Survival ofPinus densiflora andP. thunbergii forests in Ibaraki Prefecture severely damaged byBursaphelenchus xylophilus |
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| Authors: | Yoichi Kishi |
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| Institution: | (1) University Forests, Tokyo University of Agriculture and Technology, 183-8509 Fuchu, Japan |
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| Abstract: | The total area ofPinus densiflora andP. 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 byBursaphelenchus 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 andP. 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.
A part of this paper was orally presented at the 108th Annual Meeting of the Japanese Forestry Society (1997). |
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| Keywords: | Bursaphelenchus xylophilus pine tree mortality Pinus densiflora P thunbergii survival of pine forests |
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