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Removal of competitive native species combined with tree planting can accelerate the initial afforestation process: an experiment in an old field in Japan invaded by dwarf bamboo and kudzu

引用

Journal of Forestry Research 2015年第3期26卷 581-588页

作者： Yoshinori Tokuoka Kentaro Ohigashi Koji Watanabe Hiroshi Yamaguchi Takahiro Ara Nobukazu Nakagoshi Biodiversity Division National Institute for Agro-Environmental Sciences 3-1-3 Kannondai TsukubaIbaraki 305-8604 Japan Ecosystem Informatics Division National Institute for Agro-Environmental Sciences 3-1-3 Kannondai TsukubaIbaraki 305-8604 Japan Experimental Farm Management Division National Institute for Agro-Environmental Sciences 3-1-3 KannondaiTsukuba Ibaraki 305-8604 Japan Graduate School for International Development and Cooperation Hiroshima University 1-5-1 KagamiyamaHigashi-Hiroshima 739-8529 Japan

Restoring natural forests after field abandon- ment is a land management objective that fosters the re- covery of forest biodiversity. We performed seeding and transplanting of native tree species 40 years after the abandonment of an arable field that became dominated by a dwarf bamboo （Pleioblastus chino （Franch. et Sav.） Makino） and by kudzu （Pueraria lobata （Willd.） Ohwi）. By permutation tests, the removal of competing vegetation （gap creation） significantly increased the survival of three seeded species of Fagaceae and of eight transplanted spe- cies. In contrast, intact vegetation prevented most indi- viduals of all species from surviving for 1 year after planting. The lack of natural recruitment of Fagaceae in the nonseeded subplots indicated that seed limitation was a cause of the slow afforestation. Although litter accumula- tion in gaps at the time of seeding slightly increased sur- vival for late-germinating Quercus myrsinifolia Blume andCastanopsis sieboldii （Makino） Hatus. ex T. Yamaz. et Mashiba, the effect was not consistent among plots and was not statistically significant. Our results suggest that for successful afforestation using native trees in abandoned fields, it will be necessary to remove competitive native species to avoid severe limitations on microsite availability and that simultaneous tree establishment by seeding or transplanting should be implemented to accelerate the establishment of native tree species.

关键词： Farmland abandonment - Micrositelimitation Pleioblastus chino Pueraria lobata treeseedling

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