Download or read book The Role of Labile Carbon and Its Interaction with Humus Form in Controlling Forest Soil Nitrogen Cycling written by Robert Lionel Bradley and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The flux of soil C is linked to soil nutrient cycling and plant uptake but the exact nature of these relationships is unclear. Interactions between labile-C and humus form in controlling microbial and nutrient dynamics were studied. A new kinetic parameter was derived to reliably assess the potential energy supply to soil microbes. A bioassay study demonstrated that the rhizosphere of paper birch (Betula papyrifera Marsh.) seedlings increased soil available-C and microbial biomass but decreased microbial nutrient limitation; results suggest an alternative conceptual model for N cycling termed "co-metabolic N mineralization". Go-metabolic N mineralization occurred in a mull but not in a mor humus, probably as the result of changes in microbial community structure following the introduction of roots into microsites dominated by ligninolytic organisms. [...]" --

Download or read book Expert Committee on Weeds Proceedings of the 1996 National Meeting written by P. G. Comeau and published by . This book was released on 1997 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings contains submitted written summaries of presentations and discussions at a meeting of an expert committee on weed science and weed problem management. Topics of presentations included integrated weed management, weed-crop competition models, environmental impacts of herbicides, herbicide resistance in weeds, crop yield loss prediction models, biology and control of dandelion, formulation of biological control products, weed biology and ecology, decision support systems for weed control, bioassay, forestry herbicide use, and weed invasiveness mechanisms.

Download or read book Carbon and Nitrogen Cycling in Soil written by Rahul Datta and published by Springer Nature. This book was released on 2019-08-24 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several textbooks and edited volumes are currently available on general soil fertility but‚ to date‚ none have been dedicated to the study of “Sustainable Carbon and Nitrogen Cycling in Soil.” Yet this aspect is extremely important, considering the fact that the soil, as the ‘epidermis of the Earth’ (geodermis)‚ is a major component of the terrestrial biosphere. This book addresses virtually every aspect of C and N cycling, including: general concepts on the diversity of microorganisms and management practices for soil, the function of soil’s structure-function-ecosystem, the evolving role of C and N, cutting-edge methods used in soil microbial ecological studies, rhizosphere microflora, the role of organic matter (OM) in agricultural productivity, C and N transformation in soil, biological nitrogen fixation (BNF) and its genetics, plant-growth-promoting rhizobacteria (PGPRs), PGPRs and their role in sustainable agriculture, organic agriculture, etc. The book’s main objectives are: (1) to explain in detail the role of C and N cycling in sustaining agricultural productivity and its importance to sustainable soil management; (2) to show readers how to restore soil health with C and N; and (3) to help them understand the matching of C and N cycling rules from a climatic perspective. Given its scope, the book offers a valuable resource for educators, researchers, and policymakers, as well as undergraduate and graduate students of soil science, soil microbiology, agronomy, ecology, and the environmental sciences. Gathering cutting-edge contributions from internationally respected researchers, it offers authoritative content on a broad range of topics, which is supplemented by a wealth of data, tables, figures, and photographs. Moreover, it provides a roadmap for sustainable approaches to food and nutritional security, and to soil sustainability in agricultural systems, based on C and N cycling in soil systems.

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 Carbon Nitrogen and Phosphorus Cycling in Forest Soils written by Robert G. Qualls and published by MDPI. This book was released on 2019-06-21 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: The majority of carbon stored in the soils of the world is stored in forests. The refractory nature of some portions of forest soil organic matter also provides the slow, gradual release of organic nitrogen and phosphorus to sustain long term forest productivity. Contemporary and future disturbances, such as climatic warming, deforestation, short rotation sylviculture, the invasion of exotic species, and fire, all place strains on the integrity of this homeostatic system of C, N, and P cycling. On the other hand, the CO2 fertilization effect may partially offset losses of soil organic matter, but many have questioned the ability of N and P stocks to sustain the CO2 fertilization effect. Despite many advances in the understanding of C, N, and P cycling in forest soils, many questions remain. For example, no complete inventory of the myriad structural formulae of soil organic N and P has ever been made. The factors that cause the resistance of soil organic matter to mineralization are still hotly debated. Is it possible to “engineer” forest soil organic matter so that it sequesters even more C? The role of microbial species diversity in forest C, N, and P cycling is poorly understood. The difficulty in measuring the contribution of roots to soil organic C, N, and P makes its contribution uncertain. Finally, global differences in climate, soils, and species make the extrapolation of any one important study difficult to extrapolate to forest soils worldwide.

Download or read book Plant Soil Interactions under Changing Climate written by Sanna Sevanto and published by Frontiers Media SA. This book was released on 2021-02-04 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cycling of Carbon Nitrogen Sulfur and Phosphorus in Terrestrial and Aquatic Ecosystems written by J. R. Freney and published by Springer. This book was released on 2011-11-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing stress is being placed on the environment by man's activities including those of changing land usage for increased food production and the release of carbon dioxide due to fossil fuel combustion. Further stresses may occur if agricultural practice is modified by using plant products for liquid fuels. Rational management of these activities can only occur if there is a thorough under standing of the biogeochemical cycles of the major plant nutrients, carbon, nitrogen, sulfur and phosphorus. A vital part of this understanding concerns the interactions between these cycles, where in various limiting processes the cycle of one element exerts a controlling influence over the cycle of one or more of the other elements. A well known example of this interaction is the role of sulfur, nitrogen and phosphorus as limiting factors in plant growth i.e. carbon uptake by the biosphere. A related effect is the suggested increase in nitrogen fixation by legumes due to CO2 enrichment in the atmosphere. Other interactions occur during the mineralisation of nitrogen, sulfur and phosphorus associated with the release of organic carbon during the decay of plant material and between the carbon substrate and mineral forms of nitrogen and sulfur during denitrification and bacterial sulfate reduction. Increased sulfur dioxide and nitrogen oxide emissions to the atmosphere in some areas are causing acid rain which appears to be affecting the productivity of some land and aquatic ecosystems.

Download or read book Effects of Chronic Nitrogen Additions on Carbon and Nitrogen Cycling in Two Tropical Forests written by Daniela Francis Cusack and published by . This book was released on 2009 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Litter Decomposition a Guide to Carbon and Nutrient Turnover written by and published by Academic Press. This book was released on 2005-11-22 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Litter Decomposition describes one of the most important processes in the biosphere - the decay of organic matter. It focuses on the decomposition process of foliar litter in the terrestrial systems of boreal and temperate forests due to the greater amount of data from those biomes. The availability of several long-term studies from these forest types allows a more in-depth approach to the later stages of decomposition and humus formation. Differences between the decay of woody matter and foliar litter is discussed in detail and a different pattern for decomposition is introduced. While teachers and students in more general subjects will find the most basic information on decomposition processes in this book, scientists and graduate students working on decomposition processes will be entirely satisfied with the more detailed information and the overview of the latest publications on the topic as well as the methodological chapter where practical information on methods useful in decomposition studies can be found. Abundant data sets will serve as an excellent aid in teaching process and will be also of interest to researchers specializing in this field as no thorough database exists at the moment. Provides over 60 tables and 90 figures Offers a conceptual 3-step model describing the different steps of the decomposition process, demonstrating changes in the organic-chemical structure and nutrient contents Includes a synthesis of the current state of knowledge on foliar litter decomposition in natural systems Integrates more traditional knowledge on organic matter decomposition with current problems of environmental pollution, global change, etc. Details contemporary knowledge on organic matter decomposition

Download or read book Soil Organic Matter written by M. M. Kononova and published by Elsevier. This book was released on 2013-10-02 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil Organic Matter: Its Nature, Its Role in Soil Formation and in Soil Fertility focuses on the contributions of soil organic matter in soil formation and fertility, including weathering, decomposition, and synthesis of humus substances. The publication first elaborates on the main stages in the history of soil humus study and ideas on the composition of soil organic matter and nature of humus substances. Discussions focus on organic substances of individual nature, strictly humus substances in soil organic matter, and humus substances as a complex of high molecular- weight compounds. The text then examines the biochemistry of humus formation, including the role of physical, chemical, and biological factors, origin of humus substances, possible participation of lignin in the formation of humus substances, and the role of oxidizing enzymes in the synthesis of humus substances. The manuscript takes a look at the importance of organic matter in soil formation and soil fertility and the natural factors of humus formation. Topics include the role of organic matter in the weathering and decomposition of soil minerals; role of organic matter in the formation of soil structure; effect of organic matter on the growth and development of plants; and influence of chemical and physicochemical soil properties on humus formation. The publication is a dependable source material for readers interested in the influence of soil organic matter in soil formation and fertility.

Download or read book Linking Carbon and Nitrogen Cycling to Plant soil microbial Interactions at the Field Soil Pedon and Micro scales Within Long term Conventional Low input and Organic Cropping Systems written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the greatly increased productive capacity of current-day cropping systems, the shortcomings associated with conventional, high-intensity cropping systems and the growing threat of global climate change, warrant the identification of crop management practices that promote long-term agricultural sustainability and productivity. Unlike conventional cropping practices, which include synthetic nitrogen and pesticide use, alternative crop management practices, e.g., cover cropping, tillage reduction, organic amendment additions, and reducing or eliminating synthetic fertilizer use, have emerged as integrated and ecologically sound approaches to enhance agroecosystem functioning and services. Yet, mechanisms governing the differences in soil quality and crop yields among alternative cropping systems and conventional systems remain unclear. The aim of this dissertation study was to understand and quantify the mechanisms governing the relationship between carbon and nitrogen cycling and the interactions between plants, soil, and microorganisms within long-term conventional (annual synthetic fertilizer), low-input (alternating synthetic fertilizer and cover crop additions), and organic (annual manure- and cover crop additions) cropping systems, at the field-, soil pedon-, and micro-scales. A multi-scaled approach, including agronomic experiments, stable isotopes (13C and 15N), soil fractionation techniques, and microbiological analyses (e.g., functional gene quantification and phospholipid fatty acid assays), was employed to study mechanisms of soil carbon and nitrogen stabilization and loss and to draw links between microbial populations and carbon and nitrogen processing across different agroecosystems. Data from this research only partly corroborated the global hypothesis: the effects of long-term, low-input crop management enhance microbial-mediated carbon and nitrogen turnover in different soil microenvironments and optimize the balance between carbon and nitrogen stabilization and loss compared to the conventional and organic cropping systems. Only a weak relationship between short-term microbial community structure and long-term carbon and nitrogen sequestration was found across the three cropping systems. The conclusion drawn is that the effects of long-term crop management are dictated by complex trade-offs between soil carbon and nitrogen stabilization, microbial abundance and activity, nitrogen losses, crop productivity, and the quantity and quality of carbon and nitrogen inputs in alternative cropping systems.

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 Forest and Rangeland Soils of the United States Under Changing Conditions written by Richard V. Pouyat and published by Springer Nature. This book was released on 2020-09-02 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book synthesizes leading-edge science and management information about forest and rangeland soils of the United States. It offers ways to better understand changing conditions and their impacts on soils, and explores directions that positively affect the future of forest and rangeland soil health. This book outlines soil processes and identifies the research needed to manage forest and rangeland soils in the United States. Chapters give an overview of the state of forest and rangeland soils research in the Nation, including multi-decadal programs (chapter 1), then summarizes various human-caused and natural impacts and their effects on soil carbon, hydrology, biogeochemistry, and biological diversity (chapters 2–5). Other chapters look at the effects of changing conditions on forest soils in wetland and urban settings (chapters 6–7). Impacts include: climate change, severe wildfires, invasive species, pests and diseases, pollution, and land use change. Chapter 8 considers approaches to maintaining or regaining forest and rangeland soil health in the face of these varied impacts. Mapping, monitoring, and data sharing are discussed in chapter 9 as ways to leverage scientific and human resources to address soil health at scales from the landscape to the individual parcel (monitoring networks, data sharing Web sites, and educational soils-centered programs are tabulated in appendix B). Chapter 10 highlights opportunities for deepening our understanding of soils and for sustaining long-term ecosystem health and appendix C summarizes research needs. Nine regional summaries (appendix A) offer a more detailed look at forest and rangeland soils in the United States and its Affiliates.

Download or read book Carbon Nitrogen and Phosphorus Cycling in Forest Soils written by Robert G. Qualls and published by . This book was released on 2019 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: The majority of carbon stored in the soils of the world is stored in forests. The refractory nature of some portions of forest soil organic matter also provides the slow, gradual release of organic nitrogen and phosphorus to sustain long term forest productivity. Contemporary and future disturbances, such as climatic warming, deforestation, short rotation sylviculture, the invasion of exotic species, and fire, all place strains on the integrity of this homeostatic system of C, N, and P cycling. On the other hand, the CO2 fertilization effect may partially offset losses of soil organic matter, but many have questioned the ability of N and P stocks to sustain the CO2 fertilization effect.

Download or read book The Bamboos of the World written by D. Ohrnberger and published by Elsevier. This book was released on 1999-01-29 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bamboos constitute one of a few select categories of plants which are taxonomically related, very rich in species and of vital economic and ecological importance. Since the early 20th century the accepted number of species of bamboos, world wide, has tripled. However, until now information was scattered through numerous, often not easily available publications. The Bamboos of the World, is the first comprehensive (taxonomic as well as horticultural) reference work that provides basic information on bamboos world wide, whether they are wild or cultivated, well-known or rather unknown. The work, based on bamboo literature, facilitates access to further data by citation and a comprehensive bibliography. Among the main data included are botanical names with synonyms, and geographical distribution of genera and species, varieties with their distinctive characters, common bamboo names, plant introductions to the West, plant size and uses. The distribution of genera is mapped. The Bamboos of the World presents a wealth of essential information in an accessible and structured manner. It gives the opportunity to check under what names, and where, relevant information on any bamboo can be found. For the researcher with management and development interests it provides a convenient means of basing bamboo resource on a sound understanding of generic and species relationships, with names that appear in earlier literature put into context. The work should prove to be invaluable for those interested in the morphology, taxonomy, distribution and cultivation of bamboos. It should support botanical, forestry, horticultural and ecological research, training and resource management.

Download or read book Influences of Nitrogen on Carbon Dynamics in Forest Soil and Density Fractions written by Christopher W. Swanston and published by . This book was released on 2000 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application of N fertilizer is a common forest management practice in the Pacific Northwest, yet the long-term influence of fertilization on forest soil properties is not well known. Although elevated N often increases mineralization of C and N from labile organic matter, negative effects have been documented in recalcitrant organic matter and whole soil. Using a series of paired plots in which one of each pair had undergone long-term N fertilization, I investigated the effects of elevated N on C and N mineralization in forest soils and organic fractions. The O2 horizons (O2), whole soils (WS), light fractions (LF), heavy fractions (HF), and physically recombined fractions (RF), from the paired plots were incubated in the laboratory for 300 d. For control soils, an additional "summed" fraction (SF), was computed from LF and HF results. Prior to analysis of the effects of elevated N, a general test of the density fractionation technique was conducted in the control soils. The LF and HF were hypothesized to represent labile and recalcitrant fractions in soil, but C and N were not substantially more stable in the HF during the incubation. Total cumulative respiration and N mineralization were similar for both the SF and the WS, but C and N mineralization in both fractions were higher than in the RF. The depressed respiration in the RF might be explained by an antagonistic interaction between the varied microbial communities that degrade LF and HF; in the heterogeneous WS, these communities may be spatially separated. The density separation technique appears to be a viable method for isolating and studying different soil fractions, but these fractions should be considered more carefully in the context of microbial interaction and soil spatial heterogeneity. Elevated N depressed cumulative respiration to a similar extent in all substrates. The mechanisms most involved in degrading these substrates are negatively affected by elevated N, but may not be the same in each substrate. While laboratory results may not withstand the variability of the natural environment, the potential for elevated N to stabilize C in soil suggests the need for more detailed field measurements.

Download or read book The Future of Soil Carbon written by Carlos Garcia and published by Academic Press. This book was released on 2018-04-10 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Future of Soil Carbon: Its Conservation and Formation provides readers with an integrative approach to understanding the important role of organic carbon in soil functioning and fertility. Terrestrial interactions between SOC and complex human-natural systems require new fundamental and applied research into regional and global SOC budgets. This book provides new and synthesized information on the dynamics of SOC in the terrestrial environment. In addition to rigorous state-of-the art on soil science, the book also provides strategies to avoid risks of soil carbon losses. Soil organic carbon (SOC) is a vital component of soils, with important and far-reaching effects on the functioning of terrestrial ecosystems. Human activities over the last several decades have significantly changed the regional and global balance of SOC, greatly exacerbating global warming and climate change. Provides a holistic overview of soil carbon status and main threats for its conservation Offers innovative solutions to conserve soil carbon Includes in-depth treatment of regional and global changes in soil organic carbon budget