Land cover changes and landscape pattern dynamics in Senegal and Guinea Bissau borderland

Cabral, Ana I. R.; Costa, Fernando Lagos

doi:10.1016/j.apgeog.2017.03.010

Cited by 75 publications

(37 citation statements)

References 25 publications

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“…Landscape metrics characterize the spatial configuration of a landscape [47], and have proved effective means for quantifying urban form [48,49]. Based on existing literature addressing urban form [50,51,52,53], seven common landscape metrics were selected to measure urban form in this study: total area (TA), perimeter-area fractal dimension (PAFRAC), area-weighted mean fractal dimension index (AWMFDI), mean perimeter-area ratio (MPARA), patch density (PD), landscape division index (DIVISION), and splitting index (SPLIT).…”

Section: Methodsmentioning

confidence: 99%

Examining the Impacts of Urban Form on Air Pollution in Developing Countries: A Case Study of China’s Megacities

Zhou¹,

Li²,

Wang³

2018

IJERPH

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Urban form is increasingly being identified as an important determinant of air pollution in developed countries. However, the effect of urban form on air pollution in developing countries has not been adequately addressed in the literature to date, which points to an evident omission in current literature. In order to fill this gap, this study was designed to estimate the impacts of urban form on air pollution for a panel made up of China’s five most rapidly developing megacities (Beijing, Tianjin, Shanghai, Chongqing, and Guangzhou) using time series data from 2000 to 2012. Using the official Air Pollution Index (API) data, this study developed three quantitative indicators: mean air pollution index (MAPI), air pollution ratio (APR), and continuous air pollution ratio (CAPR), to evaluate air pollution levels. Moreover, seven landscape metrics were calculated for the assessment of urban form based on three aspects (urban size, urban shape irregularity, and urban fragmentation) using remote sensing data. Panel data models were subsequently employed to quantify the links between urban form and air pollution. The empirical results demonstrate that urban expansion surprisingly helps to reduce air pollution. The substitution of clean energy for dirty energy that results from urbanization in China offers a possible explanation for this finding. Furthermore, urban shape irregularity positively correlated with the number of days with polluted air conditions, a result could be explained in terms of the influence of urban geometry on traffic congestion in Chinese cities. In addition, a negative association was identified between urban fragmentation and the number of continuous days of air pollution, indicating that polycentric urban forms should be adopted in order to shorten continuous pollution processes. If serious about achieving the meaningful alleviation of air pollution, decision makers and urban planners should take urban form into account when developing sustainable cities in developing countries like China.

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Section: Methodsmentioning

confidence: 99%

Examining the Impacts of Urban Form on Air Pollution in Developing Countries: A Case Study of China’s Megacities

Zhou¹,

Li²,

Wang³

2018

IJERPH

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“…Landscape fragmentation describes the land-use spatial structure and provides information about land-use categories in the given region. In this context, landscape fragmentation indicators can be used as valuable variables to quantify the occurrence probability and contribute to improving and enhancing the knowledge of land-use changes [24,25]. In the study, the driving factors of landscape fragmentation include patch densities (PD) of croplands, forestlands, grasslands, water bodies, construction lands and Shannon's diversity index (SHDI).…”

Section: Clue-s Modelmentioning

confidence: 99%

Simulating Spatial-Temporal Changes of Land-Use Based on Ecological Redline Restrictions and Landscape Driving Factors: A Case Study in Beijing

Jia

Zhang

et al. 2018

Sustainability

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Abstract:A change in the usage of land is influenced by a variety of driving factors and policies on spatial constraints. On the basis of considering the conventional natural and socio-economic indicators, the landscape pattern indicators were considered as new driving forces in the conversion of land use and its effects at small regional extent (CLUE-S) model to simulate spatial and temporal changes of land-use in Beijing. Compared with traditional spatial restrictions characterized by small and isolated areas, such as forest parks and natural reserves, the ecological redline areas increase the spatial integrity and connectivity of ecological and environmental functions at a regional scale, which were used to analyze the distribution patterns and behaviors of land use conversion in the CLUE-S model. The observed results indicate that each simulation scenario has a Kappa coefficient of more than 0.76 beyond the threshold value of 0.6 and represents high agreements between the actual and simulated land use maps. The simulation scenarios including landscape pattern indicators are more accurate than those without consideration of these new driving forces. The simulation results from using ecological redline areas as space constraints have the highest precision compared with the unrestricted and traditionally restricted scenarios. Therefore, the CLUE-S model based on the restriction of ecological redline and the consideration of landscape pattern factors has shown better effectiveness in simulating the future land use change. The conversion of land use types mainly occurred between construction land and cropland during the period from 2010 to 2020. Meanwhile, a large number of grasslands are being changed to construction lands in the mountain towns of northwest Beijing and large quantities of water bodies have disappeared and been replaced by construction lands due to rapid urbanization in the eastern and southern plains. To improve the sustainable use of land resources, it is necessary to adopt the construction and development mode of satellite towns rather than encouraging a disorderly expansion of downtown areas.

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“…To reveal the temporal and spatial distribution law of the evolution of a landscape pattern for a certain area or a certain land cover type (such as forest land and grassland), scholars have conducted extensive research on this aspect. The relevant results show that the degree of landscape fragmentation in a certain area is positively correlated to its urbanization level, and its fragmentation trend is closely related to human interference activities in the past few decades [6,7]. An increase in construction leads to the overall fragmentation of regional ecological landscapes.…”

Section: Introductionmentioning

confidence: 99%

Spatial Differentiation of Land Use and Landscape Pattern Changes in the Beijing–Tianjin–Hebei Area

et al. 2020

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Landscape pattern analysis based on geometric features effectively reflects the spatial patterns of land use. Based on the administrative boundaries of prefecture-level cities, the Beijing–Tianjin–Hebei collaborative development area is divided into three sub-regions, according to ecological–production–living functions. We used remote sensing data of long time series land-use change from late 1980 to 2015, and analyzed landscape pattern changes and spatial differentiation in the past 30 years. The results show that: (1) The main type of land-use change was the flow of cultivated land to urban construction land, and the urbanization process was significant. (2) The urban construction land was the landscape type with the highest degree of fragmentation and maximum land-use change in the region. (3) The patch density in the Beijing–Tianjin–Hebei area increased while the average patch area decreased, and the entire landscape tended towards significant fragmentation. The Shannon diversity and evenness indexes continued to increase, indicating that the overall landscape in this region is heterogeneous and diversified. The ecological and environmental protection measures implemented in this region so far have achieved results, but require more stringent measures to ensure the total diversification of land use in the region.

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Land cover changes and landscape pattern dynamics in Senegal and Guinea Bissau borderland

Cited by 75 publications

References 25 publications

Examining the Impacts of Urban Form on Air Pollution in Developing Countries: A Case Study of China’s Megacities

Examining the Impacts of Urban Form on Air Pollution in Developing Countries: A Case Study of China’s Megacities

Simulating Spatial-Temporal Changes of Land-Use Based on Ecological Redline Restrictions and Landscape Driving Factors: A Case Study in Beijing

Spatial Differentiation of Land Use and Landscape Pattern Changes in the Beijing–Tianjin–Hebei Area

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