| Project/Area Number |
02041070
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | Osaka City University |
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Principal Investigator |
YODA Kyoji Osaka City University, Faculty of Science, Professor, 理学部, 教授 (80046937)
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| Co-Investigator(Kenkyū-buntansha) |
DHANMANONDA Pricha Kasetsart University, Faculty of Forestry, Assoc. Prof., 林学部, 助教授
SAHUNALU Pongsak Kasetsart University, Faculty, of Forestry, Assoc. Prof., 林学部, 助教授
KANZAKI Mamoru Osaka City University, Faculty of Science, Research Associate, 理学部, 助手 (70183291)
SAKURAI Katsutoshi Kochi University, Faculty of Agriculture, Assoc. Prof., 農学部, 助教授 (90192088)
YONEDA Tsuyoshi Osaka University of Education, Faculty of Education, Assoc. Prof., 教育学部, 助教授 (40110796)
ARAKI Shigeru Kyoto University, Center for African Studies, Assoc. Prof., アフリカ研, 助教授 (00158734)
IWATSUBO Goro Kyoto University, Faculty of Agriculture, Professor, 農学部, 教授 (00026395)
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| Project Period (FY) |
1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Eucalyptus camaldulensis / Fast-growing species / Reforestation / Productivity / Soil conditions / Respiration rate / Transpiration rate / Shifting cultivation / Land after tin mining |
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| Research Abstract |
Soil-plant system in the fast-growing Eucalyptus camaldulensis plantations was monitored in experimental plots set on tropical waste land after tin mining and sifting cultivation, for 6 years, from 1984 to 1989.
E. camaldulensis could established and grew vigorously except sand sediment area after tin mining, where the root penetration was seriously inhibited by dense sand layer, and tree growth was inhibited by severe soil water conditions and poor soil nutrients. In this area, biomass of the plantationattained to only 1.53 t/ha without treatment, and increased to 11.18 t/ha with mulching treatment by Imperata grass, and 44.54 t/ha with the dressing of clay soil in transplanting hole. Survival ratio of the trees was highest in the mulching treatment plot. Mulching treatment was recommended because of its effect on survival of trees and on the improvement of soil environment. The mulching treatment also increased the yield of cassava and pineapple in this area. However the agricultural and silvicultural utilization of the area is not impossible and rehabilitation of the soil by establishing t he vegetation with mulching treatment was recommended.
Biomass of E. camaldulensis plantation attained to 36.83 t/ha on laterite soil caused by heavy cutting, in west Thailand, and to 78.28 t/ha on sandy loam soil after shifting cultivation. Wood production seemed to be available in these area.
At least, with in one rotation time, no serious soil fertility degradation was observed in E. camaldulensis plantation. However, its high transpiration rate and water consumption will bring a deterioration of the water conditions and physical structure of the soil in loamy sand soil of northeast Thailand.
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