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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (10): 3505-3511.doi: 10.13287/j.1001-9332.202110.015

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Response of intra-annual stem radial growth to drought events: A case study of Pinus tabuliformis in the Helan Mountains, China

GAO Jia-ni1,2, YANG Bao1*, QIN Chun1   

  1. 1Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000;
    2University of Chinese Academy of Sciences, Beijing 100049
  • Received:2021-04-14 Revised:2021-07-23 Online:2021-10-15 Published:2022-04-15
  • Contact: * E-mail: yangbao@lzb.ac.cn
  • Supported by:
    National Natural Science Foundation of China (41520104005), the National Key R&D Program of China (2017YFA0603301), and the Autonomous Deployment Project of Northwest Institute of Eco-Environmental Resources, Chinese Academy of Sciences (E055020101, Y951971001).

Abstract: The stem radius growth of Pinus tabuliformis was monitored by dendrometer during the growing season in 2017 and 2018 at two altitudes (2010 and 2330 m) in the Helan Mountains. We investigated the responses of tree radial growth to drought events. The results showed that drought event in June 2018 reduced stem growth rate of P. tabuliformis. The precipitation in July and August reactivated the stem radius growth. The main growing season of P. tabuliformis stem was June-August in 2018, which was a month longer than that in 2017. The response patterns between stem radial growth of P. tabuliformis and climatic factors were consistent across forest stands in different altitudes. Drought in the early growing season suppressed the radial growth of trees, while precipitation in the mid- and late growing seasons played an important role in promoting the radial growth of trees. The effects of climatic factors in August on tree-ring width should be considered during climate reconstruction in this region.

Key words: stem radial growth, drought, altitude, Dendrometer, Pinus tabuliformis