Chin J Plant Ecol ›› 2025, Vol. 49 ›› Issue (7): 1110-1118.DOI: 10.17521/cjpe.2024.0216  cstr: 32100.14.cjpe.2024.0216

• Research Articles • Previous Articles     Next Articles

Seasonal dynamics of radial growth of Pinus koraiensis and Ulmus davidiana var. japonica are related to environmental factors in Changbai Mountain, China

LI Gang-Dun, QIAN Ni-Peng, WANG Lin-Xu, DONG Chun-Chao, LIU Qi-Jing*()   

  1. College of Forestry, Beijing Forestry University, Beijing 100083, China
  • Received:2024-07-04 Accepted:2024-10-09 Online:2025-07-20 Published:2024-10-11
  • Contact: LIU Qi-Jing
  • Supported by:
    Ministry of Science and Technology Basic Resource Survey Project(2019FY101602)

Abstract:

Aims Intra-annual radial growth monitoring using the micro-coring method provides high-resolution and dynamic tree growth information, which is essential for understanding trees’ responses to climate change.
Methods In this study, we utilized the micro-coring method to monitor the seasonal growth dynamics of Pinus koraiensisand Ulmus davidianavar. japonicain the mixed broadleaf-Korean pine forest of Changbai Mountain.
Important findings Our comparative analyses revealed that: (1) The cell enlargement for U. davidianavar. japonica (day of the year (DOY) 116.0 ± 4.70) occurred earlier than that for P. koraiensis (DOY 125.0 ± 2.64), with both species showing a similar trend of initial increase followed by a decrease in cell enlargement length; (2) The growth rate peak for P. koraiensis occurred earlier than that for U. davidianavar. japonica, but the growth duration of U. davidianavar. japonica was longer than that of P. koraiensis. The average xylem growth rate of P. koraiensis was 3.4 μm·d-1, with a maximum rate of 9.4 μm·d-1, whereas for U. davidianavar. japonica, the rates were 11.0 and 23.0 μm·d-1; (3) Both species exhibited highly consistent response trends to environmental factors, although U. davidianavar. japonica exhibited a less intense response to climatic factors compared to P. koraiensis. The radial growth lengths of both species showed significant positive correlations with mean, maximum and minimum air temperatures, relative humidity, and soil temperature, and significant negative correlations with photosynthetically active radiation and vapor pressure deficit. No significant correlations were observed with soil water content and precipitation. Temperature emerged as the primary climatic factor influencing radial growth of P. koraiensis and U. davidianavar. japonica throughout the year, with soil temperature being the most critical climatic factor.

Key words: radial growth, Pinus koraiensis, Ulmus davidiana var. japonica, climatic response, xylem, micro-coring method