Effects of neighborhood competition on biomass and distribution of <i>Larix olgensis</i>

Li Yuting; Ma Aiyun; Miao Zheng; Hao Yuanshuo; Dong Lihu

doi:10.12171/j.1000-1522.20230322

Journal of Beijing Forestry University > 2025 > Accepted Manuscript > DOI: 10.12171/j.1000-1522.20230322

Li Yuting, Ma Aiyun, Miao Zheng, Hao Yuanshuo, Dong Lihu. Effects of neighborhood competition on biomass and distribution of Larix olgensis[J]. Journal of Beijing Forestry University. DOI: 10.12171/j.1000-1522.20230322

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Effects of neighborhood competition on biomass and distribution of Larix olgensis

School of Forestry, Northeast Forestry University, Harbin 150040, Heilongjiang, China

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Received Date: November 12, 2023
Revised Date: February 21, 2024
Accepted Date: February 23, 2025
Available Online: February 27, 2025

Graphical Abstract

Abstract

Abstract

Objective
Explore different methods to select competing trees, calculate the neighborhood competition index, and analyzing the response of Larch olgensis biomass to neighborhood competition, to provide a theoretical basis for the study of competition.
Method
Based on the analytical wood data of 147 sample tree of Larix olgensis in Mengjiagang Forest Farm, Heilongjiang Province, this study analyzed the effects of neighborhood competition on the biomass and distribution of wood, bark, branch, leaf and root. Based on four methods (fixed radius method, dynamic radius method, adjacent tree method and control tree number method), correlation analysis and random forest importance ranking were used to select the optimal neighborhood competition index, and then the relationship between biomass, distribution and neighborhood competition was analyzed.
Result
The optimal competition index varies with different methods. The competition index (CI₃), which is related to the diameter at breast height of the competing trees and the object trees, has the strongest correlation with the biomass when using the fixed radius method. When the dynamic radius method is used, the competition index (CI₁), which is related to the diameter at breast height and the distance between the competing trees and the object trees, has the strongest correlation with biomass. The competition index (CI₉), which is related to the diameter at breast height, height and distance between the competing trees and the object trees, has the strongest correlation with biomass when adjacent wood method is used. Competition index CI₁ has the strongest correlation with biomass when the control plant number method is used. By further analysis, it was found that the correlation between competition index and biomass calculated by controlling tree number method was the strongest. There was a significant negative correlation between the biomass of each component and the field competition index (P < 0.001). The biomass distribution ratio of each component was wood (63.6%) > root (17.8%) > branch (10.0%) > bark (6.6%) > leaf (2.0%). There was a significant negative correlation between the neighborhood competition index and the biomass distribution ratio of wood and root (P < 0.001), and a significant positive correlation between the neighborhood competition index and the biomass allocation ratio of bark, branch and leaf (P < 0.001).
Conclusion
When analyzing the relationship between competition index and biomass of Larix olgensis, it was found that neighborhood competition had a significant effect on the biomass and distribution of each component of Larix olgensis. Therefore, the effects of competition on biomass should be considered when biomass models are used to estimate the biomass of each component of Larix olgensis, which provides theoretical support for accurate estimation of the biomass of Larix olgensis plantation in Northeast China.
- Larix olgensis,
- biomass,
- neighborhood competition index,
- competing tree

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References (28)

References

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Effects of neighborhood competition on biomass and distribution of Larix olgensis