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Article type: Cover
2005 Volume 14 Issue 2 Pages
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Published: October 31, 2005
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Article type: Cover
2005 Volume 14 Issue 2 Pages
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Published: October 31, 2005
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Yoshiyuki Inagaki, Hidehisa Fukata, Shigeo Kuramoto, Satoru Miura
Article type: Article
2005 Volume 14 Issue 2 Pages
69-75
Published: October 31, 2005
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We investigated relationships between the phenology of leaf-fall and nitrogen use by trees in eight Hinoki cypress (Chamaecyparis obtusa Endlicher) plantations in three areas (Otoyo, Kochi, Tsuno) in Kochi prefecture. The time of 10% annual leaf-fall ranged from 7 September to 22 October, and time of 50% annual leaf-fall ranged from 25 October to 3 January of the following year. The time between 10% and 90% annual leaf-fall ranged from 30 to 189 days. Although the mean annual temperature of the forests ranged from 9.6 to 16.7℃ and differed greatly, mean annual temperature was not correlated with the phenology of leaf-fall. By contrast, the time of 10% annual leaf-fall was negatively correlated with the nitrogen concentration of litter-fall. These results suggest that in nitrogen poor environments, plants have longer growth period. The time of 50% annual leaf fall was positively correlated with the relative height growth of the forest. The leaf-fall in the forest with lower height growth is earlier probably due to water stresses. These results suggest that the time of leaf-fall of the Hinoki cypress forests in the region occurs earlier in water-limited conditions and later in nitrogen limited conditions.
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Shigeo Kuramoto, Eiji Kodani, Keigo Matsue
Article type: Article
2005 Volume 14 Issue 2 Pages
77-82
Published: October 31, 2005
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The number, size and geographical distribution of beech forest patch were studied in Shikoku region, based on natural environment GIS system. Totally, 252 of beech forest patch were detected, and their total area size was about 25000 ha, that is 1.8% of total forested area in Shikoku region. Negative relationship between patch size and number of patch was also detected from analysis. Small-sized patches less than 10 ha were 63% of total patch numbers, although these occupied 2% of the total patch area. Large-sized patches over 1000 ha were only four of total, while total area of these was 58% of total patch area. Beech forest patches were mainly distributed in central mountains, where the largest patch or a set of large-sized patches was found. In other mountains apart from the central mountains, small-sized patches were distributed. Difference in the distribution pattern of patch among the mountains was related to the abundance and size of potential distribution range, defined by altitude of mountains. Fragmentation of beech forest caused by the expansion of conifer plantation was also implied as the factor of above-described pattern.
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Mayuko Jomura, Fumiyo Takeda, Yuji Kominami, Yoichi Kanazawa, Yoshiaki ...
Article type: Article
2005 Volume 14 Issue 2 Pages
83-88
Published: October 31, 2005
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Decay rates of block specimens of Japanese red pine (Pinus densiflora Sieb. et Zucc.) were determined by examining the weight loss rates for two vertical positions (above and on the surface of the forest floor) and three locations along a slope (ridge and valley). Decay-rate constants based on the single-exponential decay model ranged considerably, from 0.004 to 0.316 yr^<-1>. Decay-rate constants of on the surface was significantly larger than that of above the surface however decay-rate constants was not significantly different among locations. Decay-rate constants had linear relation to water content of block specimens. Limited contact with the ground caused the lower water content of the specimens. The depth of the litter layer contributed to the variation in the water content of the specimens placed on the ground due to the subtle concavo-convex nature of the ground surface around the specimens. The change of the characteristics of the specimens by decomposition progress would cause the variation in water content of specimens. Therefore, to quantify the spatial variation in the decay rate of coarse woody debris (CWD) in forest ecosystems, the spatial variation in water content caused by differences in the environmental conditions around the CWD, such as contact with soil and depth of the litter layer, and CWD characteristics changed through decomposition progress should be considered.
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Keiji Odani
Article type: Article
2005 Volume 14 Issue 2 Pages
89-94
Published: October 31, 2005
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Atsushi Sakai, Shigeho Sato
Article type: Article
2005 Volume 14 Issue 2 Pages
95-99
Published: October 31, 2005
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Flowering and fruiting phenology and masting were investigated for 7 pioneer tree species in a national forest in central Kochi, Japan. According to the observations throughout the seasons, Idesia polycarpa was the earliest in flowering (Apr.), while Rhus javanica var. roxburghii was the latest (Aug.). Fruits of Swida macrophylla ripened in the earlier (Sep.), followed by Mallotus japonicus, Clerodendrum trichotomum, Zanthoxylum ailanthoides,I. polycarpa, Rhus trichocarpa and R. javanica var. roxburghii afterward. The last one held fruits until March of the next year. According to five years observations, M japonicus, Z. ailanthoides, C. trichotomum and R. javanica var. roxburghii bore fruits annually. I. Polycarpa and S. macrophylla bore fruits biennially, synchronizing the bearing years. R. trichocarpa bore fruits only once during five years. For I. polycarpa, relative growth rates (RGR) of basal area seemed small in the fruiting trees than those of the unfruitful trees, although a significant difference was not obtained. It is assumed that pioneer trees provided much food for frugivorous birds and much amount of buried viable seeds to surrounding conifer plantations, by producing a lot of fruits with high frequency.
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Makoto Goto
Article type: Article
2005 Volume 14 Issue 2 Pages
101-105
Published: October 31, 2005
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Makoto Goto
Article type: Article
2005 Volume 14 Issue 2 Pages
107-110
Published: October 31, 2005
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Shinya Osaki
Article type: Article
2005 Volume 14 Issue 2 Pages
111-116
Published: October 31, 2005
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
120-121
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
122-123
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Article type: Appendix
2005 Volume 14 Issue 2 Pages
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Published: October 31, 2005
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Article type: Cover
2005 Volume 14 Issue 2 Pages
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Published: October 31, 2005
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Article type: Cover
2005 Volume 14 Issue 2 Pages
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Published: October 31, 2005
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