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Simulation of the Dynamics of Land Cover and Land Use in the Lobo River Watershed Upstream of Nibéhibé(Center-West of Côte d’Ivoire)

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Journal of Geographic Information System 2020年第5期12卷 519-530页

作者： Kouakou Hervé Kouassi Arthur Brice Konan-Waidhet Affoué Berth Yao berenger koffi Ettibou Damase Kadjo Laboratory of Science and Technology of Environment Jean Lorougnon Guédé University Daloa C&#244 te d’Ivoire

From medium-resolution satellite images (Landsat TM, ETM+ and OLI), the spatial dynamics of land cover and land use are highlighted. The objective of this study is to quantify the evolution of land use in the watershed of the Lobo River upstream of Nibéhibé between 1986 and 2019 in order to analyze the impacts of human activities on the landscape. The study method was based, on the one hand, on the processing of satellite images, for the analysis of the dynamics of land use and, on the other hand, on the CA-Markov model, for the prediction of land use by 2050. It emerged from this study that the land use maps produced made it possible to highlight the spatio-temporal dynamics of land use on the basin. For the period from 1986 to 2019, there is a decrease in the area of forests in favor of built-bare ground and crops and fallows. A land use scenario for the years 2019 and 2050 was simulated with an accuracy of 87.11%. The regressive trend in forests seems to continue in the future with current land use practices.

关键词： Satellite Image Land Cover and Land Use Space-Time Modeling Lobo

Simulation of the Dynamics of Land Cover and Land Use in the Lobo River Watershed Upstream of Nibéhibé (Center-West of Côte d’Ivoire)

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Critical review of the impact of cover crops on soil properties

Journal of Geographic Information System 2020年第5期

作者： Kouakou Hervé Kouassi Arthur Brice Konan-Waidhet Affoué Berth Yao berenger koffi Ettibou Damase Kadjo

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International Soil and Water Conservation Research 2022年第3期10卷 343-354页

作者： Komlan Koudahe Samuel CAllen koffi Djaman Biological and Agricultural Engineering Department Kansas State University1016 Seaton Hall920 N.Martin Luther King Jr.DriveManhattanKS66506USA Department of Plant and Environmental Sciences New Mexico State UniversityAgricultural Science Center at FarmingtonP.O.Box 1018FarmingtonNM87499USA

Grasses as well as leguminous and non-leguminous broadleaves are the major categories of commonly grown cover crops *** review focuses on the contribution of cover crops to soil *** review first considers the single and mixed cover crops and shows that grass species are desirable for their decay and ability to provide substantial soil cover,broadleaf species are used for their quick decomposition and capacity of releasing residues into the soil,while the leguminous species are used for their ability to fix atmospheric ***,the impacts of cover crops on soil health are *** cover crops into conventional cropping systems may reduce soil bulk density,improve soil structure and hydraulic properties to facilitate increased water infiltration and *** residue additions from cover crops may enhance soil organic C and N accretion as well as increase availability of P,K,Ca,Fe and Mg in some soil types under certain climatic ***,cover crops may provide a better condition for microbial activity,abundance,and ***,the review shows that through proper management,cover crops may be utilized as an essential component of soil conservation practices for enhanced soil ***,further investigation is necessary to determine cover crop effects in additional cropping systems and climatic zones as well as the long-term effects of cover crops on soil properties,subsequent crop yield,and overall cropping system *** review is an important source of information for crop growers,crop management institutions,universities,and crop consultants for sustainable agricultural production.

关键词： Cover crops Soil properties Grasses Leguminous

Microbiological and chemical hazards of commercial attieke (a fermented cassava product) produced in the south of Côte d’Ivoire

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Food Quality and Safety 2019年第3期3卷 187-190页

作者： Kouamé Kohi Alfred Bouatenin koffi Maizan Jean Pau Djeni N’Dede Théodore Dje koffi Marcellin Department of Food Sciences and Technology Laboratory of Biotechnology and food MicrobiologyUniversity of Nangui AbrogouaAbidjanCôte d’Ivoire Food Security Research Group Centre Suisse de Recherche ScientifiqueAbidjanCote d’Ivoire

Objectives:Information on the distribution and presence of microbiology and chemical hazard of commercial attieke(a fermented cassava product)produced in the south of Côte d’Ivoire were *** and Methods:Microbiological analyses and chemical were carried out,which included the total viable bacteria,Staphylococcus aureus,Salmonella and Bacillus spores,heavy metal(pb,Cd,Mn,Fe,Cu,and Cr).Results and Conclusions:The results revealed that the viable bacteria counts ranged from in all of *** aureus counts in the samples were comprised between(1.8±0.4)10^(2)(Jacqueville localitie)and(4.3±1.8)10^(3)(Abidjan localitie).While that of Bacillus cereus was ranged from(1.1±0.9)10^(2)(Adzopélocalitie)and(5.1±3.2)10^(2)(Abidjan localitie).Salmonella *** not *** levels of Pb in all samples were between 2.2±0.1 mg/kg(Grand-lahou localitie)and 4.5 mg/kg±0.15(Abidjan localitie)while the Cd levels of the samples varied between 0.02±0.1 mg/kg(Adzopélocalitie)and 0.07±0.1 mg/kg(Divo localitie).The levels of Cr in the samples were comprised between 0.1±0.03 mg/kg(Adzopélocalitie)and 0.95±0.1 mg/kg(Abidjan localitie)while Fe(7.3±1.5 mg/kg)and Cu(1.7±0.2 mg/kg)levels were the highest,respectively in Sikensi and Grand-Lahou *** from Divo localitie contained high amounts of Mn(1.6±0.1 mg/kg).The occurrence of some microbiological and chemical hazard that commercial attieke collected in Cote d’Ivoire may act as a reservoir of pathogenic micro-organisms and heavy metal for human.

关键词： attieke heavy metal microbiogical and chemical hazard

Alternate phenotype–genotype selection for developing superior high-yielding irrigated rice lines

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The Crop Journal 2018年第2期6卷 191-201页

作者： Yonnelle Dea Moukoumbi Raafat El-Namaky koffi Djaman Daouda Mbodj Baboucarr Manneh Irrigated Rice Breeding Unit Africa Rice Center(Africa Rice)Sahel Regional StationBP 96 Saint LouisSenegal National Institute of Agricultural Research Gros bouquetPMB 16169LibrevilleGabon Rice Research&Training Center(RRTC) 33717 Sakha Kafr SheikhEgypt

Increase grain yield potential is one of the most important objectives of any cereal crop breeding program. To efficiently develop superior rice lines by the introgression of favorable alleles for yield and yield component traits, a strategy of alternate phenotype–genotype selection was used. The present study aimed to(i) investigate the allelic diversity of loci associated with major yield-component traits and(ii) phenotype and genotype advanced populations derived from crosses between NERICA-L-20 and Giza178 for yield component traits using agro-morphological descriptors and GRi SP polymorphic markers to select superior high-yielding rice lines. A total of 100 F2:3 progeny were selected from 1000 F2 plants and genotyped with 16 polymorphic markers linked to four major yield-component traits. Four promising F2:3 lines(ARS 563–14, ARS 563–62, ARS 563–286, and ARS 563–41)bearing combinations of desirable alleles were selected. A selected set of 20 F2:4 lines showed moderate to high heritability for all target traits. Fourteen F2:5 lines derived from ARS 563–14 and 17 F2:5 from ARS 563–286 families were evaluated in preliminary trials to estimate yield gain. The three top lines, ARS 563–286–16-1-1, ARS 563–286–5-1-1, and ARS563–14–10-1-1, showed an increase of more than 10% grain yield over the best check, Sahel108, which is widely cultivated in the Senegal River valley. The 16 markers linked to the target yield component traits can be used to fast-track breeding programs targeting rice productivity.

关键词： Marker Rice Pedigree selection Yield

Acute Toxicity and Behavioural Responses of African Catfish,Clarias gariepinus to Amine Salt of 2,4-D

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应用与环境生物学报 2010年第3期16卷 347-352页

作者： GABRIEL Ugwemgorubong Ujagwung MACAULAY Bonny koffi EDORI Onisogen Simeon Department of Fisheries and Aquatic Environment Rivers State University of Science and Technology Bayelsa State Agricultural Development Programme Ministry of Agriculture Department of Chemistry Rivers State University of Education

Fingerlings of African catfish,Clarias gariepinus [mean total length,(7.0±1.0) cm SD;mean weight,(3.0±0.7) g SD] were exposed to acute concentrations of amine salt of 2,4-D(0,50,200,250,350,and 400 mg/L) to determine the behavioural responses and *** raised in aquaria the fish became *** beat frequencies(opercular and tail beat frequency per minute,OBF and TBF) of the exposed fish declined with increase in the exposure duration and concentration,but the reverse was the case with percent *** variables signifi cantly differed at both the exposure duration and concentration of the toxicant(P<0.05).Anova of the linear regression between variables-OBF,TBF and mortality on exposure duration indicated a strong positive relationship(P<0.001) with the entire variables except mortality and exposure *** and TBF were inversely correlated with exposure duration(r=-0.99;P<0.05).The 96 h lethal concentration was 165.36(133.29～190.51,C.L.) mg/L and the median lethal time at the highest concentration was 20.41(11.87～27.46) *** results from this study revealed that 2,4-D was very toxic to *** under laboratory conditions and its application should therefore,be restricted in the field.

关键词： acute toxicity 2,4-D Clarias gariepinus opercular behavioural change

Improved germination of threatened medicinal Prunus africana for better domestication: effects of temperature, growth regulators and salts

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Journal of Forestry Research 2020年第6期31卷 2403-2411页

作者： Justine Germo Nzweundji koffi Konan Leopold MNyochembeng Nehemie Donfagsiteli Tchinda Nicolas Niemenak Department of Biological Science Higher Teacher Training CollegeUniversity of Yaounde IPO Box 47Yaounde´Cameroon Centre for Research on Medicinal Plants and Traditional Medicine Institute of Medical Research and Medicinal Plants Studies(IMPM)PO Box 6163Yaounde´Cameroon IngateyGen LLC Elizabeth CityNCUSA Department of Natural Resources and Environmental Sciences Alabama A&M UniversityHunstvilleALUSA

Prunus africana is an endangered medicinal species and has been classified as a priority for domestication in ***,the seeds rapidly lose their viability during storage at room temperature after 2–3 *** study aimed to improve seed germination of *** by germinating at different temperatures(4℃,28℃)using different concentrations of growth stimulators(sodium nitrate and gibberellic acid)and different concentrations of *** seeds had 91.7%germination at 4C after 1 month of *** regulators considerably influenced germination after 6 months and reached 66.0%with 10 mM gibberellic acid and 100%with 10 mM sodium *** three shoots per seed were developed,an indication of *** analyses revealed the presence of protein-like bodies close to the embryo axis and accumulations of starch after 7 days of *** 14 days,amyloplasts and dark protein bodies of various sizes were *** outcome of this study will contribute to improve the germination of *** for better domestication and conservation.

关键词： Conservation Germination Growth regulators Histochemical analyses Prunus africana Temperature

Sustainability of Public Debt and Economic Growth in Cote d’Ivoire:is There a Threshold Effect?

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Journal of Economic Science Research 2020年第3期3卷 1-12页

作者： koffi Pokou Dept of Economics University Felix Houphouet BoignyAbidjanCote d’Ivoire

The development of Ivorian public debt in recent years has raised *** its current level capable of boosting the economy or,on the contrary,being at the source of a recession?This paper analyzes the effect of the level of indebtedness on economic growth in Côte d’Ivoire using the Threshold Autoregressive(TAR)model over the period *** results obtained in the short run shed light on the no relationship between public debt and economic *** the long run,on the other hand,there is a bi-directional granger causality between public debt and the sustainability of economic *** non-linearity between the variables of interest has been studied and the results show the presence of a threshold effect:beyond 48.03 percent of GDP,any increase in public debt by 1%should reduce economic growth by 0.28%.Thus,the study questions the relevance of the criterion set by the WAEMU:public debt<70%of GDP.

关键词： Public debt and growth sustainability Threshold Autoregressive(TAR) Granger causality Threshold effects

Land use patterns and tree species diversity in the Volta Geological Unit, Togo

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Journal of Mountain Science 2019年第8期16卷 1869-1882页

作者： FOLEGA Fousseni ATAKPAMA Wouyo WALA Kperkouma MUKETE Beckline SHOZO Shibata AKIRA Osawa ZHAO Xiu-hai AKPAGANA koffi Geomatic and Ecosystems Modeling/Laboratory of botany and Plant Ecology Faculty of SciencesUniversity of LomeLome01BP1515Togo Key Laboratory for Forest Resources&Ecosystem Processes Beijing Forestry UniversityBeijing 100083China Graduate School of Global Environmental Studies Kyoto UniversityKyoto 606-8501Japan Department of Forest Management Beijing Forestry UniversityBeijing 100083China

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.

关键词： Ecological diversity Land use Ecological restoration Forest degradation Togo