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DocumentGrowth performance of the Teak's (Tectona grandis Linn.f) different planting stocks
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The growth of plantation is dependent on a complex series of interactions between genetics and environmental factors, and the planting stocks including planting methods. For the successful establishment of a plantation, the economically effective means should be explored, as teak plantation is being established in Myanmar especially for commercial purposes including forest rehabilitation purposes. This study was conducted in the 12 years old Teak plantation that was established in compartment No. 24 of Ngalaik Reserved Forest and managed by Forest Research Institute. This plantation was established with different planting stocks; tissue culture seedling, shoot cutting seedling, potted seedling, fresh stump seedling, and grafted seedling in 2008. The main objective of this trial is to explore the growth performance of Teak plantation by applying the different planting stocks. Randomized completely block design (RCBD) was used with 5 replications (5 blocks). In one block, there are 5 plots in which totally of 49 trees were planted in each sub-plot with 2.7 m by 2.7 m spacing. There was a total of 1,225 planted trees in this trial. As a preliminary step, in 2019 through the measurement data, the total basal area of trial area (0.92 ha) is 16.46 m2 (17.89 m2 ha-1), the total volume is 96.47 m3 (104.86 m3 ha-1) [here calculated cone factor = 0.359822 is used], and mean annual increment (MAI) is 9.53 m3 ha-1 yr -1. Among the different planting stocks, the potted seedling plant was significantly better in growth as compared to those of other planting stocks, nonetheless, survival percentages among them were not significant. Now, we conduct this follow-up study to explore the growth performance of this 12 years old teak plantation of different planting stocks. We expect this study’s findings will be supported the useful and applicable information for the commercial plantation program to raising environmentally friendly and economically successful teak plantations. Keywords: Sustainable forest management, Deforestation and forest degradation, Research ID: 3485372 -
ArticleAssessment of enrichment planting of teak (Tectona grandis L.f.) in degraded dry deciduous dipterocarp forest in the Central Highlands, Viet Nam
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.After years of unsustainable logging, dry deciduous dipterocarp forest (DDDF) has become poor in timber stocks and has been converted to industrial crops such as rubber. The objectives of this study were to assess teak (Tectona grandis L.f.) tree establishment under degraded DDDF conditions and to determine factors that influence the suitability of teak as a forest enrichment tree species. A set of 64 experimental plots of 4900 m2 each was set up and observed for 4–5 years for testing enrichment planting with teak under various combinations of two groups of factors: ecological conditions and forest status. Weighted, non-linear, multivariate regression models were used to detect key factors that influenced the suitability of teak. The results showed that at the age of 4 years the average dominant tree height (defined as 20% of the tallest trees in the experimental plot) reached 11.2, 7.8, 5.3 and 3.8 m for very good, good, average, and poor suitability levels, respectively. Survival rates of planted teak from average to very good suitability levels were over 90%. Six key factors that affected the suitability of teak were waterlogging during the rainy season, altitude, stand volume of the degraded DDDF, soil type, percentage of sand and concentration of P2O5 in the soil. Under the extreme ecological and environmental conditions of the DDDF, enrichment planting with teak gave promising results. Keywords: degraded dipterocarp status, dipterocarp enrichment, teak suitability assessment. ID: 3472951 -
ArticleCharacteristics of growth and heartwood formation in planted teak in South China
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.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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