Survival of Pinus densiflora and P. thunbergii Forests in Ibaraki Prefecture Severely Damaged by Bursaphelenchus xylophilus
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概要
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The total area of Pinus densiflora and P, thunbergii forests in Ibaraki Prefecture in 1978 was 65,200 ha, which decreased to 30,300 ha by 1985 mainly due to pine wilt mortality caused by Bursaphelenchus xylophilus. This damage has also continued thereafter. To estimate the survivability of pine trees in Ibaraki Prefecture, pine tree mortality has been studied in eight experimental forests for over 20 years, and ground surveys throughout the Prefecture were also conducted in 1995. Survival in the experimental forests corresponded well to the results of ground surveys. Pine forests remained as pure stands if control measures were undertaken or if they were located in cool areas. In warm areas where no control was undertaken, most of the pine forests disappeared and only a few pine trees remained in mixed forests, while on dry soils no mature or old pine trees survived. Since surviving pine forests are often cut for wood utilization, P. densiflora and P. thunbergii may decrease in area to become rare species in the future unless controls are applied and/or reforestation with resistant pines is carried out.
- 一般社団法人日本森林学会の論文
- 1999-11-16