J Plant Ecol ›› 2023, Vol. 16 ›› Issue (1): rtac077.DOI: 10.1093/jpe/rtac077

• Research Articles •    

Accelerated warming in the late 20th century promoted tree radial growth in the Northern Hemisphere

Jie Liu1,2, Zong-Shan Li1,3,*, Maierdang Keyimu4, Xiaochun Wang5, Haibin Liang6, Xiaoming Feng1, Guangyao Gao1,3 and Bojie Fu1   

  1. 1 State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, 2 University of Chinese Academy of Sciences, Beijing 100049, China, 3 National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi, Xi’an 710061, China, 4 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China, 5 Center for Ecological Research, Northeast Forestry University, Harbin 15040, China, 6 Institute of Geographical Science, Taiyuan Normal University, Jinzhong 030619, China

    *Corresponding author. E-mail: zsli_st@rcees.ac.cn
  • Received:2022-03-29 Revised:2022-04-27 Accepted:2022-07-08 Online:2022-07-21 Published:2023-02-01


Accelerated global warming in the late 20th century led to frequent forest-decline events in the Northern Hemisphere and increased the complexity of the relationships between tree growth and climate factors. However, few studies have explored the heterogeneity of responses of tree growth to climate factors in different regions of the Northern Hemisphere before and after accelerated warming. In this study, a total of 229 temperature-sensitive tree-ring width chronologies from nine regions on three continents in the Northern Hemisphere were used in the data analysis performed herein. A bootstrapped correlation analysis method was used to investigate whether the tree growth-climate response changed significantly in different regions between the periods before and after rapid warming. Probability density functions and piecewise linear fitting were used to study the fluctuation characteristics of the tree-ring width indices before and after rapid warming. At the end of the 20th century (from 1977 to 2000), rapid warming significantly promoted the radial growth of trees in different regions of the Northern Hemisphere, but tree radial growth was heterogeneous among the different regions from 1950 to 2000. After 1976, except in central North America and northern Europe, the correlation between tree growth and temperature increased significantly in the Northern Hemisphere, especially in Asia. From 1977 to 2000, tree-ring index and temperature divergences were observed in nine regions with a divergence of 2–5 years. From 1950 to 2000, tree growth tracked better average temperature variability in the Northern Hemisphere than regional temperature.

Key words: climate warming, Northern Hemisphere, tree-ring, tree growth-climate relationship, divergence


关键词: 气候变暖, 北半球, 树轮, 树木生长-气候关系, 分离效应