| Project/Area Number |
06451168
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
NAKANE Kaneyuki Hiroshima U.Fac.Integr.Art.& Sci., Professor, 総合科学部, 教授 (00116633)
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| Co-Investigator(Kenkyū-buntansha) |
SEKI Tarou Hiroshima U.Fac.Sci., Professor, 理学部, 教授 (90033860)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1994: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Air pollution / Forest decline / Leaf longevity / Acid rain and fog / Pine blight / NO_2 / Seto Inland Sea / Slope |
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| Research Abstract |
The spatial concentration distribution was investigated on the southern and northern slopes of Mt. Gokurakuji, Hiroshima Prefecture.
The concentration at vertical intervals of 50m or 100m was measured using short-and long-term exposure methods. A high concentration of NO_2 was detected at an altitude of 100-200m on the southern slope where the atmosphere was comparatively polluted, and the concentration decreased with increasing altitude. However, the concentration was constantly low on the northern slope, where air pollution had not reached an advanced stage. It was estimated that the NO_2 concentration was closely related to land and seabreezes. The vital degree of severaltree species was investigated. The mortality of Pinus densiflora, the leaf shooting rates and mortality of Prunus spp.and the leaf shedding rates of Eurya japonica were used at the same sites where NO_2 measurement was conducted. Consequently, it was found that the mortality and leaf shedding rates were higher in areas of low altitude on the southern slope, and that damage was increased to pine forests. The leaf shooting rates of Prunus spp.was not closely correlated with NO_2 concentration, although the mortality showed a clear differ ence between on the southern and northern slopes.
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