EFFECTS OF SELECTIVE LOGGING ON CARBON DYNAMICS PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download EFFECTS OF SELECTIVE LOGGING ON CARBON DYNAMICS PDF full book. Access full book title EFFECTS OF SELECTIVE LOGGING ON CARBON DYNAMICS by . Download full books in PDF and EPUB format.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Abstract : Tropical forests play an important role in the global carbon cycle, but are threatened by human activities, particularly selective logging, which is projected to increase in extent and intensity due to the demands of a rapidly growing human population. Yet, the impacts of selective harvest on carbon dynamics of residual forests is poorly understood. This dissertation examines the effects of selective harvest involving twice the standard logging intensity in Ghana (6.5 vs. 2 to 3 trees ha−1) on aboveground biomass (AGB) and soil respiration in pre- and post-logging forest stands of a moist semi-deciduous forest in Ghana. Using standardized protocols, data were collected in one-hectare plots to observe variation in AGB and soil respiration before and after selective harvest. Prior to logging, AGB was 318.6 Mg ha−1. However, one year after the removal of 121.6 m3 ha−1 of timber trees, AGB declined by 16.9%. Variation in AGB both before and after logging was better explained by species dominance and functional diversity than by species richness. In particular, the dominance of certain species influenced carbon storage before and after logging, due, in part, to environmental filtering of species based on plant functional types and/or life form. While C storage in trees was associated with LAI before logging, LAI was most important for liana C storage after logging. There were significant differences (P ≤ 0.05) in seasonal variation of soil respiration before and after logging, and between a 10- and 20-year post-logging stands with soil respiration higher in the wet season. Similarly, there were significant differences (P ≤ 0.05) in seasonal variation among components of soil respiration in the 10- and 20-year post-logging stands. Autotrophic soil respiration was 33% higher in the 20-year post-logging stand while heterotrophic soil respiration remained similar between the two stands. In general, soil moisture was the most important factor influencing soil respiration across the post-logging stands and for components of soil respiration, particularly root and mycorrhizal respiration. This information about patterns and underlying controls on soil respiration from different soil components should aid attempts to accurately model soil respiration over space and time.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Abstract : Tropical forests play an important role in the global carbon cycle, but are threatened by human activities, particularly selective logging, which is projected to increase in extent and intensity due to the demands of a rapidly growing human population. Yet, the impacts of selective harvest on carbon dynamics of residual forests is poorly understood. This dissertation examines the effects of selective harvest involving twice the standard logging intensity in Ghana (6.5 vs. 2 to 3 trees ha−1) on aboveground biomass (AGB) and soil respiration in pre- and post-logging forest stands of a moist semi-deciduous forest in Ghana. Using standardized protocols, data were collected in one-hectare plots to observe variation in AGB and soil respiration before and after selective harvest. Prior to logging, AGB was 318.6 Mg ha−1. However, one year after the removal of 121.6 m3 ha−1 of timber trees, AGB declined by 16.9%. Variation in AGB both before and after logging was better explained by species dominance and functional diversity than by species richness. In particular, the dominance of certain species influenced carbon storage before and after logging, due, in part, to environmental filtering of species based on plant functional types and/or life form. While C storage in trees was associated with LAI before logging, LAI was most important for liana C storage after logging. There were significant differences (P ≤ 0.05) in seasonal variation of soil respiration before and after logging, and between a 10- and 20-year post-logging stands with soil respiration higher in the wet season. Similarly, there were significant differences (P ≤ 0.05) in seasonal variation among components of soil respiration in the 10- and 20-year post-logging stands. Autotrophic soil respiration was 33% higher in the 20-year post-logging stand while heterotrophic soil respiration remained similar between the two stands. In general, soil moisture was the most important factor influencing soil respiration across the post-logging stands and for components of soil respiration, particularly root and mycorrhizal respiration. This information about patterns and underlying controls on soil respiration from different soil components should aid attempts to accurately model soil respiration over space and time.
Author: Vincent De Paul Medjibe Publisher: ISBN: Category : Languages : en Pages : 235
Book Description
Logging intensities were light and differed among the three sites, but no short-term effects of logging were detected on tree species richness. At the TFF-RIL site, the initial biomass declined by 4.1% with committed emissions of 17 Mg ha-1. At the FSC site, the biomass declined by 2.9% with committed emissions of 11.2 Mg ha-1. At the CL site, biomass declined by 6.3% with committed emissions of 24.6 Mg ha-1. Based on a matrix model and with the observed logging intensity at the TFF-RIL site, stand volume is predicted to recover about 21 years after logging. Post-harvest tree abundance and biomass increment were sensitive to tree mortality. A meta-analysis of logging costs revealed substantial variation but RIL was more costly to implement than CL when these costs were calculated either per timber volume harvested or per hectare logged. In conclusion, selective logging causes carbon emissions that can be reduced through use of improved forest management.
Author: Neville Ash Publisher: Island Press ISBN: 1597267112 Category : Nature Languages : en Pages : 285
Book Description
The Millennium Ecosystem Assessment (MA) is the most extensive study ever of the linkages between the world's ecosystems and human well-being. It is one of the most important conservation initiatives ever undertaken, and the ecosystem services paradigm on which it is based provides the standard for practice. This manual supplies the specific tools that practitioners of the paradigm need in order to extend their work into the future. The manual is a stand-alone "how to" guide to conducting assessments of the impacts on humans of ecosystem changes. It builds on the experiences and lessons learned from the MA global and sub-global assessment initiatives, with chapters written by well-known participants in those initiatives. It also includes insights gained from service-focused assessment activities since the completion of the MA in 2005.
Author: David B. Lindenmayer Publisher: Island Press ISBN: 1610911466 Category : Science Languages : en Pages : 247
Book Description
Salvage logging—removing trees from a forested area in the wake of a catastrophic event such as a wildfire or hurricane—is highly controversial. Policymakers and those with an economic interest in harvesting trees typically argue that damaged areas should be logged so as to avoid “wasting” resources, while many forest ecologists contend that removing trees following a disturbance is harmful to a variety of forest species and can interfere with the natural process of ecosystem recovery. Salvage Logging and Its Ecological Consequences brings together three leading experts on forest ecology to explore a wide range of issues surrounding the practice of salvage logging. They gather and synthesize the latest research and information about its economic and ecological costs and benefits, and consider the impacts of salvage logging on ecosystem processes and biodiversity. The book examines • what salvage logging is and why it is controversial • natural and human disturbance regimes in forested ecosystems • differences between salvage harvesting and traditional timber harvesting • scientifically documented ecological impacts of salvage operations • the importance of land management objectives in determining appropriate post-disturbance interventions Brief case studies from around the world highlight a variety of projects, including operations that have followed wildfires, storms, volcanic eruptions, and insect infestations. In the final chapter, the authors discuss policy management implications and offer prescriptions for mitigating the impacts of future salvage harvesting efforts. Salvage Logging and Its Ecological Consequences is a “must-read” volume for policymakers, students, academics, practitioners, and professionals involved in all aspects of forest management, natural resource planning, and forest conservation.
Author: Rodine Tchiofo Lontsi Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Tropical forests play an important role in climate change mitigation through carbon sequestration in the vegetation and soils, which can be released to the atmosphere through deforestation and forest degradation. One of the key drivers of tropical forest degradation is selective logging, which is the most common timber harvesting practice in the tropics. Selective logging in Cameroon involves harvesting only trees of commercially important species that have reached the minimum harvestable diameter at breast height, as defined by the forest administration. In general, less than one tree is h...
Author: 
Author: 
Author: Vincent De Paul Medjibe
Author: 
Author: Neville Ash
Author: Erica A. Howard
Author: Andrew Grieser Johns
Author: David B. Lindenmayer
Author: Dennis P. Dykstra
Author: Climate Change Science Program (U.S.)
Author: Rodine Tchiofo Lontsi