Download or read book Nitrogen Inputs to Semi natural Ecosystems written by Birgitte Hansen and published by . This book was released on 1997 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Impact of Nitrogen Deposition on Natural and Semi Natural Ecosystems written by S.J. Langan and published by Springer. This book was released on 2014-11-14 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up-to-date synthesis of the understanding of the interaction between the emission of nitrogen, its deposition and impact on the most important components of natural and semi-natural ecosystems. The work consists of contributions from internationally renowned research scientists. Individual chapters deal with the factors and processes related to nitrogen deposition and soils, non-forest vegetation communities, forest ecosystems, and surface waters. The assessment of these impacts is discussed in terms of setting critical loads. The book is aimed at researchers, advanced course students and policy makers/advisors involved with aspects of the impact of air pollution.
Download or read book The European Nitrogen Assessment written by Mark A. Sutton and published by Cambridge University Press. This book was released on 2011-04-14 with total page 665 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting the first continental-scale assessment of reactive nitrogen in the environment, this book sets the related environmental problems in context by providing a multidisciplinary introduction to the nitrogen cycle processes. Issues of upscaling from farm plot and city to national and continental scales are addressed in detail with emphasis on opportunities for better management at local to global levels. The five key societal threats posed by reactive nitrogen are assessed, providing a framework for joined-up management of the nitrogen cycle in Europe, including the first cost-benefit analysis for different reactive nitrogen forms and future scenarios. Incorporating comprehensive maps, a handy technical synopsis and a summary for policy makers, this landmark volume is an essential reference for academic researchers across a wide range of disciplines, as well as stakeholders and policy makers. It is also a valuable tool in communicating the key environmental issues and future challenges to the wider public.
Download or read book The Impact of Nitrogen Deposition on Natural and Semi Natural Ecosystems written by S.J. Langan and published by Springer. This book was released on 2010-12-09 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up-to-date synthesis of the understanding of the interaction between the emission of nitrogen, its deposition and impact on the most important components of natural and semi-natural ecosystems. The work consists of contributions from internationally renowned research scientists. Individual chapters deal with the factors and processes related to nitrogen deposition and soils, non-forest vegetation communities, forest ecosystems, and surface waters. The assessment of these impacts is discussed in terms of setting critical loads. The book is aimed at researchers, advanced course students and policy makers/advisors involved with aspects of the impact of air pollution.
Download or read book Whole Ecosystem Nitrogen Manipulation written by and published by . This book was released on 2002 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen and Ozone Pollution written by Muhammad Adrees and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last century, inputs of reactive nitrogen (N) to ecosystems have more than doubled as a result of anthropogenic activities. There is strong evidence that N has reduced the diversity of plant species in a range of habitats of high conservation value. The effects of atmospheric N deposition on the structure and functioning of natural and semi-natural ecosystems have been well studied. There has, however, been little investigation of the contrasting effects of reduced versus oxidised N, or of the importance of frequency of inputs. This thesis involves a study which investigates the response of a heath land plant community to different forms of N applied at low & frequent vs infrequent and high levels of N additions. Solutions were applied at one of five intervals: weekly, two weekly, monthly, two monthly and four monthly. In large parts of the UK, ozone (03) critical levels for agricultural crops, forests and semi- natural vegetation are regularly exceeded. In grassland ecosystems, similar effects on major plant functional groups have been reported for both 03 and N, however, their combined effects have rarely been investigated. This thesis investigates how differing levels of N deposition modify the effects of 03 on calcifugous grassland species using an open top chamber fumigation facility at Silwood Park, Ascot. Mesocosms representing a mixed mesic plant community were exposed to different concentrations of 03 (FA, 40, 70 & 100 ppb) under two N regimes (0 & 50 kg N ha-1 y(l) in 2008. In addition, the performance of a representative grass (Festuca ovina) and legume (Trifolium repens) species were tested under differing 03 and N concentrations in 2009. In a final part of the study, cultivars of French bean (Phaseolus vulgaris) bred for contrasting 03 sensitivity were exposed to a range of 03 concentrations under differing levels of N availability. 2 The results revealed that N addition significantly affected the growth and productivity of heath land mesocosms with greater proportional increases in oxidised N rather than reduced treatment. Reduced N significantly lowered soil pH while the opposite effect (increased pH) was seen with the oxidised form. Low dose, more frequent N addition resulted in bigger responses than infrequent applications of larger amounts. The research presented provides an important step to increase knowledge of the influence of both pollutants (N and 03) on grassland within plant community's functional groups. The overall community biomass of mesic grassland and grass/legume mixture declined due to 03 exposure which is a serious concern for habitat biodiversity. High N intensified the legumes sensitivity to elevated 03 and caused a greater biomass reduction than low N. Phaseo/us genotypes (5-156 and R-l23) used in the study responded significantly to 03 exposure which resulted in yield decline and poor performance at elevated 03 levels Nitrogen addition did not result in significant increase or decrease in the yield for either Phaseo/us genotype but a significant interaction effect between 03 and N was observed for 03 injury in the sensitive genotype and less injury was recorded with the higher N treatment.
Download or read book Nitrogen in the Environment Sources Problems and Management written by R.F. Follett and published by Gulf Professional Publishing. This book was released on 2001-12-03 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen in the Environment: Sources, Problems, and Management is the first volume to provide a holistic perspective and comprehensive treatment of nitrogen from field, to ecosystem, to treatment of urban and rural drinking water supplies, while also including a historical overview, human health impacts and policy considerations. It provides a worldwide perspective on nitrogen and agriculture. Nitrogen is one of the most critical elements required in agricultural systems for the production of crops for feed, food and fiber. The ever-increasing world population requires increasing use of nitrogen in agriculture to supply human needs for dietary protein. Worldwide demand for nitrogen will increase as a direct response to increasing population. Strategies and perspectives are considered to improve nitrogen-use efficiency. Issues of nitrogen in crop and human nutrition, and transport and transformations along the continuum from farm field to ground water, watersheds, streams, rivers, and coastal marine environments are discussed. Described are aerial transport of nitrogen from livestock and agricultural systems and the potential for deposition and impacts. The current status of nitrogen in the environment in selected terrestrial and coastal environments and crop and forest ecosystems and development of emerging technologies to minimize nitrogen impacts on the environment are addressed. The nitrogen cycle provides a framework for assessing broad scale or even global strategies to improve nitrogen use efficiency. Growing human populations are the driving force that requires increased nitrogen inputs. These increasing inputs into the food-production system directly result in increased livestock and human-excretory nitrogen contribution into the environment. The scope of this book is diverse, covering a range of topics and issues from furthering our understanding of nitrogen in the environment to policy considerations at both farm and national scales.
Download or read book Fluxes of Nitrogen in a Semi natural Ecosystem written by Rebecca Mckenzie and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clean Coastal Waters written by National Research Council and published by National Academies Press. This book was released on 2000-08-17 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental problems in coastal ecosystems can sometimes be attributed to excess nutrients flowing from upstream watersheds into estuarine settings. This nutrient over-enrichment can result in toxic algal blooms, shellfish poisoning, coral reef destruction, and other harmful outcomes. All U.S. coasts show signs of nutrient over-enrichment, and scientists predict worsening problems in the years ahead. Clean Coastal Waters explains technical aspects of nutrient over-enrichment and proposes both immediate local action by coastal managers and a longer-term national strategy incorporating policy design, classification of affected sites, law and regulation, coordination, and communication. Highlighting the Gulf of Mexico's "Dead Zone," the Pfiesteria outbreak in a tributary of Chesapeake Bay, and other cases, the book explains how nutrients work in the environment, why nitrogen is important, how enrichment turns into over-enrichment, and why some environments are especially susceptible. Economic as well as ecological impacts are examined. In addressing abatement strategies, the committee discusses the importance of monitoring sites, developing useful models of over-enrichment, and setting water quality goals. The book also reviews voluntary programs, mandatory controls, tax incentives, and other policy options for reducing the flow of nutrients from agricultural operations and other sources.
Download or read book Nitrogen the Confer N s written by K. van der Hoek and published by Elsevier. This book was released on 2012-12-02 with total page 813 pages. Available in PDF, EPUB and Kindle. Book excerpt: The First International Nitrogen Conference provided an opportunity for researchers and decision-makers to exchange information on environmental pollution by nitrogen compounds on three scales: global, continental/regional and local. The main topics were air, ground water and surface water pollution; emission sources, atmospheric chemistry, deposition processes and effects; disturbance of nitrogen cycles, critical loads and levels; assessments, policy development and evaluation; target groups and abatement techniques; and new approaches leading to an integrated abatement strategy.The peer-reviewed papers from the Conference presented in this volume will provide readers with a comprehensive review of the transport, deposition and impact on ecosystems of nitrogen.
Download or read book Advances in Ecological Research written by and published by Academic Press. This book was released on 1993-06-10 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: The six articles in this issue of Advances in Ecological Research cover a wide spectrum of ecology to ecology to munities, the discussion of vegetation change on a longer time scale, and the significance of conservation, especially in the industrialized world.S.J. Hall and D.G. Raff provide something of interest to all ecologists. Several common themes are presented in this volume including the dynamics of communities with such examples as Glacier Bat and Mount St.Helens.* SPECIAL FEATURES:* Lively selection of review on topical subjects.
Download or read book Acid Rain Deposition to Recovery written by Peter Brimblecombe and published by Springer Science & Business Media. This book was released on 2007-12-11 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book looks at the sources and composition of the atmosphere and rainfall, with particular attention on acidifying components and those that affect ecosystems. It further widens the subject to look at trace metals. It includes papers on the impact of deposition on soils and forests and the recovery of the natural environment. Work on critical loads makes a contribution to understanding the degree to which deposition must be reduced to limit its impact.
Download or read book New Perspectives on Nitrogen Cycling in the Temperate and Tropical Americas written by Alan R. Townsend and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inputs of nitrogen to terrestrial and aquatic ecosystems have increased several-fold over the last one hundred and fifty years, with the steepest increases during the last four decades. The expansion of fertilizer manu facture and use, the increase in fossil fuel combustion, the intensification of animal husbandry, and widespread cultivation of N2 fixing crops have all contributed to the dramatic increase in N inputs. The increase has been most rapid in Northern Hemisphere (NH) temperate ecosystems, but presently subtropical and tropical regions of Asia are also experiencing an explosive increase in N inputs to terrestrial ecosystems (W. Chameides, pers. comm. ; Galloway et al. 1996). Projected increases in N deposition for these trop ical and subtropical regions, with a high natural background of N inputs, exceed increases projected for temperate and arctic regions (Cleveland et al. submitted; Galloway et al. 1994; Holland & Lamarque 1997a). Compared to biological N fixation, N deposition is becoming a proportionately greater source of N to terrestrial and aquatic ecosystems worldwide (Vitousek et al. 1997). 6 The nitrogen contained in the atmosphere as N , 3. 9 * 10 Tg (Tg = 2 12 10 g), is the largest reservoir of N in the Earth system (Warneck 1988). However, this paper focuses on the nitrogen emissions and deposition that have been transformed from N2 into reactive forms that are biologically avail able (e. g. Vitousek et al. 1997).
Download or read book The Impact of Nitrogen Deposition on Natural and Semi Natural Ecosystems written by SJ. Langan and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon and Nitrogen Cycling in European Forest Ecosystems written by Ernst-Detlef Schulze and published by Springer Science & Business Media. This book was released on 2013-12-01 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume quantifies carbon storage in managed forest ecosystems not only in biomass, but also in all soil compartments. It investigates the interaction between the carbon and nitrogen cycles by working along a north-south transect through Europe that starts in northern Sweden, passes through a N-deposition maximum in central Europe and ends in Italy. For the first time biogeochemical processes are linked to biodiversity on a large geographic scale and with special focus on soil organisms. The accompanying CD-ROM provides a complete database of all flux, storage and species observations for modellers.
Download or read book Nitrogen in Terrestrial Ecosystems written by Carl O. Tamm and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen is a key element in ecosystem processes. Aspects of local and global changes in nitrogen in both undisturbed and disturbed conditions are discussed. Environmental changes caused by pollution from nitrogenous compounds and changes in landuse are also described. Organisms, plants, animals and microorganisms are all affecting nitrogen supply. Emphasis is placed on natural and anthropogenic transfer of nitrogen between ecosystems and also on the interaction of nitrogen with other bioelements.
Download or read book Environmental Indicators for Agriculture Methods and Results Volume 3 written by OECD and published by OECD Publishing. This book was released on 2001-03-13 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive study to review and take stock in OECD countries of progress in developing indicators to measure the environmental performance of agriculture.
