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| 1 | Biomass and net primary productivity of mangrove communities along the Oligohaline zone of Sundarbans, Bangladesh显示文摘Background:The article presents the first estimates of biomass and productivity for mangrove forests along the Oligohaline zone of the Sundarbans Reserve Forest(SRF),Bangladesh.This study was conducted overone year from March 2016 to April 2017.Stand structure,above and below-ground biomass changes,and litterfall production were measured within a 2100 m^2 sample plot.Methods:All trees in the study plots were numbered and height(H) and diameter at breast height(DBH) were measured.Tree height(H) and DBH for each tree were measured in March 2016 and 2017.We apply the above and belowground biomass equation for estimating the biomass of the mangrove tree species(Chave et al.Oecologia145:87-99,2005; Komiyama et al.J Trop Ecol 21:471-477,2005).Litterfall was collected using 1-mm mesh litter traps with collection area of 0.42 m^2.Net Primary Production(NPP) was estimated by the summation method of Ogawa Primary productivity of Japanese forests:productivity of terrestrial communities,JIBP synthesis(1977) and Matsuura and Kajimoto Carbon dynamics of terrestrial ecosystem:Systems approach to global environment(2013).Results:Heritiera fomes has maintained its dominance of the stand and also suffered the highest tree mortality(2.4%) in the suppressed crown class.The total above-ground biomass(AGB) and below-ground biomass(BGB) of the studied stand was 154.8 and 84.2 Mg ha^(-1),respectively.Among the total biomass of the trees,64.8% was allocated to AGB and 35.2% to BGB.In case of species-wise contribution of biomass allocation,Avicennia officinalis showed the highest score and Aglaia cucullata the lowest.Mean annual total litterfall was 10.1 Mg ha^(-1)·yr^(-1),with the maximum litterfall in winter or dry season and late summer or rainy season.The mean AGB increment and above-ground net primary productivity(AGNPP) were 7.1 and 172 Mg·ha^(-1)·yr^(-1),respectively.Total net primary productivity(NPP) was estimated to be 21.0 Mg·ha^(-1)·yr^(-1) over the observed period.The results in the Sundarbans mangrove forests exhibited that mangrove communities with similar height and diameter produced different biomass production with the different basal area.The present analysis revealed that the root biomass was large enough and the mean ratio of above-/below-ground biomass was estimated to be 1.84.Conclusions:Mangrove communities growing at the oligohaline zone of the Sundarbans,Bangladesh showed high biomass and net primary production indicating their ecological and conservation significance that may be considered in future decision making process for the area as well as in understanding the role of Sundarbans mangrove forest on mitigating the effect of global warming. | Md. Kamruzzaman Shamim Ahmed Akira Osawa | 2017 | Forest Ecosystems2017，4，4： | 2 |
| 2 | Report of the Committee of the Japan Diabetes Society on the Research of Fulminant and Acute‐onset Type 1 Diabetes Mellitus: New diagnostic criteria of fulminant type 1 diabetes mellitus (2012)显示文摘 | Akihisa Imagawa Toshiaki Hanafusa Takuya Awata Hiroshi Ikegami Yasuko Uchigata Haruhiko Osawa Eiji Kawasaki Yumiko Kawabata Tetsuro Kobayashi Akira Shimada Ikki Shimizu Kazuma Takahashi Masao Nagata Hideichi Makino Taro Maruyama | 2012 | J Diabetes Invest2012，，6： | 1 |
| 3 | A deficiency of gastric interstitial cells of Cajal accompanied by decreased expression of neuronal nitric oxide synthase and substance P in patients with type 2 diabetes mellitus显示文摘 | Hirohiko Iwasaki Masayoshi Kajimura Satoshi Osawa Shigeru Kanaoka Takahisa Furuta Mutsuhiro Ikuma Akira Hishida | 2006 | Journal of Gastroenterology2006，，11： | 1 |
| 4 | Land use patterns and tree species diversity in the Volta Geological Unit, Togo显示文摘The application of remote sensing in understanding tree species structural diversity and land use patterns relationship is imperative for reforestation and biodiversity conservation efforts. This study assesses land use patterns and tree species structural diversity in previously reforested hilly sandstone regions of northern Togo. The physical height, and diameter at breast height(DBH) more than 5 cm of all tree species in each given plot were measured in summer 2017. A total of 75 plots of 900 m^2 installed along the toposequence were recorded. In addition, a semi-supervised classification of Landsat 8 images in January of 2018, was also used to classify the land use patterns. 36 tree species and 19 families were recorded for the entire study area. Meanwhile, 19 tree species and 15 families were recorded for the previously afforested zones. The most abundant species included the Sterculiaceae, Zygophyllaceae, Meliaceae, and Mimosaceae. The trees stand structure represented 8.61 ± 0.57 m, 11.28 ± 1.76 cm, and 0.018 ± 0.009 m^2 per hectare for height, diameter and basal area respectively. Major land use patterns were tree and shrub savannahs, parklands and croplands which represented over 60% of the landscape. It is necessary to examine the regeneration and vegetative multiplication potentials of the most frequent and abundant tree species for any eventual future afforestation programs in these hilly sandstone regions of northern Togo. | FOLEGA Fousseni ATAKPAMA Wouyo WALA Kperkouma MUKETE Beckline SHOZO Shibata AKIRA Osawa ZHAO Xiu-hai AKPAGANA Koffi | 2019 | Journal of Mountain Science2019，16，8： | 0 |
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