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  • 1
    Keywords: Forests and forestry -- Social aspects. ; Forests and forestry -- Environmental aspects. ; Sustainable forestry. ; Electronic books.
    Description / Table of Contents: This book provides a broad-ranging textbook on the relationships between forests and society. It discusses the ways in which society can interact with forest landscapes without adversely affecting their sustainability. Topics covered include attitudes to, and uses of forests, the creation of today's forest landscapes, the impact of humans on forests, and forest sustainability and human health. The book also examines emerging issues in forestry such as possible solutions to balancing societies' needs with forest sustainability, managing forests in the urban-wildland interface, and the impact of illegal logging. It is packed with real-world case studies from the USA, Australia, Bolivia, Botswana, Canada, China, Iceland, India, Indonesia, Kenya, Mexico, Nepal, Peru, Philippines, Puerto Rico, and Thailand.
    Type of Medium: Online Resource
    Pages: 1 online resource (355 pages)
    Edition: 1st ed.
    ISBN: 9781845931117
    DDC: 333.75
    Language: English
    Note: Intro -- Contents -- Contributing Authors -- Foreword -- Introduction -- 1. Historical Perceptions and Uses of Forests -- The History of Reverence for the Forest -- The History of Fear and the Forest -- History of Forest Exploitation -- Forests and the formation of early civilizations -- European colonization and industrialization period (1200-1700 CE) -- Wooden Ships, Colonization and Controlling Access to Wood -- The Period of Forest Loss and Exploitation in North America (1770-1960 CE) -- Conservation and Regulations of Forest Uses -- Ancient civilizations (2500 BCE-700 CE) -- The Middle Ages and monks in Europe begin active forest management (500-1500 CE) -- The Portuguese audit forest uses: the roots of forest certification (1200-1300 CE) -- France becomes a dominant sea and economic power in Europe: building a navy while vigilant over forests (1665-1683 CE) -- French introduce scientific knowledge into forest reserves to reduce soil erosion (early to late 1700s CE) -- Forestry becomes a systematic science and a profession: links among German forestry, sustainable teak management in India, university training of professional foresters and the United States conservation movement (1850-mid 1900s CE) -- The maturation of models to conserve forests (1850-1900 CE) -- The role of the United States government in forestry (1900 CE to present) -- Search for Forest Resources and Scarcity after Over-exploitation at Regional Scales -- Global Scarcity Acknowledged in the Twentieth Century but also the Need for Verification of Sustainable Management of Forests -- A Trend towards More Intensive Management and Planting of Exotic Species in Commercially Managed Forests -- Case 1.1. A History of Forest Protected Areas -- 2. Global Societies and Forest Legacies Creating Today's Forest Landscapes -- Human Uses of Terrestrial Global Systems. , Characteristics of Forest Biomes Determined their Utility for Human Survival in the Past -- Where are Forests in the World Today? -- Current Global Consumptive Uses of Forest Materials -- Fuel wood -- Paper products -- Industrial round wood -- What is the Current Capacity for Sustainable Production of Goods and Services from Forests, Given Past Human Uses? -- Forest Supply Capacity Increases by Linking Forests to Energy Production -- Case 2.1. Nepal, Community Forests and Rural Sustainability -- Case 2.2. The Impact of Indigenous People on Oak-Pine Forests of the Central Himalaya -- Case 2.3. Dead-wood Politics: Fuel Wood, Forests and Society in the Machu Picchu Historic Sanctuary -- Case 2.4. Icelanders and their Forest History: a Thousand-year-old Human and Nature History Controlling Resilience and Species Composition in Forests Today -- 3. Human Dimensions of Forests: Democratization and Globalization of Forest Uses -- Introduction -- The Definition of Best Management Practices Changes as Public Values Change -- Democratization of Forest Management and Uses: a Phenomenon in Industrialized Countries -- Democratization of decision-making in forests: the United States example -- The rise of environmentalism and conservation contributing to the democratization of forest uses -- Globalization of Forest Management and Uses -- Ecological Constraints on Society Dependent on Survival from Resource Extraction from Forests -- The ecological constraints of the tropics for humans -- International perceptions: a product of fallacies and misunderstanding of tropical forests -- Solutions introduced by international organizations for the tropics -- Forest products uses in the tropics: are they sustainable? -- Case 3.1. Debt-for-nature Swaps, Forest Conservation and the Bolivian Landscape. , Case 3.2. Cattle, Wildlife and Fences: Natural Disaster and Man-made Conflict in Northern Botswana -- Case 3.3. Forest Communities in China and Thailand -- Case 3.4. Indian Forest: Land in Trust -- Case 3.5. Forest Management and Indigenous Peoples in Western Canada -- 4. Ecology and Conservation of Forests -- Introduction: the Interconnectivities of Forest Ecosystems -- One Tree is Not Just Like the Next Tree in an Ecosystem: Terminology, Taxonomy and Regeneration Trade-offs -- The terminology and taxonomy of trees -- The trade-offs of being a gymnosperm or an angiosperm -- Key Processes that Interconnect Organisms in Forest Ecosystems -- Plants capturing carbon from the atmosphere -- Minerals and water interconnect different organisms in an ecosystem -- Intra- and interspecific interactions -- Environmental Change and Succession -- Why we should care about climate change -- Natural ecosystem dynamics: succession in forests -- Biodiversity: the Glue that Holds Ecosystems Together -- What is biodiversity? -- Why is biodiversity relevant? -- Challenges in conserving biodiversity -- Case 4.1. Mycorrhizal Symbioses in Forest Ecosystems: the Ties that Bind -- Case 4.2. Small Mammals and their Relationship to Forests in the Pacific North-west United States -- Case 4.3. Puerto Rico and Hawaii: the Dilemma of Coqui Frog Conservation or Eradication in Wet Tropical Forests -- Case 4.4. Malaria and Land Modifications in the Kenyan Highlands -- Case 4.5. Salmon: Fish of the Forest -- 5. Human and Natural Disturbances Impacting Forests -- Introduction -- Recognition that Natural Disturbances Need to Occur -- Forest Health -- Forest Declines -- Forest Disturbance Agents -- Natural disturbance agents -- Human disturbance agents -- Influence of Disturbance Agents on Forests -- Influence of fire and wind: a United States example. , The influence of introduced plants, pathogens and insects on forest health -- The influence of air pollution on forest health -- Effects of acid precipitation -- Influence of wars -- Disturbances in Forests and Human Health -- Specific environmental factors causing spread of contagious diseases -- Case 5.1. Kudzu -- Case 5.2. Acid Rain, Air Pollution and Forest Decline -- Case 5.3. Wildfire in the Boreal Forests of Alaska -- Case 5.4. Habitat Fragmentation and Disease Ecology: the Case of Lyme Disease -- 6. Forests and the Carbon Cycle -- Introduction -- Carbon Cycle -- The carbon cycle interconnects global processes -- Carbon pools in the global carbon cycle -- Forests as Interconnectors of the Carbon Cycle -- Trees as carbon interconnectors in ecosystems -- Forest age, tree species and carbon sequestration -- Why carbon accumulates in the soil -- Today managing the carbon storage pools in vegetation and soils is insufficient to allow forests to provide services and goods for society -- The Importance of Managing the Carbon Cycle and Mitigating Climate Change by Managing Plant Chemistry -- Tissue components: complex carbon compounds used in structure and function -- Decomposition (and composting): converting complex carbon compounds into their molecular forms -- Natural Patterns of Storing and Cycling of Carbon by Forest Soils and Vegetation -- Natural patterns of carbon storage by forest climatic types -- Natural patterns of carbon storage capacity in soils -- The Altered Carbon Cycle due to Global Climate Change and the Connection to Forests -- How can Society Manage Carbon in Forests? -- Fossil-fuel combustion significant source of atmospheric carbon emissions and why climate-friendly forestry has a strong future -- New role for forest materials to produce energy and chemical commodities -- Global Management of Carbon. , UNFCCC and the Kyoto Protocol -- Case 6.1. Measuring Carbon in Forests Using High-resolution Digital Imagery -- Case 6.2. Carbon Sequestration in a Boreal Forest in Iceland: Effects of Native and Exotic Species -- 7. Emerging Issues in Forests -- Continuing Challenge for Sustainability: Linking the Social and Natural Sciences and Codifying Indicators -- Developing a natural and social science for sustainable management of forests -- Understanding sustainable forestry as a natural science -- Indicators of sustainable forestry -- Start of forest certification: difficulty of codifying acceptable indicators of sustainability that integrate the social and natural sciences -- A Challenge: Codification and Consensus in Measuring Sustainable Forestry -- Sustainable livelihoods dissociated from sustainable management -- What do communities in the industrialized and developing countries want from certification? -- Issues still confronting forest certification today -- A New Challenge to Sustainable Forestry: Managing Urban Forests and Reducing Deforestation at the Urban-Wild-land Interface -- Another New Challenge to Sustainable Forestry: Illegal Timber Harvesting -- A Solution for Sustainable Forestry: Manage Biomass Wastes to Produce Energy Sustainably -- Biomass wastes: trash in industrialized countries but income in many developing countries -- Biomass wastes - a disposal problem -- Is there enough biomass available to produce new products? -- Products possible from biomass -- New products from forest biomass that are climate-friendly technologies -- A Solution for the Future: Integrating Lessons Learned in Conservation and Sustainable Forestry -- Conservation literature calls for evaluations and improved accountability -- Linking conservation and resource uses not a global trend and sustainable forestry not being practised where needed. , Case 7.1. Restoration of Degraded Rainforest Sites in the Wet Tropics of North-east Australia.
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  • 2
    Online Resource
    Online Resource
    Berlin/Boston :Walter de Gruyter GmbH,
    Keywords: Forest ecology. ; Forest type groups. ; Forest plants. ; Forest soils. ; Soils -- Organic compound content. ; Plant communities. ; Electronic books.
    Description / Table of Contents: Ecosystem Science is a highly interdisciplinary field of global significance. This series - copublished by Higher Education Press (HEP) and De Gruyter Publishers - is devoted to prominent topics in the fundamentals of ecosystem science and its application. The series is targeted to an international audience of scientists and practitioners, while maintaining a strong emphasis on reaching scholars and the general public in China. This will be accomplished by publishing all ESA books in both English and Chinese.
    Type of Medium: Online Resource
    Pages: 1 online resource (242 pages)
    Edition: 1st ed.
    ISBN: 9783110290479
    Series Statement: Ecosystem Science and Applications Series
    DDC: 577.3
    Language: English
    Note: Intro -- Acknowledgments -- Acronyms -- Contents -- Part I Context of Soil and Plant Analysis -- 1 Overview of Soil and Plant Analysis for Forest Ecosystems -- 1.1 Soils are Physically, Chemically and Biologically Complex -- Part II Introductory Methods in Soil and Plant Analyses -- 2 Field Characterization of Soils to Establish Sampling Protocols -- 2.1 Soil Sampling Design and Methods -- 2.1.1 Introduction to Sampling Design -- 2.1.1.1 Accuracy, Bias, and Precision -- 2.1.1.2 General Considerations on Soil Sampling -- 2.1.1.3 Common Sampling Tools and Techniques -- 2.1.1.4 Soil Sample Preparation -- 2.1.2 Soil Sample Process Procedure -- 2.1.2.1 Sample Variability-Number of Samples Required -- 3 Plant Tissue Characterization -- 3.1 Tissue Sampling -- 3.2 Tissue Preparation and Laboratory Extraction -- 4 Introduction: Laboratory Practices -- 4.1 General Laboratory Protocol -- 4.1.1 Safety -- 4.1.2 Laboratory Water -- 4.1.3 Clean-up -- 4.1.4 Waste Disposal -- Part III Soil Physical, Chemical and Biological Analyses -- 5 Methods for Analyzing Soil Physical Characteristics -- 5.1 Soil Moisture -- 5.1.1 Direct Methods of Estimating Soil Moisture and Soil Water Potential -- 5.1.2 Procedure to Determine Gravimetric Water Concentrations -- 5.2 Soil Bulk Density -- 5.2.1 Soil Bulk Density Methods -- 5.3 Soil Texture (Particle Size Analysis or Mechanical Analysis) -- 5.3.1 Soil Texture Methods -- 5.3.1.1 Soil Texture Procedure: Bouyoucos Hydrometer Method -- 5.4 Soil Water Potential -- 5.4.1 Pressure Plate Apparatus Procedure: SoilMoisture Release Curve -- 6 Soil Chemical Characterization -- 6.1 Soil pH -- 6.1.1 Measuring pH -- 6.1.2 The Care of pH Electrodes -- 6.2 Electrical Conductivity (EC) -- 6.2.1 Saturated Paste Extract Procedure: Electrical Conductivity -- 6.3 Ion Exchange in Soils -- 6.3.1 Cation Exchange Capacity -- 6.3.2 Exchangeable Cations. , 6.3.3 Extraction Procedures for Exchangeable Cations and Cation Exchange Capacity -- 6.4 Exchangeable Soil Acidity -- 6.4.1 Extraction Procedures for Exchangeable Soil Acidity -- 6.4.1.1 Exchangeable Acidity (Barium Chloride-Triethanolamine Method) -- 6.4.1.2 Exchangeable Acidity (Potassium Chloride Method) -- 6.5 Extractable Inorganic Soil Nitrogen -- 6.5.1 Extraction Methods for Inorganic Soil Nitrogen -- 6.5.1.1 Single Extraction Procedure: Extractable Inorganic Nitrogen -- 6.5.1.2 Double Extraction Procedure: Mechanical Vacuum Extractor -- 6.6 Soil Phosphorus -- 6.6.1 Methodology for Measuring Soil Phosphorus -- 6.6.2 Procedure: Extractable Inorganic Phosphorus -- 6.7 Soil Carbon and Organic Matter -- 6.7.1 Dry Combustion Procedure: Total Soil Carbon and Nitrogen -- 6.7.2 Loss on Ignition (LOI) Procedure: Total Soil Organic Matter -- 6.7.3 Walkley-Black Procedure: Soil Carbon -- 6.8 Selective Dissolution of Iron and Aluminum -- 6.8.1 Extraction Procedure: Organically Complexed Iron and Aluminum -- 6.8.2 Extraction Procedure: Non-crystalline Soil Iron and Aluminum Oxides -- 7 Total Plant and Soil Nutrient Analysis (Digestion) -- 7.1 Wet Oxidation Method -- 7.2 Dry Oxidation Method -- 7.3 Total Dissolved Carbon and Nitrogen in Water -- 7.4 Modified Kjeldahl Digest Procedure: Sulfuric Acid Digest for "Total" Nutrients -- 7.5 "Total" Nutrient Analysis Procedure: Dry Ashing Followed by Nitric Acid Digest -- 7.6 Total Dissolved Nitrogen in Water Procedure: Persulfate Oxidation -- 8 Soil Biology Characterization -- 8.1 Soil Microbes -- 8.1.1 Archaea and Bacteria -- 8.1.2 Fungi -- 8.1.3 Soil Algae and Cyanobacteria (Blue-green Algae) -- 8.2 Methods for Determining Soil Microbial Diversity and Populations-Numbers and Biomass -- 8.2.1 Direct Culture, Microscopy and Image Analysis -- 8.2.2 Microbial Numbers and Microbial Biomass -- 8.3 Mycorrhizas. , 8.3.1 Types of Mycorrhizas -- 8.3.2 Sampling Mycorrhizas -- 8.3.2.1 Sampling Design -- 8.3.2.2 Collection of Root and Soil Samples -- 8.3.2.3 Storage of Samples -- 8.3.2.4 Determining Mycorrhizas in Samples -- 8.3.3 Determination of Mycorrhizal Fungal Species -- 8.3.3.1 Analysis of Sporocarps and Spores -- 8.3.3.2 Morphotypes of Ectomycorrhizas -- 8.3.3.3 Trap Cultures for Arbuscular Mycorrhizal Fungi -- 8.3.3.4 DNA and Biochemical Techniques -- 8.3.4 Ectomycorrhizal Quantification -- 8.3.5 Identification of Ectomycorrhizal Sporocarps -- 8.3.6 Quantification of Arbuscular Mycorrhizal Colonization -- 8.3.6.1 Staining -- 8.3.6.2 Grid-line Intersection Method with a Dissecting Microscope -- 8.4 Indirect Indices for Soil Biological Activity -- 8.4.1 Soil Respiration -- 8.4.1.1 CO2 Gas Sampling -- 8.4.1.2 The Soda Lime Technique -- 8.4.2 Decomposition Rates of Litter -- 8.4.2.1 Fine Litter -- 8.4.2.2 Woody Debris -- 8.4.2.3 Fine Woody Debris -- 8.4.2.4 Coarse Woody Debris (CWD) -- 8.4.2.5 Standard Substrates -- 8.4.2.6 Calculation of Decomposition Rates -- 8.4.3 Soil Enzymes -- 8.4.4 Functional Biodiversity-Phospholipid Ester-linked Fatty Acids (PLFA) and Substrate Utilization Profiles -- 8.4.5 Molecular Tools for Ecological Systems -- 8.4.5.1 DNA Extraction from Soil -- 8.4.5.2 PCR -- 8.4.5.3 Restriction Length Fragment Polymorphism RFLP -- 8.4.5.4 Primers -- 8.4.5.5 Gel Electrophoresis -- 8.4.5.6 DNA Sequencing -- 8.4.5.7 Metagenomics and Transcriptomics -- 8.5 Soil Invertebrates -- 8.5.1 Macrofauna with Emphasis on Earthworms -- 8.5.1.1 Extraction Methods -- 8.5.2 Mesofauna -- 8.5.2.1 Mites and Collembola -- 8.5.2.2 Enchytraeids -- 8.5.3 Microfauna -- 8.5.3.1 Protozoans -- 8.5.3.2 Rotifers -- 8.5.3.3 Tardigrades -- 8.5.3.4 Microfauna-Nematodes -- 8.6 Nitrogen Transformations -- 8.6.1 Nitrogen Fixation -- 8.6.1.1 Acetylene Reduction. , 8.6.1.2 N Accretion through Time -- 8.6.1.3 15N Based Methods -- 8.6.2 Denitrification -- 8.6.2.1 The Acetylene Inhibition Method -- 8.6.2.2 15N Tracer Methods -- 8.6.2.3 Direct N2 Quantification -- 8.6.2.4 Mass Balance Approaches -- 8.6.2.5 Stable Isotope Approaches -- 8.6.2.6 Approaches using in situ Gradients in Environmental Tracers -- 8.6.2.7 Molecular Approaches -- Appendices -- References -- Subject Index.
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  • 3
    Book
    Book
    Stroudsburg, Pa. : Dowden, Hutchingon Ross
    Keywords: Air Microbiology ; Airborne infection ; Microorganisms Dispersal ; Air quality
    Type of Medium: Book
    Pages: XIV, 386 S.
    ISBN: 0879333464
    Series Statement: US/IBP synthesis series 10
    DDC: 574.909/6
    RVK:
    Language: English
    Note: Literaturangaben
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 33 (1997), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Human induced long-term changes in precipitation and stream chemistry have been observed in eastern North America and Europe, but few long-term studies have been conducted in coastal western North America. The objectives of this research were to determine: (1) time trends in precipitation and stream chemistry in a pristine old-growth forest watershed, and (2) seasonal patterns in precipitation and stream chemistry. It was conducted in 58 ha West Twin Creek Watershed, Hoh River Valley, Olympic National Park, Washington from 1984 to 1993. Vegetation consists of old-growth forest, with western hemlock, Douglas-fir, western redcedar, Pacific silver fir, and Sitka spruce being the dominant tree species. Annual precipitation varied from 2336 to 4518 mm during the study period with the majority of the rain falling between October and May. Chemistry of precipitation was strongly dominated by oceanic influences with Na and Cl being the dominant ions. The chemistry of the stream was influenced by bedrock weathering and was dominated by Ca, HCO3, and SO4 and was not strongly related to precipitation chemistry. The pH of precipitation averaged 5.3 over time and ranged from 4.3 to 7.1, while the stream pH averaged 7.5 and ranged from 5.5 to 9.0. There were few long-term trends in the chemical constituents of bulk precipitation or stream water with the exception of a slight decrease in NO3 in precipitation and an increase of SO4 in stream water. A trend of decreasing concentrations of Ca, Mg and Na in precipitation also occurred. There were no significant seasonal patterns in precipitation although the highest SO4 concentrations usually occurred in late spring and summer perhaps due marine algal activity. Strong seasonal trends occurred in concentrations of HCO3, SO4, Ca, Mg, and Na in stream water resulting from weathering and stream flow patterns, with highest ion concentrations occurring just before the onset of the rainy season. Pulses of NO3 in the stream were observed during fall and early winter resulting from the release of NO3 which had accumulated in soils or sediments.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 31 (1995), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The biogeochemistry of a coastal old-growth forested watershed in Olympic National Park, Washington, was examined. Objectives were to determine: (1) concentrations of major cations and anions and dissolved organic C (DOC) in precipitation, throughfall, stemflow, soil solution and the stream; (2) nutrient input/output budgets; and (3) nutrient retention mechanisms in the watershed. Stemilow was more acidic (pH 4.0–4.5) than throughfall (pH 5.1) and precipitation (pH 5.3). Organic acids were important contributors to acidity in throughfall and stemflow and tree species influenced pH. Soil solution pH averaged 6.2 at 40 cm depth. Stream pH was higher (7.6). Sodium (54.0 μeq L-1) and Cl (57.6 μeq L−1) were the dominant ions in precipitation, reflecting the close proximity to the ocean. Throughfall and stemflow were generally enriched in cations, especially K. Cation concentrations in soil solutions were generally less than those in stemilow. Ion concentrations increased in the stream. Dominant ions were Ca (759.7 μeq L−1), Na (174.4 μeq L−1), HCO3 (592.0 μeq L−1), and SO4 (331.5 μeq L−1) with seasonal peaks in the fall. Bedrock weathering strongly influenced stream chemistry. Highest average NO3 concentrations were in the stream (5.2 μeq L−1) with seasonal peaks in the fall and lowest concentrations in the growing season. Nitrogen losses were similar to inputs; annual inputs were 4.8 kg/ha (not including fixation) and stream losses were 7.1 kg/ha. Despite the age and successional status of the forest, plant uptake is an important N retention mechanism in this watershed.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 32 (1996), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sporocarps and sclerotia were collected for a one-year period in 23- and 180-year-old Abies amabilis stands in western Washington. All sporocarps were classified and chemically analyzed for N, P, K, Ca, Mg, Na and Fe. Lactarius sp. and Cortinarius sp. contributed the largest proportion of the total annual epigeous sporocarp production in both stands. Annual epigeous production was 34 kg/ha in the young stand and 27 kg/ha in the mature stand. Hypogeous sporocarp production increased from 1 kg ha-1 yr-1 to 380 kg ha-1 yr-1 with increasing stand age. High sclerotia biomass occurred in the young (2,300 kg/ha) and mature (3,000 kg/ha) stands. Peak sclerotia and epigeous sporocarp biomass in the young stand and epigeous and hypogeous sporocarp biomass in the mature stand coincided with the fall peak of mycorrhizal root biomass. In the young stand, sporocarps produced by decomposer fungi concentrated higher levels of Ca and Mn than those produced by mycorrhizal fungi. In the mature stand, sporocarps of decomposer fungi concentrated higher levels of N, P, Mn, Ca and Fe than sporocarps of mycorrhizal fungi. Epigeous and hypogeous sporocarps concentrated higher levels of N, P, and K than sclerotia or mycelium. The highest concentration of N (4.36%), P (0.76%), K (3.22%) and Na (1,678 ppm) occurred in epigeous sporocarps. Highest Mn (740 ppm) and Ca (20,600 ppm) concentrations occurred in mycelium, while highest Mg (1,929 ppm) concentrations were in hypogeous sporocarps and highest Fe (4,153 ppm) concentrations were in sclerotia.
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  • 8
    ISSN: 1573-515X
    Keywords: N saturation ; nitrification ; nutrient deficiency ; nutrient imbalance ; Picea glauca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Excess N delivered to forest ecosystems has been shown to alterinternal ecosystem biogeochemical cycles, contribute to forestdecline, and negatively affect the health of receiving waters.In the vicinity of the Nikiski Industrial Complex, Kenai Peninsula,Alaska, there has been recent concern about the influence ofNH3 emissions that have occurred for over twodecades on local soils and vegetation. The study site representedan opportunity to examine the influence of elevated N depositionon a northern coniferous ecosystem in an area with a low backgroundof N deposition. Overstory vegetation in the area is dominated bywhite spruce (Picea glauca Moench. Voss) and paper birch (Betulapapyrifera Marsh.). Mortality of both species has occurred adjacent(〈2 km) to the industrial complex. Average annual Ndeposition rates ranged from 0.7 to 21.0 kg ha-1 y-1in the area, with the highest rates closest to the complex. Sulfatedeposition at the site was low. Due to the high NH3deposition, precipitation near the complex was less acidic thanprecipitation in general; bulk precipitation pH ranged from 5.51to 7.06. Within 1.80 km of the facility there was an increase inKCl- and resin- extractable soil NH4+ andNO3- in the O horizon, and a decrease in soil pHcompared to soils further from the facility. Spruce near thefacility had chlorotic foliage and thinning crowns, higherconcentrations of N, but lower foliar Ca and Mg. Foliar Mglevels approached deficiency levels, but foliar Ca was wellabove reported deficiency levels at all sites. Both Mg:N andCa:N ratios, however, suggest nutrient imbalances in the highN deposition zone. Canopy death and fertilization by N appearto have encouraged growth of the native bluejoint grass. Thepresence of elevated NO3- in O horizon soilextracts, elevated NO3- in resin bags placed betweenthe O and E horizons, and nutritional imbalances in the foliagesuggest that N saturation may be occurring in soils adjacent to thefacility.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 96 (1986), S. 215-224 
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Daviesia mimosoides ; Eucalypt forest ; Nitrogen fixation ; Nodulation ; Understorey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Daviesia mimosoides is a common understorey legume in Eucalyptus forests of the Brindabella Range in southeastern Australia, capable of fixing atmospheric nitrogen. Rates of N fixation were measured by the acetylene-reduction technique over a growing season in the field. Pot trials under controlled conditions were also carried out to elucidate effects of soil moisture, temperature, and light. Average rates in the field varied from about 1–5 μ mol C2H4/g/h (wet weight of nodule), but rates up to 14 μ mol C2H4/g/h were measured in optimum controlled conditions. Annual N-fixation rates approximate 4.5–7.0 kg/ha. In pot trials, rate of acetylene reduction decreased with soil moisture to about−10 MPa tension, with a marked depression at about−6 MPa, but within the normal field range of soil moisture there was little correlation of moisture with average acetylene reduction rate. Rates were similar in the temperature range of 20–30°C, but were depressed by either low or high temperature (〈10 or 〉30°C). Diurnal fluctuations in acetylene reduction rates were not correlated with solar radiation, but rates were limited by high mid-day temperatures.
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