Effects of topography and planted trees on the distribution of naturally regenerated broad-leaved trees in a 140-year-old <Emphasis Type="Italic">Cryptomeria japonica</Emphasis> plantation in northern Kyushu,Japan |
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Authors: | Takafumi Inoue Tsutomu Enoki Naoaki Tashiro Kotaro Sakuta Susumu Inoue |
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Institution: | (1) Kasuya Research Forest, Kyushu University, 394 Tsubakuro, Sasaguri, Fukuoka 811-2415, Japan;(2) Ashoro Research Forest, Kyushu University, Hokkaido, Japan;(3) Faculty of Agriculture, Kyushu University, Fukuoka, Japan |
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Abstract: | We investigated factors affecting the distribution of naturally regenerated broad-leaved trees in a 140-year-old Cryptomeria japonica plantation. We used path analysis to examine the relationship among microtopography, the biomass of planted trees, and the
biomasses of canopy and subcanopy trees of broad-leaved species. The study plot was divided into three topographic types (ridge,
slope, and valley), and we discuss how the different topographic types are affected. For all topographic types, the biomass
of canopy trees of broad-leaved species decreased with convexity. For slope and valley topographies, the biomass of subcanopy
trees of broad-leaved species also decreased with convexity. For ridge topography, the biomass of subcanopy trees of broad-leaved
species increased with the biomass of planted trees, and decreased with the biomass of canopy trees of broad-leaved species.
These results suggest the effects of microtopography on the biomass of subcanopy trees were much larger than the effects of
canopy trees for slope and valley topographies, while the effects of microtopography were smaller for ridge topography. |
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Keywords: | Broad-leaved trees Old-growth plantation Path analysis Planted trees Topography |
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