| Budget Amount *help |
¥3,710,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥510,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Research Abstract |
The effects of nitrogen depositions on organic matter contents in forest soils, the large reservoir of carbon, was examined, focusing on enzymes involved in decomposition of soil organic matter. It is suggested that the nitrogen input lowers the polyphenol oxidase activity, which facilitates the degradation of soil organic matter, in a forested Andisol. This decline may be due to the increased phosphorus limitation for polyphenol oxidase-producing microorganisms with an inferior competitive ability in Andisols having high capacity for phosphorus sorption.
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