Land cover change in two protected areas of Guinea-Bissau (1956-1998)

Vasconcelos, Maria J.; Biai, J.C Mussá; Araújo, Adrilayne dos Reis; Diniz, M. A.

doi:10.1016/s0143-6228(02)00005-x

Cited by 62 publications

(47 citation statements)

References 6 publications

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“…We can note the growing influence of rural activities, the frequency of dry periods and local government strategies and management and conservation of the environment. These findings confirm the studies of [39]. To monitor and map the successive states of the plant cover in sub watershed Agnack, we opted for a diachronic analysis from satellite images processing.…”

Section: Discussionsupporting

confidence: 75%

Dynamics of Land use Around the Micro-Dam Anti-Salt in the Sub-Watershed of Agnack Lower Casamance (Senegal)

Sambou¹

2015

AJRS

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Agriculture, mainly based on rain, is one the most important economic activities in Lower Casamance region. Its agricultural production is vulnerable to climatic variability. The water management has become an important issue for rural populations food security. This research aims at the characterization of environmental evolution and agricultural production, around the anti-salt micro-dams in Lower Casamance area, which has a high rainfall and a rich potential of water resources. This study examines the hydro-agricultural planning issues in Lower Casamance and aims at the analysis of the land use change and its evolution in the Agnack sub-basin around anti-salt micro-dam between 1984 and 2010. Based on the importance of rice production area around micro-dams, the analysis focus on eight sites. Using satellite imagery Landsat TM of 1984 and 1992 and ETM of 2000 and 2010 combined with ground, socio-economic survey and soil analysis data, this research investigates land use change through image classifications, change detection and landscape pattern analysis. We conducted a mapping of the rice paddies to determine the evolution of riceland during these dates. Through a pseudo-supervised classification coupled with field data, we characterized the different types of land use and cover. Results of land use/cover change analysis showed a decrease of riceland area; while there is a relative vegetation regeneration between 1984 and 2010. The soil analysis showed a deterioration in soil quality which is showed by a very high acidity in all sites and a soil salinity of riceland in the upstream developed valleys. Socio-economic surveys showed the importance of the micro-dams. In the term, the micro-dam did not achieve the expected results. It could not solve the problem of degraded soil desalination and intensification of rice growing.

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Section: Discussionsupporting

confidence: 75%

Dynamics of Land use Around the Micro-Dam Anti-Salt in the Sub-Watershed of Agnack Lower Casamance (Senegal)

Sambou¹

2015

AJRS

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“…It could be interesting, as a future development of our research, to implement studies which assume N2Ss as reference spatial units [11,[74][75][76][77][78][79] and to compare outcomes and implied consequences.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Natura 2000 Sites on Land-Taking Processes at the Regional Level: An Empirical Analysis Concerning Sardinia (Italy)

Lai

Zoppi

2017

Sustainability

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This article focuses on the role that the provisions of the Natura 2000 Network play in affecting land-taking processes by looking at the Italian region of Sardinia, where strict rules on land development have been enforced since 1993 through regional landscape plans and where an extensive Natura 2000 Network, covering nearly 19% of the regional land mass, was established in compliance with Directive 92/43/EEC on the conservation of natural habitats and of wild fauna and flora and Directive 2009/147/EC on the conservation of wild birds. The results and inferences of our study could be easily generalized to other European Union regions, provided that similar geographic datasets are available. By shedding some light on the relation between land take on the one hand, and nature conservation and landscape protection on the other, it is possible to enhance regional planning policies to prevent or hinder land-taking processes, and, by doing so, to help implementing the European Commission recommendation on no net land take by 2050 into the EU regional policies.

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“…Because of good results on the regional scale, particularly in combination with detailed ground information as reference input, visual-interpretation methods are used extensively to map complex ecosystems [20,40,116,117,120]. Also, simple unsupervised and supervised classification methodologies are frequently used for mangrove mapping [3,12,16,21,106,110,111,119,121].…”

Section: Methodsmentioning

confidence: 99%

Remote Sensing of Mangrove Ecosystems: A Review

et al. 2011

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Mangrove ecosystems dominate the coastal wetlands of tropical and subtropical regions throughout the world. They provide various ecological and economical ecosystem services contributing to coastal erosion protection, water filtration, provision of areas for fish and shrimp breeding, provision of building material and medicinal ingredients, and the attraction of tourists, amongst many other factors. At the same time, mangroves belong to the most threatened and vulnerable ecosystems worldwide and experienced a dramatic decline during the last half century. International programs, such as the Ramsar Convention on Wetlands or the Kyoto Protocol, underscore the importance of immediate protection measures and conservation activities to prevent the further loss of mangroves. In this context, remote sensing is the tool of choice to provide spatio-temporal information on mangrove ecosystem distribution, species differentiation, health status, and ongoing changes of mangrove populations. Such studies can be based on various sensors, ranging from aerial photography to high-and medium-resolution optical imagery and from hyperspectral data to active microwave (SAR) data. Remote-sensing techniques have demonstrated a high potential to detect, identify, map, and monitor mangrove conditions and changes during the last two decades, which is reflected by the large number of scientific papers published on this topic. To our knowledge, a recent review paper on the remote sensing of mangroves does not exist, although mangrove ecosystems have become the focus of attention in the context of current climate change and discussions of the OPEN ACCESSRemote Sens. 2011, 3 879 services provided by these ecosystems. Also, climate change-related remote-sensing studies in coastal zones have increased drastically in recent years. The aim of this review paper is to provide a comprehensive overview and sound summary of all of the work undertaken, addressing the variety of remotely sensed data applied for mangrove ecosystem mapping, as well as the numerous methods and techniques used for data analyses, and to further discuss their potential and limitations.

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Land cover change in two protected areas of Guinea-Bissau (1956-1998)

Cited by 62 publications

References 6 publications

Dynamics of Land use Around the Micro-Dam Anti-Salt in the Sub-Watershed of Agnack Lower Casamance (Senegal)

Dynamics of Land use Around the Micro-Dam Anti-Salt in the Sub-Watershed of Agnack Lower Casamance (Senegal)

The Influence of Natura 2000 Sites on Land-Taking Processes at the Regional Level: An Empirical Analysis Concerning Sardinia (Italy)

Remote Sensing of Mangrove Ecosystems: A Review

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