Download or read book Bacterial Community Structure in Soils of the Oldest Agronomic Experiment Fields in the United States the Morrow Plots and of the Original Tallgrass Prairie written by Abiramasundari Ganesan and published by . This book was released on 2019 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diversity of soil microbial communities and their influence on plants growth are widely studied to develop and improve sustainable agricultural practices. Soil-microbe interactions are very complex to interpret given that it involves other biotic and abiotic environmental factors, and the traditional culture-based methods followed by physicochemical analysis are either extremely laborious or not robust enough to investigate the broad picture and intricate details of these complex interactions. The use of molecular technologies like qPCR has resolved some of the shortcomings of culture-based methods, but still exhibited biases in both qualitative and quantitative analyses of microbial communities. New molecular techniques that focus on high throughput DNA sequencing techniques such as 454 pyrosequencing and the MiSeq sequencing platforms revolutionized the field of microbial diversity studies. These techniques are widely used in projects such as the Earth Microbiome Project (EMP), a collective attempt to establish microbial fingerprints in different environments of the planet. Additional applications include studies on long-term effects of crop rotation and different fertilization regimen on bacterial community structure. We tried to build on these studies and assess microbial community structure in the Morrow Plots, the oldest agronomic experimental fields in the United States, and adjacent tallgrass prairie with emphasis on members of the genus Frankia. The Morrow Plots were established in 1876 on tallgrass prairie soils to evaluate the effects of different cropping systems and soil treatments on crop yields, and include the oldest continuous corn plots in the world. Illumina-based l 6S rRNA V3 gene amplicon sequencing retrieved a total of 26.4 7 M effective sequences obtained from 44 samples, i.e. 12 soils with different vegetation and fertilization regimen, and 3 to 6 replicates per soil, with 313,695 to 906,328 reads per sample. At a sequencing depth of 300,000 sequences for each sample, Acidobacteria, Actinobacteria, Proteobacteria and Verrumicrobia were the most abundant bacterial phyla present across all soil samples accounting for 74±4% of the reads. Crop rotation increased diversity of the bacterial community, which was also affected by the fertilization regimen. Reads representing frankiae accounted for 0.1 to 1.0% of all reads, with generally higher percentages in fertilized soils. Reads represented frankiae of clusters la, 2, 3, and 4, but also a group of frankiae that could not reliably be assigned to a cultured relative. The results provide evidence of long-term establishment of Frankia populations in agricultural soils under different management conditions.
Download or read book Dynamics of Microbial Community Structure and Function in a Tallgrass Prairie Ecosystem written by Allison Michelle Veach and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to agricultural practices and urbanization, tallgrass prairie ecosystems have become threatened as
Download or read book Bacterial Communities Under Soil Disturbance from Experimental Mixing in the Lab to Tillage and Bioturbation in the Field written by Jaimie West and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil microhabitats are heterogeneous, disconnected, and isolated. Thus, soil supports a vast diversity of microbial inhabitants. How do physical disturbances-which disrupt soil microhabitats-affect bacterial community composition and community assembly processes (e.g., selection and dispersal)? Starting in the lab, we evaluated how bacterial communities are affected by soil mixing at various frequencies over a 16-week incubation. We hypothesized that soil mixing would decrease bacterial richness, and that community assembly would be driven by homogenizing dispersal and homogeneous selection. Using 16S rRNA gene sequencing, we found support for our hypotheses, and results further implied that the vast diversity observed in soil is a direct function of the generally unmixed, isolated nature of microbial communities. When we recapitulated this soil mixing experiment under anoxic conditions, findings corroborated the original study: soil mixing homogenized bacterial communities and increased fast growth potential, regardless of oxygen regime. Further, we found that the static anoxic environment decreased bacterial richness overall, and suppressed the influence of mixing-driven selection relative to the oxic treatment. We then took these fundamental ecological findings at the laboratory-scale, and applied them to field settings in southern Wisconsin under real-world soil mixing mechanisms, evaluating long-term tillage in agricultural soils and earthworm bioturbation in forested soils. With these field experiments, we specifically targeted the effects of disturbance on soil aggregation-which protects soil organic matter and promotes soil carbon persistence-and the bacterial communities that inhabit soil microaggregates. The effects of tillage mirrored those of the lab mixing experiments, resulting in more homogeneous soil bacterial communities, driven by homogenizing dispersal. However, bioturbation and aggregate generation due to the casting activity of non-native earthworms (co-occurring Amynthas tokioensis and A. agrestis) did not consistently impose a strong selective filter on the soil bacterial community. Despite high levels of activity in an otherwise relatively undisturbed forest environment, it does not seem that this earthworm activity necessarily acts to homogenize soil communities via dispersal. Further, we did not identify major distinctions between bacterial communities of the free microaggregate vs. occluded-within-macroaggregate microaggregate fractions in either the agricultural tillage study or the forest earthworm bioturbation study, thus suggesting that soil microaggregates readily shift between these operationally defined fractions, particularly at the end of the agricultural growing season, or in the presence of Amynthas spp. earthworms. With this work, we improve our understanding of the microbial response to soil disturbance, and thus the potential implications of increased soil disturbance under global change.
Download or read book The Soils of Chile written by Manuel Casanova and published by Springer Science & Business Media. This book was released on 2013-01-18 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended for students and soil scientists who want to know about the state of the art in soil sciences in Chile. The book merges a comprehensive bibliographical review of the soil surveys carried out throughout the length and breadth of Chilean territory during the past 40 years and more recent information obtained by the authors in a number of field studies. As its starting point the book presents a general overview of important features related to Chilean soils, such as geology and geomorphology, climate, land use and vegetation. In this long and narrow country different soil formation factors and processes have resulted in a broad variety of soil bodies, from the extremely arid Atacama desert to the Patagonian and Antarctic zones. This book provides a description and classification (mainly Soil Taxonomy) of the most important soil types. Particularly important are soils derived from volcanic materials, which cover extensive areas of Chile. The book also deals with soil management topics in relation to the chemical, physical and biological properties of Chilean soils and it includes a number of examples from throughout the country. Finally, the book shows how man has induced severe soil degradation problems in Chile, such as erosive soil degradation, non-erosive soil degradation and land desertification.
Download or read book Handbook of Plant Nutrition written by Allen V. Barker and published by CRC Press. This book was released on 2016-04-19 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: The burgeoning demand on the world food supply, coupled with concern over the use of chemical fertilizers, has led to an accelerated interest in the practice of precision agriculture. This practice involves the careful control and monitoring of plant nutrition to maximize the rate of growth and yield of crops, as well as their nutritional value.
Download or read book Microbial Environmental Genomics MEG written by Francis Martin and published by Springer Nature. This book was released on 2022-12-15 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume guides researchers on how to characterize, image rare, and hitherto unknown taxa and their interactions, to identify new functions and biomolecules and to understand how environmental changes condition the activity and the response of the organisms living with us and in our environment. Chapters cover different organism types (i.e., archaea, bacteria, fungi, protest, microfauna and microeukaryotes) and propose detailed protocols to produce high quality DNA, to analyse active microbial communities directly involved in complex interactions or processes through stable isotope probing, to identify and characterize of new functional genes, to image in situ interactions and to apply bioinformatics analysis tools to complex metagenomic or RNAseq sequence data. Written in the successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Microbial Environmental Genomics (MEG): Methods and Protocols, Second Edition aims to serve as a primary research reference for researchers in microbiology working to in the expanding field of molecular ecology and environmental genomics.
Download or read book Soil Organic Matter in Sustainable Agriculture written by Fred Magdoff and published by CRC Press. This book was released on 2004-05-27 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recognition of the importance of soil organic matter (SOM) in soil health and quality is a major part of fostering a holistic, preventive approach to agricultural management. Students in agronomy, horticulture, and soil science need a textbook that emphasizes strategies for using SOM management in the prevention of chemical, biological, and physical problems. Soil Organic Matter in Sustainable Agriculture gathers key scientific reviews concerning issues that are critical for successful SOM management. This textbook contains evaluations of the types of organic soil constituents—organisms, fresh residues, and well-decomposed substances. It explores the beneficial effects of organic matter on soil and the various practices that enhance SOM. Chapters include an examination of the results of crop management practices on soil organisms, organic matter gains and losses, the significance of various SOM fractions, and the contributions of fungi and earthworms to soil quality and crop growth. Emphasizing the prevention of imbalances that lead to soil and crop problems, the text also explores the development of soils suppressive to plant diseases and pests, and relates SOM management to the supply of nutrients to crops. This book provides the essential scientific background and poses the challenging questions that students need to better understand SOM and develop improved soil and crop management systems.
Download or read book How to Grow More Vegetables Ninth Edition written by John Jeavons and published by Ten Speed Press. This book was released on 2017-07-25 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world's leading resource on biointensive, sustainable, high-yield organic gardening is thoroughly updated throughout, with new sections on using 12 percent less water and increasing compost power. Long before it was a trend, How to Grow More Vegetables brought backyard ecosystems to life for the home gardener by demonstrating sustainable growing methods for spectacular organic produce on a small but intensive scale. How to Grow More Vegetables has become the go-to reference for food growers at every level, whether home gardeners dedicated to nurturing backyard edibles with minimal water in maximum harmony with nature's cycles, or a small-scale commercial producer interested in optimizing soil fertility and increasing plant productivity. In the ninth edition, author John Jeavons has revised and updated each chapter, including new sections on using less water and increasing compost power.
Download or read book Aboveground Belowground Linkages written by Richard D. Bardgett and published by Oxford University Press. This book was released on 2010-07-29 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aboveground-Belowground Linkages provides the most up-to-date and comprehensive synthesis of recent advances in our understanding of the roles that interactions between aboveground and belowground communities play in regulating the structure and function of terrestrial ecosystems, and their responses to global change. It charts the historical development of this field of ecology and evaluates what can be learned from the recent proliferation of studies on the ecological and biogeochemical significance of aboveground-belowground linkages. The book is structured around four key topics: biotic interactions in the soil; plant community effects; the role of aboveground consumers; and the influence of species gains and losses. A concluding chapter draws together this information and identifies a number of cross-cutting themes, including consideration of aboveground-belowground feedbacks that occur at different spatial and temporal scales, the consequences of these feedbacks for ecosystem processes, and how aboveground-belowground interactions link to human-induced global change.
Download or read book Nitrogen in Agricultural Systems written by James Stuart Schepers and published by ASA-CSSA-SSSA. This book was released on 2008 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: Review of the principles and management implications related to nitrogen in the soil-plant-water system.
Download or read book Soil Survey of Oliver County North Dakota written by Paul K. Weiser and published by . This book was released on 1975 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Linking Restoration and Ecological Succession written by Lawrence R. Walker and published by Springer Science & Business Media. This book was released on 2007-10-16 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: This innovative book integrates practical information from restoration projects around the world with the latest developments in successional theory. It recognizes the critical roles of disturbance ecology, landscape ecology, ecological assembly, invasion biology, ecosystem health, and historical ecology in habitat restoration. It argues that restoration within a successional context will best utilize the lessons from each of these disciplines.
Download or read book Organic Fertilizers written by Marcelo Larramendy and published by BoD – Books on Demand. This book was released on 2016-06-30 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, Organic Fertilizers - From Basic Concepts to Applied Outcomes, is intended to provide an overview of emerging researchable issues related to the use of organic fertilizers that highlight recent research activities in applied organic fertilizers toward a sustainable agriculture and environment. We aimed to compile information from a diversity of sources into a single volume to give some real examples extending the concepts in organic fertilizers that may stimulate new research ideas and trends in the relevant fields.
Download or read book Foundations of Restoration Ecology written by Society for Ecological Restoration International and published by Island Press. This book was released on 2016-11 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Society for Ecological Restoration"--Cover.
Download or read book Soil Conditions and Plant Growth written by Peter J. Gregory and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the extremely successful and popular Russell’s Soil Conditions and Plant Growth, Wiley-Blackwell is pleased to publish this completely revised and updated edition of the soil science classic. Covering all aspects of the interactions between plant and soil, Peter Gregory and Stephen Nortcliff, along with their team of internationally-known and respected authors, provide essential reading for all students and professionals studying and working in agriculture and soil science. Subject areas covered range from crop science and genetics; soil fertility and organic matter; nitrogen and phosphoros cycles and their management; properties and management of plant nutrients; water and the soil physical environment and its management; plants and change processes in soils; management of the soil/plant system; and new challenges including food, energy and water security in a changing environment. Providing a very timely account on how better to understand and manage the many interactions that occur between soils and plants, Soil Conditions and Plant Growth is sure to become the book of choice - as a recommended text for students and as an invaluable reference for those working or entering into the industry. An essential purchase for all universities and research establishments where agricultural, soil, and environmental sciences are studied and taught.
Download or read book The Potential of U S Grazing Lands to Sequester Carbon and Mitigate the Greenhouse Effect written by Ronald F. Follett and published by CRC Press. This book was released on 2000-09-15 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grazing lands represent the largest and most diverse land resource-taking up over half the earth's land surface. The large area grazing land occupies, its diversity of climates and soils, and the potential to improve its use and productivity all contribute to its importance for sequestering C and mitigating the greenhouse effect and other condition
Download or read book O Pioneers written by Willa Cather and published by Modernista. This book was released on 2024-07-15 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: When the young Swedish-descended Alexandra Bergson inherits her father's farm in Nebraska, she must transform the land from a wind-swept prairie landscape into a thriving enterprise. She dedicates herself completely to the land—at the cost of great sacrifices. O Pioneers! [1913] is Willa Cather's great masterpiece about American pioneers, where the land is as important a character as the people who cultivate it. WILLA CATHER [1873-1947] was an American author. After studying at the University of Nebraska, she worked as a teacher and journalist. Cather's novels often focus on settlers in the USA with a particular emphasis on female pioneers. In 1923, she was awarded the Pulitzer Prize for the novel One of Ours, and in 1943, she was elected to the American Academy of Arts and Sciences.
