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" The tree as a component in the Damar agroforest system "
T. Sukandi
R. C. D. Kellison, Charles B.
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1113434
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| Doc. No
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TLpq304391209
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| Main Entry
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R. C. D. Kellison, Charles B.
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T. Sukandi
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| Title & Author
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The tree as a component in the Damar agroforest system\ T. SukandiR. C. D. Kellison, Charles B.
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| College
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North Carolina State University
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| Date
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1997
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| student score
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1997
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| Degree
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Ph.D.
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| Page No
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115
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| Abstract
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Damar agroforest is an agroforest system in which damar trees (Shorea javanica) are planted as a main species. A study on damar agroforests was conducted in Pesisir areas (Krui), West Lampung, Indonesia, to determine the changes of tree species composition over time, the relationships of tree dominance and damar agroforest stage with soil conditions, and to estimate the yield of damar resin. Results of the study indicate that the composition of tree species, which were evaluated with Importance Value (IV) index, changes over time. Soil parameters of clay portion, pH value, Ca, Mg, and base saturation (BS) are considered to be potential factors for the changes in composition of tree species. Identification of plant community in the study areas recognizes four types of damar agroforest: (1) high, with damar tree IV 172% to 263%, (2) medium, with damar tree IV 98% to 168%, (3) low, with damar tree IV 40% to 75%, and (4) very low, with damar tree IV 0% to 20%. Determination of the relationship between tree dominance, counted in basal area, and soil conditions shows that pH values tend to decrease until basal areas of 23 to 32 m2/ha are reached. Concentrations of total P and available P tend to decrease until basal areas of 26 and 40 m2/ha are reached, respectively. This suggests that trees might have a positive effect on soil conditions beyond those levels. The relationship between stage of damar agroforests and soil conditions indicates that some soil parameters, such as Ca, exchangeable K, base saturation (BS), and pH values have negative relationships with stage factor until Stage 4 (30 years old) is reached, and then the relationships become positive beyond this stage. This result suggests that an improvement of soil conditions might occur beyond the age of about 30 years. The range of average yields of damar resin in Panengahan village is 166 g to 905 g/tree/month or 15.04 kg to 129.03 kg/ha/month. Damar agroforest type, stage, elevation, total-tree-species density, tapped-damar-tree density, and time of tapping in certain soil conditions can be potential factors affecting the yield of damar resin.
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agroforestry
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Biological sciences
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Ecology
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Forestry
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Indonesia
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Shorea javanica
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