Responses of community structure,diversity, and abundance of understory plants and insect assemblages to thinning in plantations |
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Authors: | Hisatomo Taki Takenari Inoue Hiroshi Tanaka Hiroshi Makihara Masahiro Sueyoshi Masahiro Isono Kimiko Okabe |
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Affiliation: | 1. Department of Forest Entomology, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan;2. Tama Forest Science Garden, Forestry and Forest Products Research Institute, Hachioji, Tokyo 193-0843, Japan;3. Forest Ecosystem Research Group, Kyushu Research Centre, Forestry and Forest Products Research Institute, Kumamoto, Kumamoto 860-0862, Japan;4. Forest Zoology Group, Kyushu Research Centre, Forestry and Forest Products Research Institute, Kumamoto, Kumamoto 860-0862, Japan;5. Forest Health Group, Tohoku Research Centre, Forestry and Forest Products Research Institute, Morioka, Iwate 020-0123, Japan |
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Abstract: | Identifying effective management operations for plantations is important for conservation of biodiversity in a plantation-dominated landscape. We tested whether pre-commercial thinning influenced community structures and could be an effective strategy for increasing diversity and abundance of plants and animals in plantations. We designated thinned and unthinned study stands in Japanese cedar (Cryptomeria japonica) plantations and compared the communities of understory vegetation, bees, butterflies, hoverflies, and longhorn beetles 1 and 3 years after thinning. The analyses of vegetation showed that pre-commercial thinning affected community structure, but species richness and vegetation abundance were not significantly affected. Thinning affected insect community structure, and both species richness and abundance of all insect groups increased 1 year after thinning. However, 3 years after thinning, significant differences only remained in the species richness of bees and the abundance of bees, butterflies, and hoverflies. These results suggest that pre-commercial thinning in plantation stands influences the community structure of understory vegetation and can be an effective way to increase the diversity and abundance of some insect groups in the short term. However, the results also suggest that the duration of the operational effects of pre-commercial thinning varies among insect groups; thus, the variable effects of pre-commercial thinning should be carefully considered in the conservation-based management of plantation stands. |
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Keywords: | Apoidea Cerambycidae Malaise trap Syrphidae Hymenoptera Lepidoptera Diptera Coleoptera Cryptomeria japonica Understory Longicorn |
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