Relationship between tree growth and tree size, competition as well as species diversity in spruce-fir natural forests

Zhang Lanqi; Yang Hua; Zhang Xiaohong

doi:10.12171/j.1000-1522.20220409

Journal of Beijing Forestry University > 2024 > 46(5): 64-72. > DOI: 10.12171/j.1000-1522.20220409

Zhang Lanqi, Yang Hua, Zhang Xiaohong. Relationship between tree growth and tree size, competition as well as species diversity in spruce-fir natural forests[J]. Journal of Beijing Forestry University, 2024, 46(5): 64-72. DOI: 10.12171/j.1000-1522.20220409

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Relationship between tree growth and tree size, competition as well as species diversity in spruce-fir natural forests

1.
State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China
2.
Center for International Cooperation and Exchange, National Forestry and Grassland Administration, Beijing 100714, China

More Information

Received Date: October 09, 2022
Revised Date: January 20, 2023
Available Online: April 18, 2024

Graphical Abstract

Abstract

Abstract

Objective
Tree size, competition, tree species diversity and other factors in the forest stand affect the growth of forest trees, while the individual basal area increment (BAI) is often used to describe tree growth. A random forest model was established to study the individual tree BAI of main tree species in the mixed forest of Changbai Mountain of northeastern China, study and quantify the environmental mechanisms affecting tree growth, aiming to provide a theoretical basis for growth projections.
Method
Data were investigated for 24 consecutive years (1987−2010) in a fixed sample plot with a total sample size of 6 903 trees. Random forest algorithm was used to build individual tree BAI model with 11 independent variables as individual tree, competition factor, diversity, and climate for 6 main tree species in mixed forest. And 10-fold cross-validation was used to optimize hyper parameter mtry and evaluate these models.
Result
(1) The coefficients of determination for the model of BAI for the six major species of Abies nephrolepis, Picea koraiensis, Pinus koraiensis, Tilia amurensis, Betula costata, and Betula platyphylla were 0.663, 0.683, 0.695, 0.459, 0.384, and 0.568, respectively. (2) The basal area (BA) of individual tree was the most important independent variable, and had a strong positive effect on the growth of trees. Competitive factors and tree size diversity were the main factors affecting tree growth, and individual BAI decreased with increasing competitive factors and tree size diversity. (3) The effects of species diversity on tree growth were relatively limited, with increases in species diversity index and mingling degrees accelerating the growth of Abies nephrolepis, Picea koraiensis and Pinus koraiensis to some extent; whereas the effects of climatic factors on tree growth were relatively small.
Conclusion
Tree growth is largely depends on its own growth potential, which is mainly inhibited by competition and tree size heterogeneity in the external environment, while increased species diversity also promotes the growth of dominant species within the forest to some extent. The random forest model can well quantify and express the complex relationship between the variables and BAI of individual tree. It can be used as a tool for forest management practice and providing a new method for forest growth and yield prediction.
- tree growth,
- tree size,
- competition,
- tree species diversity,
- random forest model

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References (39)

References

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Relationship between tree growth and tree size, competition as well as species diversity in spruce-fir natural forests