Abstract
The possibility of restoring natural broadleaf forests may be decreased by the effects of plantation management, particularly in sites that undergo repeated rotation. We investigated the following two working hypotheses about the effects of repeated plantation of conifers on the natural regeneration of woody saplings in cool-temperate Japanese cedar plantations: (1) that repeated plantation of conifers decreases sapling species richness, and (2) that repeated plantation of conifers changes sapling species compositions. Our result supported the first hypothesis, because species richness was significantly lower in second-rotation plantations than in first-rotation plantations. The second hypothesis was not supported, because no significant or substantial differences in species composition were observed between plantations with different numbers of rotations. However, the abundance of tree (nonshrub) and gravity-dispersed species decreased after the second rotation of large saplings, albeit not those of small saplings, suggesting that response to repeated rotation depended on sapling size. Our results suggest that it is important to consider factors affecting the maintenance of a species in the plantations, such as distance from natural forests and seed sources, to minimize the effects of repeated plantation.
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Acknowledgments
We thank H. Sugita, H. Tanouchi, K. Niiyama, M. Shibata, T. Katsuki, H. Tobita, and K. Yazaki (FFPRI) for their field support and helpful suggestions on a draft of this manuscript. This study was supported by the Research and Development Projects for Application in Promoting New Policy of Agriculture, Forestry, and Fisheries, which is funded by the Ministry of Agriculture, Forestry, and Fisheries of Japan. This research was also supported by the Environment Research and Technology Development Fund (1-1401) of the Ministry of the Environment, Japan.
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Igarashi, T., Masaki, T., Nagaike, T. et al. Species richness of the understory woody vegetation in Japanese cedar plantations declines with increasing number of rotations. J For Res 21, 291–299 (2016). https://doi.org/10.1007/s10310-016-0537-2
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DOI: https://doi.org/10.1007/s10310-016-0537-2