Abstract
To elucidate the expansion of bamboo (Phyllostachys pubescens Mazel ex Houzeau de Lehaie) forests, we used multiple linear regression analysis and determined whether there were site differences for data obtained in Hirasawa, Otaki-machi, Chiba Prefecture, and Kofuki, Takehara City, Hiroshima Prefecture, Japan. Vegetation maps from 1984 and 2001 for Hirasawa, and from 1986, 1996, 2000, and 2006 for Kofuki, were compared, and the annual expansion rate of each P. pubescens forest was calculated. We evaluated nine indices, including original bamboo forest area, neighbouring vegetation, slope inclination and aspect, distance from roads, and shipment of bamboo shoots. Shipment of bamboo shoots was a positive factor for P. pubescens forest expansion, whereas the proportion of adjacent short vegetation, northness (the cosine of slope aspect), and area negatively affected the expansion in Hirasawa (R 2 = 0.683). On the other hand, distance from roads and eastness (the sine of slope aspect) positively affected expansion, while slope inclination was a negative factor in Kofuki (R 2 = 0.942). We calculated that P. pubescens forests expanded at about 2% per year in regions of reduced shipments of bamboo-shoot harvest. We showed that not only natural conditions but also management factors affect P. pubescens forest expansion. Regional differences in natural and anthropogenic effects on expansion were also found.
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Acknowledgements
We are indebted to Prof. Sadao Takaoka of Senshu University for suggestions regarding research techniques at Hirasawa. We thank Dr. Akira Kikuchi, Mr. Yoshikazu Isozaki, and Mr. Eutiquio de Leon Rotaquio, Jr., of Hiroshima University, for their help. We are also grateful to the residents of Hirasawa and Kofuki for the information provided during our interviews. Finally, we thank Dr. Louis R. Iverson of the United States Department of Agriculture Forest Service for his valuable comments on an earlier draft of the manuscript.
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Suzuki, S., Nakagoshi, N. Expansion of bamboo forests caused by reduced bamboo-shoot harvest under different natural and artificial conditions. Ecol Res 23, 641–647 (2008). https://doi.org/10.1007/s11284-007-0422-8
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DOI: https://doi.org/10.1007/s11284-007-0422-8