Abstract
Evaluation of growth differences between clones and families has rarely been studied in slow-growing Cupressus funebris species, and whether such growth differences are related to biomass allocation patterns remains to be revealed and is essential for assessing the genetic selection potential and carbon sink capacity of superior species. We studied the genetic variation, heritability (replication power) and gain levels of 36 clones and 33 families of superior trees and analysed their biomass allocation patterns. The results showed that the early growth of Cupressus funebris was dominated by height growth, and the clones grew rapidly, with 28.45% and 47.81% higher diameter at breast height (DBH) and height at 9 years old than the family lines, respectively. However, the genetic variation of growth traits in the families was higher than that of the clones. Repeatability of 9-year-old clones for all traits was greater than family heritability. According to the 10% selection rate, the genetic gains of DBH and tree height of clones were 39.53% and 24.23%, respectively, 5.22 times and 2.05 times the genetic gains of families. The range of narrow and broad heritability of each trait was estimated to be 0.55–0.68, with an average value of 0.63, indicating that clones obtained higher additional genetic gains through nonadditive effects. The growth advantage of the clones was to increase the biomass of the aboveground part (86.03%) at the expense of the belowground biomass allocation, which was mainly reflected by the proportion of branch biomass allocation (18.45%). The branches and leaves of clones were mainly middle and upper, and the proportion of upper branches and leaves was 5.2% and 33.64% higher than those of the family, respectively, while the middle and lower layers of the branches and leaves of the family lines accounted for a higher percentage. The model \(\mathrm{ln}W={k}_{0}+{k}_{1}\mathrm{ln}D+{k}_{2}\mathrm{ln}H\)+\({k}_{3}\mathrm{ln}C\) has the best prediction of biomass and could be used for early genetic evaluation of Cupressus funebris by introducing the under branch height as an independent variable. In general, Cupressus funebris clones are fast growing and will help to improve the productivity and carbon storage of stands through genetic selection and utilization.
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Acknowledgements
The authors thank Derong Fan (Forest Farm of Kaihua County in Zhejiang Province) for their assistance in the investigation of the experimental forests.
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This work was funded by Zhejiang Science and Technology Major Program on Agricultural New Variety Breeding (2021C002070-8).
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TY: Formal analysis, Writing—Original Draft. PW: Supervision, Review & Editing. WW: Investigation, Data curation. GJ: Investigation, Data curation. YQ: Investigation. HS: Investigation. ZZ: Conceptualization, Methodology, Writing—Review & Editing, Project administration. ZZ: Supervision.
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Yang, T., Wang, P., Wang, W. et al. Early growth evaluation and biomass allocation difference between clones and families in Cupressus funebris. Eur J Forest Res 142, 839–850 (2023). https://doi.org/10.1007/s10342-023-01563-y
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DOI: https://doi.org/10.1007/s10342-023-01563-y