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Stand structure, phenology and litterfall dynamics of a subtropical mangrove Bruguiera gymnorrhiza

Journal of Forestry Research 2016年第3期27卷 513-523页

作者： Md.Kamruzzaman Mouctar Kamara Sahadev Sharma Akio Hagihara Forestry and Wood Technology Discipline Khulna University Laboratory of Forest Utilization Graduate School of Global Environmental Studies Kyoto University Department of Mechanical & Environmental Informatics Tokyo Institute of Technology Laboratory of Ecology and Systematics Faculty of ScienceUniversity of the Ryukyus

We evaluated the phenology and litterfall dynamics of the mangrove Bruguiera gymnorrhiza（L.）Lamk along the Okukubi River, Okinawa Island, *** 3 years, this species showed the highest litterfall of leaves and stipules in summer and the lowest litterfall in winter. From Kendall＇s coefficient of concordance, the monthly changes in leaf, stipule, and branch were strongly and significantly concordant among years. Leaf and stipule litterfall could be governed by monthly maximum wind speed, monthly day length, and monthly mean air temperature. Branch litterfall depended on monthly maximum wind speed and monthly rainfall, and increased exponentially with increasing monthly maximum wind speed. Mean total litterfall was 11.8 Mg ha^（-1）yr^（-1）, with the largest component being leaf litterfall（65.8 %）. Annual leaf litterfall per plot was almost constant regardless of the tree density of the plot. Mean leaf longevity was 18 *** and mature propagule litterfall might be influenced by monthly mean air temperature, monthly day length and monthly mean air temperature. The average development periods from flower buds to flowers and flower buds to mature propagules were 1 and 8 months, *** for leaf and branch, all vegetative and reproductive organ litterfall had clear annual cycles. B. gymnorrhiza showed a positive correlation between leaf production and reproductive organ production.

关键词： Constant leaf mass Conversion rate Development phase Environmental factors monthlypattern

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