Global Journal of Environmental Sciences最新文献_第8页

Evidence of health risk in stored domestic water in Maiduguri , North Eastern Nigeria 尼日利亚东北部迈杜古里储存的生活用水存在健康风险的证据

Global Journal of Environmental Sciences Pub Date : 2006-03-08 DOI: 10.4314/GJES.V4I2.2459

N. E. Nwaiwu, O. Olanrewaju

引用次数: 1

Environmental mineralogy of unconsolidated surface sediments associated with the 2001 landslides on volcanic cones, Mabeta New Layout, Limbe, Cameroon 与2001年火山锥滑坡相关的松散地表沉积物环境矿物学，喀麦隆Limbe Mabeta New Layout

Global Journal of Environmental Sciences Pub Date : 2006-03-08 DOI: 10.4314/GJES.V4I2.2450

G. Ekosse, V. Ngole, Y. Sendze, S. Ayonghe

{"title":"Environmental mineralogy of unconsolidated surface sediments associated with the 2001 landslides on volcanic cones, Mabeta New Layout, Limbe, Cameroon","authors":"G. Ekosse, V. Ngole, Y. Sendze, S. Ayonghe","doi":"10.4314/GJES.V4I2.2450","DOIUrl":"https://doi.org/10.4314/GJES.V4I2.2450","url":null,"abstract":"Samples of unconsolidated surface sediments from the 2001 landslide occurrences in the Mabeta New Layout, Limbe, Cameroon were studied using sediment colour characterization as well as x-ray powder diffraction (XRPD) and optical microscopy (OM) techniques in order to ascertain mineral phases contained in them and postulate any influence the minerals may have had in triggering off the event. In terms of colour characterization, the hue/value/chroma of the sediments ranged from 5YR/5/3 to 5YR/4/6 to 5YR/3/4 with corresponding colour shades from reddish-brown to yellowish-red to dark reddish brown. Results of XRPD indicated that the samples consisted of the following mineral phases: anatase, annite, augite, goethite, hematite and kaolin, with the Fe-bearing minerals being dominant. Traces of maghemite were found in a few of the samples, and clinopyroxene was identified in the saprolite. The OM results confirmed those obtained for colour characterization and minerals identification. The findings of the study depict that hydrologic, tectonic and seismic factors combined with the physical properties of the mineral assemblages in triggering the landslides. These physical properties included the shapes and sizes of the mineral particles as well as mineral density. Keywords : landslides, unconsolidated sediments, saprolite, x-ray diffraction Global Journal of Environmental Sciences Vol. 4(2) 2005: 115–122","PeriodicalId":12569,"journal":{"name":"Global Journal of Environmental Sciences","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2006-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78760095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

An analysis of rainfall patterns in Nigeria 尼日利亚的降雨模式分析

Global Journal of Environmental Sciences Pub Date : 2006-03-08 DOI: 10.4314/GJES.V4I2.2455

P. Odjugo

{"title":"An analysis of rainfall patterns in Nigeria","authors":"P. Odjugo","doi":"10.4314/GJES.V4I2.2455","DOIUrl":"https://doi.org/10.4314/GJES.V4I2.2455","url":null,"abstract":"The paper is designed to study the rainfall patterns and its implications in Nigeria. Rainfall data from 28 stations for the period of 1970 – 2002 were collected from the Nigeria Meteorological Station, Lagos. While the vegetation map of Nigeria between 1973 and 1995 forms the basis of biodiversity change analysis. The results among others show that rainfall decreases from 1350 mm (1941–1970) to 1276 mm (1970–2002). While there is a general decrease in rainfall in Nigeria, the coastal area is experiencing slight increase. Apart from the general southward shift in rainfall patterns, the duration has also reduced from 80-360 (1941-1970) to 40-280 (1970-2002) rainy days per year. This has created ecological destabilisation and altered the pattern of the vegetation belt especially in the northern fringes of the country. The rainfall pattern has also enhanced wind erosion/desertification, soil erosion and coastal flooding in the north, east and coastal areas of Nigeria respectively. With these impacts, the paper therefore recommends some adaptive and mitigation measures that could help to revert the current situation. Keywords : changing climate, vegetation belts, rainfall pattern and shift Global Journal of Environmental Sciences Vol. 4(2) 2005: 139-145","PeriodicalId":12569,"journal":{"name":"Global Journal of Environmental Sciences","volume":"59 1","pages":"139-145"},"PeriodicalIF":0.0,"publicationDate":"2006-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85623230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 42

A comparative analysis of eco-toxicity of crude oil pollution on the chlorophyll biosynthesis in two agro-forestry species 原油污染对两种农林复合树种叶绿素生物合成的生态毒性比较分析

Global Journal of Environmental Sciences Pub Date : 2006-03-08 DOI: 10.4314/GJES.V4I2.2452

N. Edwin-Wosu, Pds Kinako

{"title":"A comparative analysis of eco-toxicity of crude oil pollution on the chlorophyll biosynthesis in two agro-forestry species","authors":"N. Edwin-Wosu, Pds Kinako","doi":"10.4314/GJES.V4I2.2452","DOIUrl":"https://doi.org/10.4314/GJES.V4I2.2452","url":null,"abstract":"A short-term ecological study was conducted to ascertain the degree of envisaged impact of petroleum pollution to biota (macrophyte) in a polluted habitat. The biosynthetic process in chlorophyll content reflects the level of the photosynthetic activities. It was envisaged that such biosynthetic process of pigment formation could become a sensitivity index to any polluted environment. To this end, this study has elucidated the importance of petroleum on photosynthetic capacity of two agroforestry species ( Leucaena leucocephala and Bauhinia monandra ). The relative accumulation of the pigments was used to evaluate the influence of petroleum on the biosynthetic process of the plant species in focus. Results have established (with the variation in the optical transmittance of the pigment) the concentration of the chlorophyll pigment in various pollution intensities. The result showed 4792 mg/g in the control for L. leucocephala . 3195 mg/g, 1118 mg/g and 958 mg/g with percentage depression of 58.6%, 68.7% and 76.5% in the respective (25, 50 and 100 ml) pollution levels. B. monandra had 1438 mg/g in the control. 1118, 958 mg/g and 479 mg/g) and (%) depression of 59.9 69.0 and 78.1 (%) respectively. The variations in the species pigment content indicate the predicament of both species and consequently their sensitivity potential to a polluted habitat. Hence such index provides a means of determining the importance of petroleum in accounting for photosynthetic rate and yield potential under environmental condition. Keywords : Leucaena leucocephala , Bauhinia monandra , chlorophyll, crude oil toxicity, oil pollution Global Journal of Environmental Sciences Vol. 4(2) 2005: 127–130","PeriodicalId":12569,"journal":{"name":"Global Journal of Environmental Sciences","volume":"39 1","pages":"127-130"},"PeriodicalIF":0.0,"publicationDate":"2006-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73269302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Rainfall analysis for environmental applications in Maiduguri, Nigeria 尼日利亚迈杜古里环境应用的降雨分析

Global Journal of Environmental Sciences Pub Date : 2006-03-08 DOI: 10.4314/GJES.V4I2.2458

N. E. Nwaiwu, A. Bitrus

引用次数: 1

A Comparative Study Of Soil Electrical Conductivity And Salinity In Predominant And Non-Predominant Crude Oil Areas Of Akwa Ibom State Of Nigeria 尼日利亚阿夸伊博姆州原油优势区和非优势区土壤电导率和盐度的比较研究

Global Journal of Environmental Sciences Pub Date : 2005-06-17 DOI: 10.4314/GJES.V4I1.2436

U. E. Akpan

引用次数: 0

Petrographic And Physico-Chemical Characterisation Of Tailings Dump And Soils Around A Nickel-Copper Mining And Smelting Environment 镍铜矿山冶炼环境周围尾矿库和土壤的岩石学和理化特征

Global Journal of Environmental Sciences Pub Date : 2005-06-17 DOI: 10.4314/GJES.V4I1.2438

G. Ekosse

引用次数: 1

Assessing The Ecological Status Of Woody Plant Species At Eroded Sites Of Abia And Imo States, Nigeria 尼日利亚阿比亚州和伊莫州侵蚀地木本植物生态状况评估

Global Journal of Environmental Sciences Pub Date : 2005-06-17 DOI: 10.4314/GJES.V4I1.2445

M. Dike

{"title":"Assessing The Ecological Status Of Woody Plant Species At Eroded Sites Of Abia And Imo States, Nigeria","authors":"M. Dike","doi":"10.4314/GJES.V4I1.2445","DOIUrl":"https://doi.org/10.4314/GJES.V4I1.2445","url":null,"abstract":"Woody plant species up to 0.10 m and above in height growing in and within 0.5 m from the edges of ten gully erosion areas of Abia and Imo states of Nigeria were enumerated in January and July 2000 through July 2003. Questionnaires were served to find the causal factors of each gully. The plants were enumerated and classified into their life form. The index of similarity according to Sorensen was used to determine the similarity of the sites. It was observed that a combination of factors contributed to form a gully. The gullies were caused by discharge from road culverts, 80%; run off from building, 70%; footpath, 60%; deforestation, 30% and flood 10%. A total of 49 plant families comprising 100 species were identified at the sites. The families Cyperaceae and Euphorbiaceae had the highest representation of species. The Phanerophytes, Therophytes and Chamaephytes were represented by 57.5%, 23.8% and 13.7%, respectively. A combination of grasses such as Acroceras zizanioides, Cynodon dactylon and Perotis indica and some tree species such as Antiaris toxicaria, Entandrophragma utile, Gossweilerodendron balsamiferum, Khaya ivorensis, Nauclea diderrichii and Terminalia superba were recommended for planting in and near gullies at a espacement of 1.0 x 1.0 m. The slope angle ranged from 55 to 122 degrees. The sites were similar. Variations in the species composition were not recorded within the studied period. The study revealed that some previous attempts to control gully erosion with Gmelina arborea failed because many of the trees were carried into the gullies by flood. It was concluded that the use of monoculture plant species in erosion control project should be minimized. KEY WORDS: Woody plant, erosion, gullies and enumeration. Global Journal of Environmental Sciences Vol.4(1) 2005: 77-85","PeriodicalId":12569,"journal":{"name":"Global Journal of Environmental Sciences","volume":"86 1","pages":"77-85"},"PeriodicalIF":0.0,"publicationDate":"2005-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85512610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Quantal Response Of Freshwater Shrimp ( Desmocaris trispinosa ) To Toxicity Of Azo Dyes 淡水虾(Desmocaris trispinosa)对偶氮染料毒性的定量响应

Global Journal of Environmental Sciences Pub Date : 2005-06-17 DOI: 10.4314/GJES.V4I1.2439

C. Ogugbue, N. Oranusi

引用次数: 0

Effect Of Inhalation Exposure To Kerosene And Petrol-Fumes On Some Anaemia-Diagnostic Indices In Rats 吸入暴露于煤油和汽油烟雾对大鼠某些贫血诊断指标的影响

Global Journal of Environmental Sciences Pub Date : 2005-06-17 DOI: 10.4314/GJES.V4I1.2442

F. Uboh, P. Ebong, O. U. Eka, E. Eyong, M. Akpanabiatu

引用次数: 29