Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Watershed Scale Vegetation Patterns In A Late Successional Forest Landscape In The Oregon Coast Range
Download Watershed Scale Vegetation Patterns In A Late Successional Forest Landscape In The Oregon Coast Range full books in PDF, epub, and Kindle. Read online Watershed Scale Vegetation Patterns In A Late Successional Forest Landscape In The Oregon Coast Range ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Watershed-scale Vegetation Patterns in a Late-successional Forest Landscape in the Oregon Coast Range by : Michael C. Wimberly
Download or read book Watershed-scale Vegetation Patterns in a Late-successional Forest Landscape in the Oregon Coast Range written by Michael C. Wimberly and published by . This book was released on 1999 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowledge about vegetation patterns and ecological processes in unmanaged, late-successional watersheds is needed to provide a foundation for forest management strategies aimed at conserving native biodiversity. I examined influences of environmental variability and disturbance history on forest structure and composition in the Cummins Creek Wilderness, located on the central Oregon coast. Climatic and topographic variables explained the majority of hillslope community composition, while fire history explained most of the variability in hillslope forest structure. Forest structure and composition in riparian areas was related to a climatic gradient as well as position in the stream network. The abundance of two fire-sensitive species, Tsuga heterophylla (western hemlock) and Picea sitchensis (Sitka spruce), decreased with distance from old-growth patches, possibly reflecting a seed dispersal gradient that occurred following fires 80 to 140 years ago. I developed predictive maps of understory conifer patterns using remote sensing, aerial photographs, digital elevation models and stream maps. I predicted P. sitchensis regeneration based on distance from the coast and topography, and T. heterophylla regeneration based on crown size, percent hardwood composition, topography, and distance from old-growth patches. Although I found statistically significant relationships between understory patterns and GIS predictor variables, the models explained only low to moderate amounts of the overall variability. Landscape-scale simulations of T. heterophylla showed that population expansion through gap-phase recruitment was limited by short seed dispersal distances in closed-canopy forests, the requirement for canopy gap disturbances to facilitate overstory recruitment, and the lag between recruitment and reproduction. Although fine-scale habitat features can influence the amount of regeneration in a gap when seed sources are present, the fire regime may ultimately control the abundance of T. heterophylla at the landscape scale through dispersal limitations. Brief increases in fire frequency can cause a sustained decrease in the amount of T. heterophylla on the landscape once fire frequency is reduced below a threshold value. Our results emphasize the complexity and diversity of forest vegetation at the watershed scale. Environmental variability, disturbance history, and dispersal limitations have all played a role in creating the current landscape patterns in the Cummins Creek Wilderness.
Book Synopsis Characteristics of Remnant Old Growth Forests in the Northern Coast Range of Oregon and Comparison to Surrounding Landscapes by : Andrew N. Gray
Download or read book Characteristics of Remnant Old Growth Forests in the Northern Coast Range of Oregon and Comparison to Surrounding Landscapes written by Andrew N. Gray and published by DIANE Publishing. This book was released on 2011-05 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Old-growth forests provide unique habitat features and landscape functions compared to younger stands. The goals of many forest mgmt. plans in the Pacific NW include increasing the area of late-successional and old-growth forests. This study describes existing old-growth forests in the northern Oregon Coast Range that might serve as examples of desired future conditions and developmental pathways. Results suggest that although old-growth forests can develop along multiple pathways, stand composition and productivity constrain development such that expecting all late-successional stands to have the full complement of old-growth attributes may not be realistic. Illustrations. This is a print on demand report.
Book Synopsis Forest and Stream Management in the Oregon Coast Range by : Stephen D. Hobbs
Download or read book Forest and Stream Management in the Oregon Coast Range written by Stephen D. Hobbs and published by . This book was released on 2002 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This major volume presents a wealth of fundamental and applied research on managing Coast Range forest and stream ecosystems. Written primarily for managers and resource specialists, the book will also appeal to policymakers, resource scientists, forest landowners, the conservation community, and students interested in forestry, fisheries, and wildlife sciences.
Book Synopsis Ecosystem Management by : B. Narayan
Download or read book Ecosystem Management written by B. Narayan and published by APH Publishing. This book was released on 2000 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecological Characteristics of Forested Watersheds Along the Central Oregon Coast by : Matthew Sidney Kimble
Download or read book Ecological Characteristics of Forested Watersheds Along the Central Oregon Coast written by Matthew Sidney Kimble and published by . This book was released on 1995 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Land-water Interface by : Mayumi Takahashi
Download or read book The Land-water Interface written by Mayumi Takahashi and published by . This book was released on 2003 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted to describe variation of riparian vegetation in an Oregon Coast Range system according to geomorphic characteristics and in relation to streamflow. Specific objectives of this study were to: I) examine if the vegetation composition and structure of the riparian forest varied among channel-reach morphologies, 2) examine how the composition and structure of the riparian forest changed with distance from the stream, and 3) extract major underlying environmental gradients explaining riparian forest community from riparian vegetation data. A 30 m x 30 m sample site was randomly located on each side of upper Camp Creek in each of 19 reaches, and within each site three consecutive 30 m x 10 m belt-transects established perpendicular to the stream flow. Overstory and understory vegetation was sampled in each belt transect. Environmental variables sampled included slope, aspect, height above summer low flow, elevation above sea level. Non-metric Multidimensional Scaling and Indicator Species Analysis was used to describe characteristics of riparian plant communities. Distinct riparian vegetation patterns were observed in upper Camp Creek with increasing distance from stream. Both overstory and understory vegetation quickly changed with increasing distance from stream. Areas within ten meters from stream were characterized as mesic riparian environments while areas twenty meters away from stream were characterized as upland conifer forest environments. Vegetation composition was ordered along an inferred moisture gradient from streamside to hillslope, and distance from stream and height above summer low flow were almost equally correlated to the gradient. Tall shrubs including salmonberry, sword fern and vine maple are important component of riparian vegetation. Channel-reach morphology little differentiated riparian vegetation. A few species were significantly abundant in a specific reach of channel morphology. However, results of this study about relationships between channel-reach morphology and riparian vegetation were inconclusive.
Book Synopsis Characteristics of Remnant Old-Growth Forests in the Northern Coast Range of Oregon and Comparison to Surrounding Landscapes by : United States Department of Agriculture
Download or read book Characteristics of Remnant Old-Growth Forests in the Northern Coast Range of Oregon and Comparison to Surrounding Landscapes written by United States Department of Agriculture and published by CreateSpace. This book was released on 2015-02-14 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Old-growth forests provide unique habitat features and landscape functions compared to younger stands. The goals of many forest management plans in the Pacific Northwest include increasing the area of late-successional and old-growth forests. The goal of this study was to describe existing old-growth forests in the northern Oregon Coast Range that might serve as examples of desired future conditions and developmental pathways. In addition, the abundance of specific stand attributes associated with old-growth stands was estimated from regional inventory data. Most of the old-growth stands had experienced moderately severe disturbances during their development resulting in mid- and understory trees belonging to cohorts younger than those of overstory trees. Most of the stands had the full complement of old-growth attributes (large shade-intolerant trees, shadetolerant trees, snags, and down wood), although the dead wood attributes tended to be less abundant in drier stand types. Thresholds for at least four of the five old-growth attributes were met on 7 percent of the inventory plots on federal lands, but on only 0.4 percent of the inventory plots on nonfederal lands. Shade-intolerant trees in particular were low in abundance in mature stands of intermediate diameter class (10 to 30 in). Large-diameter class stands (>30 in) were more abundant near the coast than near the Willamette Valley margin. Results suggest that although old-growth forests can develop along multiple pathways, stand composition and productivity constrain development such that expecting all late-successional stands to have the full complement of old-growth attributes may not be realistic.
Book Synopsis Policy Patterns Across Riverscapes by : Brett A. Boisjolie
Download or read book Policy Patterns Across Riverscapes written by Brett A. Boisjolie and published by . This book was released on 2016 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Land management policies are ideas about nature projected onto the landscape. Culminations of social, economic, and scientific influences, these policies create standards affecting the function of ecological systems. In the case of riparian lands in the Oregon Coast Range, policy requirements vary considerably across federal, state, and private land ownerships. Protective measures, such as the adoption of fixed buffer widths for maintaining vegetation, are intended to preserve natural processes important to instream habitat and water quality. However, the "policy landscape" of variable management standards can result in a fragmented approach to policy protection. This fragmentation complicates recovery efforts for threatened anadromous fish species such as coho salmon (Oncorhynchus kisutch), which require connectivity in suitable habitat segments throughout the river network. Taking a riverscape perspective, this study evaluates how aquatic protections vary across the river and its valley. To explore the patterns created from variable standard, the study first delineates categories of riparian management standards in the Oregon Coast Range. Using a geographic information system (GIS), these standards are mapped across the river networks of this region. The extent of each policy category is quantified in stream kilometers in order to evaluate policy efforts within and across the riverscapes of the Oregon Coast Range. A model of intrinsic potential for coho salmon habitat is used to identify the policy standards in stream reaches where flow, valley constraint, and channel gradient are appropriate for coho salmon habitat. A second model of the stream network (hydrography) is developed to evaluate how differences in stream delineation can influence policy patterns. Results indicate that riparian lands of the Oregon Coast Range are protected by variable standards for land management, including buffer widths that range from 0 to ~152m. In streams important to coho salmon, a lower proportion of the stream network was found to be protected by policy standards compared to the watershed and ESU scale. A lack of stream data central to policy application (fish use, stream flow duration, mean annual flow, water use) complicated our ability to attribute stream segments with specific land management requirements. The choice of hydrographic data was also found to influence the proportional extent of policies within riverscapes. This framework for assessing the spatial distribution of policies can provide insights for future studies of riverscape systems.
Book Synopsis Patterns of Grassland, Shrubland, and Woodland Vegetation Abundance in Relation to Landscape-scale Environmental and Disturbance Variables, Applegate Watershed Southwest, Oregon by : Eric Pfaff
Download or read book Patterns of Grassland, Shrubland, and Woodland Vegetation Abundance in Relation to Landscape-scale Environmental and Disturbance Variables, Applegate Watershed Southwest, Oregon written by Eric Pfaff and published by . This book was released on 2007 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Northwest Forest Plan Research Synthesis by :
Download or read book Northwest Forest Plan Research Synthesis written by and published by . This book was released on 2001 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis General Technical Report PNW-GTR by :
Download or read book General Technical Report PNW-GTR written by and published by . This book was released on 2001 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Disturbance and Landscape History as a Reference for Evaluating Forest Management Effects at a Regional Scale by : Etsuko Nonaka
Download or read book Disturbance and Landscape History as a Reference for Evaluating Forest Management Effects at a Regional Scale written by Etsuko Nonaka and published by . This book was released on 2003 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: History is an invaluable source of information to understand and evaluate management influences on contemporary ecosystems and landscapes. The first two chapters (Chapters 2 and 3) explored the concept of historical range of variability (HRV) in landscape structure and stand structure using a stochastic fire simulation model to simulate presettlement (before 1850) landscapes of the Oregon Coast Range. HRV has been defined as the bounded variability of a system within constraints imposed by larger-scale phenomena (e.g. climate, topography) and without significant modern human influence. HRV of landscapes has been proposed as a guide for biodiversity conservation in the past decade. In Chapter 2, I estimated HRV of a regional landscape and evaluated the similarity of current and alternative future landscapes under two land management scenarios to the conditions within the HRV. The simulation results indicated that historical landscapes of the region were dynamic, composed of patches of various sizes and age classes ranging from 0 to> 800 years as well as numerous small unburned island patches. The current landscape was outside the HRV. The landscape did not return to the HRV in 100 years under either scenario largely because of lack of old-growth forests and overabundance of young forests. This study showed that the HRV can provide a reference condition for concrete, quantitative evaluations of landscape conditions and alternative management scenarios if sufficient data exist for estimating HRV. Departure from HRV can serve as an indicator of landscape conditions, but results depend on scale and quantification of landscape heterogeneity. In Chapter 3, I investigated the HRV in live and dead biomass and examined variability in disturbance history and forest stand development. I calculated biomass as a function of disturbance history. The HRV of live and dead wood biomass distributions revealed that the majority of the landscape historically contained> 500 Mg/ha of live wood and 50-200 Mg/ha of dead wood. The current dead wood condition is outside HRV. There was a wide variation in dead wood biomass because of variations in disturbance history. This study suggests that natural disturbance regimes and stand development are characterized by much larger variation than is typically portrayed or appreciated. The HRV approaches to evaluating landscape conditions need to include both landscape and stand characteristics to better represent ecological differences between managed and unmanaged landscapes. In Chapter 4, I used remotely sensed data and historical vegetation data in a GIS to examine changes occurred in vegetation cover since settlement in two major valleys, the Coquille and Tillamook, in the region. I used existing historical vegetation maps of the two valleys and collected historical vegetation data from the General Land Office (GLO) survey records. I characterized current vegetation conditions using an unsupervised classification of satellite images. Historically, the Coquille Valley was dominated by hardwood trees and the Tillamook was by conifers. Valley bottoms in both areas differed in vegetation from nearby uplands. Tree-covered areas have declined substantially in both valleys as a result of agriculture and development. The historical data offered reference conditions for assessment of changes in biodiversity that have occurred in these unique habitats. This thesis illustrates the benefit of using historical landscape information for better understanding of human influence on the landscape. Historical data often have many assumptions and limitations, but ecological impacts of landscape changes on native biota can be better understood by comparisons with historical conditions.
Book Synopsis Rogue River National Forest (N.F.), Ashland Watershed Protection Project by :
Download or read book Rogue River National Forest (N.F.), Ashland Watershed Protection Project written by and published by . This book was released on 2001 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oregon Coast Range Province Effectiveness Monitoring Pilot Study by :
Download or read book Oregon Coast Range Province Effectiveness Monitoring Pilot Study written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Late-successional Reserve Assessment for Oregon's North Coast Range Adaptive Management Area by :
Download or read book Late-successional Reserve Assessment for Oregon's North Coast Range Adaptive Management Area written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Findings written by and published by . This book was released on 1999 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
