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      Influence of stand density, site, age, and competition on the timber assortment structure of Chinese fir plantations

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          Abstract

          The growth of timber assortment is related to site conditions and forest management measures. To our knowledge, however, the effects and relative importance of these factors on the growth of different timber assortments of Chinese fir have not yet been explored. Based on data from long-term fixed observation plots in the northwest of the Chinese fir distribution zone, we examined the effects of planting density and the site index on the timber assortment structure of Chinese fir. Furthermore, we quantified the relative importance of stand factors (age, planting density, stand density index, number of living trees, Gini coefficient, and site index) in determining the growth of various timber assortments. The results showed that the wood yield of all timber assortment types increased as the site quality improved. The outturn and outturn rate of large- and medium-diameter timber were negatively correlated with the planting density. Before the age of 22, planting density had a negative impact on total timber yield and small-diameter timber outturn. After 22 years, planting density had a positive impact on total timber yield and small-diameter timber outturn. SDI (stand density index), age, and SD (stand density) were the most important factors influencing total timber yield and small-diameter timber. The relative importance of age to large-diameter timber was the greatest, followed by SI (site index) and SD. The effects of age, SD, SI, and PD (planting density) on the medium-diameter timber were greater than those of SDI and Gini coefficient. The results indicate small- and medium-diameter timber as the primary target timber assortment types to be cultivated in the study area, while large-diameter timber cannot be effectively produced under the current site conditions. Our findings provide valuable insights for the management of Chinese fir plantations and the directed cultivation of target timber assortments in the northwest of the Chinese fir distribution zone.

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          Hierarchical Partitioning Public-domain Software

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            Global importance of large-diameter trees

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              Linking forest growth with stand structure: Tree size inequality, tree growth or resource partitioning and the asymmetry of competition

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                Author and article information

                Contributors
                duanag@caf.ac.cn
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                23 November 2024
                23 November 2024
                2024
                : 14
                : 29056
                Affiliations
                [1 ]GRID grid.216566.0, ISNI 0000 0001 2104 9346, State Key Laboratory of Efficient Production of Forest Resources, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, , Chinese Academy of Forestry, ; Beijing, 100091 People’s Republic of China
                [2 ]Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, ( https://ror.org/03m96p165) Nanjing, 210037 People’s Republic of China
                Article
                79411
                10.1038/s41598-024-79411-1
                11585659
                39580528
                6625a7cc-10ae-4319-bcf7-d92c9ee370ca
                © The Author(s) 2024

                Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

                History
                : 20 June 2024
                : 8 November 2024
                Funding
                Funded by: Ministry of Science and Technology of the People´s Republic of China
                Award ID: 2021YFD2201301
                Award ID: 2021YFD2201301
                Award ID: 2021YFD2201301
                Categories
                Article
                Custom metadata
                © Springer Nature Limited 2024

                Uncategorized
                planting density,site index,stand factors,chinese fir,timber assortment,forestry,forest ecology

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