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Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (5): 25-33.doi: 10.11707/j.1001-7488.20210503

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Difference in the Relationship between Twig and Leaf of Pinus koraiensis along Latitude

Mingqi Wang,Guangze Jin,Zhili Liu*   

  1. Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education Center for Ecological Research, Northeast Forestry University Harbin 150040
  • Received:2020-02-03 Online:2021-05-25 Published:2021-07-09
  • Contact: Zhili Liu

Abstract:

Objective: The size of twigs and leaves and leafing intensity are closely related to the overall shape of plants. Exploration of the variation of twig and leaf traits in different latitudes can predict the intraspecific variation and survival strategies of plants in different environments. Method: In this study, four different regions in the mixed broadleaved-Korean pine forests were selected to analyze the leafing intensity, cross-sectional area, total leaf area and single leaf area of the main dominant species Pinus koraiensis. The one-way ANOVA was used to test whether there was a significant difference in different latitudes by analyzing twig traits and leaf traits. The standardized major axis (SMA)was used to investigate the effects of latitude on the relationships between volume-based leafing intensity and individual leaf area, and between twig cross sectional area and individual leaf area, total leaf area, volume-based leafing intensity. Result: 1) The latitude explanatory rate of changes in total leaf area, twig cross-sectional area and leafing intensity of P. koraiensis were was all less than 8%, and the latitude explanatory rate of changes in individual leaf area was the highest at 58%. 2) The twig cross-sectional area had an allometric growth with volume-based leafing intensity and other leaf characters, and it had a significant positive correlation with total leaf area and individual leaf area at different latitudes, but a negative correlation with leafing intensity. At high latitudes, allometric growth was negatively correlated with leafing intensity and individual leaf area. 3) At high latitudes, there was a negative relationship between leaf area and leafing intensity. Conclusion: The leaf and twig traits of P. koraiensis are significantly different at different latitudes. With the change of latitude, the individual leaf area changes significantly, indicating that plants can adjust their phenotypic traits to adapt to the changing environment, and leaf traits are mainly changed. The relationship between twig and leaf traits of P. koraiensis varies in different latitudes, and the slope is relatively small in high latitudes, indicating that plants adopt different resource allocation strategies to adapt to environmental changes, and the leaf and twig traits adapt to environmental changes cooperatively.

Key words: latitude, twig cross-sectional area, volume-based leafing intensity, leaf area

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