文献类型：期刊文献

英文题名：Early-Late Correlations of Growth Traits of Eucalyptus urophylla S.T. Blake Clones over a Rotation

作者：Yin, Jianchao[1] Li, Guangyou[1] Lu, Zhaohua[1]

第一作者：Yin, Jianchao

通信作者：Lu, ZH[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

年份：2025

卷号：14

期号：24

外文期刊名：PLANTS-BASEL

收录：;Scopus(收录号：2-s2.0-105026079333);WOS:【SCI-EXPANDED(收录号:WOS:001646563500001)】；

基金：This research was supported by the National Key Research and Development Program of China during the 14th five-year plan Period (Grant No: 2023YFD2201003) and the Guangdong Forestry Seedling Research Program (Grant No: 2025-SL02603).

语种：英文

外文关键词：Eucalyptus urophylla; clone; early-late correlation; optimal selection age

摘要：Eucalyptus urophylla is a core tree species for short-rotation industrial timber plantations in South and Southwest China. However, the dynamic correlation rules of its growth traits during the full rotation period remain unclear, and the theoretical research on early selection is insufficient. In this study, 12 pure E. urophylla clones (including U6 and MLA as controls) were used as plant materials. Based on the data of tree height (H), diameter at breast height (DBH, D), and individual tree volume (V) from 0.5 to 7.5 years old, the correlation rules of early and late growth traits were explored, core predictive traits were screened, and the optimal selection age was determined through rank correlation, phenotypic and genetic correlation analyses, combined with regression modeling and selection efficiency calculation. Early selection of E. urophylla clones was feasible: after 3.5 years, the early-late phenotypic and genetic correlation coefficients of H, D, and V all reached significant or highly significant levels, and the genetic correlation coefficients were greater than the phenotypic ones, indicating that genetic factors dominated trait correlations with little environmental interference. All five established early selection regression models passed the highly significant test. Among them, the models of D-early versus D-late, V-early versus V-late, and D-early versus V-late had the highest coefficients of determination (0.9293-0.9385), making them the optimal selection traits; the models of H-early versus H-late and H-early versus V-late had lower coefficients of determination (0.8010-0.8364) due to errors in height measurement. The best selection effect was achieved within 1/2-2/3 of the rotation period: for a 6-year rotation period (pulpwood), the optimal selection age was 3.5 years old (annual efficiency 1.318); for an 8-year rotation period (medium-diameter timber), it was 4.5 years old (annual efficiency 1.345); and for a 12-year rotation period (large-diameter timber), it was 6.5 years old (annual efficiency 1.379). This study not only fills the theoretical gap in early selection of E. urophylla during the full rotation period but also constructs an integrated early selection technology system of "trait screening-model prediction-age determination". It provides key support for shortening the breeding cycle of E. urophylla and achieving precise control of breeding costs and offers important references for early selection research on fast-growing broad-leaved tree species worldwide.