2013 Fiscal Year Final Research Report
Afforestation on degraded tropical land and isotopic chronology analysis of soil carbon
| Project/Area Number |
22405026
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Forest science
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| Research Institution | Forestry and Forest Products Research Institute |
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Principal Investigator |
SAKAI Masaharu 独立行政法人森林総合研究所, 立地環境研究領域, 主任研究員 (00353699)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Naoki 京都大学, 地球環境学堂, 准教授 (40335302)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | 熱帯季節林 / 草地 / 人工林 / 炭素プール / 炭素安定同位体比 / 土壌 / バイオマス |
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| Research Abstract |
The study site was located at Sakaerat Silvicultural Research station , Nakhon Rachasima Province, Northeast Thailand. In this site, we have been monitoring the biomass in the plantation. The object in this paper is to estimate the carbon stock changes by afforestation on grassland during 1986 to 1998 and 2012.
The biomass(Above-ground part and the roots ) increased with growth, and the annual increasing values was calculated with 5 - 7tC/ha/ year in fast growing trees. On the other hand, the soil carbon decreased about 30tC/ha in comparison with grassland. Therefore, we estimated that in the fast growing trees, the carbon of 3.1-4.7 tC/ha/year was fixed in this area by afforestation. And by isotope analysis, we found that almost soil carbon in the depth of 0-5cm in the exotic first-growing plantation was changed to plantation-derived carbon from grass-derived carbon for 24 years.
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