Litter-fall and reproductive seasonalities in aLeucaena leucocephala forest at Chichijima, Ogasawara (Bonin) Islands
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Seasonal changes in litter components were measured in a closedLeucaena leucocephala forest stand in Chichijima, Ogasawara (Bonin) Islands, situated in a wet subtropical climate. The phytomass of the stand was estimated as 5.62, 1.47 and 0.448 kg d.w. m−2 for stems, branches and leaves, respectively.
Litter from the canopy was collected semimonthly by ten 0.5 m2 traps. Leaf-litter production rate was low in spring, medium in summer and autumn, and peaked in mid-winter. Annual production of leaf-litter was 498 g d.w. m−2. Annual turnover rate of canopy leaves was 1.1. Flower-litter showed biannual production with peaks in spring and autumn, and the former peak largely exceeded the latter one in quantity. Seed maturation needed about 3 months. Annual production of reproductive organs was 89.2, 89.4, 19.1 and 99.4 g d.w. m−2 for flowers, mature seeds, immature ones and pods, respectively. Number, of mature seeds disseminated exceeded 2,500 m−2. Annual production of branch- and bark-litter was 345 g d.w.m−2.
Annual amount of plant litter from the canopy was as large as 1,150 g d.w. m−2, showing higher productivity and higher rate of matter turnover in this forest than in temperate forests.
Key wordsLeucaena leucocephala Litter fall Reproductive seasonality Seed production Subtropical forest
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- Gray, S.G. 1968. A review of research onLeucaena leucocephala. Tropical Grasslands2: 19–30.Google Scholar
- Hill, G.D. 1971.Leucaena leucocephala for pasture in the tropics. Herbage Abstract41: 111–119.Google Scholar
- IDRC (International Development Research Center). 1983.Leucaena Research in the Asian-Pacific Region. IDRC, Ottawa.Google Scholar
- Kino, H. 1977. Estimation of biomass and food consumption of invertebrate defoliators inhabiting the canopy of the secondary deciduous forest of Kaido.In: Y. Kitazawa ed., Biomass of Animals of Terrestrial Ecosystems in Japan. Annual Report of 1977 p. 57–63. Rikkyo Univ., Tokyo (in Japanese with English summary).Google Scholar
- Kobayashi, S. 1978. A list of the vascular plants occuring in the Ogasawara (Bonin) Islands. Ogasawara Research1: 1–33.Google Scholar
- Maejima, I. andS. Oka. 1980. Climatic records of the Ogasawara (Bonin) Islands. Ogasawara Research3: 1–42.Google Scholar
- Matsumoto, T. 1978. Estimation of litter fall in the deciduous forest of Machigazawa, Mt. Tanigawa.In: Y. Kitazawa, ed. Biomass of Animals of Terrestrial Ecosystems in Japan, Annual Report of 1978 p. 61–66. Rikkyo Univ., Tokyo (in Japanese with English summary).Google Scholar
- Nakai, T. 1930. Abstract of the flora of Ogasawara Islands. Bull. Bio-Geo. Soc. Jap.1: 181–210 (in Japanese).Google Scholar
- Nishioka, M. andH. Kirita. 1978. Litterfall.In: T. Kiraet al., ed., Biological Production in a Warm-temperate Evergreen Oak Forest of Japan, JIBP Synthesis18: 231–238. Univ. of Tokyo Press, Tokyo.Google Scholar
- Okabe, M. 1935. Research on the Flowering and fruiting Phenology of Woody Plants of Ogasawara Islands. Ogasawara Div., Tokyo Prefectural Gov. Tokyo (in Japanese).Google Scholar
- —. 1938. Research on the Flora of Ogasawara Islands. Ogasawara Div., Tokyo Prefectural Gov., Tokyo (in Japanese).Google Scholar
- Shimizu, Y. 1983. Phenological studies of the subtropical broad-leaved evergreen forests at Chichijima Island in the Bonin (Ogasawara) Islands. Jap. J. Ecol.33: 135–147.Google Scholar
- Tadaki, Y. andT. Kagawa. 1968. Studies on the production structure of forest (XIII) Seasonal change of litter-fall in some evergreen stands. J. Jap. Forest. Soc.50: 7–13 (in Japanese with English summary).Google Scholar
- Toyota, T. 1981. Flora of Bonin Islands. Aboc-sha, Kamakura (in Japanese).Google Scholar