Response of regional tree-line forests to climate change: evidence from the northeastern Tibetan Plateau |
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| Authors: | Keyan Fang Xiaohua Gou Fahu Chen Jianfeng Peng Rosanne D’Arrigo William Wright Mai-He Li |
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| Institution: | (1) Key Laboratory of Western China’s Environmental Systems (MOE), Center for Arid Environment and Paleoclimate Research (CAEP), Lanzhou University, 730000 Lanzhou, China;(2) Tree-Ring Lab, Lamont-Doherty Earth Observatory of Columbia University, New York, NY 10964, USA;(3) Tree Physiology Division, Swiss Federal Research Institute WSL, 8903 Birmensdorf, Switzerland;(4) Mountain Ecology and Hydrology Unit, Institute of Mountain Hazards and Environment Chinese Academy of Sciences, 610041 Chengdu, China |
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| Abstract: | Tree-ring width and age structure of Juniperus przewalskii (Qilian juniper) forests were analyzed for four tree-line sites in Qilian and Anyemaqen Mountains, northeastern Tibetan Plateau,
to investigate their relationships to climate change. Tree-line growth on Qilian Mountain was mainly limited by temperature
at the low-frequency band. However, tree-line growth in the Anyemaqen Mountain was highly correlated with the current growing
season temperature at the high-frequency band, and with the previous growing season precipitation at the low-frequency band.
A temperature-stressed growth pattern at colder western sites and a moisture-stressed growth pattern at the warm, drier eastern
tree-line sites were detected. The number of surviving trees in the tree-line ecotone was not clearly correlated with temperature
before the 1900s. An unprecedented rise in the number of trees coincided well with the rapid global warming after the 1900s. |
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