Seeding experiments to use native unpalatable plants for revegetation in sika deer-grazed areas in the Chichibu mountains
五十嵐, 勇治 ,
高徳, 佳絵 ,
吉田, 弓子 ,
木村, 恒太鈴木, 智之
東京大学農学部演習林報告 = Bulletin of The University of Tokyo Forests
64 , 2018-03-08 , 東京大学大学院農学生命科学研究科附属演習林
In this study, seeding experiments were used to develop a revegetation technique that uses unpalatable plant species native to the Chichibu Mountains, where vegetation is heavily grazed by sika deer. In November 2014, seven unpalatable and three palatable plant species were seeded both outside and inside the sika deer exclusion fences in bare land areas in the University of Tokyo Chichibu Forest. Vegetation surveys were conducted in September 2015. One year after seeding, the effects of the fence were prominent on the vegetation cover, whereas the effects of seeding were very limited. The unpalatable weeds Microstegium vimineum and Muhlenbergia japonica densely covered the fenced plots and, although their cover was considerably lower in the unfenced plots, it was more than 10% in some quadrats. Therefore, both M. vimineum and M. japonica may be suitable species for rapid revegetation if the effect of deer herbivory can be reduced. Seeding with tree species had little effect on the vegetation cover due to their low germination rates. However, the unpalatable tree species Pterostyrax hispida germinated in several quadrats and even survived in unfenced plots. Therefore, P. hispida may also be useful for forest revegetation if its germination rates can be improved.