Impacts of land-use history on the diversity of a riparian forest landscape in warm-temperate Kyushu,southern Japan |
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Authors: | Tae Sato Satoshi Ito Yasushi Mitsuda Norihisa Soen |
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Institution: | (1) Graduate School of Agricultural Science, University of Miyazaki, Miyazaki 889-2192, Japan;(2) Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan;(3) Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan; |
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Abstract: | We examined the impacts of land-use history on the species composition and diversity of a warm-temperate riparian forest landscape
in Kyushu, southern Japan, focusing on the relationship between evergreen oaks and deciduous trees in natural and seminatural
forests. The species composition of 59 plots was classified into four types (A to D). Type A, which showed a significant bias
towards sites not subject to nonforest land use since 1947, had high species diversity consisting of (1) many lucidophyllous
components of the region, including the rare indigenous oak Quercus hondae, and (2) summergreen tree species of varying dominance and number representing unique or locally rare elements of the riparian
landscape in this warm-temperate region. Type B was dominated by a common species of oak, Q. glauca, and displayed less clear distribution bias with land-use history. In contrast to types A and B, types C and D, which were
characterized by high dominance of deciduous trees, had negative bias away from sites that had been under forest land use
in 1947. Presumably, intensive anthropogenic disturbances associated with nonforest land uses had expanded the habitats for
deciduous trees. This phenomenon was represented by the establishment of forests (type D) dominated by Ulmus davidiana var. japonica (UDJ) after it had been released from the suppression of evergreen forest trees during a period of nonforest land use that
prevents the successful recovery of evergreen trees. From these results we conclude that the impacts of land-use history on
the diversity of warm-temperate riparian forest landscape are multiphased: a period of nonforest land use has a strong negative
impact on lucidophyllous forest trees represented by the rare indigenous oak Q. hondae; release from the suppressive effects of the lucidophyllous species then encourages establishment of locally rare deciduous
tree flora represented by UDJ, which continue to persist for decades after abandonment of nonforest land use. |
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