Abstract
Carbon fraction (CF) of trees is essential for quantifying forest carbon (C) stocks. Considerable attention has been paid to CF variations at various levels with the exception of inter- and intra-growth rings. Herein, the inter- and intra-growth ring variation of CF in Pinus tabuliformis was investigated. Elemental analysis was performed to obtain CF values of the earlywood and latewood in each growth ring of the xylem. Patterns of CF variation at the growth ring level were evaluated using mixed-effect models. The results showed that latewood CF, 50.6 %, was significantly higher than earlywood CF, 49.9 % (p < 0.01). In particular, inter-growth ring variations of CF differed between heartwood and sapwood, as well as between juvenile wood and mature wood. CF values decreased nonlinearly with cambium age toward the heartwood or juvenile wood, with estimated least-squares means of 50.4 % and 51.8 %, respectively. While CF values were almost unaltered in sapwood, and slightly decreased in mature wood, with estimated least-squares means of 50.0 % and 50.2 %, respectively. It indicates that patterns of CF variation between juvenile wood and mature wood are important to estimate the C stock of P. tabuliformis. This research provides insights into C uptake dynamics to support forest management and wood utilization.
Funding source: Science & Technology Fundamental Resources Investigation Program
Award Identifier / Grant number: 2023FY101400
Acknowledgments
We would like to thank Haopeng Yan and Zhaohui Luo from the Research Institute of Wood Industry, Chinese Academy of Forestry for their invaluable support in the laboratory. We are also grateful to Yonggang Zhang and Yu Guo from the Research Institute of Wood Industry, Chinese Academy of Forestry for their assistance with field work.
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Research ethics: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: This work was supported by the Science & Technology Fundamental Resources Investigation Program of the Ministry of Science and Technology of China (Grant no. 2023FY101400).
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Data availability: The raw data can be obtained on request from the corresponding author.
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