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7 resultados encontrados para: AUTOR: Geoghegan, Jacqueline
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Resumen en: Inglés |
Resumen en inglés

Land system science axiomatically addresses social–environmental systems by integrating the dynamics of land uses (social) and land covers (environment), invariably including the use of remote sensing data and often, spatially explicit models of land change. This kind of research is illustrated through the Southern Yucatán Peninsular Region project (1997–2008) aimed at understanding, predicting, and projecting spatially explicit land change in a region with juxtaposed land uses-agriculture and a biosphere reserve. The successes of the project, its contributions to contemporary land system science, and the organizational mechanisms that fostered the research are identified as well as various corrections, which if applied, may have refined and extended the project's goals. Overall, the project demonstrates the kind of integrated research required to advance understanding of a social-environment system and the team-based methods used in the process.


Resumen en: Inglés |
Resumen en inglés

Land system science axiomatically addresses social– environmental systems by integrating the dynamics of land uses (social) and land covers (environment), invariably including the use of remote sensing data and often, spatially explicit models of land change. This kind of research is illustrated through the Southern Yucata´ n Peninsular Region project (1997–2008) aimed at understanding, predicting, and projecting spatially explicit land change in a region with juxtaposed land uses-agriculture and a biosphere reserve. The successes of the project, its contributions to contemporary land system science, and the organizational mechanisms that fostered the research are identified as well as various corrections, which if applied, may have refined and extended the project’s goals. Overall, the project demonstrates the kind of integrated research required to advance understanding of a social-environment system and the team-based methods used in the process.


3.
Capítulo de libro
*En proceso técnico. Solicítelo con el bibliotecario(a) de SIBE-San Cristóbal
Integrated analysis of ecosystem interactions with land-use change:: The southern Yucatán peninsular region
Lawrence, Deborah ; Vester, Henricus F. M. (coaut.) ; Perez Salicrup, D. (coaut.) ; Eastman, J. Ronald (coaut.) ; Turner II, Billie Lee (coaut.) ; Geoghegan, Jacqueline (coaut.) ;
Contenido en: Ecosystem interactions with land use change. Geophysical Monograph Series 153 / R. DeFries, G. Asner, R. Houghton, (eds.) Washington DC., USA. : American Geophysical Union, 2004 p. 277-292
Nota: En proceso técnico. Solicítelo con el bibliotecario(a) de SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

The southern Yucatán peninsular region is a seasonal tropical forest biome that experiences drought, hurricane, and agricultural disturbance. Substantial agricultural expansion over the past 50 years has opened and fragmented much of the forest surrounding the Calakmul Biosphere Reserve, posing a series of threats to the coupled human-environment systems. These threats are traced in a conceptual model borrowed from vulnerability studies and detailed in regard to ecosystem responses, including forest structure and composition, aboveground biomass, soil nutrients, balance in species and biotic diversity, and invasive species. The land-use and land-cover changes underway pose trade-offs in ecosystem services and raise several scalar issues important to deforestation studies


4.
Libro
Integrated land-change science and tropical deforestation in the Southern Yucatán: final frontiers / edited by B. L. Turner II, Jacqueline Geoghegan and David R. Foster
Turner II, Billie Lee (editor) ; Geoghegan, Jacqueline (editora) ; Foster, David R. (editor) ;
Oxford, England, United Kingdom : Oxford University Press , 2004
Clasificación: Y/333.75137 / I5
Bibliotecas: Campeche , Chetumal , San Cristóbal
Cerrar
SIBE Campeche
ECO040002406 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030000902 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010000042 (Disponible)
Disponibles para prestamo: 1
Índice | Resumen en: Inglés |
Resumen en inglés

This highly topical study of tropical deforestation in Mexico reports on the first phase of the Land-Cover and Land-Use Change in the Southern Yucatan Peninsular Region Project (LCLUC-SYPR): a large, multi-institutional, and team-based study designed to understand and project land changes in a development frontier that pits the rapidly growing needs of smallholder farmers to cut down forests for cultivation against federally sponsored initiatives committed to various international programmes of forest preservation and complementary economic programmes. The SYPR project is a response to inderdisciplinary defined research themes deemed critical to global environmental change and complementary international research agendas (e.g. environment and development, ecosystem assessment, biotic diversity). Pivotal among these agendas are those posed by the Land-Use/Cover Change (LUCC) effort of the International Geosphere-Biosphere Programme and the International Human Dimensions of Global Environmental Change Programme as it is linked through such US sponsors as the National Aeronautics and Space Administration (NASA) and the National Science Foundation (NSF). The themes (i.e. questions and subjects) posed by these programmes and organization are 'integrated' or 'synthesis' in kind, meaning that they rest within the intersection of formal disciplines and are intended to fit into a larger, systems framework about human-environment relationships and the structure and function of the biosphere. The editors of this volume, as most of its contributors, come from the disciplines of geography, ecology, and economics. The lead editor, the geographer B. L. Turner II, has spent most of his career in pursuit of understanding different aspects of tropical deforestation and agriculture.

Índice

1. Introduction Three Frontiers of the Southern Yucatan Peninsular Region and SYPR Project
I: Human-Environment Relationships, 1000 BC - AD 1900
2. The Long View: Human-Environment Relationships 1000 BC - AD 1900
3. Forest Extraction to Theme Parks: The Modern History of Land Change
II: Land-Cover Characteristics and Change
4. Forest Types and their Implications
5. Recovery of Nutrient Cycling and Ecosystem Properties following Swidden Cultivation: Regional and Stand-Level Constraints
6. Land Cover and Land Use: Classification and Change Analysis
III: Agents and Institutions of Land Change: Household Economy and Cultivation
7. Institutions, Organizations, and Policy Affecting Land Change: Complexity Within and Beyond the Ejido
8. The Ejido Household: The Current Agent of Change
9. Subsistence Sustained: Swidden or Milpa Cultivation
10. Jalapeno Pepper Cultivation: Emergent Commercial Land Use
11. The Semi-Market and Semi-Subsistence Household: The Evidence and Test of Smallholder Behavior
IV: Spatial Modeling of Land Change: Empirical Approaches in Data-Sparse Environments
12. Spatially Explicit, Statistical Land-Change Models in Data-Sparse Conditions
13. The SYPR Integrative Assessment Model: Complexity in Development
Retrospective: The Three Frontiers Revisited
Glossary and Acronyms
Index


5.
Libro
People and the environment: approaches for linking household and community surveys to remote sensing and GIS / edited by Jefferson Fox, Ronald R. Rindfuss, Stephen J. Walsh, Vinod Mishra
Disponible en línea: People and the environment: approaches for linking household and community surveys to remote sensing and GIS.
Human Actions and Land-Use/Land-Cover Change (2002) ; Fox, Jefferson (ed.) (1951-) ; Rindfuss, Ronald R. (coed.) ; Walsh, Stephen J. (coed.) ; Mishra, Vinod (coed.) ;
Boston : Kluwer Academic Publishers , c2003
Clasificación: 631.47 / H8
Bibliotecas: Villahermosa
Cerrar
SIBE Villahermosa
ECO050000257 (Disponible)
Disponibles para prestamo: 1
Resumen en: Inglés |
Resumen en inglés

People and the Environment: Approaches for Linking Household and Community Surveys to Remote Sensing and GIS appeals to a wide range of natural, social, and spatial scientists with interests in conducting population and environment research and thereby characterizing (a) land use and land cover dynamics through remote sensing, (b) demographic and socio-economic variables through household and community surveys, and (c) local site and situation through resource endowments, geographical accessibility, and connections of people to place through GIS. Case studies are used to examine theories and practices useful in linking people and the environment. We also describe land use and land cover dynamics and the associated social, biophysical, and geographical drivers of change articulated through human-environment interactions.


6.
Artículo
Deforestation in the southern Yucatán Peninsular region: an integrative approach
Turner II, Billie Lee ; Cortina Villar, Héctor Sergio (coaut.) (1960-) ; Foster, David (coaut.) ; Geoghegan, Jacqueline (coaut.) ;
Clasificación: AR/333.75137 / D4
Contenido en: Forest Ecology and Management Vol. 154, no. 3 (December 2001), p. 353-370 ISSN: 0378-1127
Bibliotecas: Campeche , San Cristóbal
Cerrar
SIBE Campeche
ECO040001538 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010012516 (Disponible) , ECO010003666 (Disponible)
Disponibles para prestamo: 2
Resumen en: Inglés |
Resumen en inglés

The tensions between development and preservation of tropical forests heighten the need for integrated assessments of deforestation processes and for models that address the fine-tuned location of change. As Mexico's last tropical forest frontier, the southern Yucatan peninsular region witnesses these tensions, giving rise to a hot spot of tropical deforestation. These forests register the imprint of ancient Maya uses and selective logging in the recent past, but significant modem conversion of them for agriculture began in the 1960s. Subsequently, as much as 10% of the region's forests have been disturbed anthropogenically. The precise rates of conversion and length of successional growth in both upland and wetland forests are tied to policy and political economic conditions.

Pressures on upland forests are exacerbated by the development of infrastructure for El Mundo Maya, an archaeological and ecological activity predicated on forest maintenance, and by increased subsistence and market cultivation, including lands on the edge of Mexico's largest tropical forest biosphere reserve. In this complex setting, the southern Yucatán peninsular region project seeks to unite research in the ecological, social, and remote sensing sciences to provide a firm understanding of the dynamics of deforestation and to work towards spatially explicit assessments and models that can be used to monitor and project forest change under different assumptions.


7.
- Artículo con arbitraje
Modeling tropical deforestation in the southern Yucatán peninsular region: comparing survey and satellite data
Geoghegan, Jacqueline ; Cortina Villar, Héctor Sergio (coaut.) (1960-) ; Klepeis, Peter (coaut.) ; Macario Mendoza, Pedro A. (coaut.) ; Ogneva Himmelberger, Yelena A. (coaut.) ; Roy Chowdhury, Rinku (coaut.) ; Turner II, Billie Lee (coaut.) ; Vance, Colin (coaut.) ;
Clasificación: AR/333.75137 / M6
Contenido en: Agriculture, Ecosystems and Environment Vol. 85, no. 1-3 (June 2001), p. 25-46 ISSN: 0167-8809
Bibliotecas: Campeche , San Cristóbal
Cerrar
SIBE Campeche
ECO040001672 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010005133 (Disponible)
Disponibles para prestamo: 1
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Resumen en: Inglés |
Resumen en inglés

This paper presents some initial modeling results from a large, interdisciplinary research project underway in the southern Yucatán peninsular region. The aims of the project are: to understand, through individual household surveywork, the behavioral and structural dynamics that influence land managers’ decisions to deforest and intensify land use; model these dynamics and link their outcomes directly to satellite imagery; model from the imagery itself; and, determine the robustness of modeling to and from the satellite imagery. Two complementary datasets, one from household survey data on agricultural practices including information on socio-economic factors and the second from satellite imagery linked with aggregate government census data, are used in two econometric modeling approaches. Both models test hypotheses concerning deforestation during different time periods in the recent past in the region. The first uses the satellite data, other spatial environmental variables, and aggregate socio-economic data (e.g., census data) in a discrete-choice (logit) model to estimate the probability that any particular pixel in the landscape will be deforested, as a function of explanatory variables. The second model uses the survey data in a cross-sectional regression (OLS) model to ask questions about the amount of deforestation associated with each individual farmer and to explain these choices as a function of individual socio-demographic, market, environmental, and geographic variables. In both cases, however, the choices of explanatory variables are informed by social science theory as to what are hypothesized to affect the deforestation decision (e.g., in a von Thünen model, accessibility is hypothesized to affect choice; in a Ricardian model, land quality; in a Chayanovian model, consumer–labor ratio).

The models ask different questions using different data, but several broad comparisons seem useful. While most variables are statistically significant in the discrete choice model, none of the location variables are statistically significant in the continuous model. Therefore, while location affects the overall probability of deforestation, it does not appear to explain the total amount of deforestation on a given location by an individual.