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Articles 31 - 60 of 76
Full-Text Articles in Social and Behavioral Sciences
Modeling Watershed-Scale Sequestration Of Soil Organic Carbon For Carbon Credit Programs, Vineet Yadav, George Malanson, Elias Bekele, Christopher Lant
Modeling Watershed-Scale Sequestration Of Soil Organic Carbon For Carbon Credit Programs, Vineet Yadav, George Malanson, Elias Bekele, Christopher Lant
George P Malanson
Impending risks associated with climate change have forced the global community to devise tradable pollution permit or "cap and trade" approaches to control the release of greenhouse gases. In the U.S, soils have the potential to offset about 10 percent of annual CO sub(2) emissions; however, if carbon credits are to be included in greenhouse gas control programs, soil organic carbon (SOC) sequestration rates associated with agricultural land uses must be computed at a watershed scale. The Soil Water Assessment Tool (SWAT) water quality model, the Water Erosion Prediction Project (WEPP) erosion model, and the CENTURY 4.0 a soil carbon …
Riparian Landscapes, George Malanson
Modeling Impacts Of Erosion And Deposition On Soil Organic Carbon In The Big Creek Basin Of Southern Illinois, Vineet Yadav, George Malanson
Modeling Impacts Of Erosion And Deposition On Soil Organic Carbon In The Big Creek Basin Of Southern Illinois, Vineet Yadav, George Malanson
George P Malanson
No abstract provided.
Modeling Feedback Effects On Linear Patterns Of Subalpine Forest Advancement, M. Bekker, George Malanson
Modeling Feedback Effects On Linear Patterns Of Subalpine Forest Advancement, M. Bekker, George Malanson
George P Malanson
No abstract provided.
An Overview Of Scale, Pattern, Process Relationships In Geomorphology; A Remote Sensing And Gis Perspective, Stephen Walsh, David Butler, George Malanson
An Overview Of Scale, Pattern, Process Relationships In Geomorphology; A Remote Sensing And Gis Perspective, Stephen Walsh, David Butler, George Malanson
George P Malanson
Satellite remote sensing and geographic information systems are emerging technologies in geomorphology. They offer the opportunity to gain fresh insights into biophysical systems through the spatial, temporal, spectral, and radiometric resolutions of remote sensing systems and through the analytical and data integration capability of GIS. The two technologies can be linked together into a synergistic system that is particularly well suited to the examination of landscape conditions through the interrelationships of scale, pattern, and process, a paradigm that has gained prominence in the fields of biogeography and landscape ecology. In this study, we apply optical and microwave remote sensing systems …
Uncovering Spatial Feedbacks At Alpine Treeline Using Spatial Metrics In Evolutionary Simulations, George Malanson, Yu Zeng
Uncovering Spatial Feedbacks At Alpine Treeline Using Spatial Metrics In Evolutionary Simulations, George Malanson, Yu Zeng
George P Malanson
No abstract provided.
Landscape Fragmentation And Dispersal In A Model Of Riparian Forest Dynamics, Jeffrey Hanson, George Malanson, Marc Armstrong
Landscape Fragmentation And Dispersal In A Model Of Riparian Forest Dynamics, Jeffrey Hanson, George Malanson, Marc Armstrong
George P Malanson
No abstract provided.
Patterns Of Correlation Among Landscape Metrics, Qian Wang, George Malanson
Patterns Of Correlation Among Landscape Metrics, Qian Wang, George Malanson
George P Malanson
Representations of real and virtual landscapes are often abstracted and quantified as "landscape metrics" in landscape ecology, and while much is known about them after 20 years of use, some relations are as yet unexplored. The objective of this research is to gain a better understanding of the effects of spatial representation in landscape ecology. Nine hundred artificial landscapes were generated with varying spatial patterns created using a fractal landscape generator with 3D fractal dimensions ranging from 2.1 to 2.9 in increments of 0.1. The 3D landscapes were reduced to 2D patterns by putting the cells into five classes. Forty-four …
Not Seeing The Ocean For The Islands: The Mediating Influence Of Matrix-Based Processes On Forest Fragmentation Effects, John Kupfer, George Malanson, Scott Franklin
Not Seeing The Ocean For The Islands: The Mediating Influence Of Matrix-Based Processes On Forest Fragmentation Effects, John Kupfer, George Malanson, Scott Franklin
George P Malanson
The pervasive influence of island biogeography theory on forest fragmentation research has often led to a misleading conceptualization of landscapes as areas of forest/habitat and ‘non-forest/non-habitat’ and an overriding focus on processes within forest remnants at the expense of research in the human-modified matrix. The matrix, however, may be neither uniformly unsuitable as habitat nor serve as a fully–absorbing barrier to the dispersal of forest taxa. In this paper, we present a conceptual model that addresses how forest habitat loss and fragmentation affect biodiversity through reduction of the resource base, subdivision of populations, alterations of species interactions and disturbance regimes, …
Complexity Theory, Spatial Simulation Models, And Land Use Dynamics In The Northern Ecuadorian Amazon, Stephen Walsh, Joseph Messina, Carlos Mena, George Malanson
Complexity Theory, Spatial Simulation Models, And Land Use Dynamics In The Northern Ecuadorian Amazon, Stephen Walsh, Joseph Messina, Carlos Mena, George Malanson
George P Malanson
No abstract provided.
The Western Cordillera; The Physical Geography Of North America, George Malanson, David Butler
The Western Cordillera; The Physical Geography Of North America, George Malanson, David Butler
George P Malanson
No abstract provided.
Directional Positive Feedback And Pattern At An Alpine Tree Line, Kathryn Alftine, George Malanson
Directional Positive Feedback And Pattern At An Alpine Tree Line, Kathryn Alftine, George Malanson
George P Malanson
No abstract provided.
Simulated Village Locations In Thailand: A Multi-Scale Model Including A Neural Network Approach, Wenwu Tang, George Malanson, Barbara Entwisle
Simulated Village Locations In Thailand: A Multi-Scale Model Including A Neural Network Approach, Wenwu Tang, George Malanson, Barbara Entwisle
George P Malanson
The simulation of rural land use systems in general, and rural settlement dynamics in particular, has developed with synergies of theory and methods for decades. Three current issues are: linking spatial patterns and processes, representing hierarchical relations across scales, and considering nonlinearity to address complex non-stationary settlement dynamics. We present a hierarchical simulation model to investigate complex rural settlement dynamics in Nang Rong, Thailand. This simulation uses sub-models to allocate new villages at three spatial scales. Regional and sub-regional models, which involve a nonlinear space-time autoregressive model implemented in a neural network approach, determine the number of new villages to …
Endogenous Fractal Dynamics At Alpine Treeline Ecotones, Yu Zeng, George Malanson
Endogenous Fractal Dynamics At Alpine Treeline Ecotones, Yu Zeng, George Malanson
George P Malanson
Many of the hypotheses proposed to explain ecotones are based on an individualistic paradigm and are essentially static. While they include local feedbacks, they ignore the interactions between pattern and process across scales. These feedbacks in ecotones are nonlinear in nature and complicate the relations of pattern and process in vegetation, which, combined with observed fractal patterns, suggests a complexity science approach to investigate ecotone dynamics. A cellular automaton of alpine treeline, including nonlinear, local, positive, and negative feedbacks in tree establishment and mortality, as reported in field studies, is used as a model system. Fourier analysis of simulated alpine …
Periglacial Patterned Ground, Glacier National Park, Montana, David Butler, George Malanson, Rose Roberts, Kermit Rainman
Periglacial Patterned Ground, Glacier National Park, Montana, David Butler, George Malanson, Rose Roberts, Kermit Rainman
George P Malanson
No abstract provided.
Potential Catastrophic Flooding From Landslide-Dammed Lakes, Glacier National Park, Montana, Usa, David Butler, George Malanson, Jack Oelfke
Potential Catastrophic Flooding From Landslide-Dammed Lakes, Glacier National Park, Montana, Usa, David Butler, George Malanson, Jack Oelfke
George P Malanson
The Rocky Mountains have a high hazard potential from rapid slope failures, subsequent damming of drainage systems, and catastrophic rapid drainage of the landslide-dammed lake. Most landslide dams eventually fail by overtopping. This paper examines the history of, and the potential for catastrophic failure and high discharges from, a pair of landslide-dammed lakes in Glacier National Park, Montana, USA. Tree-ring and lichen data from the surface and margins of the rockfall-avalanche dams indicate contemporaneous deposition occurred in 1910, with additional deposition in 1946. The rockfall-avalanche dams overlie Cretaceous shale capped with late Pleistocene glacial till. The deposits are therefore inherently …
An Agent-Based Model Of Household Dynamics And Land Use Change, Barbara Entwisle, George Malanson, Ronald Rindfuss, Srephen Walsh
An Agent-Based Model Of Household Dynamics And Land Use Change, Barbara Entwisle, George Malanson, Ronald Rindfuss, Srephen Walsh
George P Malanson
No abstract provided.
Characteristics Of Two Landslide-Dammed Lakes In A Glaciated Alpine Environment, David Butler, George Malanson
Characteristics Of Two Landslide-Dammed Lakes In A Glaciated Alpine Environment, David Butler, George Malanson
George P Malanson
Two young landslide-dammed lakes in a remote portion of Glacier National Park, Montana were studied to determine if their characteristics are similar to those of older glacial lakes. We sampled lake depth along longitudinal transects and collected lake-bottom sediments for examination of particle size, organic matter content, and presence of benthic vegetation. Water-quality data were also analyzed. The older Slide Lake has a less steep bottom and supports benthic vegetation; the younger Slide Pond, with a steep bottom profile, does not. Organic matter content and sedimen textural characteristics were a function of location in each lake, particularly in terms of …
Post-Fire Regeneration Strategies Of Californian Coastal Sage Shrubs, George Malanson, John O'Leary
Post-Fire Regeneration Strategies Of Californian Coastal Sage Shrubs, George Malanson, John O'Leary
George P Malanson
Regeneration methods for coastal sage srub vegetation after fire were studied in the coastal Santa Monica Mountains of southern California. Six sites were sampled two years after a large fire of fall, 1978. The intensity of fire varied. Foliar cover and flowering incidence were recorded for individuals regenerating by resprouting or from seed. Resprouting plants contributed most to post-fire recovery, comprising 95% of the relative foliar shrub cover; 84% of resprout and 47% of seedling cover had flowered. An ANOVA of reproductive mode and fire intensity indicates that resprout total cover and individual size are significantly greater than those of …
The Rise And Fall Of The Uintah Valley Indian Reservation; Perception And Policy, George Malanson
The Rise And Fall Of The Uintah Valley Indian Reservation; Perception And Policy, George Malanson
George P Malanson
No abstract provided.
Complexity At Advancing Ecotones And Frontiers, George Malanson, Yu Zeng, Stephen Walsh
Complexity At Advancing Ecotones And Frontiers, George Malanson, Yu Zeng, Stephen Walsh
George P Malanson
Ecotones, such as advancing treelines, have been examined as complex self-organizing systems. Frontiers of human settlement may share some of their spatial characteristics, because they too include feedbacks between spatial pattern and process. Advancing frontiers of three study areas in the Amazonian region of Ecuador are analyzed with the aid of Landsat imagery to detect change. Power-law distributions of advancing deforestation are found, which are indicative of possible complexity. Alternative approaches in self-organized complexity, including self-organized percolation and the inverse-cascade model, and an approach to complexity involving optimization?highly optimized tolerance?are considered. Some combination of these, based on their common ancestry …
Observed And Modeled Directional Change In Riparian Forest Composition At A Cutbank Edge, John Kupfer, George Malanson
Observed And Modeled Directional Change In Riparian Forest Composition At A Cutbank Edge, John Kupfer, George Malanson
George P Malanson
Lateral migrations of river meanders create transient, spatially transgressive edges where the advancing cutbank edge encroaches upon interior floodplain forest communities. This spatial movement of edge toward the forest interior should initiate directional changes in species composition within a forest plot as it is affected by a changing microclimate and hydrological regime. We found that cutbank edge and forest interior sites in an Iowa floodplain contained markedly different plant assemblages. Species commonly associated with later stages of succession dominated interior sites while cutbank edge sites favored secondary, successional species. Assuming that the cutbank edge sites once contained vegetation similar to …
Considering Complexity, George Malanson
Progress In Soil Organic Matter Research, Vineet Yadav, George Malanson
Progress In Soil Organic Matter Research, Vineet Yadav, George Malanson
George P Malanson
Retention and sequestration of soil organic matter is extremely important for the maintenance of soil structure, agricultural productivity and carbon sequestration. Research in soil organic matter has advanced on many fronts in the last half century. During this time understanding of the factors governing plant litter decomposition has increased considerably resulting in the formulation of process and organism-based models. Remote sensing has been shown to be useful for quickly monitoring stocks of soil organic carbon in the topsoil although much remains to be done to establish its efficacy. Fluxes of soil organic matter in the changing climatic scenarios have been …
An Assessment Of Snow Avalanche Paths And Forest Dynamics Using Ikonos Satellite Data, S. Walsh, D. Weiss, D. Butler, George Malanson
An Assessment Of Snow Avalanche Paths And Forest Dynamics Using Ikonos Satellite Data, S. Walsh, D. Weiss, D. Butler, George Malanson
George P Malanson
No abstract provided.
Village Settlement, Deforestation, And The Expansion Of Agriculture In A Frontier Region: Nang Rong, Thailand, B. Entwisle, J. Edmeades, George Malanson
Village Settlement, Deforestation, And The Expansion Of Agriculture In A Frontier Region: Nang Rong, Thailand, B. Entwisle, J. Edmeades, George Malanson
George P Malanson
No abstract provided.
Habitats, Hierarchical Scales, And Nonlinearities: An Ecological Perspective On Linking Household And Remotely Sensed Data On Land-Use/Cover Change, George Malanson
Habitats, Hierarchical Scales, And Nonlinearities: An Ecological Perspective On Linking Household And Remotely Sensed Data On Land-Use/Cover Change, George Malanson
George P Malanson
No abstract provided.
Influences Of Geomorphology And Geology On Alpine Treeline In The American West; More Important Than Climatic Influences?, David Butler, George Malanson, Stephen Walsh, Daniel Fagre
Influences Of Geomorphology And Geology On Alpine Treeline In The American West; More Important Than Climatic Influences?, David Butler, George Malanson, Stephen Walsh, Daniel Fagre
George P Malanson
No abstract provided.
Lithologic, Structural, And Geomorphic Controls On Ribbon Forest Patterns In A Glaciated Mountain Environment, David Butler, George Malanson, Matthew Bekker, Lynn Resler
Lithologic, Structural, And Geomorphic Controls On Ribbon Forest Patterns In A Glaciated Mountain Environment, David Butler, George Malanson, Matthew Bekker, Lynn Resler
George P Malanson
So-called "ribbon forests" have been attributed to snowdrift patterns and fire history without reference to geomorphology [Vegetatio 19 (1969) 192]. This paper illustrates how site conditions of geomorphology and geology explain the origin of ribbon forests. In Glacier National Park, MT (USA), regional tectonic uplift associated with the Laramide Orogeny produced structural features that amplify lithologic differences. Pleistocene glaciation scoured deeply along the strike of bedding planes, highlighting this pattern and in some cases producing fine-scale parallel finger lakes between forested ribbon strips. Twelve ribbon forest sites on both sides of the Continental Divide were closely studied on stereoscopic aerial …
Soils And Pedogenesis At Alpine Tree Line, Ginger Schmid, David Butler, George Malanson, Lynn Resler
Soils And Pedogenesis At Alpine Tree Line, Ginger Schmid, David Butler, George Malanson, Lynn Resler
George P Malanson
No abstract provided.