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Citation:

Variation Analysis of Tracheid Characteristics and Microfibril Angle Among Species and Hybrids of Larix spp.

  • Received Date: 2010-10-15
  • The variations in tracheid characteristics of earlywood and latewood of 4 species of Larix spp. and their hybrids with L. kaempferi as female parent were studied. The results are as follows: The tracheid characteristics and microfibril angle met or surpassed the requirements needed for superior pulp and paper properties. There were significant or extremely significant differences in the tracheid characteristics of earlywood and latewood among the species and hybrids. The variations of tracheid length for earlywood and latewood were 3 164.45-3 865.26 μm and 3 318.51-4 200.87 μm respectively. The ratios of tracheid length to width varied between 57.10 and 72.93 and 117.95 and 146.50 for earlywood and latewood separately. And that for internal diameter in radial direction were 38.96-46.68 μm and 10.76-12.92 μm for earlywood and latewood individually. Both of the tracheid lengths and the ratios of tracheid length to width for earlywood and latewood of L. kaempferi were larger than that of L. principis-rupprechtii, L. olgensis and L. gmelini. L. kaempferi is more suitable to be used as pulp and paper raw material than the other three species of based on the tracheid characteristics. Most of the tracheid characteristics of the 3 hybrids were closer to that of L. kaempferi 81, the female parent, and surpassed that of their paternal, especially the interspecific hybrids of L. kaempferi × L. olgensis, and L. kaempferi × L. gmelinii far surpassed the values of their paternal species. The radial variation of tracheid length, which is belonged to PashinⅡ, increased sharply at first and then kept at a steady values both for earlywood and latewood. The radial variation of tracheid width for earlywood and latewood and the tracheid internal diameter in radial direction for earlywood did not change much with age. However the tracheid internal diameter in radial direction for latewood displayed decreased tendency during the observed period. The technical maturity of Larch stands for pulp and paper using should be between 15 and 20 years old according the radial variation in tracheid traits. The young trees of Larix spp. which are under 20 years old are more suitable for pulp and paper than older ones because of ratios of wall to cavity for latewood of the older are larger which would affect the quality of paper.
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Variation Analysis of Tracheid Characteristics and Microfibril Angle Among Species and Hybrids of Larix spp.

  • 1. Research Institute of Forestry, Chinese Academy of Forestry
  • 2. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China

Abstract: The variations in tracheid characteristics of earlywood and latewood of 4 species of Larix spp. and their hybrids with L. kaempferi as female parent were studied. The results are as follows: The tracheid characteristics and microfibril angle met or surpassed the requirements needed for superior pulp and paper properties. There were significant or extremely significant differences in the tracheid characteristics of earlywood and latewood among the species and hybrids. The variations of tracheid length for earlywood and latewood were 3 164.45-3 865.26 μm and 3 318.51-4 200.87 μm respectively. The ratios of tracheid length to width varied between 57.10 and 72.93 and 117.95 and 146.50 for earlywood and latewood separately. And that for internal diameter in radial direction were 38.96-46.68 μm and 10.76-12.92 μm for earlywood and latewood individually. Both of the tracheid lengths and the ratios of tracheid length to width for earlywood and latewood of L. kaempferi were larger than that of L. principis-rupprechtii, L. olgensis and L. gmelini. L. kaempferi is more suitable to be used as pulp and paper raw material than the other three species of based on the tracheid characteristics. Most of the tracheid characteristics of the 3 hybrids were closer to that of L. kaempferi 81, the female parent, and surpassed that of their paternal, especially the interspecific hybrids of L. kaempferi × L. olgensis, and L. kaempferi × L. gmelinii far surpassed the values of their paternal species. The radial variation of tracheid length, which is belonged to PashinⅡ, increased sharply at first and then kept at a steady values both for earlywood and latewood. The radial variation of tracheid width for earlywood and latewood and the tracheid internal diameter in radial direction for earlywood did not change much with age. However the tracheid internal diameter in radial direction for latewood displayed decreased tendency during the observed period. The technical maturity of Larch stands for pulp and paper using should be between 15 and 20 years old according the radial variation in tracheid traits. The young trees of Larix spp. which are under 20 years old are more suitable for pulp and paper than older ones because of ratios of wall to cavity for latewood of the older are larger which would affect the quality of paper.

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