Branching and growth of plantings in fifth year of a seedling seed orchard of Masson pine (Pinus massoniana Lamb.)
Tóm tắt
The features of branching and growth studied included height, diameter at breast height (DBH), total number of branches, annual height growth, annual branch elongation in the year of elongating, annual branch number for four consecutive years, diameter of branches of different ages, and diameter of stem where branch-whorl originates. For features of total growth and overall branching, no significant differences were found between families, except for DBH. For annual features, no significant differences were found in annual stem height growth, annual branch elongation in the year of elongation and diameter of branches. In the last four years, differences in number of branches were not significant in the first two years but were significant in the last two year; differences in stem diameter where branch-whorls grow were significant for the four consecutive years. Trend of annual growth and branching features of families can be divided into three types as increasing type, stable type and fluctuating type. Most of families have an increasing type with respect of annual height growth and annual branch elongation, while most families belong to a fluctuating type with annual branch number. The results indicated that in the fifth year after planted in seedling seed orchard, differences between families were mostly insignificant. This result may have two main explanations: one is the growth rhyme in early ages of Masson pine, the other one is the complex paternal components to form the open-pollinated families. Family selection seemed to be not useful based on the result. It is suggested to select some of families in the nursery instead of to use all the families when establishing seedling seed orchards with open-pollinated families from plus-trees.
Tài liệu tham khảo
Baldwin, V.C. and Peterson, K.D. 1997. Predicting the crown shape of loblolly pine trees [J]. Can. J. For. Res.,27: 102–107.
Caron, G.E. and Powell, G.P. 1992. Pattern of cone distribution in crowns of youngPicea mariana. I effect of tree age on seed cones [J]. Can. J. For. Res.,21: 446–454.
Hand, F.C. 1979. Top-pruning ofPinus radiata in breeding arboreta [J]. Aust. For. Res.,9(1): 1–7.
Hinze, W.H.F. 1986. Branch pruning research ofPinus radiata [J]. South Afri. For. J.,127(6): 1–11.
Ho, R.H. 1984. Seed cone receptivity and seed production potential in white spruce [J]. For. Eco. Manag.,9: 161–171.
Ho, R.H. 1980. Pollination mechanism and seed production potential in Douglas-fir [J]. For. Sci.,26: 522–528.
Jensen, E.C., and Long, J.N. 1992. Crown structure of a codomint Douglas-fir [J]. Can. J. For. Res.,13: 264–269.
Lai Huanlin, Qiu Jinqing and Chen Jingde. 1998. A study on branching and cone setting of grafted plants in clonal seed orchard of Masson pine (Pinus massoninana Lamb.) [J]. Journal of Nanjing Forestry University.22(3): 86–90.
Lai Huanlin, Qiu, J. Q. and Chen, J. D. 1998. A study on branching and cone setting of grafted plants in clonal seed orchard of Masson pine (Pinus massoninana Lamb.) [J]. Journal of Nanjing Forestry University,22(3): 86–90.
Phillipson, J.J. 1985. The effect of top pruning, girdling and GA4/7 on the production and distribution of pollen and seed cones in Sitka spruce [J]. Can. J. For. Res.,15: 1125–1128.
Qin Guofeng, Jing Guoqing, Zhou Zhichun,et al. 1990. Inheritance and variation of juvenile growth traits in open-pollinated families of Masson pine’s natural stands [C]. In: Wang Zhangrong (ed.) proceeding on Techniques for Establishing Seed Orchard of Masson Pine, Beijing: Academic Book & Periodical Press, PP21–25.
Qiu Jinqing. 1998. Experience in establishment of Masson pine seedling seed orchard [J]. Journal of Nanjing Forestry University,22(3): 99–102.
Ross, S.D. and Currell, R.C. 1989. Effect of top-pruning, branch-thinning and Gibberellin A4/7 treatment on the production and distribution of cone-buds in Douglas-fir [J]. Silv. Genet.,38(5–6): 177–185.
Shoen, D.J.et al. 1986. Srobilus production in a clonal white spruce seed orchard: Evidence for unbalanced mating [J]. Sil. Genet.,35: 201–205.
Van Buijtenen, J.P. and Brown, C.L. 1962. The effect of crown pruning on strobilus production of loblolly pine [C]. In: Procd. For. Genet. Workshop. South. For. Tree Improv. Comm. Pub I, 22. pp 83–93
Van Haverbeke, D.D. 1986. Crown shape in aPinus sylvestris L. clonal seed orchard [J]. Silv. Genet.,15(3–4): 236–240
Varnell, R.J. 1969. Female-strobilus production in a slash pine seed orchard following branch pruning [C]. Procd. 10th. South. For. Tree Improv. Conf. Houston.
Wang Zhangrong and Lai Huanlin. 1994. The status of forest tree seed orchards and the improvement of seed quantity and genetic quality [C]. In: Shen, X.H. (ed.): Seed Orchard Techniques for High Genetic Quality and Ample Production of Seeds. Beijing: China Forestry Publishing House, pp 140–145.
Zobel, B.J. and Talbert, J. 1984. Applied Forest Tree Improvement [M]. John Wiley & Sons. Inc.
Zhang Huaxin 1996. The Genetic and cultural basis for high genetic quality and ample yield ofPinus tablaeformis Carr. Seed orchards [D]. Ph.D. thesis. Beijing Forestry University.