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DocumentMorphometrics of Pinus patula crown and its effect on cone characteristics and seed yield in Kenya
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Tree crowns for conifers have been known globally to be the epicentre of seed production. Pinus species and other conifers have cones as an important unit for seed production. Cone production is however not uniform and often varies among compartments and sectors within the crown. This study sought to evaluate within-crown cone production patterns, cone characteristics and seed yield in a Pinus patula clonal seed orchard in Londiani, Kenya. Crown height was divided into 3 equal portions and a further subdivision done for each of the portions into 2 sections. From each crown section 10 mature cones were collected to total 60 cones per tree as a sample size. The cones were put in a preheated oven at temperature 65°C for 24 hours to open for seed extraction. This study observed cones collected from the top portion of the crown yielded the highest amount of seed (33.3±4.91 seeds) (p<0.05) while the bottom part had the lowest (14.4±2.76) (p<0.05). The study recommends collection of Pinus patula seeds from the upper part of the crown in unmanaged stands and further recommends that management through pollarding be done regularly to minimize within-crown differences. Keyword: Research ID: 3469693 -
DocumentThe early growth performances of Pinus densiflora and Larix kaempferi seedlings under open-field experimental warming and precipitation manipulation
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.This study aimed to investigate the effects of climate change on the survival and growth performance of Pinus densiflora and Larix kaempferi seedlings using open-field experimental warming and precipitation manipulation. We measured the survival rate, root-collar diameter, and height, and then calculated the seedling quality index (SQI) of 2-year-old seedlings under 6 treatments [2 temperatures (TC: Control; TW: Warming) × 3 precipitation manipulations (PC: Control; PD: Decreased; PI: Increased)] and performed a two-way ANOVA to test for differences. The air temperature of the warming plots was 3°C higher than that of the control plots, while the precipitation manipulation plots received ±40% of the precipitation received by the control plots. Temperature and precipitation treatments did not significantly affect the survival rate of P. densiflora; however, the SQI of P. densiflora decreased with increasing precipitation. In contrast, the mortality rate of L. kaempferi increased with increasing temperature and decreasing precipitation. Furthermore, in L. kaempferi, TC × PI treatment resulted in the lowest SQI with a significant interaction effect observed between the two factors. In summary, low seedling production and quality should be expected in P. densiflora as precipitation increases and in L. kaempferi as temperature increases or precipitation decreases. These results indicate species-specific sensitivities to climate change of two plant species at the nursery stage. With the occurrence of global warming, the frequencies of drought and heavy rainfall events are increased, and this could affect the survival and seedling quality of tree species. Therefore, it is necessary to improve nursery techniques by establishing new adaptation strategies based on species-specific growth performance responses. 1) Keywords: Climate change ID: 3622385 -
ArticleEfficacy of biological control measures on pine needles caterpillar Metanastria latipennis walker in Pinus kesiya royel ex Gordon Plantation in Southern Shan State, Myanmar
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The study was carried out to investigate the efficacy of Bacillus thuringiensis sub sp. kurstaki (Btk), bio insecticide Azadirachtin and established natural enemies (Mantids) on Metanastria latipennis in Pinus kesiya Plantation in Southern Shan State of Myanmar. The experiment was conducted in pine plantations established in 2010 in Taung Lay Lone Reserved Forest, Taungyi Township, at about latitude 25˙ 40' N and longitude 96˙ 51' E at an altitude of approximately 1160 m. Research was conducted from May, 2017 to August, 2019. A Randomized Complete Block Design (RCBD) was used with four replications. Each block containing the four treatments randomly assigned to test the effect of Btk, Azadirachtin, released the Mantids on pine caterpillar Metanastria latipennis. Sampling was done on a sample plot measuring 20m x 20 m with 20 sample trees. In control measures, (i) 30 ml of Btk per 10 litres of water, (ii) 0.75 % Azadirachtin 112.5 ml per 10 litres of water, (iii) biological control (established the mantids), and (iv) control were tested. In this experiment, Btk and Azadirachtin treatments significantly reduced the level of infestation compared to the control. Biological control by predators was not significantly different with the control. Keywords: Pinus kesiya plantations, caterpillar Metanastria latipennis, Bacillus thuringiensis sub sp. kurstaki, Azadirachtin, Bio control agent (Mantises), Southern Shan State, Myanmar ID: 3486963
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