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1.
Inspired by Ostrom’s concept of polycentric governance, this article aims to refine the analytical framework through which contemporary access to land is analysed. By drawing on extensive fieldwork and conducting a review of the existing literature on the making and implementation of Tanzania’s 1999 land reform, it challenges some of the main assumptions behind the land access and land grabbing literatures about the level at which agency is placed. Processes governing access to land are more contingent than they are most often depicted, involving actors at the local, national and international levels. National and local level actors are often more important than, in particular, the land grab literature tends to suggest. This implies that the state should be seen not merely as a site of ‘legitimate theft’, but also as one in which rights may be upheld. Based on the experience of Tanzania, the article suggests that analytical a priori assumptions about where agency is placed should be abandoned and replaced with empirical research into the relations between actors at all levels.  相似文献   

2.
Natural Hazards - Urban land surface temperature (LST) is dependent on many factors, including land cover, building materials, urban density, and other human activities. The current study evaluated...  相似文献   

3.
Land use and land cover changes are local and place specific, occurring incrementally in ways that often escape our attention. This study sought to detect changes in land cover in the Tema Metropolis of Ghana from 1990 to 2010. Multispectral Landsat Thematic Mapper data sets of 1990, 2000 and 2007 were acquired, pre-processed and enhanced. Unsupervised classification of the images was performed and six land cover classes (water, wetlands, closed vegetation, open vegetation, cropped lands, and built-up) were derived. The post-classification change detection technique was performed to derive the changes in land cover and their corresponding change matrices. Between 1990 and 2010, built-up areas expanded steadily to become the most prevalent land cover type in the metropolis, reducing vegetation cover dramatically. High population growth with its attendant rise in the demand for housing, and increasing commercial activities, were found to have influenced land cover changes over the period.  相似文献   

4.
It is crucial that today’s land uses are not decoupled even further from prevailing site conditions. Quite the contrary, the site-adequate use of natural resources ought to be mandatory. This is provided for to a certain extent by the concept of multifunctionality and the exploitation of locational geological potential. Nevertheless, an appropriate course of action has yet to be taken. This can be achieved by applying an appropriate geo-based land use concept. To this end, however, from the scientific perspective alone, there has to be a new level of quality in the interaction between the various specialist disciplines to resolve the nexus problem and to achieve systemic approaches. The gap between the knowledge available in geology and the aspired land use concepts appears to be particularly large. A land use concept that pursues a systemic approach and refers to an adequate extent to geological knowledge provides options for future site-adequate land use as the basis for respective decision-makers or decision-making processes, not any longer conducted by political constraints or economic incentives only.  相似文献   

5.
Agricultural land use in much of Brong-Ahafo region, Ghana has been shifting from the production of food crops towards increased cashew nut cultivation in recent years. This article explores everyday, less visible, gendered and generational struggles over family farms in West Africa, based on qualitative, participatory research in a rural community that is becoming increasingly integrated into the global capitalist system. As a tree crop, cashew was regarded as an individual man’s property to be passed on to his wife and children rather than to extended family members, which differed from the communal land tenure arrangements governing food crop cultivation. The tendency for land, cash crops and income to be controlled by men, despite women’s and young people’s significant labour contributions to family farms, and for women to rely on food crop production for their main source of income and for household food security, means that women and girls are more likely to lose out when cashew plantations are expanded to the detriment of land for food crops. Intergenerational tensions emerged when young people felt that their parents and elders were neglecting their views and concerns. The research provides important insights into gendered and generational power relations regarding land access, property rights and intra-household decision-making processes. Greater dialogue between genders and generations may help to tackle unequal power relations and lead to shared decision-making processes that build the resilience of rural communities.  相似文献   

6.
G.J. Kukla 《Earth》1977,13(4):307-374
At least seventeen glacials and seventeen interglacials occurred in Europe over the last 1.7 million years. Eight glacials and eight interglacials are of Brunhes age. Only four glacials and three interglacials are recognized by classical Alpine and north European subdivisions of the Pleistocene. The classical units are correlated with continuous oxygen isotope records from the oceans using loess sections and terraces as a link (cf. Fig. 21). It is found that: (1) the terraces representing the four Alpine “glacial” stages fully cover the last 0.8 million years but correspond to both glacial and interglacial climates; (2) the Alpine “interglacial” stages do not represent episodes of interglacial climate but probably intervals of accelerated crustal movements; (3) the physical evidence on which the north European classical subdivision is based accounts for only about 15% of the time represented. This has led to serious miscorrelations.It is urgently recommended to abandon the classical terminology in all interregional correlations and to base the chronostratigraphic subdivision of Pleistocene on the18O record of deep-sea sediments.  相似文献   

7.
Land disputes are among the primary issues that Land Administration Systems attempt to accommodate. They derive from a variety of purposes including law, history, culture, traditions, administration and local geographical characteristics. There is no uniform approach in addressing land disputes and each country implements different resolution techniques. Ecclesiastical and monastic institutions throughout the world are owners of immense real estate property to such an extent that can indeed affect land administration policies. Greece is in the limelight of international attention due to its economical crisis and actually under pressure to modernise its dysfunctional land policy framework and create a stable investment environment. Within this framework, this paper investigates issues hindering proper land administration in Greece through the examination of a the resolving process regarding a case study in the island of Crete; a complex legal land dispute between the Greek State, two ecclesiastical institutions, a monastery and a church, and squatters took place, lasting for nearly 40 years. In order to evaluate this procedure and its impact on the development of the disputed area, a variety of data sources were accumulated and processed through time-based analysis. In this direction, cadastral survey’s contribution was examined along with land use change analysis, indicating how uncertainties in securing property rights on land, result in illegalities and trespassing posing significant barriers in land administration and management in the course of time. Although old and ambiguous in describing land boundaries the monasterial documentation might be, it proved sufficient to prevail over other litigants claims; the monastery was even adjudicated more than twice the size of the area that was claiming. By this investigation process, the distinct role of ecclesiastical institutions in Greece regarding land acquisition and the defects and malfunctions within Greek Land Administration System are presented. The paper concludes with the authors’ suggestions for addressing similar real estate property situations concerning land disputes.  相似文献   

8.
In Ghana, the contested concepts of “land grabbing” and “land transaction” are strategically applied by proponents of critical and win–win discourses respectively to describe outcomes of land deals. Using case study methods and discourse analysis, this paper explores four cases of biofuels investments in Ghana and the implications of the choice of concepts used to represent them. Proponents of the critical discourse use the “land grabbing” concept to invoke imageries of “illegality”, “theft” and “food insecurity” when describing land deals. Consequently, some biofuels investments have been hampered in their potential to generate profit and local employment. The biofuel investors in this study, whose projects have been labeled “land grabbing”, therefore switched to food production to downplay public scepticism. Proponents of the win–win discourse portray biofuels investments as “pro-poor” projects and use the “land transaction” concept to pre-empt possible public criticisms in the media and elsewhere. Such representations of these biofuels investments are therefore mainly intended to pre-empt criticisms or attract public praise. Some projects with potentially promising outcomes have thus been terminated, while others with problematic outcomes have continued to be promoted. In contexts characterized by weak land regulations and ambivalence towards large-scale agriculture, the trajectory and outcomes of biofuels investments are often influenced by land deal representations drawn from global discourses and how they interact with pre-existing local discourses.  相似文献   

9.
Most studies on the causes of deforestation have sought to link the phenomenon to specific economic, political, or demographic factors, usually through statistical or spatial-statistical modeling. However, generalizations about the link between deforestation and specific variables or classes of variables are of questionable validity. Another approach, one that is receiving growing attention, seeks instead to identify particular contexts or situations, as created by an array of interacting factors, which encourage forms of land use or other economic activity that can generate deforestation pressure. Such an approach was used in this study to explore recent trends and dynamics in the Petén region of northern Guatemala. The research found a number of regional and national scale factors that in combination have led to a process of de-agrarianization and dispossession among smallholders, while large scale, commercial activities in agriculture, ranching and plantation forestry increasingly dominate. Rapid land concentration, in conjunction with limited employment generation through emergent activities, is intensifying pressure on remaining areas of forest. A focus on two distinct areas within Petén reveals how broader-scale trends and features can have differing outcomes at the local level, with contrasting socioeconomic and environmental effects. Finally, the paper explores the implications of recent dynamics in Petén for both policy and theory in relation to deforestation, agrarian change, and regional development. Key factors and questions are highlighted that should be considered when exploring influences on regional socioeconomic and environmental conditions.  相似文献   

10.
The present Dutch approach is often addressed in Europe as an example of practical, innovative and cost effective soil management. During the last 25 years of finding the best practices the Dutch soil clean-up policy evolved from a sectoral soil remediation program, managed and financed mainly by the central government and provinces, towards an integrated contaminated sites management approach, managed by local and regional bodies, financed by tax money and private investments. The contamination perception evolved from very strict demands on ＂full remediation＂ to the more pragmatic and practical concept of reducing or eliminating risks associated with contamination to the acceptable levels for humans and ecosystem, the so-called ＂Risk based management＂. The environmental regulatory system is presently undergoing trough considerable modifications towards integrated risk based management to satisfy the changing needs of the Dutch society and to correspond with the new European legislation as Water Framework Directive, Waster Directive and EU Soil Strategy. Dutch Policy Development, Netherlands has a long history of contaminated land management. In the year of 1979 the major obstructions for finding successful solutions for soil contamination problems were： Absence of knowledge about contamination behaviour and fate in the natural environment and as a consequence incapability to make priorities and sound decisions. Absence of experience in treating soil contamination. Not enough financial resources to clean everything according to the standards set in the legislation. During the last 25 years of finding the best practices the Dutch went through a complex process of developing realistic, affordable and practical approaches towards soil contamination. Dutch soil clean-up policy evolved from a sectoral soil remediation program,  相似文献   

11.
The Antarctic continent and surrounding oceans,which are cold and isolated from human activities,constitute a key region for multidisciplinary investigations.Since the early interest during the International Geophysical Year （IGY） during 1957-1958,numerous scientific studies have so far been carried out in Antarctica by different countries,which have provided important insights into Earth and environmental processes such as regional climate warming and its effect to biodiversity,changes in ice sheet and ocean circulation,ozone depletion,and origin and evolution of continents.The challenge of the next phase of Antarctic research will be to integrate all fields of science into a holistic understanding of Earth and life processes of the Antarctic region.In this thematic issue of Geoscience Frontiers,we assemble a set of scientific papers related to geomorphology,biology,molecular spectroscopy,and geology reflecting the recent research activity in the Antarctic region.  相似文献   

12.
The spatial knowledge of the relationships between geodiversity and land use/land cover diversity may become crucial to forming modern land use policies and consequently, it may also become fruitful in regional development. But, there is no work in the literature that emphasises the relationships between geodiversity and land use/land cover diversity, especially in a country like India which has a large variety of abiotic elements and also has a large variety of land use/land cover patterns in its territory and hence, has tremendous scope for such kind of work. Therefore, in the present work to partially fill the research gap, an attempt has been made to explore the relationships between geodiversity and land use/land cover diversity of the Birbhum district, India following the principles of richness index. The spatial correlations between geodiversity and land use/land cover diversity have been examined statistically by applying both correlation and regression analyses. The result shows a linear positive correlation between geodiversity and land use/land cover diversity of the concerned district that implies the fact that the areas of high geodiversity are also associated with the areas of high land use/land cover diversity and vice versa.  相似文献   

13.
Natural Hazards - Analysis of the run-out of landslides is essential and vital for disaster mitigation. However, accurate run-out analysis is difficult because of the uncertainty of earthquake...  相似文献   

14.
Das  Tapas  Jana  Antu  Mandal  Biswajit  Sutradhar  Arindam 《GeoJournal》2021,87(4):765-795

Urbanization produces substantial land use changes by causing the construction of different urban infrastructures in the city region for habitation, transportation, industry, and other reasons. As a result, it has a significant impact on Land Surface Temperature (LST) by disrupting the surface energy balance. The objective of this paper is to assess the impact of land-use/land-cover (LU/LC) dynamics on urban land surface temperature (LST) of Bhubaneswar City in Eastern India during 30 years (1991–2021) using Landsat data (TM, ETM + , and OLI/TIRS) and machine learning algorithms (MLA). The finding reveals that the mean LST over the entire study domain grows significantly between 1991 and, 2021due to urbanization (β coefficient 0.400, 0.195, 0.07, and 0.06 in 1991, 2001, 2011, and 2021 respectively) and loss of green space (β coefficient − 0.295, − 0.025, − 0.125 and − 0.065 in 1991, 2001, 2011 and 2021 respectively). The highest class recorded for agricultural land (49.60 km2, accounting for 33.94% of the total land area) was in 1991 followed by vegetation (41.27 km2, 28.19% of the total land area), and built-up land (27.59 km2, 18.84% of the total land area). The sharp decline of vegetation cover will continue until 2021 due to increasing built-up areas (r = − 0.531, − 0.329, − 0.538, and − 0.063 in the 1991, 2001, 2011 and 2021 respectively). Built-up land (62.60 km2, accounting for 42.76% of the total land area, an increase of 35.01 km2 from 1991) as the highest class followed by water bodies (21.57%, 32.60 km2 of the land area), and agricultural land (31.57 km2, 21.57% of the land area) in 2021. Remote sensing techniques proved to be an important tool to urban planners and policymakers to take adequate steps to promote sustainable development and minimize urbanization influence on LST. Urban green space (UGS) can help improve the overall liveability and environmental sustainability of Bhubaneswar city.

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15.
Journal of Earth System Science - The artificial recharge is a technique of aquifer conservation for land subsidence. But in this article, the phenomenon of land subsidence and the resulting cracks...  相似文献   

16.
The morphology of Vamanapuram river basin (VRB), southern Kerala, India has been studied by preparing longitudinal profiles from the source of VRB at Chemmunji Mottai (1,717 m) to its mouth at Muthalapallipozhy (Lakshadweep Sea). Survey of India topographical maps, Geocoded Satellite Imageries, Microsoft Excel and GIS software ILWIS 2.1 are used in this study. The morphometric analysis reveals that there are 1,489, 347, 79, 21, 6, 2 and 1 first-, second-, third-, fourth-, fifth-, sixth- and seventh-order streams, respectively, in VRB, which are responsible for the present-day landform genesis. The mean bifurcation value of VRB is 3.49. The Ponmudi hills receive the highest rainfall in VRB in the Western Ghats Region and Attingal, the lowest in the Coastal Strand Plain. The six land use and land cover profile sections show the distribution of land use–land cover with respect to elevation and depth to water level. The study reveals that mid and high lands generally occupy lower order streams up to fourth order and generally originate from linear ridge, hill crest, rocky slope (scarp face), side slope (S3)/slope 10–15° and hilly terrain.  相似文献   

17.
The weighted sum already incorporated into a geographical information system (GIS) makes it possible to identify the best lands useful for sustainable agriculture. However, it does not allow for the inclusion of the decision makers’ preferences so that a choice can be made when there are conflicts between decision makers. Because of their spatial aggregation functions, multicriteria decision analysis methods can facilitate decision making in situations where several solutions are available, various criteria have to be taken into account, and decision makers disagree about one point or another. Combinations between ArcGIS and multicriteria analysis methods in this case Elimination Et Choix Traduisant la Realité (ELECTRE TRI) and a version of the weighted sum method simple additive weighting, applicable to the vector data model, have been established. The parameters and the classification system of Food and Agriculture Organization are used in this work. This approach has been tested on the area of Mleta in Algeria. Land suitability maps for durum wheat have been produced. Through the comparison between results obtained by these two methods and those available in a classical method, based on manual overlay procedures, it appears that optimistic procedure of the ELECTRE TRI method is better suited to the problem of land suitability for agriculture.  相似文献   

18.
Nicol Morton 《《幕》》2008,31(4):420-422
The Jurassic is traditionally famous for shallow marine sediments that are often very fossiliferous, notably in Europe, where the standard chronostratigraphic subdivisions were established and defined. However, widespread marginal and non-marine Jurassic sediments are also known, and are of great importance for the wellpreserved terrestrial biotas they contain, as well as for their hydrocarbon and coal reserves. IGCP Project 506 is directed towards finding means of correlation between marine and non-marine Jurassic rocks, as a foundation for a better understanding of the evolution of the Earth during the Jurassic Period.  相似文献   

19.
Ohne Zusammenfassung  相似文献   

20.
The paper deals with the geological setting, history and subsidence of the Venetian Plain. Major attention is paid to the Pleistocene-Holocene stratigraphic sequence in the Lagoon of Venice, in relation to its origin that datesback to 6-7 kyr BP. Geological land subsidence, which played an important role in the origin and the evolution of the lagoon, and anthropogenic subsidence, that has recently assumed a major importance for the Venetian environment, are discussed. Considering also the sealevel rise, 23 cm loss in land elevation has occurred in the last century, leading to increased flooding events and environmental problems that require protective works.  相似文献   

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