Download or read book Measurement of Denitrification in Undisturbed Salt Marsh Sediments written by Stephen Allen Collins and published by . This book was released on 1981 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Denitrification in the Nitrogen Cycle of New England Salt Marshes written by Michael Robert Hamersley and published by . This book was released on 2002 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Allochthonous denitrification accounted for 39% of total sediment denitrification (2.7 mol N m−2 yr−1). 46% of remineralized ammonium was denitrified, while the contribution of autochthonous denitrification to 02 and C02 fluxes was 18% and 10%, respectively. A 15N-ammonium tracer was used to study competition between plants and nitrifying bacteria for remineralized ammonium. In undisturbed sediments of Spartina alterniflora, plant uptake out-competed nitrification-denitrification, with plant uptake accounting for 66% of remineralized ammonium during the growing season. Under N fertilization (15.5 mol m−2 yr−1), both plant N uptake and denitrification increased, but denitrification dominated, accounting for 72% of the available N. When plant uptake was hydrologically suppressed, nitrification-denitrification was stimulated by the excess N, shifting the competitive balance toward denitrification.
Download or read book Effects of Oil And Dispersant on Denitrification and Organic Matter Mineralization in a Louisiana Salt Marsh Sediment written by Hanh Thi Van Le and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the fate and behavior of oil and dispersants on biogeochemical processes in sediments, especially denitrification and mineralization of organic matter, is essential in a remediation strategy for wetland ecosystems after oil spills. The study set out to explore how denitrification and mineralization can be influenced by exposure to different oil/dispersant ratios under aerobic and anaerobic conditions for different exposure times. Denitrication was represented via N2O production using an acetylene blockage technique, while mineralization was measured by CO2 production. Results suggest that the addition of oil/dispersant immediately inhibited denitrification. When exposure time increased, aerobic sediments exhibited a far higher denitrification rate, while anaerobic sediments showed a negative correlation between denitrification rates and dispersant concentrations. Compared to aerobic sediments, anaerobic sediments had a lower denitrification rate for a short exposure time, but a higher rate for long exposure time. The presence of oil/dispersant significantly enhanced mineralization of organic matter under both aerobic and anaerobic conditions in all exposure times. The sediment was historically exposed to oil instead of dispersant, microorganisms may adapt to the presence of oil but be harmed by the presence of dispersant. Besides biotic factors, other changes in environmental conditions can also influence denitrification and mineralization activities.
Download or read book The Effect of Salinity on Denitrification in Saltmarsh Sediments written by Cathy Lynne Cook and published by . This book was released on 1979 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Processes and Wastes in the Ocean written by Judith M. Capuzzo and published by Krieger Publishing Company. This book was released on 1987 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Northeastern Geology written by and published by . This book was released on 1982 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Denitrification in a Massachusetts Salt Marsh written by Warren Allan Kaplan and published by . This book was released on 1977 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Anthropogenic Impacts on the Microbial Ecology and Function of Aquatic Environments written by Maurizio Labbate and published by Frontiers Media SA. This book was released on 2016-09-06 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquatic ecosystems are currently experiencing unprecedented levels of impact from human activities including over-exploitation of resources, habitat destruction, pollution and the influence of climate change. The impacts of these activities on the microbial ecology of aquatic environments are only now beginning to be defined. One of the many implications of environmental degradation and climate change is the geographical expansion of disease- causing microbes such as those from the Vibrio genus. Elevating sea surface temperatures correlate with increasing Vibrio numbers and disease in marine animals (e.g. corals) and humans. Contamination of aquatic environments with heavy metals and other pollutants affects microbial ecology with downstream effects on biogeochemical cycles and nutrient turnover. Also of importance is the pollution of aquatic environments with antibiotics, resistance genes and the mobile genetic elements that house resistance genes from human and animal waste. Such contaminated environments act as a source of resistance genes long after an antibiotic has ceased being used in the community. Environments contaminated with mobile genetic elements that are adapted to human commensals and pathogens function to capture new resistance genes for potential reintroduction back into clinical environments. This research topic encompasses these diverse topics and describes the affect(s) of human activity on the microbial ecology and function in aquatic environments and, describes methods of restoration and for modelling disturbances.
Download or read book Contribution of Sulfate Reducing Bacteria to Nitrogen Fixation in Salt Marsh Sediments written by Edwin L. Gandy and published by . This book was released on 1987 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 1967 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology written by and published by . This book was released on 1986 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publishes essays and articles that report and interpret the results of original scientific research in basic and applied ecology.
Download or read book Ecological Engineering for Wastewater Treatment written by Carl Etnier and published by CRC Press. This book was released on 2013-10-23 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new science of ecological engineering is winning increasing acceptance all over the world. Established industrial economies like Sweden and the United States are investing more in it as initial skepticism and regulatory hurdles are giving way to burgeoning investments by companies and municipalities, increased research activity, and great inter
Download or read book Microbiology of wetlands written by Paul Bodelier and published by Frontiers E-books. This book was released on 2013-07-08 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Watersaturated soil and sediment ecosystems (i.e. wetlands) are ecologically as well as economically important systems due to their high productivity, their nutrient (re)cycling capacities and their prominent contribution to global greenhouse gas emissions. Being on the transition between terrestrial and – aquatic ecosystems, wetlands are buffers for terrestrial run off thereby preventing eutrophication of inland as well as coastal waters. The close proximity of oxic-anoxic conditions, often created by wetland plant roots, facilitates the simultaneous activity of aerobic as well as anaerobic microbial communities. Input of nutrients and fast recycling due to active aerobes and anaerobes makes these systems highly productive and therefore attractive for humans as well as many other organisms. Wetlands globally are under high pressure due to anthropogenic activities as well as climate change. Changes of land-use as well as altered hydrology due to climate change will lead to disturbance and loss of these habitats. However, the diversity and functioning of microbial communities in wetlands systems in highly underexplored in comparison to soils and aquatic ecosystems. Given the importance of wetlands and their immediate threats combined with the lack of knowledge on the microbiology of these systems is the basis for this special issue, focusing on the current microbiological knowledge and gaps therein to be assessed in future wetland research. Papers (research papers, reviews, perspectives, opinion papers) are welcomed that focus on all aspects that regulate the functioning and community composition of microbes (i.e. bacteria, archaea, protozoa, fungi) in wetland ecosystems (peat, coastal as well as freshwater marshes, flood plains, rice paddies, littoral zones of lakes etc) from all geographic regions. Welcomed topics are physiology, ecology, functioning, biodiversity, biogeography of microbes involved in nutrient cycling (C, N, P, Fe, Mn), green house gas emissions as well as plant-microbe interactions. These studies can be multidisciplinary and cover topics from the molecular to the community level.
Download or read book Benthic Nutrient Cycling in the Pamlico River written by Edward J. Kuenzler and published by . This book was released on 1984 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Denitrification in the Nitrogen Cycle written by Han Golterman and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the papers presented at a Nato Advanced Re search Workshop entitled "DENITRIFICATION IN THE N-CYCLE," held in Braunschweig (W-Germany) from 24 to 27 Mai 1983. All expenses were provided by the North Atlantic Treaty Organization. The scientific programme was in the first instance planned by some members of the Eco-Science Panel under the stimulating organization of Dr. Oscar Ravera and the final programme was prepared in co-operation between Ravera and myself. However, even during the meeting important con tributions were added. The meeting was hosted by the Microbiologi cal Dept. of F.A.L., which also took care of the organizatory as pects. Nitrate is constantly lost from both terrestial and aquatic ecosystems, causing rnixed feelings between ecologists and agricul turists. While bacteriologically very rnuch is known, the ecology of the processes is still poorly understood, nor can it be evaluated what it rneans as an econornic loss for farrners and world food produc tion. Therefore this NATO Advanced Workshop was established to per mit a lirnited nurnber of scientists active in this field to corne to gether for a short while to address the following objectives: 1) To exchange ideas between scientists (bacteriologists and ecologists) and agronornists. 2) To assess the state of the art. 3) To discuss the difficulties of experimentation in the field. 4) To define future research. In order to accornplish these objectives, the workshopwas organ ized in three parts with the following thernes: 1) Bacteriological aspects of dentrification
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1979 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
