JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (2): 150-158.doi: 10.12302/j.issn.1000-2006.202101008

Previous Articles     Next Articles

Effects of climate warming on radial growth of Larix gmelinii in Wudalianchi, Heilongjiang Province

XIE Lihong1,2(), HUANG Qingyang1, CAO Hongjie1, YANG Fan1, WANG Jifeng1, NI Hongwei2,3,*()   

  1. 1. Institute of Natural Resources and Ecology,Heilongjiang Academy of Sciences, Harbin 150040, China
    2. National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin 150040, China
    3. Heilongjiang Academy of Forestry, Harbin 150040, China
  • Received:2021-01-07 Accepted:2021-03-19 Online:2022-03-30 Published:2022-04-08
  • Contact: NI Hongwei E-mail:xielihong903@163.com;nihongwei2000@163.com

Abstract:

【Objective】The Longmen stone village lava platform is the main distribution area of the Larix gmelinii natural forest in the community of the Wudalianchi volcano group. In this study, we explored the response of the radial growth of L. gmelinii in Longmen stone village to climate warming over the past 51 years (1968-2018) and provided a scientific basis for the vegetation succession trend of the Wudalianchi volcano group under global warming. 【Method】We performed the Mann-Kendall test to determine the trend of temperature change and the years of possible abrupt air temperature changes over the past 51 years. We also analyzed the response characteristics of the radial growth of L. gmelinii to climate change over two periods (1968-1981 and 1982-2018) using tree-ring climatology. 【Result】We found that the mean air temperature of Wudalianchi has been increasing in the past 44 years (1975-2018) and that 1981 was the mutation point. After global warming, both the ring index and basal area increment of L. gmelinii decreased; the tree-ring index showed an upward trend, while the basal area increment showed a downward trend, but the changes were not significant. The “separation effect” appeared in the response of the radial growth to the increased air temperature. Together, water and temperature controlled the growth of L. gmelinii, but air temperature was the main factor affecting the radial growth. The response pattern of the radial growth to climatic factors was significantly affected by global warming. Meanwhile, the response sensitivity of the radial growth to the annual mean air temperature, annual mean minimum air temperature, and coldness index was significantly enhanced. However, the main factors that determined the ring width of L. gmelinii were the precipitation in November of the previous year and the mean minimum air temperature in February, March, and the pre-growing season of the current year. 【Conclusion】Although the climate warmed significantly in Wudalianchi after 1981, it did not have a significant impact on the radial growth of L. gmelinii. The reason for the “separation effect” and the significant changes in the response of the radial growth to climatic factors may be the drought stress after warming.

Key words: Larix gmelinii, climate warming, radial growth, basal area increment, lava platform

CLC Number: