Browsing by Subject "Eucalyptus camaldulensis"

Sort by: Order: Results:

Now showing items 1-3 of 3
  • Niskanen, Anssi; Luukkanen, Olavi; Saastamoinen, Olli; Bhumibhamon, Suree (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1993)
    The profitability of fast-growing trees was investigated in the northeastern and eastern provinces of Thailand. The financial, economic, and tentative environmental-economic profitability was determined separately for three fast-growing plantation tree species and for three categories of plantation managers: the private industry, the state (the Royal Forest Department) and the farmers. Fast-growing tree crops were also compared with teak (Tectona grandis), a traditional medium or long rotation species, and Para rubber (Hevea brasiliensis) which presently is the most common cultivated tree in Thailand. The optimal rotation for Eucalyptus camaldulensis pulpwood production was eight years. This was the most profitable species in pulpwood production. In sawlog production Acacia mangium and Melia azedarach showed a better financial profitability. Para rubber was more profitable and teak less profitable than the three fast-growing species. The economic profitability was higher than the financial one, and the tentative environmental-economic profitability was slightly higher than the economic profitability. The profitability of tree growing is sensitive to plantation yields and labour cost changes and especially to wood prices. Management options which aim at pulpwood production are more sensitive to input or output changes than those options which include sawlog production. There is an urgent need to improve the growth and yield data and to study the environmental impacts of tree plantations for all species and plantation types.
  • Valo, Mirka (Helsingfors universitet, 2014)
    Rice, cassava and eucalypts are important species for Thailand's economy and they are widely used in agroforestry systems in Thailand. In this research the studied agroforestry systems were boundary planting and alley cropping with rice, cassava and eucalypts, but there are also many other systems in use in Thailand. Rice is the most important crop in the world and also in Thailand and the demand of rice is increasing due to the population growth. Cassava has been an important plant in Thailand and also the demand of cassava is growing due the new potential industries. The amount of forests in Thailand has decreased from the 1960's while deforestation still continues due to that the planting of eucalypts is promoted for reforestation purposes. Also the demand of eucalypts is increasing because the consumption of paper is growing with the economic growth of Asian countries and due to the logging ban on natural forests in Thailand since 1989. Due to that contract farming of eucalypts is critical for pulp and paper industry and it has been increasing. The aim of this study was to find out the reasons why farmers have chosen agroforestry and what are the advantages and disadvantages of the used systems. The research was semi-structured interview and it was conducted with 25 farmers. Confirmative results on factors affecting farmer's adoption, continuation and experience on benefits of agroforestry did not emerge from the data. Farmers mentioned most often availability and suitability of the land, own experiences and knowledge as the reason for adoption. Farmers saw agroforestry as a way to increase their income, improve profitability and diversify their production. Most of the farmers were going to use agroforestry systems also in the future.
  • Luangjame, Jesada (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1990)
    In a study of two salt-tolerant tree species, Combretum quadrangulare and Eucalyptus camaldulensis, results from a greenhouse experiment with NaCl salinity of 0, 0.5, 1.0, 1.5 and 2.0% were compared with those of a field study on non-saline and saline soils in north-eastern Thailand. Determination of optimum gas exchange and development and evaluation of photosynthetic models with and without water deficit were included. Shoot height and diameter growth, shoot internode length, root length/biomass, leaf width and length, leaf area, number and biomass, and shoot:root and leaf:root ratios decreased with salinity, while leaf thickness increased with salinity. More growth occurred in roots than in the leaf canopy. In the laboratory, photosynthesis, stomatal conductance and water potential decreased with salinity, while CO2 compensation point increased with salinity. Transpiration, dark respiration and photorespiration increased at low salinity but decreased at high salinity. In the field study, however, there were no significant differences in stomatal conductance and opening between saline and non-saline soils. Model predictions supported results of the field measurements. Adaptation of salinity was reflected in an acclimatization of tree structure in the field study. There were both functioning and structural changes of seedlings in the greenhouse experiment. In terms of ecophysiological and morphological characteristics, E. camaldulensis showed better salt tolerance than C. quadrangulare in both the greenhouse experiment and field study.