Search results for: organic-matter-accumulation

Organic Matter Accumulation in European Peatlands On the Basis of 14C Data

Author : Sławomir Żurek
File Size : 89.79 MB
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Respiration and organic matter accumulation in a lowland heathland soil

Author : S B. Chapman
File Size : 37.80 MB
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Studies on Soil Organic Matter

Author : T. W. Walker
File Size : 41.84 MB
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Organic Matter Accumulation in Sand Beased i e Based Root Zones

Author : Timothy D. VanLoo
File Size : 44.1 MB
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Organic Matter Accumulation

Author : Elisabeth Lallier-Verges
File Size : 82.40 MB
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The accumulation of organic matter allows inferences about a wide selection of processes in the geological past. The Kimmeridge Clay Formation (Yorkshire, U.K.) can be regarded as a model of the formation of hydrocarbon source rocks. The driving force of organic matter accumulation is the organic phytoplankton productivity, whereas oxygenation conditions seem to have played a secondary role. In Lake Bouchet (French Massif Central) organic matter appears to be a good indicator of paleoenvironmental changes occurring for over 350000 years. The book is of special interest to geologists and geochemists interested in organic matter accumulation.

Nutrient and organic matter accumulation in Acacia senegal fallows over 18 years

Author : J D (Doug) Deans
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Amounts of biomass, soil organic matter, soil and tissue N, P and K were assessed using regression techniques in widely spaced Acacia senegal plantations, aged between 3 and 18 years in northern Senegal, in order to provide quantitative information on the rate of site nutrient enrichment in tree fallows. Tree biomass increased linearly with time from Age 3 to Age 18 and was linearly related to stem cross-sectional area at 30 cm height. Between ages 3 and 18 years, above- and below-ground biomass accumulation averaged ca. 1770 kg ha(-1) year(-1) for trees evenly spaced at 6 m. By Age 18, the average tree had accumulated ca. 945, 38 and 420 g of N, P and K, respectively. As expected, concentrations of N, P, and K were greater in leaves and fruits than in woody tissues, and nutrient concentrations in wood decreased as tissue diameter increased. Phosphorus concentrations in wood decreased as tissues aged and there was evidence to suggest P retranslocation from woody tissues as trees grew older. In general, P concentrations in roots were similar to those found in above-ground woody tissues, but N and K concentrations in woody roots were, respectively, greater and smaller than concentrations found in above-ground woody tissues of similar diameter. Soil organic matter, N, P and K concentrations were always greatest in surface horizons close to stems. However, unlike the case for N and K, there was little evidence of increasing P in surface soil as plantations aged. Correlations of amounts of N, P and K with amounts of soil organic matter were only significant in surface horizons and there was no evidence of soil amelioration other than near the soil surface. Increases of N and K in surface soil could be predicted by multiple regression equations based on tree age and inter tree spacing. N and K increased in surface soil by ca. 24 and 4 kg ha(-1) year(-1) respectively, in plantations at 6-m spacing and soil organic matter increased by ca. 0.05% and 0.035% year(-1) under tre.

Decomposition and Accumulation of Organic Matter in Soil Comaprison of Some Models

Author : P. de Willigen
File Size : 54.61 MB
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Nitrogen and Organic matter Accumulation in Coal Mine Spoils Supporting Red Alder Stands

Author : P. Heilman
File Size : 72.28 MB
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Standing crop and organic matter accumulation on British heathlands

Author : S B. Chapman
File Size : 83.40 MB
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Nutrient Constraints on Plant Community Production and Organic Matter Accumulation of Subtropical Floating Marshes

Author : Guerry O. Holm
File Size : 82.58 MB
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Organic Matter Accumulation Beneath Maintained Turfgrass Systems

Author : Harold David Goodman
File Size : 53.16 MB
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Keywords: thatch, bentgrass, organic matter, carbon sequestration.

A Study of Soil Organic Matter and Its Controlling Factors in Portland Oregon

Author : Megan Dillon
File Size : 76.52 MB
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Traditionally, local above- and below-ground plant and microbial communities, temperature and precipitation, topography and texture and composition of parent material have been thought to govern the soil processes that lead to soil organic matter accumulation over decades or centuries. Soil organic matter is a substantial global reservoir of carbon and disturbance of equilibrated soils often leads to efflux of significant quantities of CO2. Anthropogenic influences shift the inputs, disturb the structure and alter the biochemistry of soil, profoundly disrupting soil-forming processes. Urbanization leads to soil organic matter equilibria that are different from those in naturally forming soils. Measurement of soil organic matter in diverse cities suggests that they differ in their capacity to accumulate soil organic matter. Here I quantify soil organic matter and examine the limitations of its accumulation within cities by comparing differences in soil organic matter and natural and anthropogenic characteristics at the neighborhood, city and regional scales in Portland, Oregon to that in the Pacific Northwest. I found that each Portland neighborhood has distinct urban characteristics and tree and shrub community composition, but soil organic matter content is indistinguishable among them. Across Portland, neither vegetation structure nor urban factors appear to directly influence soil organic matter content. Rather, microbial biomass, bulk density and total nitrogen appear to be important factors controlling soil organic matter content in Portland. The amount of soil organic matter stored in Portland's soils is statistically indistinguishable from Pacific Northwest soils, in contrast to other temperate cities.

Organic Matter Accumulation

Author : Elisabeth Lallier-Vergès
File Size : 79.85 MB
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The accumulation of organic matter allows inferences about a wide selection of processes in the geological past. The Kimmeridge Clay Formation (Yorkshire, U.K.) can be regarded as a model of the formation of hydrocarbon source rocks. The driving force of organic matter accumulation is the organic phytoplankton productivity, whereas oxygenation conditions seem to have played a secondary role. In Lake Bouchet (French Massif Central) organic matter appears to be a good indicator of paleoenvironmental changes occurring for over 350000 years. The book is of special interest to geologists and geochemists interested in organic matter accumulation.

Organic Matter

Author : Jean K. Whelan
File Size : 43.61 MB
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Sediments from the world's ocean floors and other water body basins hold a wealth of information about organic life as we know it. Organic Matter: Productivity, Accumulation, and Preservation in Recent and Ancient Sediments addresses focusing on the production, accumulation, and preservation of organic matter in marine and lacustrine sediments. Contributors to this important monograph cover a range of geologic ages from recent times back to the Permian Era, as well as temperature and organic matter types. This resource book will be of interest and benefit to petroleum explorationists and researchers, as well as oceanographers, marine and environmental scientists, sedimentologists, geochemists and paleontologists.

Organic Matter Accumulation in Reclaimed Soils Beneath Different Vegetation Types in the Athabasca Oil Sands

Author : Jeff Anderson
File Size : 67.77 MB
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Organic Matter Accumulation and Preservation in the Western Interior Seaway of North America

Author : Kevin S. George
File Size : 90.69 MB
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Effect of Surface Rock Fragment Cover on Accumulation of Organic Matter and Charcoal on Mountain Soils in Northern California

Author : Philip R. Clements
File Size : 66.98 MB
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Soil surface covers are critical to understanding the influence of aboveground inputs on underlying soils. Surface covers are often composed of organic material, but mountain soil surfaces are sometimes covered with rock fragments. This study compared mountain soils at two study sites in Klamath National Forest to determine the influence of surface rock fragments on physical soil properties and organic matter accumulation. One soil had a distinct surface rock fragment layer of cobbles and stones above the soil, and the other had only a layer of organic litter. Soil temperature and moisture were measured continuously for a year. Organic litter, soil organic carbon, and pyrogenic carbon were measured and described to detect differences in decomposition and microbial activity. Morphology of the surface horizons was distinctly different, and accumulation of litter around rock fragments was not continuous across the surface. The O horizons from each site show dissimilarity in decomposition, but soil organic carbon was generally similar within the mineral soils. Results indicate that surface rock fragments increased soil and near-surface temperatures, and controlled moisture movement and retention to a lesser extent. These factors may negatively influence microbial and fungal activity, which are dependent on temperature and moisture status in the litter layers around rock fragments. Examination of pyrogenic char samples suggests that surface rock fragments can control or impede the contact between aboveground inputs and underlying mineral soils. In addition, contact with soil microbes that may use char as habitat, can be prevented.

The Accumulation of Soil Organic Matter and Its Carbon Isotope Content in a Chronosequence of Soils Developed on Aeolian Sand in New Zealand

Author : Kuan M. Goh
File Size : 40.32 MB
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The Accumulation of Soil Organic Matter from Wood Chips

Author : Milton Salomon
File Size : 85.64 MB
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Salt Marsh Biogeochemistry and Sediment Organic Matter Accumulation

Author : Cassondra Regina Thomas
File Size : 60.45 MB
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