| Budget Amount *help |
¥38,220,000 (Direct Cost: ¥29,400,000、Indirect Cost: ¥8,820,000)
Fiscal Year 2012: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2011: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Fiscal Year 2010: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
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| Research Abstract |
In the Asian tropics tree plantation with leguminous fast growing species is expanding recently, and leguminous fast-growing tree species like Acacia mangium have been widely introduced. However, based on the our precedent study it was indicated the soil under leguminous tree plantation emit more nitrous oxide (N2O) than those under other species forests because of larger amount of nitrogen cycling in a soil-plant system due to symbiotic nitrogen fixation. In this research project we investigated the following two topics in large-scale industrial plantation in South Sumatra, Indonesia in order to propose possible options to mitigate the N2O emission; 1) effect of phosphorous application to N2O emission from Acacia stand, and 2) evaluation of global mitigation effect of Acacia plantation forest with phosphorous application.The results obtained were as follows. (1) Phosphorous application stimulated N2O emission from soil under the condition without plant roots, meanwhile it reduced the emission wh en Acacia mangium roots exist and uptake nutrients through accelerating nitrogen uptake by the plant. (2) Application of phosphorous to newly planted Acacia plantation strengthened the global warming mitigation function by suppressing N2O emission from soi l and promoting biomass production of planted trees, while decomposition of soils organic carbon was higher than in the stand without phosphorous application.
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