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Utilization of woody biomass as a carbon neutral energy source is recognized as one of important means of restoring maintenance of suburban satoyamas. The existing maintenance by local citizen groups should not be overlooked. This study set a suburban community in the Tokyo metropolitan area as a case study and estimated the amount of harvestable woody biomass from suburban satoyamas by local citizen groups. The standard units of harvestable woody biomass were determined by measuring arisings through the citizen maintenance. Then, the maintenance scenario covered whole satoyamas in a case study city was developed and the standard units were applied. The amount of harvestable woody biomass were then estimated and evaluated as a renewable energy resource. Our results showed that 999dry-t/yr of woody biomass were harvestable as whole years in the case study. It is estimated that the rate of the satoyamas districts where 10% and more of the heating demanded reaches 20%. Furthermore, in a number of the districts in the north area where many satoyamas still keep, it was calculated that the value exceeds 50%. Based on the results we conclude even though the amount of harvestable woody biomass from suburban satoyamas by local citizen groups already have the potential of the energy resource in a community, if those activities are positioned as a part of regional management, it can play more important parts in satoyamas conservation.

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木材を用いた家の価値が見直されている中で，木材から放散される揮発性成分の機能性が注目されている。季節ごとの温度や湿度の変化の大きい我が国においては，木材から放出される揮発性成分も大きく変化していると考えられる。本研究では，スギ（Cryptomeria japonica）の無垢材を内装に用いた建物（A棟）と，表面に塗装を施された内装材またはビニールクロスで覆われた内装材を用いた建物（B棟）の室内において，年間を通して揮発性成分を定期的に捕集し，ガスクロマトグラフ質量分析計（GC/MS）分析による比較を行った。その結果，木材の揮発性成分の大半を占めるセスキテルペン類の量は，どちらの棟においても冬季より夏季で高く，年間を通してB棟よりもA棟の方が常に高いことが明らかになった。

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Confronted with global climate change and steadily rising energy costs, the formation of a “Low Carbon Society” has become imperative. In this endeavor, green space maintenance and subsequent utilization of harvested biomass has an important role to play. Green space maintenance serve to fix carbon (CO2), while woody biomass provides an essentially carbon neutral alternative energy source. In this study, we estimated the amount of carbon fixation and reduction in Kashiwa city, a suburban area of Tokyo, Japan based on three maintenance scenarios; a) “carbon fixation”, b) “biomass utilization and carbon fixation”, and c) “intensive biomass utilization”. Since various types of biomass resources are found in suburban areas, we assumed a mixed biomass utilization scenario which takes advantage of scale and enables cost-savings. Our results indicate that a total of 6,000-6,500 CO2 - t/yr could be fixed and reduced. In addition, we found that the different maintenance scenarios had negligible effect on the outcomes. The results of this research provide critical insight into how green space maintenance planning might not only enhance carbon fixation, but also reduce carbon emissions if appropriate woody biomass utilization methods can be implemented.

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