BOOK OF ABSTRACTS - iufro landscape ecology conference

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IUFRO Landscape Ecology Working Group International Conference, 2-12 November, 2012 – Concepción, Chilepoint to a possible decrease in the annual mean discharge of Juruá river up to 20% and 18% for the Purusriver. However, if the climate feedbacks are not considered, the simulations show that Juruá and Purusrivers would have an increase in discharge of up to 21% and 23%, respectively, considering a scenario ofabout 40% of forest removal on those sub-basins.Key words: land use change, deforestation, climate, hydrology, rivers.Acknowledgements: This work was supported by grants from the Gordon and Betty Moore Foundation(USA) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior CAPES (Brasil).Evaluation of tendencies of change of the vegetative cover of the Cubillos river basin, municipio ofTausa, Colombia, based on the stochastic transition relationships of Markov's chainsLuis Fernando Ortiz Quintero a *, David Leonardo Valbuena Gaviria b*Corresponding author: a Semillero de investigación Agua y territorio. Universidad Distrital Francisco Joséde Caldas. Bogotá Colombia, b Semillero de investigación Agua y territorio. Universidad Distrital FranciscoJosé de Caldas. Bogotá Colombia.ferortiz3@yahoo.comWe identified and established the trends of change of the vegetative cover for the Cubillos River Basin,located in the mountainous zone of Colombia, for a period of time of 19 years. From the analysis of SPOTimage for the years 1988, 1998, 2004 and 2007, the Basin´s land covers were recognized, initially:forests, paramos, rabble, water bodies, potato crops, and pastures. Later, by means of the creation ofMarkov's matrices and those of temporal stochastic relationships for every sequence of images, wedefined surfaces clusters that allowed us to characterize the configuration and spatial dynamics of thebasin´s covers. The analyses of Markov's matrices and the stochastic systems allowed us to establish thatforests were the most dynamic coverage in the analyzed period of time, presenting a high number ofconnections with other covers of the basin. Equally, we identified a trend of loss of the forests’ largerfragments and the establishment of zones of hanging discharge. The fragmentation of the forest and itsspatial location affect in a negative way the hydrological stability of the basin because the gallery, hydroregulatorforests have been replaced by agriculture. The integrated temporal and spatial analysis of theclasses of coverage on the Cubillos´ basin, realized in this work, indicates that it is necessary to initiatethe management and recovery process of the forest near the water sources and water margins toachieve a stable eco-hydrology of the basin.Key words: basin rivers, vegetativecover, Markov's Chains, stochastic relationships, eco-hydrology.Forest cover and pattern changes in Oluwa Forest Reserve, Southwestern NigeriaOluwagbenga, O.I. Orimoogunje a *, Olusegun Ekanade a*Corresponding author: a Obafemi Awolowo University, Department of Geography, Obafemi AwolowoUniversity, Ile-Ife, Nigeria.orimoogunje2@yahoo.comThis study documents the extent of resource use and the level of degradation for consequent land uses.Three distinctive trends were observed in terms of forest and land-cover dynamics. These are forestdegradation, deforestation, and regeneration. We integrated a topographical map of 1969 and satelliteimagery from Landsat MSS 1972 and Landsat TM 1991 and 2000 with ground truthing and socioeconomicsurveys to assess changes in forest resource use and land cover in Southwestern Nigeria. Thesatellite images were analyzed using ILWIS software version 3.4. Based on ground truth data andremotely sensed data, the study area was classified into five categories using the supervised maximumlikelihood classification technique, according to Tatsuoka (1971). The accuracy assessment was carriedout on the remotely sensed data. A total of 30 points each were selected for this operation and the
IUFRO Landscape Ecology Working Group International Conference, 2-12 November, 2012 – Concepción, Chileoverall accuracy of 90%, 86.7% and 85%, respectively, was obtained from the three image datasets.Results from this study suggest that resource utilization and land cover change dynamically over time.The study also revealed that the creation of forest reserves to restrict local access and resource usewould have been an effective tool for regulating encroachment and logging activities if there was aneffective enforcement of regulation. It follows therefore that the major thrust of environmentalmanagement should be the protection of the natural living space of humankind and integration ofenvironmental scarcity in making decisions on all economic issues and activities.Key words: forest resources, land cover, land utilization, multi-date datasets, sustainability.Acknowledgements: Prof. Olusegun Ekanade was acknowledged for supervising the project from whichthis paper emanated from.Spatial dynamics of forest biomass supply and energy production in Northeastern PortugalJoão C. Azevedo a *, Miguel Vaz Pinto a , Manuel Feliciano a , João Paulo Castro a , Ernesto Escalante b , JoséAranha c*Corresponding author: a Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança ,Campus de Santa Apolónia, 5301-854 Bragança, Portugal, b Escuela Técnica Superior de IngenieríasAgrarias, Universidad de Valladolid, Valladolid, Spain, c Centro de Investigação e de Tecnologias Agro-Ambientais (CITAB), Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal.jazevedo@ipb.ptIt has been shown that, despite its low productivity, the district of Bragança offers favorable conditionsfor the use of forest biomass for energy production. Forests represent 30% of the district’s area, whilepopulation and energy demand are low which makes energy self-sufficiency based on the use of forestbiomass achievable. Forest cover is expected to increase and population to decrease in the near future.The use of biomass for energy production is dependent on spatial factors such as the spatial distributionand productivity of forest stands, the location and size of consumption (urban and industrial), and theinfrastructure network. Spatially explicit analyses of biomass supply are required to address criticalissues in energy planning such as costs, efficiency, and emissions, and to optimize the location and size ofbiomass power plants at the region and <strong>landscape</strong> levels. In this study, we analyzed the dynamics ofpotential biomass supply and energy production in the district of Bragança with the objective ofoptimizing location and size of power plants. Forest cover data was combined with biomass yield dataderived from allometric models and productivity maps generated from geostatistical methods.Optimization was addressed using GIS network analyses based on the road network, location anddimension of forest stands, and energy demand centers. Results indicated that biomass is indeed arelevant potential source of energy in most of the district. Moreover, spatially explicit optimizedlocations were obtained, providing the foundations for sound regional biomass energy planning, ofparticular relevance in a fast-changing <strong>landscape</strong>.Key words: woody biomass for energy, forest biomass, maritime pine, Pinus pinaster, Bragança.Assessing potential riparian ecosystem services using historical land-uses in a tropical regionSilvio Ferraz a *, Katia Ferraz a , Carla Cassiano b , Felipe de Paula b*Corresponding author: a ESALQ/USP, Av. Padua Dias, 11. Piracicaba/SP. 13418-900. Brazil, b ForestResources Graduate Program - ESALQ/USP, Piracicaba, Brazil.silvio.ferraz@usp.br
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