IMPACTS OF URBAN DEVELOPMENT ON AN OXBOW LAKE IN THE AMAZON REGION: LANDSCAPE AND GEOCHEMICAL EVIDENCE

2020 ◽  
Vol 7 (2020) (2) ◽  
pp. 1-12
Author(s):  
Marcondes Costa ◽  
◽  
Luiz Carvalho ◽  
Patricia Pereira ◽  
Glayce Valente ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Urban Development ◽  
Amazon Basin ◽  
Urban Expansion ◽  
Oxbow Lake ◽  
Human Consumption ◽  
Lake Area ◽  
Fish Farms ◽  
Muddy Water ◽  
The Impact

Amapá Lake is an abandoned meander of the Acre River, the margins of which are occupied by agricultural settlements, smallholdings, fish farms and dirt roads. This paper discusses the impact of this occupation on the lake area based on field data and physical-chemical and elementary chemical analyses of the lake and river waters. The strong physical changes in the lake landscape have impacted the quality of its water. During the dry season (low water), when the temperature of the water reaches 30-34ºC, there is a proliferation of green algae and in the area affected by fish farms and smallholdings there is an increase in total dissolved solids, electrical conductivity, and transparency, while turbidity and total suspended solids become more concentrated during the flood season. The anthropogenic impact is also indicated by the higher levels of ammonia, chlorides, bromides, and phosphates in the water. However, the concentrations of dissolved metal ions are all consistent with those found in the Acre River, and other muddy water lakes and rivers in the Amazon basin, reflecting the mineralogy of the suspended material. The concentrations of most heavy metals (Pb, Cu, (Zn), Cd and Hg) are below 0.01 mg L-1, while that of Hg (0.006 mg L-1) is above the recommended limits for human consumption. Overall, the results of the study indicate that Amapá Lake is suffering ongoing impacts (physical and chemical) from urban development, which are mitigated by the periodic flooding of the river. Key words: Urban expansion, Environmental impacts, Waters, Heavy metals.

Carbon Emission and Urban Construction Land Expansion in China: Evidence from Co-Integration Tests and Impulse Response Model

2014 ◽  
Vol 1010-1012 ◽  
pp. 1883-1888
Author(s):  
Wen Wen Qiu
Keyword(s):  
Urban Development ◽  
Impulse Response ◽  
Carbon Emission ◽  
Industrial Structure ◽  
Urban Expansion ◽  
Response Analysis ◽  
Causality Test ◽  
Construction Land ◽  
Urban Construction ◽  
The Impact

Using co-integration analysis, Granger causality test, and impulse response analysis in an integrated way, this paper makes empirical study of the impact on China’s carbon emission by its urban construction land expansion. The result shows that there is a long-run equilibrium relationship between carbon emission and urban construction land expansion in China, with the latter being the Granger cause of the increase in carbon emission. However, the impact process shows a lagging nature. The impact effect is not so evident in a short term, but is rather significant in a long term (five to ten years). To reduce its carbon emission, China should optimize its urban development mode and control the scale of urban development reasonably, especially focusing on the economical and intensive use of land and upgrading of industrial structure, so as to reduce energy consumption by its urban expansion, check excessive increase in carbon emission, and promote the sustainable urbanization.

scholarly journals URBANISATION BEYOND ITS CORE BOUNDARY AND ITS IMPACT ON THE COMMUNITIES IN GEORGE TOWN CONURBATION, MALAYSIA

2019 ◽  
Vol 17 (10) ◽  
Author(s):  
Narimah Samat ◽  
Mohd Amirul Mahamud ◽  
Siti Masayu Rosliah Abdul Rashid ◽  
Yasin Elhadary ◽  
Norzailawati Mohd Noor
Keyword(s):  
Urban Development ◽  
Urban Growth ◽  
Urban Expansion ◽  
Economic Benefits ◽  
Inclusive Development ◽  
Spatial Expansion ◽  
Qualitative Approaches ◽  
Core Boundary ◽  
George Town ◽  
The Impact

Rapid urbanisation has raised major issues, especially in cities in developing nations. In Malaysia, for example, the urbanisation rate is at 74%, but the size of urban land is less than 10%. This phenomenon has caused urban expansion to encroach on to its fringe areas. At present, although much has been said about the economic benefits of urban expansion to the fringe areas, yet little is known about its impact on the local communities. This paper aims to highlight the spatial expansion of George Town Conurbation and to investigate how local inhabitants perceive urban development. This study used satellite images and GIS techniques to identify the spatial expansion of urbanisation in George Town. Quantitative and qualitative approaches of data collection were employed to investigate the impact of urbanisation on the communities. The findings indicated that the inhabitants in less urbanized states welcome urban expansion, as they perceive that urban growth generates more jobs and brings economic opportunities. On the contrary, those who have experienced a longer period of urban development did not fully welcome urbanisation. Therefore, inclusive development policies are required to ensure that urban growth will benefit dwellers in the urban area as well as in its surroundings. In addition, they are required to safeguard the environment.

THE ECOLOGICAL IMPACT ASSESSMENT OF URBAN DEVELOPMENT POLICIES: A CASE STUDY OF JI'NAN CITY, CHINA

2009 ◽  
Vol 11 (04) ◽  
pp. 427-450 ◽  
Author(s):  
SHUJUN WANG ◽  
JENNIFER LI ◽  
DAQIAN WU ◽  
RENQING WANG ◽  
KAI ZHANG ◽  
...  
Keyword(s):  
Ecosystem Services ◽  
Urban Development ◽  
Impact Assessment ◽  
Urban Expansion ◽  
Ecological Impact ◽  
Environmentally Friendly ◽  
Ecological Impact Assessment ◽  
Development Policies ◽  
The Impact

Based on socio-economic development and population growth, rapid urbanisation is currently happening in China, leading to urban expansion and land use changes. This, in turn, affects biodiversity, habitats and ecosystem services. It is therefore important to identify and assess the impact of urban development policies (UDP) on ecosystems and their components at a policy level. Ji'nan City, the capital of Shandong Province in Northern China, has been taken as a case study for assessing the ecological impact of UDP. The study found that, influenced by the traditional economy-oriented development strategy, the former UDP of Ji'nan City was mainly focused on urban socio-economic growth by speeding up the construction of urban infrastructure facilities, expanding urban built-up areas as well as strengthening the development of resource- and pollution-intensive industry, which in turn has negatively influenced the ecosystem services. The promulgation of eco-environmentally friendly UDP would contribute to protect and maintain the ecosystems and their components. Finally, recommendations for informing the legislation of new environmentally friendly UDPs and furthering the implementation of ecological impact assessment (EcIA) in China are proposed.

scholarly journals Transfer of Some Toxic Metals from Soil to Honey Depending on Bee Habitat Conditions

2020 ◽  
Vol 24 (1) ◽  
pp. 49-59
Author(s):  
Monika Tomczyk ◽  
Grzegorz Zaguła ◽  
Czesław Puchalski ◽  
Małgorzata Dżugan
Keyword(s):  
Heavy Metals ◽  
Toxic Metals ◽  
Soil Acidity ◽  
Background Level ◽  
Metal Mobility ◽  
Human Consumption ◽  
Habitat Conditions ◽  
Natural Background ◽  
Heavy Metal Mobility ◽  
The Impact

AbstractThe transfer of toxic metals from soil to honey was studied based on two different areas of the Podkarpackie region located in the south-east part of Poland: U-urbanized and E-ecologically pure. The metal content was determined using the ICP-OES method with prior microwave mineralization of the soil, plant (goldenrod, dandelion, rapeseed, tilia and fir), bee bodies and honey samples collected from 10 sampling points (U-5 and E-5). The impact of soil pH on heavy metal mobility was also evaluated. It was found that Podkarpackie soils are less contaminated with heavy metals as compared to other regions of Poland and only in the case of cadmium an enhancement of the natural background level was observed. The migration of heavy metals, especially cadmium, in the soil-plant-bee-honey food chain was accelerated by soil acidity (p<0.05). The influence of human activity (region development) on heavy metals concentrations was not significant (p>0.05). Based on bioaccumulation factors, goldenrod and dandelion plants were confirmed as cadmium accumulators. It was also confirmed that the bodies of bees act as an effective barrier to the migration of heavy metals from the environment to honey, due to this, honey is free from these metals and safe for human consumption.

scholarly journals URBANISATION BEYOND ITS CORE BOUNDARY AND ITS IMPACT ON THE COMMUNITIES IN GEORGE TOWN CONURBATION, MALAYSIA

2019 ◽  
Vol 17 ◽  
Author(s):  
Narimah Samat ◽  
Mohd Amirul Mahamud ◽  
Siti Masayu Rosliah Abdul Rashid ◽  
Yasin Elhadary ◽  
Norzailawati Mohd Noor
Keyword(s):  
Urban Development ◽  
Urban Growth ◽  
Urban Expansion ◽  
Economic Benefits ◽  
Inclusive Development ◽  
Spatial Expansion ◽  
Qualitative Approaches ◽  
Core Boundary ◽  
George Town ◽  
The Impact

Rapid urbanisation has raised major issues, especially in cities in developing nations. In Malaysia, for example, the urbanisation rate is at 74%, but the size of urban land is less than 10%. This phenomenon has caused urban expansion to encroach on to its fringe areas. At present, although much has been said about the economic benefits of urban expansion to the fringe areas, yet little is known about its impact on the local communities. This paper aims to highlight the spatial expansion of George Town Conurbation and to investigate how local inhabitants perceive urban development. This study used satellite images and GIS techniques to identify the spatial expansion of urbanisation in George Town. Quantitative and qualitative approaches of data collection were employed to investigate the impact of urbanisation on the communities. The findings indicated that the inhabitants in less urbanized states welcome urban expansion, as they perceive that urban growth generates more jobs and brings economic opportunities. On the contrary, those who have experienced a longer period of urban development did not fully welcome urbanisation. Therefore, inclusive development policies are required to ensure that urban growth will benefit dwellers in the urban area as well as in its surroundings. In addition, they are required to safeguard the environment.

Impact of heavy metals on the food web in the Mediterranean lagoon, Lake Burullus, Egypt

2020 ◽  
Vol 49 (3) ◽  
pp. 215-229
Author(s):  
Mahmoud H. Hegab ◽  
Nasr M. Ahmed ◽  
Shadia M. Kadry ◽  
Radwa A. ElSayed ◽  
Mohamed E. Goher
Keyword(s):  
Heavy Metals ◽  
Lake Water ◽  
Dry Weight ◽  
Human Consumption ◽  
Fish Muscles ◽  
Fish Samples ◽  
Accumulation Of Metals ◽  
Lake Burullus ◽  
The Impact ◽  
The Relationship

AbstractResearch on the impact of heavy metals and their accumulation in ecosystem elements of Lake Burullus is still scarce. Therefore, this study focuses on the relationship between the levels of heavy metals in the lake water, plankton communities and Nile tilapia (Oreochromis niloticus). The mean annual concentrations of Fe, Zn, Cu, Mn, Pb and Cd in water and fish samples were 527.8, 366.7, 162.6, 137.3, 119.8 and 3.6 μg l−1, and 70.8, 43.6, 8.05, 1.2, 0.14 and 0.045 μg g−1 dry weight (d.w.), respectively. The study demonstrated the relationship between the accumulation of metals in fish muscles and their levels in the lake water (p < 0.05; r = 0.7–0.9), with the metal content in O. niloticus muscles being mostly below the permissible limits. The obtained results showed that the levels of the metals in the lake water are not correlated with phytoplankton and zooplankton, and their groups, except copper and zinc, are negatively correlated with phytoplankton (r = −0.45 and −0.58, respectively). The study concluded that the concentrations of the analyzed metals in Lake Burullus did not reach the effective levels that would have a significant impact on the distribution of phytoplankton and zooplankton, or a hazardous effect on O. niloticus and its safety for human consumption.

scholarly journals Impact of Land Use Change Due to Urbanisation on Surface Runoff Using GIS-Based SCS–CN Method: A Case Study of Xiamen City, China

Land ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 839
Author(s):  
Sabita Shrestha ◽  
Shenghui Cui ◽  
Lilai Xu ◽  
Lihong Wang ◽  
Bikram Manandhar ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Urban Development ◽  
Surface Runoff ◽  
Hydrological Cycle ◽  
Urban Expansion ◽  
Eastern China ◽  
Spatial And Temporal Variation ◽  
The Impact ◽  
Scs Cn

Rapid urban development results in visible changes in land use due to increase in impervious surfaces from human construction and decrease in pervious areas. Urbanisation influences the hydrological cycle of an area, resulting in less infiltration, higher flood peak, and surface runoff. This study analysed the impact of land use change due to urbanisation on surface runoff, using the geographic information system (GIS)-based soil conservation service curve number (SCS–CN) method, during the period of rapid urban development from 1980 to 2015 in Xiamen, located in south-eastern China. Land use change was analysed from the data obtained by classifying Landsat images from 1980, 1990, 2005, and 2015. Results indicated that farmland decreased the most by 14.01%, while built-up areas increased the most by 15.7%, from 1980 to 2015. Surface runoff was simulated using the GIS-based SCS–CN method for the rainfall return periods of 5, 10, 20, and 50 years. The spatial and temporal variation of runoff was obtained for each land use period. Results indicate that the increase in surface runoff was highest in the period of 1990–2005, with an increase of 10.63%. The effect of urbanisation can be realised from the amount of runoff, contributed by built-up land use type in the study area, that increased from 14.2% to 27.9% with the rise of urban expansion from 1980 to 2015. The relationship between land use and surface runoff showed that the rapid increase in constructed land has significantly influenced the surface runoff of the area. Therefore, the introduction of nature-based solutions such as green infrastructure could be a potential solution for runoff mitigation and reducing urban flood risks in the context of increasing urbanization.

Агрономическая эффективность промышленной (голландской) технологии возделывания картофеля

2018 ◽  
Author(s):  
C. Coy ◽  
A.V. Shuravilin ◽  
O.A. Zakharova
Keyword(s):  
Heavy Metals ◽  
Regression Analysis ◽  
Positive Response ◽  
Growth Yield ◽  
Correlation And Regression Analysis ◽  
Yield And Quality ◽  
Quality Of Products ◽  
High Degree ◽  
The Impact

Приведены результаты исследований по изучению влияния промышленной технологии возделывания картофеля на развитие, урожайность и качество продукции. Выявлена положительная реакция растений на подкормку K2SO4 в период посадки. Корреляционно-регрессионный анализ урожайности и качества клубней выявил высокую степень достоверности результатов опыта. Содержание нитратов и тяжелых металлов в клубнях было ниже допустимых величин.The results of studies on the impact of industrial technology of potato cultivation on growth, yield and quality of products. There was a positive response of plants to fertilizer K2SO4 in the period of planting. Correlation and regression analysis of yield and quality of tubers revealed a high degree of reliability of the results of experience. The contents of nitrates and heavy metals in tubers was below the permissible values.

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