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Chinese Journal of Applied Ecology ›› 2023, Vol. 34 ›› Issue (7): 1779-1786.doi: 10.13287/j.1001-9332.202307.007

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Differences in ecological resilience of radial growth between Larix principis-rupprechtii and Picea meyeri after drought

XIE Pingping1, ZHANG Boyi1, DONG Yibo1, LYU Pengcheng1, DU Mingchao1, ZHANG Xianliang1,2,3*   

  1. 1College of Forestry, Hebei Agricultural University, Baoding 071001, Hebei, China;
    2Urban Forest Healthy Technology Innovation Center in Hebei Province, Baoding 071001, Hebei, China;
    3National Forestry and Grassland Bureau Saihanba Forest Cultivation National Long-term Scientific Research Base, Chengde 068456, Hebei, China
  • Received:2023-03-10 Accepted:2023-05-19 Online:2023-07-15 Published:2024-01-15

Abstract: To understand the responses of radial growth to climatic factors and the differences in ecological resilience to drought between a heliophilous species Larix principis-rupprechtii and a shade species Picea meyeri in mixed forests, we developed the tree-ring width chronologies of L. principis-rupprechtii and P. meyeri in three mixed forests based on the samples collected from Toudaogou of Saihanba in Hebei, Ningwu County and Kelan County in Shanxi Province. We analyzed the correlation between climatic factors and various chronologies and examined the differences in resistance (Rc), recovery (Rt), and resilience (Rs) of L. principis-rupprechtii and P. meyeri in response to drought stress. The results showed that the radial growth of L. principis-rupprechtii and P. meyeri was negatively correlated with the mean and maximum air temperature from May to July in three mixed forests, and was positively correlated with the Palmer drought index (PDSI) from May to September. Radial growth decline in trees due to drought stress was significantly different between the two species among the three sites, indicating different physiological and ecological regulation strategies. The resistance of P. meyeri was stronger than that of L. principis-rupprechtii at the three study sites, with stronger resilience and resilient elasticity of L. principis-rupprechtii than P. meyeri. As a result, P. meyeri exhibited greater drought resistance than L. principis-rupprechtii. Under global warming condition, L. principis-rupprechtii might be at greater risk of growth decline than P. meyeri in this region.

Key words: radial growth, Larix principis-rupprechtii, Picea meyeri, drought event, ecological resilience