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Author: Donald McKenzie Publisher: Forgotten Books ISBN: 9781528422307 Category : Languages : en Pages : 50
Book Description
Excerpt from Predicting the Effect of Fire on Large-Scale Vegetation Patterns in North America Ecological considerations provide constraints on the vegetation transitions produced by these reductions of lai, and additional insight into successional dynamics and changes in species composition. For example, fire can cause changes in the domi nant plant phenology or leaf type in a biome without obligatory changes in lal. Under standing how ecological effects preset the initial conditions to which fire behavior models are applied will be a key step in integrating biotic and abiotic processes, to effectively model the mechanisms of change at the biome scale. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Donald McKenzie Publisher: Forgotten Books ISBN: 9781528422307 Category : Languages : en Pages : 50
Book Description
Excerpt from Predicting the Effect of Fire on Large-Scale Vegetation Patterns in North America Ecological considerations provide constraints on the vegetation transitions produced by these reductions of lai, and additional insight into successional dynamics and changes in species composition. For example, fire can cause changes in the domi nant plant phenology or leaf type in a biome without obligatory changes in lal. Under standing how ecological effects preset the initial conditions to which fire behavior models are applied will be a key step in integrating biotic and abiotic processes, to effectively model the mechanisms of change at the biome scale. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: James Kerr Brown Publisher: Forgotten Books ISBN: 9780331411591 Category : Languages : en Pages : 20
Book Description
Excerpt from Surface Fuel Loadings and Predicted Fire Behavior for Vegetation Types in the Northern Rocky Mountains Many stands, identified by overstory cover type, were selected from large areas for fuel sampling. Selected stands were identified on aerial photographs and then located in the field. Stands were also selected while hiking on and off trails. Stand selection was not entirely random; however, effort was made to systematically and objectively distribute stands throughout entire drainages. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Thomas N. Sherratt Publisher: OUP Oxford ISBN: 0191563455 Category : Social Science Languages : en Pages : 313
Book Description
Why do we age? Why cooperate? Why do so many species engage in sex? Why do the tropics have so many species? When did humans start to affect world climate? This book provides an introduction to a range of fundamental questions that have taxed evolutionary biologists and ecologists for decades. Some of the phenomena discussed are, on first reflection, simply puzzling to understand from an evolutionary perspective, whilst others have direct implications for the future of the planet. All of the questions posed have at least a partial solution, all have seen exciting breakthroughs in recent years, yet many of the explanations continue to be hotly debated. Big Questions in Ecology and Evolution is a curiosity-driven book, written in an accessible way so as to appeal to a broad audience. It is very deliberately not a formal text book, but something designed to transmit the excitement and breadth of the field by discussing a number of major questions in ecology and evolution and how they have been answered. This is a book aimed at informing and inspiring anybody with an interest in ecology and evolution. It reveals to the reader the immense scope of the field, its fundamental importance, and the exciting breakthroughs that have been made in recent years.
Author: Brendan Morris Rogers Publisher: ISBN: 9781303810312 Category : Languages : en Pages : 202
Book Description
Large areas of boreal forest in North America and Eurasia are frequently disturbed by wildfire. These fires alter ecosystem structure and function and affect climate through various biophysical and biogeochemical pathways. Fire-related forcings, however, are highly uncertain, can be opposite in sign, and depend on fire behavior as mediated by meteorology and intrinsic ecosystem properties. Our current understanding of large-scale fire dynamics is inadequate for fully characterizing their role in the climate system. This is particularly pertinent given the sensitivity of high latitudes and the large projected increases in fire frequencies during the 21st century. My dissertation aims to better characterize the controls on and feedbacks from boreal fires so that we may properly account for them in global change projections and potentially mitigate the impacts. I first quantified landscape-scale fire carbon emissions from a 2010 burn in Alaska using field measurements and fine-scale (30 m) remote sensing imagery. Accurate maps of fire emissions are needed to validate larger-scale models and quantify regional carbon fluxes, but are currently lacking due to spatial scaling issues. Here I show that by accounting for plot-level heterogeneity and species effects on spectral signatures, emission models can be generated from non-linear correlations between the differenced Normalized Burn Ratio (dNBR) and field data. Belowground combustion was quantified from soil cores and scaled to the site-level using spruce adventitious root heights. Species-specific allometric equations and visual estimates were used to characterize aboveground carbon losses. Results indicated that fire-wide combustion (1.98 ± 0.19 kg C m−2) was substantially lower than that in the core burning area (2.67 ± 0.24 kg C m−2) and sites (2.88 ± 0.23 kg C m−2) because of lower-severity patches and unburned islands. These areas constitute a significant fraction of burn perimeters in Alaska but are generally not accounted for in regional-scale estimates. This approach may be suitable for other fires in the region. In addition to the positive forcing from carbon emissions, forest fires in boreal North America exert a cooling effect due to relatively large increases in spring albedo from canopy destruction and tree fall. Although this forcing has been characterized at local and regional scales, its climate impacts have not been assessed. I simulated the continental-scale climate footprint of this cooling under various burning scenarios. Forest composition was characterized using a stochastic model of fire occurrence, historical fire data from national inventories, and succession trajectories derived from moderate-scale remote sensing (500 m). When coupled to an Earth system model, younger vegetation from increased burning cooled the high-latitude atmosphere, primarily in the winter and spring, with noticeable feedbacks from the ocean and sea ice. Results from multiple scenarios suggested that a doubling of burn area could cool the surface by 0.23 ±0.09°C across boreal North America during winter and spring months (December through May). This has the potential to provide a negative feedback to winter warming across the domain on the order of 3 - 5% for a doubling, and 14 - 23% for a quadrupling, of burn area. Maximum cooling occurred in the areas of greatest burning and between February and April, reaching feedback potentials of up to 60%. Fire dynamics have been studied much less extensively in boreal Eurasia despite the region containing roughly 2/3rds of the world's boreal forests and displaying unique patterns of fire behavior. I used over a decade of satellite imagery to characterize variations in circumpolar fire behavior, immediate impacts, and longer-term responses. Compared to boreal North America, Eurasian fires were 58 ± 31% less likely to be crown fires, combusted 36 ± 5% less live vegetation, and caused 42 ± 5% less tree mortality. Eurasian fires also generated a 69 ± 9% smaller surface shortwave forcing during the initial post-fire decade, suggesting a near-neutral net climate forcing. Current global fire models were unable to capture the continental differences. I demonstrate that fire weather cannot explain the divergent fire dynamics and climate feedbacks. The primary drivers are shown to be species-level adaptations to fire, making this a preeminent example of species effects on continental-scale carbon and energy exchange.
Author: C. Justice Publisher: ISBN: 9783941300781 Category : Climatic changes Languages : en Pages : 400
Book Description
"The White Paper "Vegetation Fires and Global Change" is a global state-of-the-art analysis of the role of vegetation fires in the Earth System and is published as a collective endeavor of the world\2019s most renowned scientists and research groups working in fire science, ecology, atmospheric chemistry, remote sensing and climate change modeling. The aim of the White Paper is to support the endeavour of the United Nations and its affiliated processes and networks, notably the United Nations International Strategy for Disaster Reduction (UNISDR), the Hyogo Framework for Action 2005-2015 "Building the Resilience of Nations and Communities to Disasters" and the Global Wildland Fire Network, to address global vegetation fires for the benefit of the global environment and humanity. The White Paper provides insight into the complexity of global vegetation fire issues and rationale for coordinated, international action in crossboundary fire management at global scale."--Back cover.
Author: Donald McKenzie
Author: Donald McKenzie
Author: 
Author: United States. Forest Service
Author: Donald McKenzie
Author: Donald McKenzie
Author: James Kerr Brown
Author: Thomas N. Sherratt
Author: Brendan Morris Rogers
Author: C. Justice
Author: Michael G. Barbour