Revealing The Unforeseen Role And Sensitivity Of Anoxic Protection In Soil Carbon Cycling PDF Download
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Author | : Emily Morgan Lacroix |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : |
ISBN | : |
Download Revealing the Unforeseen Role and Sensitivity of Anoxic Protection in Soil Carbon Cycling Book in PDF, ePub and Kindle
Increasing soil carbon (C) content promises to mitigate climate change and enhance soil fertility. Soil C content is determined, in part, by microbial respiration, which converts soil C into carbon dioxide. Carbon protection mechanisms represent processes and conditions that limit microbial respiration of soil C. Anoxic microsites, zones of oxygen depletion in otherwise oxic soils, are a recently recognized and under-studied soil C protection mechanism. In this dissertation, I use field and laboratory methods to determine the extent and contribution of anoxic microsites to soil C protection within natural and agricultural systems. In Chapter 2, I measure the dissolved oxygen content of soil porewater from California agricultural soils. I show that physical disturbance destroys anoxic microsites through enhancing oxygen supply to the smallest soil pores. In Chapter 3, I show that oxygen limitations constrain OM turnover in a Hawaiian rainforest soil, an environment where mineral content is presumed to be the dominant soil C protection mechanism. In Chapter 4, I examine a soil textural gradient at the Stanford Dish and demonstrate that anoxic microsites are particularly important for protecting C in coarsely textured soils. Finally, in Chapter 5, I use droplet digital PCR to quantify anaerobe DNA (a proxy for anoxic microsites) in soils from four long-term agricultural experiments across the continental United States. I show that anoxic microsites vary with soil properties, respond to management, and uniquely contribute to soil C stabilization within cropland soils. In sum, this dissertation reveals that anoxic microsites represent a vulnerability in the soil C stock but also an opportunity to enhance soil C storage.
Author | : K. Ramesh Reddy |
Publisher | : CRC Press |
Total Pages | : 926 |
Release | : 2022-09-10 |
Genre | : Science |
ISBN | : 0429531931 |
Download Biogeochemistry of Wetlands Book in PDF, ePub and Kindle
The globally important nature of wetland ecosystems has led to their increased protection and restoration as well as their use in engineered systems. Underpinning the beneficial functions of wetlands are a unique suite of physical, chemical, and biological processes that regulate elemental cycling in soils and the water column. This book provides an in-depth coverage of these wetland biogeochemical processes related to the cycling of macroelements including carbon, nitrogen, phosphorus, and sulfur, secondary and trace elements, and toxic organic compounds. In this synthesis, the authors combine more than 100 years of experience studying wetlands and biogeochemistry to look inside the black box of elemental transformations in wetland ecosystems. This new edition is updated throughout to include more topics and provide an integrated view of the coupled nature of biogeochemical cycles in wetland systems. The influence of the elemental cycles is discussed at a range of scales in the context of environmental change including climate, sea level rise, and water quality. Frequent examples of key methods and major case studies are also included to help the reader extend the basic theories for application in their own system. Some of the major topics discussed are: Flooded soil and sediment characteristics Aerobic-anaerobic interfaces Redox chemistry in flooded soil and sediment systems Anaerobic microbial metabolism Plant adaptations to reducing conditions Regulators of organic matter decomposition and accretion Major nutrient sources and sinks Greenhouse gas production and emission Elemental flux processes Remediation of contaminated soils and sediments Coupled C-N-P-S processes Consequences of environmental change in wetlands# The book provides the foundation for a basic understanding of key biogeochemical processes and its applications to solve real world problems. It is detailed, but also assists the reader with box inserts, artfully designed diagrams, and summary tables all supported by numerous current references. This book is an excellent resource for senior undergraduates and graduate students studying ecosystem biogeochemistry with a focus in wetlands and aquatic systems.
Author | : Gerardo M.E. Perillo |
Publisher | : Elsevier |
Total Pages | : 975 |
Release | : 2009-01-18 |
Genre | : Science |
ISBN | : 0080932134 |
Download Coastal Wetlands Book in PDF, ePub and Kindle
Coastal wetlands are under a great deal of pressure from the dual forces of rising sea level and the intervention of human populations both along the estuary and in the river catchment. Direct impacts include the destruction or degradation of wetlands from land reclamation and infrastructures. Indirect impacts derive from the discharge of pollutants, changes in river flows and sediment supplies, land clearing, and dam operations. As sea level rises, coastal wetlands in most areas of the world migrate landward to occupy former uplands. The competition of these lands from human development is intensifying, making the landward migration impossible in many cases. This book provides an understanding of the functioning of coastal ecosystems and the ecological services that they provide, and suggestions for their management. In this book a CD is included containing color figures of wetlands and estuaries in different parts of the world. Includes a CD containing color figures of wetlands and estuaries in different parts of the world.
Author | : William J. Mitsch |
Publisher | : John Wiley & Sons |
Total Pages | : 309 |
Release | : 2009-04-13 |
Genre | : Technology & Engineering |
ISBN | : 047028630X |
Download Wetland Ecosystems Book in PDF, ePub and Kindle
New focused text introduces readers to wetland ecosystems and systems approaches to studying wetlands With its comprehensive coverage of wetland science, management, and restoration, Mitsch and Gosselink's Wetlands has been the premier reference on wetlands for more than two decades. Now, the coverage of specific wetland ecosystem types from earlier editions of this acclaimed work has been updated, revised, and supplemented with additional content in order to create this new text focusing exclusively on wetland ecosystems. This book now complements Wetlands, Fourth Edition. Following an introduction to ecosystems in general and wetland ecosystems in particular, Wetland Ecosystems examines the major types of wetlands found throughout the world: coastal wetlands, freshwater marshes and forested swamps, and peatlands. The final chapter reviews three fundamental systems approaches to studying wetlands: mesocosms, full-scale experimental ecosystems, and mathematical modeling. This new text features: Updated descriptions of the hydrology, biogeochemistry, and biology of the main types of wetlands found in the world New content introducing general ecosystems, wetland ecosystems, whole ecosystem and mesocosm experiments with wetlands, and systems ecology and modeling A detailed description of the ecosystem services provided by wetlands A broad international scope, including many examples of wetlands located outside North America Two new coauthors offering new perspectives and additional insights into the latest ecosystem and modeling techniques An abundance of illustrations helps readers understand how different biological communities and the abiotic environment in wetland ecosystems interact and function. Tables and text boxes provide at-a-glance summaries of key information. Lastly, each chapter concludes with a list of recommended readings. This text has been designed as an introduction for students and professionals in wetland ecology and management, general ecology, environmental science, and natural resource management.
Author | : C. Nellemann |
Publisher | : UNEP/Earthprint |
Total Pages | : 80 |
Release | : 2009 |
Genre | : Law |
ISBN | : 9788277010601 |
Download Blue Carbon Book in PDF, ePub and Kindle
This report explores the potential for mitigating the impacts of climate change by improved management and protection of marine ecosystems and especially the vegetated coastal habitat, or blue carbon sinks. The objective of this report is to highlight the critical role of the oceans and ocean ecosystems in maintaining our climate and in assisting policy makers to mainstream an oceans agenda into national and international climate change initiatives. While emissions' reductions are currently at the centre of the climate change discussions, the critical role of the oceans and ocean ecosystems has been vastly overlooked.
Author | : Stefan Geisen |
Publisher | : Sudwestdeutscher Verlag Fur Hochschulschriften AG |
Total Pages | : 328 |
Release | : 2015-10-13 |
Genre | : |
ISBN | : 9783838151571 |
Download Soil Protists Book in PDF, ePub and Kindle
Protists are by far the most diverse and abundant eukaryotes in soils. Nevertheless, very little is known about individual representatives, the diversity and community composition and ecological functioning of these important organisms. For instance, soil protists are commonly lumped into a single functional unit, i.e. bacterivores. This work tackles missing knowledge gaps on soil protists and common misconceptions using multi-methodological approaches including cultivation, microcosm experiments and environmental sequencing. In a first part, several new species and genera of amoeboid protists are described showing their immense unknown diversity. In the second part, the enormous complexity of soil protists communities is highlighted using cultivation- and sequence-based approaches. In the third part, the present of diverse mycophagous and nematophagous protists are shown in functional studies on cultivated taxa and their environmental importance supported by sequence-based approaches. This work is just a start for a promising future of soil Protistology that is likely to find other important roles of these diverse organisms.
Author | : National Research Council |
Publisher | : National Academies Press |
Total Pages | : 398 |
Release | : 2001-05-21 |
Genre | : Science |
ISBN | : 0309170990 |
Download Conceptual Models of Flow and Transport in the Fractured Vadose Zone Book in PDF, ePub and Kindle
Fluid flow and solute transport within the vadose zone, the unsaturated zone between the land surface and the water table, can be the cause of expanded plumes arising from localized contaminant sources. An understanding of vadose zone processes is, therefore, an essential prerequisite for cost-effective contaminant remediation efforts. In addition, because such features are potential avenues for rapid transport of chemicals from contamination sources to the water table, the presence of fractures and other channel-like openings in the vadose zone poses a particularly significant problem, Conceptual Models of Flow and Transport in the Fractured Vadose Zone is based on the work of a panel established under the auspices of the U.S. National Committee for Rock Mechanics. It emphasizes the importance of conceptual models and goes on to review the conceptual model development, testing, and refinement processes. The book examines fluid flow and transport mechanisms, noting the difficulty of modeling solute transport, and identifies geochemical and environmental tracer data as important components of the modeling process. Finally, the book recommends several areas for continued research.
Author | : |
Publisher | : |
Total Pages | : 264 |
Release | : 2011 |
Genre | : Marine pollution |
ISBN | : |
Download Guide to Best Practices for Ocean Acidification Research and Data Reporting Book in PDF, ePub and Kindle
Author | : Sebastian B. Scholz |
Publisher | : World Bank Publications |
Total Pages | : 231 |
Release | : 2014-06-23 |
Genre | : Business & Economics |
ISBN | : 0821395262 |
Download Biochar Systems for Smallholders in Developing Countries Book in PDF, ePub and Kindle
This report offers a review of what is known about opportunities and risks of biochar systems in developing countries. Its aim is to fill in critical knowledge gaps between the biochar research community and development practicioners on the ground.
Author | : Groupe d'experts intergouvernemental sur l'évolution du climat |
Publisher | : |
Total Pages | : 151 |
Release | : 2015 |
Genre | : |
ISBN | : 9789291691432 |
Download Climate Change 2014 Book in PDF, ePub and Kindle