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| 1 | Woody vegetation of protected areas in northern Togo. Cases of Barkoissi, Galangashi and Oti-Keran: ecological and structure analyses of plant communities显示文摘The 170 samples obtained from ligneous investigation in Barkoissi,Galangashi and Oti-Keran protected areas(northern Togo) were subjected to floristic processing and several multivariate analyses in order to study plant diversity,life form and chorological type distribution and to classify and identify the main plant communities with their demographic structure.First,the overall life form and phytogeographical type frequencies were calculated to analyze and show the distribution of the 68 plants species in this area.Then plant communities were determined by using the hierarchical clustering with wards method.The plant communities found were identified by the technique of indicator value(IndVal).For each grouping diversity index such as specific richness,Shannon index and Pielou's evenness was set out.The canonical correspondence analysis(CCA) was also used to relate the impact of environment factors and the distribution of samples.Finally the variance analysis(ANOVA) associated to post-hoc test was used to compare the similarity between the groupings.From these 170 samples,12 plant communities were discriminated,three for the reserve of Barkoissi,three for the reserve of Galangashi and six for the reserve of Oti-Keran.The samples were well distributed in the factorial plan form by axe 1 and 3 of CCA.The plant communities were distributed along the moisture gradient in the ordination.The Sudano-Zambesian species followed by Sudanian species were the phytogeographical types most found in these areas.The microphanerophytes were the most represented life form.The structural parameters such as diameter and height means,the basal area and the densities determined and submitted to post-hoc test show some important similarity between some groups found.In overall,the vegetation condition of the three protected areas is somehow disturbed while most of the plant communities are stable.These preliminary ecological data obtained are essential and fundamental for the management and protection for these ecosystems. | Folega FOUSSENI Wala KPERKOUM ZHANG Chun-yu ZHAO Xiu-hai Akpagana KOFFI | 2011 | Forestry Studies in China2011，13，1： | 3 |
| 2 | Satellite monitoring of land-use and land-cover changes in northern Togo protected areas显示文摘Remote-sensing data for protected areas in northern Togo, obtained in three different years(2007, 2000, and 1987), were used to assess and map changes in land cover and land use for this drought prone zone. The normalized difference vegetation index(NDVI) was applied to the images to map changes in vegetation. An unsupervised classification, followed by classes recoding, filtering, identifications, area computing and post-classification process were applied to the composite of the three years of NDVI images. Maximum likelihood classification was applied to the 2007 image(ETM+2007) using a supervised classification process. Seven vegetation classes were defined from training data sets. The seven classes included the following biomes: riparian forest, dry forest, flooded vegetation, wooded savanna, fallows, parkland, and water. For these classes, the overall accuracy and the overall kappa statistic for the classified map were 72.5% and 0.67, respectively. Data analyses indicated a great change in land resources; especially between 1987 and 2000 probably due to the impact of democratization process social, economic, and political disorder from 1990. Wide-scale loss of vegetation occurred during this period. However, areas of vegetation clearing and regrowth were more visible between 2000 and 2007. The main source of confusion in the contingency matrix was due to heterogeneity within certain classes. It could also be due to spectral homogeneity among the classes. This research provides a baseline for future ecological landscape research and for the next management program in the area. | Fousseni Folega Chun-yu Zhang Xiu-hai Zhao Kperkouma Wala Komlan Batawila Hua-guo Huang Marra Dourma Koffi Akpagana | 2014 | Journal of Forestry Research2014，25，2： | 2 |
| 3 | Long Term Evaluation of Green Vegetation Cover Dynamic in the Atacora Mountain Chain(Togo) and its Relation to Carbon Sequestration in West Africa显示文摘The research was done in the Atacora Mountain chain in Togo which tended to assess the change of vegetation cover during a 24-year period.It also aims to evaluate the dynamic of the net primary productivity(NPP) of the living plants over the same period.The Landsat imagery covering three different periods(1987, 2000, and 2011) was pre-processed to correct atmospheric and radiometric parameters as well as gapfilling the 2011 SCL-off images.Then, the vegetation indices such as NDVI(normalized difference vegetation index), SR(simple ratiovegetation index), SAVI(soil-adjusted vegetation index), and CASA(carnegie- ames- stanford approach)model for NPP were applied on these images after masking the study area.The results showed a quiet decrease in the vegetation cover.The vegetation loss was more significant from 2000 to 2011 than from1987 to 2000, and anthropogenic activities can be deemed as the main cause of the vegetation loss.The biomass assessment by NPP computation also showed a decrease over the time.Similar to the change of the vegetation cover, the ecosystem net productivity was very low in 2011 compared to 2000 and 1987.It seems that the general health condition of thevegetation, including its potentiality in carbon sinking,was negatively affected in this area, which has already been under threatened.A perpetual monitoring of these ecosystems by means of efficient techniques could enhance the sustainable management tools of in the framework of reducing emissions from deforestation and forest degradation(REDD). | Fousseni FOLEGA Yao Agbélessessi WOEGAN Dourma MARRA Kperkouma WALA Komlan BATAWILA Jean Leonardo SEBURANGA ZHANG Chun-yu PENG Dao-li ZHAO Xiu-hai Koffi AKPAGANA | 2015 | Journal of Mountain Science2015，12，4： | 2 |
| 4 | Efficiency and power upgrade by an additional high pres- sure economizer installation at an aged 620 MWe lignite- fired power plant显示文摘 | STEVANOVIC V D WALA T MUSZYNSKI S | 2014 | Energy2014，66，2： | 1 |
| 5 | Hormonal activity of transposed ovaries in young women treated for cervical cancer显示文摘 | Olejek A Wala D Chimiczewski P | 2001 | Gynecol Endocrinol2001，15，1： | 1 |
| 6 | New Approaches to Mine-Face Ventilation 显示文摘 | Wala A Jacob J Brown J Huang G | 2003 | Mining Engineering2003，55，3： | 1 |
| 7 | Desilication of ZSM-5 and ZSM-12 zeolites:Impact on textural,acidic and catalytic properties显示文摘 | GIL B MOKRZYCKI L SULIKOWSKI B OLEJNICZAK Z WALAS S | 2010 | Catal Today2010，152，14： | 1 |
| 8 | Assessment and impact of anthropogenic disturbances in protected areas of northern Togo显示文摘These days,human activities in the savanna and the remaining dry and riparian forests of the Sudanian ecoregions continue to have their impact.These anthropogenic practices are still the main cause of disturbances in these areas.In order to investigate and assess the importance of these disturbances,caused by people bordering on protected areas and to determine the relation between these activities and the environment in which they are carried out,220 samples were selected in the three main protected areas of northern Togo.The investigation was mainly qualitative,considering the floristic sampling of this drought area;any anthropogenic activities observed were recorded.A simple investigative questionnaire about the activities of rural people in the reserved areas was distributed to individuals encountered in the study area.Each sample in the investigation ended with a site description of its ecological characterization,i.e.,soil features,topography,fauna footprints,dominant plant species and GPS position;we also took photographs of the site.Data processing was entirely based on descriptive statistics and a factor analysis.The results show that eight kinds of human activities,i.e.,the use of pastures,tree cutting,bush fires,charcoal production,harvesting of plant material,farming,honey harvesting and hunting,were noted to be serious disturbances to the integrity of the ecosystems.Among these disturbances,three are recurrent in all the sampled areas of which the use of pastures accounts for 31.88%,tree cutting for 30.35% and bush fires for 30.13%.Fire and pasture disturbances are closely linked and are responsible for the current features of the savanna area of the region.Tree cutting is more a direct function of the need for the production of wood fuel,generally used by city populations.Hunting,farming and honey production are of lesser importance in the area and therefore,do not pose a significantly negative effect on the growth of fauna and flora.Knowledge of these disturbances in the context of requalification and a renewed demarcation of protected areas in Togo is essential for their sustainable management. | Folega FOUSSENI Dourma MARRA Kperkouma WALA Komlan BATAWILA ZHANG Chun-yu ZHAO Xiu-hai Koffi AKPAGANA | 2012 | Forestry Studies in China2012，14，3： | 1 |
| 9 | Hormonal activity of transposed ovaries in young women treated for cervical cancer显示文摘 | Olejek A Wala D Chimiczewski P | 2001 | Gynecol Endocrinol2001，15，1： | 1 |
| 10 | Application of a metal ion-imprinted polymer based on salen-Cu complex to flow injection preconcentration and FAAS determination of copper显示文摘 | Walas S Tobiasz A Gawin M | 2008 | Talanta2008，76，1： | 1 |
| 11 | Characterization of morphine-induced hyperalgesia in male and female rats显示文摘 | Holtman JR Jr Wala EP | 2005 | Pain2005，114，12： | 1 |
| 12 | Cu( Ⅱ )-imprinted styrene-divinylbenzene beads as a new sorbent for flow injection-flame atomic absorption determination of copper显示文摘 | Tobiasz A Walas S Trzewik B | 2009 | Microchemica[Journal2009，93，1： | 1 |
| 13 | Hormonal activity of transposed ovaries in young women treated for cervical cancer 显示文摘 | Olejek A Wala D Chimiczewski P | 2001 | Gynecol Endocrinol2001，15，1： | 1 |
| 14 | Babesia canis canis,Babesia canis vogeli,Babesia canis rossi:differentiation of the three subspecies by a restriction fragment length poly- morphism analysis on amplified small subunit ribosomal RNA genes显示文摘 | Carret C Walas F Carcy B | 1994 | Eukaryot Microbiology1994，46，3： | 1 |
| 15 | Babesia canis canis, Babesia canis vogeli, Babesia canis rossi: differentiation of the three sub- species by a restriction fragment length polymorphism analysis on amplified small subunit ribosomal RNA genes显示文摘 | Carret C Walas F Carey B et ol | 1999 | J Eukaryot Mi- crobiol1999，46，3： | 1 |
| 16 | Dehydroascorbic acid levels in fresh fruit and vegetables in relation to total vitamin C activity 显示文摘 | Wills R B H Walas Greenfield H | 1984 | Journal of Agricultural and Food Chemistry1984，32，： | 1 |
| 17 | Multicriteria VMAT optimization显示文摘 | Craft D McQuaid D Wala J | | 0，，： | 1 |
| 18 | Detection of neutralizing anti-therapeutic protein antibodies in serum or plasma samples containing high levels of the therapeutic protein显示文摘 | LOFGREN JA WALA I KOREN E | 2006 | J Immunol Methods2006，308，12： | 1 |
| 19 | Effect of selenium on macro- and microelement distribution and physiological parameters of rape and wheat seedlings exposed to cadmium stress显示文摘 | Maria Zembala Maria Filek Stanis?aw Walas Halina Mrowiec Andrzej Korna? Zbigniew Miszalski Helin? Hartikainen | 2010 | Plant and Soil (-)2010，，1： | 1 |
| 20 | Acute Traumatic Spon- dylolisthesis at the Lumbosacral Junction显示文摘 | Wala 1E Mohamed AE Darnel CF | 2007 | Trauma2007，，62： | 1 |
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