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Scientia Silvae Sinicae ›› 2019, Vol. 55 ›› Issue (10): 181-192.doi: 10.11707/j.1001-7488.20191018

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Growth Variation and Selection Effect of Cunninghamia lanceolata Provenances at Different Stand Ages

Hanbin Wu1,Aiguo Duan1,2,*,Jianguo Zhang1,2   

  1. 1. Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration State Key Laboratory of Tree Genetics and Breeding Research Institute of Forestry, Chinese Academy of Forestry Beijing 100091
    2. The Southern Modern Forestry Collaborative Innovation Center, Nanjing Forestry University Nanjing 210037
  • Received:2018-11-22 Online:2019-10-25 Published:2019-11-26
  • Contact: Aiguo Duan
  • Supported by:
    江西省林业厅科技创新专项(201702);国家自然科学基金项目(31570619);国家自然科学基金项目(31370629)

Abstract:

Objective: Through the investigation of the growth traits of a 33-year-old Chinese fir (Cunninghamia lanceolata) provenance trial, the genetic variation and geographical variation patterns of the main growth traits of Chinese fir provenances were studied, the effects of early selection were tested to determine the appropriate age, and to select suitable and excellent provenances for the experimental area. Method: Provenances from the full natural range of Chinese fir planted in Liuzhou, Guangxi in 1981 were studied. DBH and tree height at 5, 6, 8, 12, and 33 years of age were measured for each tree, genetic variation in major growth traits were analyzed among different provenances at different ages. The study analyzed the geographical variation of Chinese fir by using the trend surface technique, determined the age range of early selection by using juvenile-mature correlation and evaluated of long-term selection effect of excellent provenances by cluster analysis.Result: There were significant differences in DBH, plant height and volume among different provenances at different ages (P < 0.01).The heritability of DBH, tree height and volume of Chinese fir at provenance level reached 0.35-0.76, and with the increase of age, the heritability of each trait showed a rising and gradually stabilizing trend. There were obvious geographical variation patterns among the tested provenances, and both the DBH and the tree height growth patterns are two-way gradients. The longitude direction showed an insignificant positive variation, and the latitude direction showed increases followed by decreases, and the variation is larger. The research on early selection of provenance showed that the selection in the 6-12 years can include 69%-74% of the final selection. Screening 42 fast-growing provenances from 199 reference sources, and their DBH, tree height and volume reached 24.04 cm, 15.31 m and 0.31 m3 respectively. Compared with the average diameter of Guangxi native provenance, the average DBH increased by 15.70%, the average tree height increased by 11.13%, the average volume increased by 40.17%, and the average genetic gain reached 10.36%, 8.66% and 31.65%, respectively. Objective: There were significant differences in DBH, plant height and volume of provenances at different ages, and the heritability of main growth traits showed an upward and gradually stable trend. The selection of 6-12 years is more conducive to improving the efficiency of Chinese fir genetic improvement. The 42 excellent provenances selected from the 33-year-old mature Chinese fir forests have a larger increase than the local provenances, and are suitable for promotion in the Guangxi Zhuang Autonomous Region and surrounding areas.

Key words: Cunninghamia lanceolata, provenance test, early selection, genetic gain, growth

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