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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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A model of seasonal foliage dynamics of the subtropical mangrove species Rhizophora stylosa *** at the northern limit of its distribution

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Forestry Studies in China 2014年第3期16卷 147-157页

作者： Sahadev Sharma A T M RafiquI Hoque Kangkuso Analuddin akio hagihara Graduate School of Engineering and Science University of the Ryukyus Department of Mechanical and Environmental Informatics Tokyo Institute of Technology Institute of Forestry and Environmental Sciences Chittagong University Department of Biology Haluoleo University Laboratory of Ecology and Systematics Faculty of ScienceUniversity of the Ryukyus

Background： Progress of forest production in response to the environment requires a quantitative understanding of leaf area development. Therefore, it is necessary to investigate the dynamics of seasonal crown foliage in order to understand the productivity of mangroves, which play an important role in the subtropical and tropical coastlines of the world. Method： Crown foliage dynamics of the mangrove Rhizophora styloso were studies to reveal patterns of leaf recruitment, survival and seasonal leaf area growth. Results： Flushing of leaves occurred throughout the year, but both flushing and leaf area growth pattern of leaves varied with season. Maximum flushing occurred in summer, but leaf areas did not differ significantly with season. The half-expansion period is longer, and the intrinsic rate of increase was lower in winter. Summer flushed leaves grew faster at their initial stage and reached their maximum area over a shorter period of time. The difference in temperature and air vapor pressure deficit （VPD） between summer and winter contributed to the present dynamics of foliage patterns. The mean leaf longevity was estimated to be 13.1 month. The crown foliage area was almost stable throughout the year. Conclusions： Homeostatic control of the crown foliage area may be accompanied by the existence of ecophysiological mechanisms in R. stylosa. Integrating crown foliage dynamics into forest models represents an important step towards incorporating physiological mechanisms into the models for predicting growth responses to environmental changes and for understanding the complex responses of tree growth and litter production.

关键词： Crown foliage area Rhizophora stylosa Leaf area growth Leaf survivorship Litterfall Temperature

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杉木竞争密度效果分析

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应用生态学报 2001年第2期12卷 272-274页

作者：薛立萩原秋男华南农业大学林学院广州510642 琉球大学理学部日本冲绳9030213

用竞争密度 (C D)效果的倒数式分析了杉木的生长过程 .随着时间的推移 ,C D曲线在双对数图上向上移动 .随着物理时间t的增加 ,生物时间τ(τ被定义为逻辑斯蒂生长曲线中生长系数λ(t)的积分 )倾向于增加到最大值 .C D效果倒数式中的系数... 详细信息

用竞争密度 (C D)效果的倒数式分析了杉木的生长过程 .随着时间的推移 ,C D曲线在双对数图上向上移动 .随着物理时间t的增加 ,生物时间τ(τ被定义为逻辑斯蒂生长曲线中生长系数λ(t)的积分 )倾向于增加到最大值 .C D效果倒数式中的系数A和B被求出 .随着生物时间τ的增加 ,系数A急剧增加到最大值后下降 ,倾向于稳定在一个常数 ,而系数B呈指数下降 ,倾向于接近零 .随着林分的生长 ,生长系数λ(t)倾向于下降 .

关键词： C-D效果倒数式杉木竞争密度生长发育

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I-72杨林的竞争密度效应(英文)

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林业科学 2003年第5期39卷 61-66页

作者：薛立萂原秋男华南农业大学林学院广州510642 琉球大学理学部

用竞争密度 (C D)效应的倒数式 (即 1 w =Aρi+B ,式中w和ρi 分别为平均单株材积和密度 ,A和B为系数 )分析了I- 72杨林的生长过程。在双对数图上 ,I - 72杨林各生长阶段的平均单株材积和密度的观察值很好地吻合了竞争密度效应曲线 ,... 详细信息

用竞争密度 (C D)效应的倒数式 (即 1 w =Aρi+B ,式中w和ρi 分别为平均单株材积和密度 ,A和B为系数 )分析了I- 72杨林的生长过程。在双对数图上 ,I - 72杨林各生长阶段的平均单株材积和密度的观察值很好地吻合了竞争密度效应曲线 ,竞争密度效应曲线随时间的推移向上移动。通过分析得出了生物时间τ(逻辑斯蒂生长曲线中生长系数λ(t)的积分 ) ,系数A和B ,生长系数λ(t)和最终收获量Y(t)的变化趋势及系数A和B的生物学意义。生物时间τ随着物理时间t的增加而增加。随着τ的增加 ,系数A急剧增加到最大值后逐渐下降 ,而系数B呈指数下降 ,倾向于接近零。随着林分的生长 ,生长系数λ(t)倾向于下降 ,而最终收获量Y(t)逐渐增加。以C D效应为基础 ,提出了对高密度的 7a生I- 72杨林进行间伐的建议。

关键词： I-72杨林倒数式单株材积密度生长过程双对数图竞争密度效应曲线生物时间

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Hepatocellular carcinoma recurrence in HCV patients treated with direct-acting antivirals after curative treatment

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Hepatoma Research 2019年第5期5卷 26-36页

作者： Shinichiro Nakamura Kazuhiro Nouso Hiroyuki Okada Hideki Onishi Shin-ichi Fujioka YasuyukiAraki Shouta Iwadou Takashi Kumada Hidenori Toyoda Kenta Motomura Kazuya Kariyama Haruhiko Kobashi Toshihiko Kaneyoshi Masaharu Ando akio Moriya Hideaki Taniguchi YouichiMorimoto Hiroaki hagihara Masatoshi Tanaka Okayama University Graduate School of Medicine Dentistry and Pharmaceutical SciencesOkayama 700-8558Japan Okayama Saiseikai General Hospital Okayama 700-8558Japan Hiroshima City Hiroshima Citizens Hospital Hiroshima 731-0293Japan Ogaki Municipal Hospital Gifu 503-8502Japan Iizuka Hospital Fukuoka 820-8505Japan Okayama City Hospital Okayama 700-8557Japan Okayama Red Cross General Hospital Okayama 700-8607Japan Fukuyama Medical Center Hiroshima 720-8520Japan Mitoyo General Hospital Kagawa 769-1695Japan Tottori Municipal Hospital Tottori 680-8501Japan Kurashiki Central Hospital Okayama 710-8602Japan Sumitomo Besshi Hospital Ehime 792-8543Japan Yokokura Hospital Fukuoka 839-0215Japan Japanese Red Cross Society Himeji Hospital Hyogo 670-8540Japan

Aim:The increased risk of hepatocellular carcinoma(HCC)recurrence in hepatitis C virus(HCV)-infected patients treated with direct-acting antivirals(DAAs)after curative treatment for HCC is *** purpose of this study was to examine the risk of HCC recurrence after DAA ***:We conducted a retrospective cohort study of 312 consecutive patients with HCV-related HCC who received DAA therapy in participating institutions between September 2014 and July *** patients received curative ;hepatectomy or radio-frequency *** calculated the annual incidence of HCC recurrence after DAA therapy and identified the risk factors for HCC recurrence using Cox regression ***:The median age was 74 years old,and a sustained virological response was achieved by 288 *** 3-year-overall survival rate was 95.4%in a median follow-up period of 855 *** recurred in 135 *** 1-,2-and 3-year recurrence rates were 18.3%,38.8%and 55.4%,respectively.A multivariate analysis revealed that the following factors were associated with HCC recurrence:multiple tumors at the first HCC treatment[hazard ratio(HR)=2.21;95%CI:1.41-3.49],a history of multiple treatments for HCC(HR=1.97;95%CI:1.28-3.02),andα-fetoprotein(AFP-L3)≥10%at the initiation of DAA therapy(HR=4.74;95%CI:2.10-10.7).Conclusion:Among patients treated with DAAs after the curative treatment of HCC,multiple tumors at the first HCC treatment,multiple prior HCC treatments and a high AFP-L3 level before DAA therapy were associated with recurrence,and the rate of recurrence was comparable to that before the DAA era.

关键词： Hepatocellular carcinoma hepatitis C virus direct-acting antiviral recurrence

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