateau.
KW - air temperature
KW - growth rate
KW - height-growth cessation
KW - late-season phenology
KW - terminal bud
UR - http://www.scopus.com/inward/record.url?scp=85125145246&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85125145246&partnerID=8YFLogxK
U2 - 10.1016/j.agrformet.2022.108883
DO - 10.1016/j.agrformet.2022.108883
M3 - Article
AN - SCOPUS:85125145246
VL - 316
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
SN - 0168-1923
M1 - 108883
ER -