Status of riparian management zone and impacts of its preservation on forestry: Case study of Mt. Iwate and the surrouding area, Iwate prefecture [Japan]
2005
Kuboyama, H.(Forestry and Forest Products Research Inst., Tsukuba, Ibaraki (Japan)) | Nishizono, T. | Ohishi, Y. | Awaya, Y. | Furuido, H. | Amano, T. | Tanaka, K. | Yokota, Y.
On Mt. Iwate and the surrounding area, vegetation of the riparian management zone and impacts of its harvest restriction on forestry were examined by using Digital Topographical Map 25000, Digital Vegetation Map, and digital forest resources data. The riparian management zone (RMZ) was set up with buffering from permanent channels and lakes. RMZ shared 4% and 11% under buffer width of 15 m and 50 m respectively. In RMZ outside forest planning area, the riparian forest should be restored because a few forests currently existed there. In the RMZ inside forest planning area, the ratio of plantation forest was lower than in the whole area. However, non-national forests in RMZ needed to be preserved since in many forest stands their age was not high enough. Forest stands including RMZ were generally located near road and many of them had a high ratio of RMZ area to whole stand area. Present restriction to those stands is very inattentive. If the harvest in RMZ is prohibited, compensation for the restriction would become a higher value as the buffer width would be wider. On the other hand, RMZ was fragmented in cases where small stands would be exempted. Therefore, to introduce RMZ harvest restriction efficiently, a narrower RMZ width and moderate restriction would be appropriate for non-national forests.
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