Search results for: Thomas R. Crow

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Modeling the long-term effects of fire suppression on central hardwood forests in Missouri Ozarks, using LANDIS

ZongBo Shang, Hong S. He, David E. Lytle, Stephen R. Shifley, more

Forest Ecology and Management > 2007 > 242 > 2-3 > 776-790

Fire suppression has been found to dramatically change fire regimes, lead to accumulation of fuels, and alter forest composition and species abundance in the Central Hardwood Forests in the Missouri Ozarks, United States. After a half century of fire suppression, fire hazards have increased to a high level and high intensity fires are more likely to occur. We used LANDIS, a spatially explicit landscape...

article

Age-Dependent Changes in Ecosystem Carbon Fluxes in Managed Forests in Northern Wisconsin, USA

Asko Noormets, Jiquan Chen, Thomas R. Crow

Ecosystems > 2007 > 10 > 2 > 187-203

The age-dependent variability of ecosystem carbon (C) fluxes was assessed by measuring the net ecosystem exchange of C (NEE) in five managed forest stands in northern Wisconsin, USA. The study sites ranged in age from 3-year-old clearcut to mature stands (65 years). All stands, except the clearcut, accumulated C over the study period from May to October 2002. Seasonal NEE estimates were −655 ± 17...

article

Homogenization of northern U.S. Great Lakes forests due to land use

Lisa A. Schulte, David J. Mladenoff, Thomas R. Crow, Laura C. Merrick, more

Landscape Ecology > 2007 > 22 > 7 > 1105-1105

The online version of the original article can be found under doi: 10.1007/s10980-007-9095-5

article

Homogenization of northern U.S. Great Lakes forests due to land use

Lisa A. Schulte, David J. Mladenoff, Thomas R. Crow, Laura C. Merrick, more

Landscape Ecology > 2007 > 22 > 7 > 1089-1103

Human land use of forested regions has intensified worldwide in recent decades, threatening long-term sustainability. Primary effects include conversion of land cover or reversion to an earlier stage of successional development. Both types of change can have cascading effects through ecosystems; however, the long-term effects where forests are allowed to regrow are poorly understood. We quantify the...

article

Simulating the effects of prescribed burning on fuel loading and timber production (EcoFL) in managed northern Wisconsin forests

Soung-Ryoul Ryu, Jiquan Chen, Daolan Zheng, Mary K. Bresee, more

Ecological Modelling > 2006 > 196 > 3-4 > 395-406

We developed a fuel loading prediction model (EcoFL), which quantified fuel loads at ecosystem level using a classical ecosystem productivity concept and aboveground biomass measurements. EcoFL predicted fuel loading with high precision (r ² =0.94), but the linear relationship between measured and predicted was slightly off from the 1:1 line (slope=0.86–1.17). The study showed a possibility...

article

Visualizing forest landscapes using public data sources

Xianli Wang, Bo Song, Jiquan Chen, Daolan Zheng, more

Landscape and Urban Planning > 2006 > 75 > 1-2 > 111-124

Three-dimensional (3-D) visualizations of forest landscapes are quantitative ecological information-based techniques that can be used to visualize forest structure, dynamics, landscape transformations and regional plans. Visualizing forests and landscapes with limited ground observations are often the primary challenge for quality animations. Conducting stand-level field surveys over a large forest...

article

Simulating the Effects of Fire Reintroduction Versus Continued Fire Absence on Forest Composition and Landscape Structure in the Boundary Waters Canoe Area, Northern Minnesota, USA

Robert M. Scheller, David J. Mladenoff, Thomas R. Crow, Theodore A. Sickley

Ecosystems > 2005 > 8 > 4 > 396-411

The Boundary Waters Canoe Area (BWCA) Wilderness of northern Minnesota, USA, ememplifies how fire management and natural disturbance determine forest composition and landscape structure at a broad scale. Historically, the BWCA (>400,000 ha) was subject to crown fires with a mean rotation period of 50–100 y. Fires often overlapped, creating a mosaic of differently aged stands with many stands burning...

article

Simulating forest fuel and fire risk dynamics across landscapes—LANDIS fuel module design

Hong S. He, Bo Z. Shang, Thomas R. Crow, Eric J. Gustafson, more

Ecological Modelling > 2004 > 180 > 1 > 135-151

Understanding fuel dynamics over large spatial (10 ³ –10 ⁶ ha) and temporal scales (10 ¹ –10 ³ years) is important in comprehensive wildfire management. We present a modeling approach to simulate fuel and fire risk dynamics as well as impacts of alternative fuel treatments. The approach is implemented using the fuel module of an existing spatially explicit forest landscape...

article

Fuel load reductions and fire risk in central hardwood forests of the united states: a spatial simulation study

Bo Z. Shang, Hong S. He, Thomas R. Crow, Stephen R. Shifley

Ecological Modelling > 2004 > 180 > 1 > 89-102

With wildfire suppression, accumulation of fine fuels and coarse fuels increases fire risk in Central Hardwood Forests. Assessment of fire risk provides guides for fuel treatments (prescribed fires, or coarse woody debris reduction) to avoid severe wildfires. A spatially explicit landscape model, LANDIS, was used to simulate fine and coarse fuels and their dynamics in the Missouri Ozarks as influenced...

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Effects of harvesting and deer browsing on attributes of understory plants in northern hardwood forests, Upper Michigan, USA

Lidia Szabo Kraft, Thomas R. Crow, David S. Buckley, Elizabeth A. Nauertz, more

Forest Ecology and Management > 2004 > 199 > 2-3 > 219-230

Both forest harvesting and browsing by white-tailed deer (Odocoileus virginianus Zimmerman) affect the composition and structure of forest vegetation throughout the eastern deciduous forest in the United States. We studied their affect and their interaction by measuring the composition, richness, cover, physical stature, and reproductive potential of vascular plants in the understory of three thinned...

article

A hierarchical approach for simulating northern forest dynamics

Don C. Bragg, David W. Roberts, Thomas R. Crow

Ecological Modelling > 2004 > 173 > 1 > 31-94

Complexity in ecological systems has challenged forest simulation modelers for years, resulting in a number of approaches with varying degrees of success. Arguments in favor of hierarchical modeling are made, especially for considering a complex environmental issue like widespread eastern hemlock regeneration failure. We present the philosophy and basic framework for the NORTHern Woodland Dynamics...

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Characterizing historical and modern fire regimes in Michigan (USA): A landscape ecosystem approach

David T. Cleland, Thomas R. Crow, Sari C. Saunders, Donald I. Dickmann, more

Landscape Ecology > 2004 > 19 > 3 > 311-325

We studied the relationships of landscape ecosystems to historical and contemporary fire regimes across 4.3 million hectares in northern lower Michigan (USA). Changes in fire regimes were documented by comparing historical fire rotations in different landscape ecosystems to those occurring between 1985 and 2000. Previously published data and a synthesis of the literature were used to identify six...

article

Disturbance and landscape dynamics in the Chequamegon National Forest Wisconsin, USA, from 1972 to 2001

Mary K. Bresee, Jim Le Moine, Stephen Mather, Kimberley D. Brosofske, more

Landscape Ecology > 2004 > 19 > 3 > 291-309

Land uses, especially harvesting and road building, are considered to be the primary cause of forest fragmentation in many parts of the world. To test this perception, we (1) quantified changes and rates of change in vegetative composition and structure within the Washburn Ranger District in northern Wisconsin using Landsat images, (2) examined changes in landscape structure, (3) assessed changes...

article

Emulating natural landscape disturbance in forest management – an introduction

Thomas R. Crow, Ajith H. Perera

Landscape Ecology > 2004 > 19 > 3 > 231-233

This revised version was published online in May 2005 with corrections to the Cover Date.

article

A Working Framework for Quantifying Carbon Sequestration in Disturbed Land Mosaics

Jiquan Chen, Kimberley D. Brosofske, Asko Noormets, Thomas R. Crow, more

Environmental Management > 2004 > 33 > S1 > S210-S221

We propose a working framework for future studies of net carbon exchange (NCE) in disturbed landscapes at broad spatial scales based on the central idea that landscape-level NCE is determined by the land mosaic, including its age structure. Within this framework, we argue that the area-of-edge-influence (AEI), which is prevalent in many disturbed, fragmented landscapes, should constitute a distinct...

article

Available Fuel Dynamics in Nine Contrasting Forest Ecosystems in North America

Soung-Ryoul Ryu, Jiquan Chen, Thomas R. Crow, Sari C. Saunders

Environmental Management > 2004 > 33 > S1 > S87-S107

Available fuel and its dynamics, both of which affect fire behavior in forest ecosystems, are direct products of ecosystem production, decomposition, and disturbances. Using published ecosystem models and equations, we developed a simulation model to evaluate the effects of dynamics of aboveground net primary production (ANPP), carbon allocation, residual slash, decomposition, and disturbances (harvesting,...

article

Influence of skid trails and haul roads on understory plant richness and composition in managed forest landscapes in Upper Michigan, USA

David S. Buckley, Thomas R. Crow, Elizabeth A. Nauertz, Kurt E. Schulz

Forest Ecology and Management > 2003 > 175 > 1-3 > 509-520

We evaluated impacts of disturbance in interior haul roads and skid trails on understory vegetation by documenting the areal extent of these features and plant composition along 10mx100m belt transects. Ten belt transects were sampled in each of three comparable northern hardwood forests under even-aged management. These forests were approximately 80 years old and were last entered for thinning 4-6...

article

Modeling landscape net ecosystem productivity (LandNEP) under alternative management regimes

Eugénie S. Euskirchen, Jiquan Chen, Harbin Li, Eric J. Gustafson, more

Ecological Modelling > 2002 > 154 > 1-2 > 75 - 91

Forests have been considered as a major carbon sink within the global carbon budget. However, a fragmented forest landscape varies significantly in its composition and age structure, and the amount of carbon sequestered at this level remains generally unknown to the scientific community. More precisely, the temporal dynamics and spatial distribution of net ecosystem productivity (NEP) in a mosaic...

article

The patch mosaic and ecological decomposition across spatial scales in a managed landscape of northern Wisconsin, USA

Sari C. Saunders, Jiquan Chen, Thomas D. Drummer, Thomas R. Crow, more

Basic and Applied Ecology > 2002 > 3 > 1 > 49-64

Understanding landscape organization across scales is vital for determining the impacts of management and retaining structurally and functionally diverse ecosystems. We studied the relationships of a functional variable, decomposition, to microclimatic, vegetative and structural features at multiple scales in two distinct landscapes of northern Wisconsin, USA. We hoped to elucidate any characteristic...

article

Using a GIS model to assess terrestrial salamander response to alternative forest management plans

Eric J. Gustafson, Nathan L. Murphy, Thomas R. Crow

Journal of Environmental Management > 2001 > 63 > 3 > 281-292

A GIS model predicting the spatial distribution of terrestrial salamander abundance based on topography and forest age was developed using parameters derived from the literature. The model was tested by sampling salamander abundance across the full range of site conditions used in the model. A regression of the predictions of our GIS model against these sample data showed that the model has a modest...

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Search results for: Thomas R. Crow

Modeling the long-term effects of fire suppression on central hardwood forests in Missouri Ozarks, using LANDIS

Age-Dependent Changes in Ecosystem Carbon Fluxes in Managed Forests in Northern Wisconsin, USA

Homogenization of northern U.S. Great Lakes forests due to land use

Homogenization of northern U.S. Great Lakes forests due to land use

Simulating the effects of prescribed burning on fuel loading and timber production (EcoFL) in managed northern Wisconsin forests

Visualizing forest landscapes using public data sources

Simulating the Effects of Fire Reintroduction Versus Continued Fire Absence on Forest Composition and Landscape Structure in the Boundary Waters Canoe Area, Northern Minnesota, USA

Simulating forest fuel and fire risk dynamics across landscapes—LANDIS fuel module design

Fuel load reductions and fire risk in central hardwood forests of the united states: a spatial simulation study

Effects of harvesting and deer browsing on attributes of understory plants in northern hardwood forests, Upper Michigan, USA

A hierarchical approach for simulating northern forest dynamics

Characterizing historical and modern fire regimes in Michigan (USA): A landscape ecosystem approach

Disturbance and landscape dynamics in the Chequamegon National Forest Wisconsin, USA, from 1972 to 2001

Emulating natural landscape disturbance in forest management – an introduction

A Working Framework for Quantifying Carbon Sequestration in Disturbed Land Mosaics

Available Fuel Dynamics in Nine Contrasting Forest Ecosystems in North America

Influence of skid trails and haul roads on understory plant richness and composition in managed forest landscapes in Upper Michigan, USA

Modeling landscape net ecosystem productivity (LandNEP) under alternative management regimes

The patch mosaic and ecological decomposition across spatial scales in a managed landscape of northern Wisconsin, USA

Using a GIS model to assess terrestrial salamander response to alternative forest management plans

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