Download or read book Influence of the Mountain Pine Beetle Disturbance on Large Wood Dynamics and Channel Morphology in Mountain Streams written by Bryce Kendrick Marston and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Disturbance regimes are important determinants of both terrestrial and aquatic ecosystem structure and function. Disturbances may linger in the landscape and lag temporally, influencing stream ecosystem form and function for decades, if not centuries. The recent enhanced Mountain Pine Beetle (MPB) infestation in pine forests of the Rocky Mountain region has resulted in extensive tree mortality, producing the potential for significant increases in carbon supply to stream channels. To better understand MPB impacts on in-stream large wood (LW), a census was conducted in 30 headwater streams within the Medicine Bow National Forest in south-central Wyoming, across the temporal spectrum from early- to late-stage MPB-infestation. A subset of those streams exhibiting mean conditions at each level of infestation was surveyed to determine any significant differences in channel morphology or aquatic ecosystem function. Results indicate that wood loads related to the MPB-infestation significantly increase with time since initial infestation. However, even in late-stage infestation streams, many of the fallen MPB-killed trees are bridging across the channels and have yet to break and ramp down sufficiently enough to enter between the channel margins. Wood loads will continue to increase as more trees fall and bridging pieces decompose, break and then enter the channel. Measurable increases in the amount of LW with time since initial beetle infestation have both positive and negative effects on channel form and function. Although forest MPB-infestation has peaked in the study area, streams are still early on a curve of rapidly increasing wood loads that are beginning to affect streams and have the potential to dramatically increase the carbon base of regional stream ecosystems.
Download or read book Influence of Large Wood on Channel Morphology and Sediment Storage in Two Headwater Mountain Streams Fraser Experimental Forest Colorado written by Erica Lyn Bishop and published by . This book was released on 2011 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite ongoing research on many aspects of stream morphology and large wood effects on mountain stream channels, there have been no studies that quantify these variables in non-fish-bearing, extreme headwater streams. A recent outbreak of Mountain Pine Beetle (Dendroctonus ponderosae) has led to increased Lodgepole pine (Pinus contorta) mortality in the Western North America This outbreak is expected to increase input of large wood to streams in the next decade. Increased understanding of large wood and sediment interactions in small mountain streams could have broad implications in river restoration and habitat research. This study explores an area of less intensive mountain stream research by quantifying hydrologic and morphologic characteristics and large wood channel interactions in two low-order streams (Deadhorse and Lexen creeks) on the Fraser Experimental Forest, Colorado. The influence that large wood has on the study streams was observed during field investigations of hundreds of log steps, and large wood pieces forming bed, banks, and also acting as an erosional agent in the streams. In contrast to studies of larger systems, the lack of patterns and expected relationships between large wood, channel morphology and sediment storage and transport among the study streams illustrate the extent to which they may be highly influenced by local conditions, including widely variable large wood volumes and channel and valley characteristics, such as slope and valley width, between the reaches. The findings of this research show that results of prior studies in mountain streams and their subsequent generalizations regarding expected channel dynamics, large wood, and sediment characteristics may not be applicable to streams of this size and flow regime.
Download or read book Interaction Between Mountain Pine Beetle and Dynamics of Lodgepole Pine Stands written by Walter E. Cole and published by . This book was released on 1973 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Historic Influence of the Mountain Pine Beetle on Stand Dynamics in Canada s Rocky Mountain Parks written by Pamela Dykstra and published by . This book was released on 2006 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Canadian government announced the Mountain Pine Beetle Initiative (MPBI) in 2002 to address the socio-economic and ecological consequences of an epidemic of mountain pine beetle (Dendroctonus ponderosae Hopkins). The objective of this study was to establish baseline information on the ecological characteristics that occur at different stages of succession, resulting from mountain pine beetle disturbance at different time intervals. Key issues addressed by this study were: the post-beetle ecological character of stands; the ecological legacies that should be sought post-beetle; maintenance of ecological integrity in beetle-damaged landscapes; and the impacts of beetles on regeneration. This paper presents a study of stand conditions following two historic mountain pine beetle outbreaks events in the 1940s and 1980s. The study quantified structural and species composition of stands at different stages of succession (25 years and 65 years), and quantified the differences that occur in forest development between stands with and without disturbance by the beetle. It concludes with several recommendations for management of post-disturbance landscapes.
Download or read book Mountain Pine Beetle Dynamics in Lodgepole Pine Forests written by Walter E. Cole and published by . This book was released on 1980 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mountain Pine Beetle Dynamics in Lodgepole Pine Forests written by Walter E. Cole and published by . This book was released on 1980 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mountain Pine Beetle Dynamics in Lodgepole Pine Forests written by Gene D. Amman and published by . This book was released on 1983 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mountain Pine Beetle in Ponderosa Pine written by Gene D. Amman and published by . This book was released on 1986 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Localized Spatial and Temporal Attack Dynamics of the Mountain Pine Beetle in Lodgepole Pine written by Barbara J. Bentz and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Mechanical and Durability Properties of Mountain Pine Beetle Infested Timber written by John F. Kadla and published by . This book was released on 2008 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: To mitigate the impact of the mountain pine beetle epidemic on the British Columbia forest products sector, an understanding of the relationship between wood quality and time since infestation is needed. The proposed research project deals with the chemical and mechanical properties of mountain pine beetle-infested wood at various stages of attack. Using dynamic mechanical (DMA), and morphological (X-ray) analyses, the effect of mountain pine beetle on various wood components was determined and related to chemical composition. This report looks into the impact of the mountain pine beetle on the British Columbia forests and the outcomes of the analyses used.--Includes text from document.
Download or read book Effects of Thinning on Temperature Dynamics and Mountain Pine Beetle Activity in a Lodgepole Pine Stand written by Dale L. Bartos and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Synthesis of the Hydrological Consequences of Large scale Mountain Pine Beetle Disturbance written by Markus Schnorbus and published by . This book was released on 2011 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current synthesis is a review of research examining the effects of large-scale mountain pine beetle (MPB)-related disturbance conducted predominantly over the past five years. The emphasis is on research that explicitly examines the impact of beetle kill (or biotic disturbance in general) and the cumulative effects of large scale salvage harvesting operations in response to beetle kill. In general, forest disturbance has been found to increase snow accumulation and melt, reduce interception loss and evaporation, and increase runoff and stream flow.--Document.
Download or read book Potential Influences of Horizontal and Vertical Air Movement in Ponderosa Pine Stands on Mountain Pine Beetle Dispersal written by J. M. Schmid and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mountain Pine Beetle Impacts on Channel Morphology and Woody Debris in Forested Landscapes written by Marwan Hassan and published by . This book was released on 2008 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is part of a series of research papers that explore the biological, social, and economic aspects of British Columbia's mountain pine beetle (MPB) epidemic. The objective of this report was to determine watershed-scale impacts of mountain pine beetles by comparing channel conditions and the woody debris budget in watersheds infested by the MPB with those from similar old-growth forests with pre-infestation channel and riparian data. The use of a woody debris budget directly links large-scale lodgepole pine mortality to stream challen and piparian processes and conditions at the landscape level. Eighteen watersheds in the Sub-Boreal Spruce and Sub-Boreal--Pine Spruce biogeoclimatic zones were considered. The results are used to generate regionally and locally relevant best management practices that will guide operational planning in landscapes impacted by the MPB.--Includes text from Government of Canada publications site and from document.
Download or read book Mountain Pine Beetle Attack in Ponderosa Pine Comparing Methods for Rating Susceptibility written by David C. Chojnacky and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two empirical methods for rating susceptibility of mountain pine beetle attack in ponderosa pine were evaluated. The methods were compared to stand data modeled to objectively rate each sampled stand for susceptibly to bark-beetle attack. Data on bark-beetle attacks, from a survey of 45 sites throughout the Colorado Plateau, were modeled using logistic regression to estimate the probability of attack on individual trees from tree and stand variables. The logistic model allowed flexibility to easily scale results up to a stand level for comparison to the empirical methods. The empirical method, developed by Munson and Anhold, most closely correlated to the logistic regression results. However, the Munson/Anhold method rated all 45 study sites as either moderately or highly susceptible to bark-beetle attack, which raises concern about its lack of sensitivity. Future work on evaluating risk of bark-beetle impact should consider more than stand characteristics.
Download or read book Mountain Pine Beetle Emergence from Infested Logs During Hauling written by and published by . This book was released on 1993 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Northern Range Limit Mountain Pine Beetle Dendroctonus Ponderosae Outbreak Dynamics and Climate Interactions in Mixed Sub boreal Pine Forests of British Columbia written by Kathryn H. Hrinkevich and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Insect outbreaks are some of the most destructive processes of forest change with long-term economic and ecological effects that can be severe. For native insects that have co-evolved with their host forests it is important to develop and implement management strategies that are consistent with the basic ecology of the ecosystem being affected. This requires a sound ecological understanding of the disturbance regime and its function, which can only be gained through long-term stand histories appropriate to the scale of the process. This is becoming increasingly important in light of changing climate conditions which have already influenced disturbance regimes and the spatial distribution of insect ranges with unknown consequences. The objectives of this study were to develop a long-term record of mountain pine beetle (MPB) outbreaks near the northern limit of the species' range and to examine the interacting factors driving that disturbance regime. Using a combination of dendrochronological methods to reconstruct stand and outbreak history together with long-term local and large-scale climate data, I developed an integrated model of outbreak dynamics for north-central BC where little is known about the role of MPB in forest stand dynamics or the influence of climate on outbreak development. Using a 200-year outbreak reconstruction I determined that host susceptibility and mortality patterns had distinctly different characteristics than those described further south. Climate was more important than forest structure in determining outbreak frequency and severity, and persistent warm temperature anomalies, including the large-scale climate patterns driving these trends, were the most important direct climate drivers of outbreak development. Over short time scales, host stress preceded outbreaks, but long-term periods of vigorous tree growth were also important for outbreaks to develop. Differences between this study and others suggest that outbreak risk management and predictive models must consider regional differences in forest structure, host-climate relationships and climatic pressure on beetle populations. Given that regional host susceptibility criteria are met, low-frequency climate patterns such as PDO and ENSO are probably the most important outbreak drivers across the province. Recent climate changes have already altered the historical regime, and ongoing warming will likely change many of the interactions described here."--Leaves ii-iii
