2006 Fiscal Year Final Research Report Summary
Mechanisms of soil acidification under leguminous fast growing tree plantations in the humid tropics and its prediction
| Project/Area Number |
15255014
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
林学・森林工学
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| Research Institution | Kyoto University |
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Principal Investigator |
OHTA Seiichi Kyoto University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (10346033)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEDA Hiroshi Kyoto University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (60109048)
KANZAKI Mamoru Kyoto University, Graduate School of Agriculture, Associate Professor, 農学研究科, 助教授 (70183291)
TANAKA Nagaharu Forestry and Forest Products Research Institute, Team leader, 北海道支所, 研究チーム長 (60353760)
KANEKO Takayuki Kyoto University, Graduate School of Agriculture, Instructor, 農学研究科, 助手 (20233877)
ISHIZUKA Shigehiro Forestry and Forest Products Research Institute, Senior Researcher, 北海道支所, 主任研究員 (30353577)
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| Project Period (FY) |
2003 – 2006
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| Keywords | humid tropics / soil acidification / leguminous fast growing tree / industrial tree plantation / Acacia mangium / elements cycling / nutrients pool / forest ecosystem |
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| Research Abstract |
This study was conducted in the Acacia mangium plantation in the Province of South Sumatra, Indonesia for the purpose of elucidating the possibility of soil acidification caused by establishment of leguminous fast growing tree plantation in the humid tropics and its mechanism, and to develop the methodology to predict the acidification. The progresses obtained are the followings.
1)Based on the multipoint soil survey covering relatively large area, we illustrated in an empirical way that conversion of degraded Imperata grassland into Acacia tree plantation causes obvious soil acidification, and the decline in exchangeable base cations in soils resulted from nutrients trans location from soil to growing tree biomass is the major cause of the acidification. Furthermore, it was indicated that effective cation exchange capacity of the humid tropical soils containing minerals of variable charge characteristics might decline with soils acidification, and it may possibly accelerate further soi
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l acidification.
2)For the two 7-year-old Acacia stands respectively on a heavy clay soil and a light clay soil, allometry formulas were developed by destructive measurements, and nutrients concentrations were determined for every organ of trees. Based on these information, nutrients export through tree harvest was estimated, and possible number of replanting-harvest rotation was simulated on a supposition that nutrients is input only through precipitation. The results of simulation suggested that Ca and K will become deficient in near future and its magnitude is different by the soil characteristics especially clay content.
3)Nutrients transported by litterfall, throughfall, stemflow and water percolation through litter layers (Ao horizon, 0 horizon), and nutrients and dissolved organic matter released from litter decomposition were monitored for 3 years at the permanent plot, and the results showed every related parameters display obvious seasonality between drier and wetter seasons mostly in conjunction with each other.
4)A model to predict the soil acidification was formulated based on ion balance and mass balance, and soil change during a period of three rotations was predicted by using data collected by field observation. The simulation output by the model indicated possible rapid and significant soil acidification, however also it became clear that the model still have weakness to be improved. Less
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Research Products
(42 results)
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[Book] 森林保護学2004
Author(s)
太田誠一(共著)
Total Pages
280
Publisher
朝倉書店
Description
「研究成果報告書概要(和文)」より
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