Characteristics of growth and heartwood formation in planted teak in South China
Dominant trees in 31 and 32 years old teak plantation were selected for trunk analysis to study the growth process and heartwood formation characteristics by scanning the disk with scanner and measuring the data with software. The results showed that tree height at the early growth stage (1 to 8 years) was more than that of the DBH (1 to 4 years) for 4 years. The middle growth stage of DBH (5 to 18 years) (stable growth stage) was longer than that of tree height (9 to 13 years) for 9 years. The average growth curve of the volume was not intersected with annual growth curve, which indicated that 31 years old teak plantation had not reached maturity age. The total number of annual rings and the number of heartwood rings were decreased with the increase of tree height, while the number of sapwood rings at different heights changed little. The number of sapwood rings below 16 m of trunk varied about 8 rings, and began to decrease gradually over 16 m. The diameters of xylem, heartwood and sapwood at different heights showed the same trend as the ring, the sapwood width below 22 m was stable, and decreased gradually above 22 m. Affected by taperingness, the heartwood area was larger than sapwood below 10 m, but smaller above 10m. There was a significant positive correlation between the number of heartwood rings with xylem age, diameter of heartwood and xylem diameter (p < 0.01). The growth of dominant tree DBH and tree height in teak plantation began to decline at 18 and 13 years respectively, the current growth and predicted maximum growth were still far lower than cultivation target (DBH ≥ 60cm). The heartwood formation of teak was positively correlated with the diameter growth. It is necessary to breed and utilize teak varieties with small taper and thinning should be done from 13 years for reserved dominant trees. Keywords: Tectona grandis L. f.; dominant tree; stem analysis; growth process; heartwood; sapwood ID: 3619031
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| Format: | Article biblioteca |
| Language: | English |
| Published: |
FAO ;
2022
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| Online Access: | https://openknowledge.fao.org/handle/20.500.14283/cc1714en http://www.fao.org/3/cc1714en/cc1714en.pdf |
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