Open Access Original Research Article

Comparative Studies on the Efficacy of Azadirachta indica and Moringa oleifera in Phytoremediation of Some Selected Heavy Metals from Contaminated Soil

Kambai Collina, Francis Mundi Junior, Nkwokwu Henry Nnamdi, Nanlir Janfa

Asian Journal of Environment & Ecology, Page 1-11
DOI: 10.9734/AJEE/2017/37072

This research was carried out to investigate the efficacy of Azadirachta indica (Neem) and Moringa oleifera (Drumstick) in phytoremediation of heavy metals (Ni, Pb and Zn) from the potted contaminated soil. The three selected heavy metals were used to pollute three blocks; each block was subdivided into two subsets of three replicates each per the heavy metal. The two studied plants were transplanted from the nursery into each bag containing contaminated soil. The result of the metal accumulation at the roots of the studied plants indicates that A. indica had the higher mean value of Ni, Pb and Zn absorption (170.0 mg/kg, 119.1 mg/kg and 1.5 mg/kg respectively), whereas the M. oleifera had a lower mean value (0.4 mg/kg, 118.2 mg/kg and 0.9 mg/kg), with no significant difference. The levels of heavy metals in the soil containing A. indica was lower with variation in the level of Pb (p=0.043) but the levels of Zn and Ni (p=0.380 and p=0.144 respectively) was not significant. The bioaccumulation factor shows that A. indica accumulates a higher concentration of heavy metals. This research reveals that both studied plants accumulate high concentration of Ni, Pb and Zn at its root, though A. indica is shown to possess greater ability in accumulating heavy metals.

 

Open Access Original Research Article

Application of SWAT and 3D Environment in Flood Detection Senario of Terengganu Watershed

Ibrahim Sufiyan, Razak Bin Zakariya

Asian Journal of Environment & Ecology, Page 1-18
DOI: 10.9734/AJEE/2017/39135

For many years, the River (Sungai) Terengganu watershed in Malaysia has been flooding and causing great problems to the inhabitants as well as the environment. This study uses the real-time simulation in ArcGIS 10.3 and 3D in ArcScene 10.3, and the variables obtained from the soil and water assessment tool SWAT such as the land use, soil and slope are the parameters measured to induce the flood. When certain portions of the Hydrologic response unit HRU;  land use, soil or slope is changed due to temporal adjustment and climate change, then the model can predict zones of low, moderate and high flood risk. The 3D simulations appear to produce a visual model for decision-making, planning, management, and mitigation.

 

Open Access Original Research Article

Evaluating the Physico-chemical Characteristics and Plankton Diversity of Nwaniba River, South-South Nigeria

I. K. Esenowo, A. A. A. Ugwumba, A. U. Akpan

Asian Journal of Environment & Ecology, Page 1-8
DOI: 10.9734/AJEE/2017/39038

The physicochemical characteristics and plankton diversity of Nwaniba River, Uruan, Akwa Ibom, Nigeria were studied between April and September 2013. Surface water samples were collected for physicochemical parameter and plankton analysis according to standard methods. The results of the physicochemical parameters were within recommended limits of the National Environmental Standards and Regulations Enforcement Agencies (NESREA) for aquatic life. Twenty plankton species belonging to five taxa were encountered in the following order of dominance; Bacillariophyceae (69.23%) > Chlorophyceae (18.38%) > Cyanophyceae (11.97%) > Dinophyceae (0.85%) > Rotifera (0.43%). The most abundant phytoplankton was Coscinodiscus radiates, accounting for 47.7%, the least were Peridinium bipes, Pediastrum duplex, Rivularia spp, Gonatozon monalaenum, Navicular peroltelti, Tabelaria spp, Epithemia zebra and accounting for less than 1% respectively, while Lacane bulla was the only species for zooplankton. High Diversity indices values were recorded for Chlorophyceae =1.36 while the least was Cyanophyceae = 1-21. The presence of certain plankton-pollution tolerant species such as Anabaena circularis, Navicula peroltelti, and Peridinium bipes suggests a low level of organic pollution in the river.

 

Open Access Original Research Article

A Study of Cyclists Activity Involvement, Place Attachment, Satisfaction and Loyalty

Chin- Lung Chou, Hsiao- Ming Chang

Asian Journal of Environment & Ecology, Page 1-10
DOI: 10.9734/AJEE/2017/39304

The purpose of this study is to analyze cyclist’s activity involvement, place attachment and satisfaction, how to affect their loyalty for bikeway. A total of 451 respondents completed a survey conducted on Tanyashen Greenway Bikeway at Taichung City, Taiwan. Using structural equation modeling, the results as follows: (1) the activity involvement had a significant and positive influence on place attachment, satisfaction, and loyalty; (2) cyclists’ place attachment of bikeway had a significant and positive influence on satisfaction, and loyalty; (3) satisfaction had a significant and positive effect on loyalty. The empirical results indicate that the active involvement leads to a greater perception of place attachment and satisfaction and fosters the loyalty of cyclists. Managerial implications with regard to cycling are drawn based on the research findings, and suggestions for future researchers are presented.

 

Open Access Original Research Article

Natural Habitat Vulnerability Modeling Critical to Contingency Planning for Areas Susceptible to Potential Spill Impact from Crude Oil Facilities in Niger Delta Nigeria

John Onwuteaka, Nnaemeka Okeke

Asian Journal of Environment & Ecology, Page 1-12
DOI: 10.9734/AJEE/2017/38635

Natural habitats vulnerability to the oil spill was performed using the ArcGIS 10.3.1 and its Spatial Analyst extension. The input variables were land use land cover imagery, pipelines, wellheads and a flow station. The oil spill was modeled as a function of spread through land uses. Impedance function was applied to oil spill spread through the landscape for an oil well, pipeline and flow station. Total function risk was modeled as the iteration of aggregate oil facility cost surface (likelihood) and environmental sensitivity cost surface (consequence). Three classes generated were high, medium and low vulnerability surfaces. The surfaces were used to extract land-use and landcover susceptible to any potential spill impact from three scenarios generated within three buffer zones of 50meter, 100m and 150 meter using GIS overlay techniques. Each vulnerability surface within the defined buffers was able to quantify pixels of land-use and landcover types susceptible to the risk of a potential oil spill. When utilized correctly at an appropriate scale and spatial resolution, raster-pixel based vulnerability surfaces have the potential to be effective tools in Contingency planning and response to inland oil spills.