Urban expansion and shrinkage of vegetation cover in Al-Balqa Governorate, the Hashemite Kingdom of Jordan

2019 ◽  
Vol 78 (21) ◽  
Author(s):  
Yusra Al-husban
Keyword(s):  
Vegetation Cover ◽  
Urban Expansion

scholarly journals Assessing the relative role of climate and human activities on vegetation cover changes in the up down stream of Danjiangkou, China

2021 ◽  
Author(s):  
Hai Liu ◽  
Feng Liu ◽  
Hongmeng Yuan ◽  
Liang Zheng ◽  
Yuan Zhang
Keyword(s):  
Influencing Factors ◽  
Human Activities ◽  
Vegetation Cover ◽  
Vegetation Index ◽  
Central City ◽  
Urban Expansion ◽  
Water Diversion ◽  
Relative Role ◽  
Dynamic Changes ◽  
Protection Measures

Abstract Aims Danjiangkou Reservoir is water source of Middle Route Project of the South-to-North Water Diversion (SNWD) Project, research on the dynamic changes in vegetation cover and its influencing factors is of great significance for understanding the ecological environment of the water diversion area and formulating protection measures. Methods In this study, the normalized difference in vegetation index (NDVI) was used to analyse the dynamic changes and influencing factors of vegetation in the upstream and downstream of Danjiangkou Dam from 1982 to 2018. Important Findings The results showed that the NDVI exhibited an upward trend of 0.017 year -1 (P < 0.05), and that the significantly increased area was located near the valley upstream of the dam, while the significantly decreased area was mainly distributed in the basin downstream of the dam and around the central city. The comprehensive contributions of climate and human activity factors to NDVI changes were 92.03% and 7.97%, respectively. The human activities in the upstream of the dam were mainly reflected in the ecological measures such as returning farmland to forest; the human activities at the downstream of the dam were mainly reflected in urban expansion, occupation of cultivated land and forest land by construction land.

scholarly journals The Heterogeneous Impact of High-Speed Railway on Urban Expansion in China

2021 ◽  
Vol 13 (23) ◽  
pp. 4914
Author(s):  
Dan He ◽  
Zixuan Chen ◽  
Jing Zhou ◽  
Ting Yang ◽  
Linlin Lu
Keyword(s):  
Significant Role ◽  
Vegetation Cover ◽  
High Speed ◽  
Urban Expansion ◽  
Urban Land ◽  
Cultivated Land ◽  
High Speed Railway ◽  
Barren Land ◽  
Multi Stage ◽  
The Impact

High-speed railway (HSR) promote the efficient flow of the population and materials between cities and have profoundly affected urban economic development in China. However, there is currently limited research about how HSR influences urban expansion, especially related to the variable impacts on different urban agglomerations, different size cities, and the conversion of non-urban land to urban land. In this study, from two levels of regional heterogeneity and type heterogeneity, a multi-stage difference-in-differences (multi-stage DID) model and land use remote sensing data are used to investigate these research areas. The main conclusions are as follows: (1) The first opening of HSR had a more significant role in promoting urban expansion than HSR frequency, but several years after opening, HSR no longer promotes urban expansion. (2) The opening of HSR only played a significant role in promoting urban expansion in Beijing–Tianjin–Hebei. HSR frequency had a significant role in promoting urban expansion in the Yangtze River Delta. (3) The opening of HSR had no significant impact on urban expansion for different size cities, and HSR frequency only had a significant negative impact on urban expansion of small cities. (4) The first opening of HSR led to urban expansion dominated by the occupation of cultivated land. Cities in Xinjiang and Inner Mongolia mainly converted barren land and vegetation cover to urban land after the first opening of HSR. In northeast China, the first opening of HSR made the conversion of vegetation cover and cultivated land to urban land roughly equivalent in size. The results of this study are helpful to understand the impact of the first opening of HSR and the scale of conversion of different types of non-urban land into urban land on urban expansion. In the era of HSR, these findings provide a valuable reference for regional planning and preventing the disorderly expansion of cities.

scholarly journals MAPPING AND VEGETATION COVER INDEX FROM CÁCERES CITY, MATO GROSSO STATE (MT), BRAZIL

GEOGRAFIA ◽  
2018 ◽  
Vol 42 (3) ◽  
pp. 113-127
Author(s):  
William James VENDRAMINI ◽  
Sandra Mara Alves da Silva NEVES ◽  
Jesã Pereira KREITLOW ◽  
Edinéia Aparecida dos Santos GALVANIN ◽  
João Santos Vila da SILVA
Keyword(s):  
Urban Space ◽  
Vegetation Cover ◽  
Financial Support ◽  
Census Data ◽  
Urban Expansion ◽  
Remote Sensing Images ◽  
Mato Grosso ◽  
Municipal Planning ◽  
High Resolution Images ◽  
Anthropic Action

Analyzing the urban space related to its own growth allows to identify the identification of the dynamics of the natural elements and the way the intensified anthropic action shapes and at the same time degrades the landscape, which in the present study is the Pantanal biome. The objective of this study is to use high resolution images and vegetation cover indexes to analyze the urban expansion of Cáceres/MT, and to generate financial support for municipal planning and management. For the execution of this research, remote sensing images and a Geographic Information System (GIS) were used, as well as demographic census data. The urban expansion contributed to the removal of 19.62% of the vegetation and to the increase of 15.28% of anthropic use. The Caceres Vegetation Cover Index is high, with vegetation percentages above 30% occurring in 74.42% of the neighborhoods. From the date of the study on the Index of Vegetation Cover for Inhabitant (ICVH) decreased by 37.20%, remained at 32.55% and increased by 30.25%. It was concluded that an increase in the use of urban space contributed to the reduction of vegetation, as well as the decrease of the population associated to the vegetation of the neighborhoods influenced on the decrease of the ICVH

scholarly journals Trend Analysis of Las Vegas Land Cover and Temperature Using Remote Sensing

Land ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 135 ◽  
Author(s):  
Haroon Stephen
Keyword(s):  
Remote Sensing ◽  
Land Cover ◽  
Trend Analysis ◽  
Vegetation Cover ◽  
Urban Areas ◽  
Las Vegas ◽  
Residential Buildings ◽  
Urban Expansion ◽  
Rate Of Change ◽  
Barren Land

The Las Vegas urban area expanded rapidly during the last two decades. In order to understand the impacts on the environment, it is imperative that the rate and type of urban expansion is determined. Remote sensing is an efficient and effective way to study spatial change in urban areas and Spectral Mixture Analysis (SMA) is a valuable technique to retrieve subpixel landcover information from remote sensing images. In this research, urban growth trends in Las Vegas are studied over the 1990 to 2010 period using images from Landsat 5 Thematic Mapper (TM) and National Agricultural Imagery Program (NAIP). The SMA model of TM pixels is calibrated using high resolution NAIP classified image. The trends of land cover change are related to the land surface temperature trends derived from TM thermal infrared images. The results show that the rate of change of various land covers followed a linear trend in Las Vegas. The largest increase occurred in residential buildings followed by roads and commercial buildings. Some increase in vegetation cover in the form of tree cover and open spaces (grass) is also seen and there is a gradual decrease in barren land and bladed ground. Trend analysis of temperature shows a reduction over the new development areas with increased vegetation cover especially, in the form of golf courses and parks. This research provides a useful insight about the role of vegetation in ameliorating temperature rise in arid urban areas.

scholarly journals Assessing the Relative Role of Climate and Human Activities on Vegetation Cover Changes in the Up-down Stream of Danjiangkou, China

2021 ◽  
Author(s):  
Hai Liu ◽  
Hongmeng Yuan ◽  
Liang Zheng ◽  
Yuan Zhang
Keyword(s):  
Influencing Factors ◽  
Human Activities ◽  
Vegetation Cover ◽  
Vegetation Index ◽  
Central City ◽  
Urban Expansion ◽  
Water Diversion ◽  
Relative Role ◽  
Dynamic Changes ◽  
Protection Measures

Abstract Danjiangkou Reservoir is water source of Middle Route Project of the South-to-North Water Diversion (SNWD) Project, research on the dynamic changes in vegetation cover and its influencing factors is of great significance for understanding the ecological environment of the water diversion area and formulating protection measures. In this study, The normalized difference vegetation index (NDVI) was used to analyze the dynamic changes and influencing factors of vegetation in the upstream and downstream of Danjiangkou Dam from 1982 to 2018. The results show that the NDVI shows an upward trend of 0.017 year-1 (P < 0.05), and the significantly increased area is located near the valley upstream of the dam, while the significantly decreased area is mainly distributed in the basin downstream of the dam and around the central city. The comprehensive contributions of climate and human activity factors to NDVI changes were 92.03% and 7.97%, respectively. The human activities in the upstream of the dam are mainly reflected in the ecological measures such as returning farmland to forest; the human activities at the downstream of the dam are mainly reflected in urban expansion, occupation of cultivated land and forest land by construction land.

scholarly journals DETERMINATION OF FACTORS RESPONSIBLE FOR THE CHANGE IN VEGETAL COVER IN KATSINA TOWN

2020 ◽  
Vol 4 (3) ◽  
pp. 636-644
Author(s):  
A. S. Mmaduabuchi ◽  
Yusuf Bello ◽  
A. Yaro
Keyword(s):  
Population Growth ◽  
Vegetation Cover ◽  
Linear Time ◽  
Carbon Sink ◽  
Rank Order ◽  
Urban Expansion ◽  
Negative Relationship ◽  
Population Data ◽  
Landsat Satellite ◽  
Increasing Trends

The study examined the factors responsible for change in vegetation cover between 1999 and 2019.  Decadal data for climatic variable (rainfall and temperature), Landsat satellite images and population data of 1999, 2009 and 2019 were used. Land use/Land cover Change Detection, linear time series and Spearman rank order correlation analysis were used. The results revealed that the extent change between (1999-2009) and (2009-2019) for built-up, vegetation and bare surface were; (+91.66, +276.41), (-4.06, -40.42) and (-27.44, -23.5) respectively. There were increasing trends in the built-up environment, population growth and rainfall at the rate of (19.3 km2 per-10), (110116 persons per-10) and (231.5mm per-10) respectively. There were decrease trend of temperature and vegetation cover at the rate of (-1.15oC per-10) and (-19.3 km2 per-10) respectively.  Negative relationship exist between population growth (r = -0.938), built up (r = -0.987), rainfall (r = -0.982) and vegetation cover, while positive relationship exist between temperature (r = 0.965) and vegetation cover. The study conclude that temperature is the major factor influencing the loss in vegetation cover, rapid population growth and urban expansion were experienced during the study period. The study recommend five (5) trees should be planted per built-up structure in order to create more carbon sink and to improve vegetal resource which were affected by human activities and  changing climatic variables

EFFECTS OF URBAN EXPANSION ON VEGETATION COVER LOSS IN LAGOS STATE, NIGERIA

2020 ◽  
Vol 10 ◽  
pp. 146
Author(s):  
Waheed Akanni Salami ◽  
Mobolaji Atinuke Tayo-Badru ◽  
Clement Olabinjo Adeofun ◽  
Olusegun Oguntoke
Keyword(s):  
Land Use ◽  
Absorption Coefficient ◽  
Vegetation Cover ◽  
Urban Expansion ◽  
Water Bodies ◽  
Open Area ◽  
Entire Study ◽  
Consumption Ratio ◽  
Land Consumption ◽  
Total Study Area

Urbanization is a significant human activity affecting the environment. The study analyzes land use/land cover changes and examines built-up expansion through multi-temporal Landsat images spanning 1985 to 2015. In order to assess the pattern of urbanization, land consumption ratio (LCR) and land absorption coefficient (LAC) have been estimated. In 1985, vegetation cover occupied 54.70%, water bodies accounted for 22.10%, and built-up/open area accounted for 15.80% of the total study area. However, in 2015, vegetation and water bodies reduced drastically to 42.60% and 17.90% while there was a geometric progression in built-up/open area accounting for 39.50% of the entire study area. Also, between 1985-2015, vegetation cover and water bodies declined by 0.74% and 0.63% while the built-up/open area increased at an average rate of 4.99% per annum. The analysis of land consumption ratio revealed that built-up expansion has led to a high level of consumption of vegetation cover and water bodies at the rate of 0.016, 0.007 and 0.006 in 1985, 2000 and 2015 respectively. Similarly, land absorption coefficient accounted for 0.002 and 0.005 between the periods of 1985-2000 and 2000-2015. The rate of  land acquisition indicates that development is high over the 30 years leading to a decline of green areas. If the present trend continues, it will lead to severe degradation of urban micro-biome, especially wetland resources, hence the call for a proper land-use policy for Lagos and other similar megacities in Nigeria.

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