Soil methane (ch4) and nitrous oxide (n2o) fluxes in selected forest stand and oil palm plantation in Sabah

• 第一著者: Jambery Siong
• フォーマット: 学位論文
• 言語: 英語; 英語
• 出版事項: 2014
• 主題: TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution
• オンライン･アクセス: https://eprints.ums.edu.my/id/eprint/43366/1/24%20PAGES.pdf; https://eprints.ums.edu.my/id/eprint/43366/2/FULLTEXT.pdf

In spite the huge tropical forest exploration and conversion in Asian region, less study has been done to evaluate the magnitude, temporal, and spatial patterns of GHG fluxes from soil especially land use conversion in Malaysia which contributed the largest supply of palm oil product in the world. Thus, this study has been conducted to investigate the rate of CH4 and N2O fluxes from primary forest (PF), secondary forest (SF), heavily disturbed forest (DF), fertilized area (F) and unfertilized area (NF) in matured oil palm plantation area. The study indicated that, all selected sites, except DF site, emitted higher CH4 compared with the PF site, with the largest emission are released from SF site at 13 μg CH4 m-2 h-1 of mean fluxes. N2O emission are also indicated increase in all deforested and converted area in comparison with the PF site, with the largest fluxes emitted from the F area at 6500.64 μg N2O-N m-2 h-1 of mean fluxes. Conclusively, the increased of GHGs fluxes after deforestation and conversion are related to the change in land cover and application of N fertilizer. Deforestation change the respond of the key-factor that controlling the magnitude of GHGs fluxes, while the application of N fertilizer inhibited the soil CH4 uptake and induced the production of atmospheric emission from the soil system. Thus, proper mitigations are needed to reduce the impact of the deforestation to the soil environment. Proper management on N fertilizer should also implemented or in another way, to change the type of the fertilizer are also appropriate to minimize the rate of GHGs fluxes from the agriculture system.