Download or read book The Impact of Anthropogenic Disturbance on Soil Microbial Community Composition and Activity written by Corianne Tatariw and published by . This book was released on 2016 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Response of Soil Microbial Communities to Physical and Chemical Disturbances written by Guilherme M. Chaer and published by . This book was released on 2008 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: General introduction; Land use impact on the stability of soil microbial community composition and enzyme activities to heat shock; Shifts in microbial community composition and physiological profiles across a gradient of induced soil degradation (GRIND); Development and validation of a soil quality index based on the equilibrium between soil organic matter and biochemical properties in an undisturbed forest ecosystem. The objectives of this thesis were to evaluate the responses of soil microbial communities to physical and chemical disturbances, and associate these responses with soil functional stability and changes in soil quality. The first study consisted of application of heat shocks (HS) to soils with contrasting land use history to evaluate differences in the stability of soil enzymes (laccase, cellulase and fluorescein diacetate hydrolysis) and microbial community composition as determined by phospholipid fatty acid (PLFA) analysis. The conversion of land use from forest to agriculture resulted in a new microbial community that was less functionally stable. Loss of stability was indicated by the reduced of laccase and cellulase activities in the agricultural soil, which suggested a less diverse community of microorganisms capable of producing these enzymes. The second study examined changes in microbial community composition and diversity that occurred across a gradient of soil disturbance. Disturbances were simulated by tillage events applied at different intensities to a 12-year-old fallow area. These treatments caused degradation of several soil physico-chemical properties, and alterations in microbial structure based on PLFA and terminal restriction fragment length polymorphism (T-RFLP) analyses, and in metabolic potential based on community level physiological profiles (CLPPs). Multivariate ordination of soil properties revealed the formation of a linear gradient of soil degradation that was significantly correlated with CLPPs, but not with T-RFLP and PLFA profiles. Nevertheless, changes observed in microbial community structure were significantly associated with decreases in soil organic C and field hydraulic conductivity. The third study demonstrated that undisturbed forest soils from western Oregon express an equilibrium between soil organic matter and biochemical properties. A model fitted through multiple regression analysis showed that phosphatase activity and microbial biomass were able to explain 97% of the soil organic C in these soils. This equilibrium was disrupted when a soil from an old-growth site was submitted to chemical stresses (Cu addition or pH alteration) and physical disturbances (wet-dry or freeze-thaw cycles). The magnitude of this disruption was consistently expressed by the ratio between soil C predicted by the model (Cp), and soil C that was measured (Cm). This ratio is proposed as biochemically-based index of soil quality.

Download or read book Diversity and Functionality of Soil Microbial Communities in Degraded Arid Rangelands written by Lori K. Schwab-Uchanski and published by . This book was released on 2014 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional diversity of the soil microbial community is commonly used to describe soil health. Microenvironment heterogeneity in environmental stresses, including anthropogenic-included heterogeneity, may induce reversible or irreversible changes in genetic and functional diversity. Functional redundancy in a microbial population may mitigate variability in genetic diversity. Thus, it is unclear at what point human activity may affect functionality of soil microbial consortia and how this may relate to changes in microbial population diversity. I evaluated the impact of anthropogenic environmental impacts associated with extensive grazing and natural gas extraction, common in the arid Southwestern United States, on the total microbial diversity profiles and the total soil catabolic profiles as described by carbon substrate induced respiration. Total bacterial diversity was evaluated by 16S-based tag-encoded FLX amplicon pyrosequencing (bTEFAP) modified to use the Titanium sequencing platform. Substrate induced respiration, measured using the Microresp[trademark symbol] system, was evaluated for various relevant carbon sources (simple and polymeric sugars, amino acids, carboxylic acids, and fatty acids). Results indicate that under the tested scenarios cyanobacteria and some microfungal communities are nearly eliminated; the diversity of the other bacterial taxa was similar across disturbance regimes, indicating bacterial resilience and persistence in arid soils. Microbial activity was greatest and most variable in sites exposed to disturbance (grazing, natural gas extraction) suggesting that higher functional diversity is a population level adaptation to the disturbance.

Download or read book Soil Fauna Assemblages written by Uffe N. Nielsen and published by Cambridge University Press. This book was released on 2019-03-28 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: A holistic overview of soil fauna, their contributions to ecosystem function, and implications of global change belowground.

Download or read book Birds as Useful Indicators of High Nature Value Farmlands written by Federico Morelli and published by Springer. This book was released on 2018-07-13 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book helps to establish a simple framework to identify and use bird species as a bioindicator for high nature value (HNV) farmlands. This book focuses on suitable methods for monitoring the HNV areas, and presents the results of several case studies. The chapters put forward ways to integrate ecosystems assessment, geographical information systems (GIS) and strategies for conservation of local biodiversity. An innovative framework focuses on the use of species distribution models (SDMs) in order to explore the importance of each characteristic of HNV farmlands. Furthermore, the book examines the relationships among bird species richness, land use diversity and landscape metrics at a local scale in the farmlands.

Download or read book Links Between Soil Microbial Communities and Transformations of Soil Carbon and Nitrogen Along a Gradient in Land use History and Soil Disturbance written by Kerri Loraine Steenwerth and published by . This book was released on 2003 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Manual of Environmental Microbiology written by Christon J. Hurst and published by American Society for Microbiology Press. This book was released on 2007-05-14 with total page 3023 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most definitive manual of microbes in air, water, and soil and their impact on human health and welfare. • Incorporates a summary of the latest methodology used to study the activity and fate of microorganisms in various environments. • Synthesizes the latest information on the assessment of microbial presence and microbial activity in natural and artificial environments. • Features a section on biotransformation and biodegradation. • Serves as an indispensable reference for environmental microbiologists, microbial ecologists, and environmental engineers, as well as those interested in human diseases, water and wastewater treatment, and biotechnology.

Download or read book Soil Contamination and Remediation Effects on the Structure and Activity of Soil Microbial Communities written by M.V. Bindu and published by Anchor Academic Publishing. This book was released on 2016-08 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil can be defined as the space time continuum forming the upper part of the earth’s crust. It is a natural body comprised of solid, liquid and gases that occur on the land surface. Joffe (1949) defined soil as a natural body differentiated into horizons of mineral and organic constituents usually unconsolidated of variable depth, which differs from the parent material below in morphology, physical properties and constitution, chemical properties and composition, and biological characteristics. Soil is one of the most fundamental resources for sustainability and survival. It is one of the most important assets to protect and pass on to future generations. Soil contamination due to anthropogenic and natural sources is increasing day by day because of increasing population, industrialization, and urbanization. Soil is the receptor of many contaminants from various sources. Contamination decreases the quality of the soil and adversely affects soil organisms. For this study, soil samples from thirteen locations contaminated from agricultural, industrial, and organic sources spread over the districts of Alappuzha and Kottayam in Kerala in the south west coast area of India were analyzed to study the changes in soil characteristics and its influence on soil microbial communities and their activities.

Download or read book Invasive Species in Forests and Rangelands of the United States written by Therese M. Poland and published by Springer Nature. This book was released on 2021-02-01 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book describes the serious threat of invasive species to native ecosystems. Invasive species have caused and will continue to cause enormous ecological and economic damage with ever increasing world trade. This multi-disciplinary book, written by over 100 national experts, presents the latest research on a wide range of natural science and social science fields that explore the ecology, impacts, and practical tools for management of invasive species. It covers species of all taxonomic groups from insects and pathogens, to plants, vertebrates, and aquatic organisms that impact a diversity of habitats in forests, rangelands and grasslands of the United States. It is well-illustrated, provides summaries of the most important invasive species and issues impacting all regions of the country, and includes a comprehensive primary reference list for each topic. This scientific synthesis provides the cultural, economic, scientific and social context for addressing environmental challenges posed by invasive species and will be a valuable resource for scholars, policy makers, natural resource managers and practitioners.

Download or read book Environmental Impacts of Soil Component Interactions written by P. M. Huang and published by CRC Press. This book was released on 1995-03-29 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: V. 1 - Natural and anthropogenic organics; v. 2 - Metals, other inorganics, and microbial activities. General soil quality as influenced by interactions of soil minerals with organics and microorganisms: Organic-inorganic interections in soils and their effects on soil quality; Sorption phenomena between inorganic and organic compounds in soils: impacts on transformation processes; Role of aluminium and iron in the accumulation of organic matter in soils with variable charge; Sorption of ions by soil organic matter and clay-organics at low ionic strength; Water potential, soil microhabitats, and microbial development; Effect of citric acid on interlayer adsorption of hydroxy-aluminosilicate ions by montmorillonite; Microbial oxidation of pyrites in relation to its efficiency in alkali soil reclamation; Modification of gelation properties of colloidal solids from oil sands: extraction impact on fine tailings formation; Position paper of part I; Transformations of natural and anthropogenic organic compounds as affected by soil minerals and microorganisms: Natural organics; Recent advances in organomineral interactions: implications for carbon cycling and soil structure; The role of short-range ordered mineral colloids in abiotic transformations of organics components in the environment; Influence of pyrogallol on the catalytic action of iron and managenese oxides in amino acid transformation; Photochemical effect on the abiotic transformations of polyphenolics as catalyzed by Mn(IV) oxide; Potential of the supercitical fluid extraction technique for characterizing organic-inorganic interactions in soils; Dissolution and fractionation of calcium-bound and iron-and aluminium-bound humus in soils; Rhe quality of soil organic matter as characterized by soil CPMAS C-NMR, and Py-FIMS; Extracellular polysaccharides: an interface between microorganisms and soil constituents; Low-molecular-weigh aliphatic carboxylic acids in some andisols of Japan; Relationship between organic acids and microorganisms on a kong-term cropping site in southeastern Australia; Effect of the addition of plant residues on the mineralization of sulfur in Costa Rican soils; Anthropogenic organics: Sorption and biodegradation of organic contaminants in soils: conceptual representations of process coupling; The role of dissolved metals and metal-containing surfaces in catalyzing the hydrolysis of organic pollutants; The role of abiotic and biotic catalysts in the transformation of phenolic compounds; The role of abiotic interections with humic substances on the environmental impact of organic pollutants; Adsorption mechanisms and abiotic catalytic transformations of some agrochemicals by clay minerals; Interactions between manganese oxides and multiple ringed aromatic compounds; Mobility and persistence of metolachlor and terbuthylazine in field lysimeters; Soil-pesticide interactions and their impact on the volatilization process; Factors affecting the movements, reactions, and biotransformations ox xenobiotics; Effect of soil minerals on the microbial formation of enzymes and their possible use in remediation of chemically polluted sites; Position paper of part II; Effect of microorganisms on mobility of heavy metals in soils; Interactions of copper with soil humic substances; Adsorption of phosphate on variable charge minerals: competitive effect of organic ligands; Cadmium adsorption on the hydroxyaluminum-montmorillonite complex as influencend by oxalate; Influence of citrate on selenite sorption-desorption on short-range ordered aluminum hydroxides; Role of amorphous fe oxides in controlling retention of heavy metal elements in soils; Effect of natural organic matter and pH on the bioavailability of metal ions in soils; Seasonal changes of organic matter, pH, nitrogen and some metals in forest topsoils in Austria: a case study of two soils with and whithout a litter layer; Substituion of rock phosphate and legumes for commercial fertilizers; Effect of single and combined inoculation with azotobacter and VA mycorrhizal fungi on growth and mineral nutrient contents of maize and wheat plants; Position paper of part I; Interactions of clays with microorganisms and bacterial survival in soil: a physicochemical perspective; Enumeration, survival, and beneficial activities of microorganisms introduced into soil; Effects of clay minerals, oxyhydroxides, and humic matter on microbial communities of soil, sediment, and water; Activity, stability, and kinetc properties of enzymes immobilized on clay minerals and organomineral complexes; Influence of site conditions and heavy metals on enzyme activities of forest topsoils; Aluminum toxicity: a major stress for microbes in the environment; Biological response to contamination with pentachlorophenol and mercuric chloride in a high organic matter soil; Ecology of 2,4-D degradation in three palouse silt loam soils.

Download or read book Microbial Community Composition in Response to Soil Factors and Disturbance on Serpentine Soils written by Shira Hava Degrood and published by . This book was released on 2005 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Biological Communities and Ecosystem Resilience written by Martin Lukac and published by Springer. This book was released on 2017-10-06 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume explores current knowledge and methods used to study soil organisms and to attribute their activity to wider ecosystem functions. Biodiversity not only responds to environmental change, but has also been shown to be one of the key drivers of ecosystem function and service delivery. Soil biodiversity in tree-dominated ecosystems is also governed by these principles, the structure of soil biological communities is clearly determined by environmental, as well as spatial, temporal and hierarchical factors. Global environmental change, together with land-use change and ecosystem management by humans, impacts the aboveground structure and composition of tree ecosystems. Due to existing knowledge of the close links between the above- and belowground parts of terrestrial ecosystems, we know that soil biodiversity is also impacted. However, very little is known about the nature of these impacts; effects on the overall level of biodiversity, the magnitude and diversity of functions soil biodiversity generates, but also on the present and future stability of tree ecosystems and soils. Even though much remains to be learned about the relationships between soil biodiversity and tree ecosystem functionality, it is clear that better effort needs to be made to describe and understand key processes which take place in soils and are driven by soil biota.

Download or read book Soil Microbial Community Structure and Allocation are Critical Drivers of Ecosystem Functioning written by Colin Averill and published by . This book was released on 2015 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The functioning of terrestrial ecosystems is entirely dependent on the activity of autotrophic primary producers and microbial decomposers, and how they are affected by climate, mineralogy and anthropogenic change. Ecosystem ecology has classically focused on how allocation and community composition of plant primary producers may alter predictions of future ecosystem functioning in the face of environmental change. Little attention has been paid to allocation and community composition of microbial decomposers. The functioning of microbial decomposers has been considered implicitly, in the context of plant traits; primarily plant biomass chemistry. However, soil microbial communities represent a vast diversity of taxa spanning multiple kingdoms of life and an array of functional groups. It is not only likely, but probable that understanding ecological aspects of soil microbial community structure, activity, and allocation will fundamentally change how we understand and predict ecosystem function in the future. In chapters 1-3 of this dissertation, I explicitly considered how microbial activities varied based on microbial community structure and the resulting impacts for biogeochemical cycling. Specifically, in chapters 1 and 2, I manipulated the relative abundance of symbiotic root fungi to demonstrate that competition between symbionts and free-living decomposers for nitrogen slowed soil carbon cycling. In chapter 3, I scaled how nitrogen is partitioned between plants, mycorrhizas and free-living decomposer microbes to demonstrate how shifts in microbial community structure could explain how forests productivity is sustained over centuries. In chapter 4, I developed a microbial allocation framework that explicitly considers microbial resource environments. I demonstrated that past microbial allocation frameworks based on plant ecological mechanisms cannot explain allocation patterns of decomposer microbial life. Throughout this dissertation I attempt to put soil microbial life in an explicit ecological context that challenges current understanding of ecosystem process and will allow for deeper understanding and prediction of ecosystem functioning. Incorporating microbial community structure, allocation, and simple ecological mechanisms into models will improve the predictive power of ecosystem ecology.

Download or read book New Trends in Environmental Engineering Agriculture Food Production and Analysis written by Wojciech Janczukowicz and published by MDPI. This book was released on 2021-09-02 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue presents the latest advances in agriculture, aquaculture, food technology and environmental protection and engineering, discussing, among others, the following issues: new technologies in water, stormwater and wastewater treatment; water saving, lake restoration; new sludge and waste management systems; biodiesel production from animal fat waste; the microbiological quality of compound fish feeds for aquaculture; the role of technological processes to improve food quality and safety; new trends in the analysis of food and food components including in vitro, in vivo, and in silico analyses; and functional and structural aspects of bioactivities of food molecules.

Download or read book The Effects of Anthropogenic Stress on Nitrogen cycling Microbial Communities in Temperate and Tropical Soils written by George S. Hamaoui (Jr.) and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation several research studies are discussed that characterize the effects of anthropogenic, or human-induced, stress on both ammonia-oxidizing and total bacterial soil microbial communities. The disturbances of land-use change in tropical, South American rainforests and artificial warming and nitrogen (N) fertilization in temperate, North American forests were investigated as these disturbances represent past and current disturbances caused by human landscape alteration and climate change. Initially, the response of soil ammonia-oxidizing microbial communities to land-use change from primary rainforest to pasture and, finally, back to secondary forest was determined. Next, these analyses of land-use change effects were expanded to the total bacterial community in these rainforest soils sampled annually for three years. Lastly, the effects of increasing soil temperature and N-deposition on ammonia-oxidizing microbial communities in temperate forests were characterized. Land-use change affected ammonia-oxidizing communities in tropical soils. Both the abundance of ammonia-oxidizer marker genes and their community structure shifted due to land-use changes. Interestingly, phylogenetic analyses showed that community structural changes in ammonia-oxidizing thaumarchaea are driven by a shift away from primary rainforest, old pasture, and secondary forest clusters to separate clusters for young pasture. Additionally, there was a nearly complete disappearance in young pasture, old pasture, and secondary forest sites of a thaumarchaeal ammonia-oxidizing genus, the Nitrosotalea. We found that many of the bacterial community responses to land-use change stayed consistent between land-use types across all three years, especially in regards to OTU richness and Faith's phylogenetic diversity. Bacterial community turnover, or distance-decay, was significantly greater (P 0.05) in forests compared to pastures for two out of three years sampled. Lastly, two bacterial species, Rhodomicrobium udaipurense and Anaeromyxobacter dehalogens, were found to be exclusive indicator species for the pasture land-use type across all sampling time points. Finally, when investigating the effects of increasing soil temperatures and N-deposition rates on temperate forest soil N-cycling, potential N-mineralization and nitrification rates and chitinase enzyme activity showed no difference between treatments (P 0.05). Bacterial, fungal, and archaeal rRNA genes and thaumarchaeal amoA genes showed no significant difference between treatments. There were significant differences in ammonia-oxidizer community structure between control and heated plus nitrogen treatments. The majority of archaeal ammonia-oxidizer species were most closely related to Nitrosotalea and Nitrososphaera spp. However, the organic horizon in the heated plus nitrogen treatment was dominated by sequences most closely related to Nitrosopumilus maritimus. Taken together, these results can provide a conceptual foundation as to how anthropogenic stressors can alter microbial communities in tropical and temperate forests soils. These communities are critical to global biogeochemical cycling and climate regulation. By charactering how these communities respond to various anthropogenic stressors, the scientific community can begin to use this information to develop more holistic biogeochemical models to predict shifts in nutrient flow and greenhouse gas production.

Download or read book Advances in Agronomy written by Donald L. Sparks and published by Academic Press. This book was released on 2022-08-04 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy, Volume 175, the latest release in this leading reference on agronomy, contains a variety of updates and highlights new advances in the field. Each chapter is written by an international board of authors. - Includes numerous, timely, state-of-the-art reviews on the latest advancements in agronomy - Features distinguished, well recognized authors from around the world - Builds upon this venerable and iconic review series - Covers the extensive variety and breadth of subject matter in the crop and soil sciences

Download or read book Soil Contamination Research Trends written by Javier B. Domínguez and published by Nova Publishers. This book was released on 2008 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil contamination is the presence of man-made chemicals or other alteration in the natural soil environment. This type of contamination typically arises from the rupture of underground storage tanks, application of pesticides, percolation of contaminated surface water to subsurface strata, leaching of wastes from landfills or direct discharge of industrial wastes to the soil. The most common chemicals involved are petroleum hydrocarbons, solvents, pesticides, lead and other heavy metals. This occurrence of this phenomenon is correlated with the degree of industrialisation and intensity of chemical usage. The concern over soil contamination stems primarily from health risks, both of direct contact and from secondary contamination of water supplies. Mapping of contaminated soil sites and the resulting cleanup are time consuming and expensive tasks, requiring extensive amounts of geology, hydrology, chemistry and computer modelling skills. This book presents the latest research from around the world in this field.