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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen deposition and carbon sequestration (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 629-629 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nadelhoffer et al. use 15N-tracer studies in nine northern forests to argue that increasing inputs of combined nitrogen from the atmosphere are unlikely to cause the increase in forest growth that has been postulated as the ‘missing sink’ for atmospheric ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/23174
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  • 2
    Electronic Resource
    Electronic Resource
    Accumulation of carbon and nitrogen by old arable land reverting to woodland (2003)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 9 (2003), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The accumulation of carbon (C) and nitrogen (N) was measured on two sites on Rothamsted Farm that had been fenced off some 120 years ago and allowed to revert naturally to woodland. The sites had previously been arable for centuries. One had been chalked and was still calcareous; the other had never been chalked and the pH fell from 7.1 in 1883 to 4.4 in 1999. The acidic site (Geescroft wilderness) is now a deciduous wood, dominated by oak (Quercus robor); the calcareous site (Broadbalk wilderness) is now dominated by ash (Fraxinus excelsior), with sycamore (Acer pseudoplatanus) and hawthorn (Craetagus monogyna) as major contributors. The acidic site gained 2.00 t C ha−1 yr−1 over the 118-year period (0.38 t in litter and soil to a depth of 69 cm, plus an estimated 1.62 t in trees and their roots); the corresponding gains of N were 22.2 kg N ha−1 year−1 (15.2 kg in the soil, plus 6.9 kg in trees and their roots). The calcareous site gained 3.39 t C ha−1 year−1 over the 120-year period (0.54 t in the soil, plus an estimated 2.85 t in trees and roots); for N the gains were 49.6 kg ha−1 yr−1 (36.8 kg in the soil, plus 12.8 kg in trees and roots). Trees have not been allowed to grow on an adjacent part of the calcareous site. There is now a little more C and N in the soil from this part than in the corresponding soil under woodland. We argue from our results that N was the primary factor limiting plant growth and hence accumulation of C during the early stages of regeneration in these woodlands. As soil organic N accumulates and the sites move towards N saturation, other factors become limiting. Per unit area of woodland, narrow strips; that is, wide hedges with trees, are the most efficient way of sequestering C – provided that they are not short of N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2486.2003.00633.x
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  • 3
    Electronic Resource
    Electronic Resource
    Model estimates of CO 2 emissions from soil in response to global warming (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 304-306 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Climate change can influence the stock of soil organic matter in two ways: by altering plant growth, thus altering the annual return of plant debris to the soil; and by changing the rate at which this input decays in or on the soil. Here we are concerned with the second of these processes: the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351304a0
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  • 4
    Electronic Resource
    Electronic Resource
    Growth and uptake of nitrogen by wheat and ryegrass in fumigated and irradiated soil (1972)
    Springer
    Plant and soil 36 (1972), S. 149-158 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Wheat and ryegrass were grown in pots containing soil that had either been irradiated, fumigated with methyl bromide, fumigated with formaldehyde, or left untreated. All pots received a basal dressing of potassium, phosphorus and magnesium; response to nitrogen was tested by applying either 0, 0.177 or 0.354 g nitrogen per pot. Irradiation increased the growth of wheat and ryegrass; uptake of nitrogen was also increased in both crops. The amount of fertilizer nitrogen equivalent to the nitrogen supplied by seeds and soil (the “N value”) can be calculated from the efficiency of uptake of fertilizer nitrogen and used to allow for the effect on crop growth of the nitrogen released by irradiated soil. With wheat the increase in growth can be attributed solely to the extra mineral nitrogen released by irradiated soil. However, ryegrass grew a little better than would have been expected if the only effect of irradiation was to increase the release of soil nitrogen. Fumigation with methyl bromide or formaldehyde increased the growth of wheat and ryegrass not given fertilizer nitrogen. However, fumigation with methyl bromide left ionic bromide in the soil, and this depressed the growth of wheat receiving fertilizer nitrogen. Formaldehyde also left residues; these influenced soil metabolism and sometimes depressed the growth of plants given fertilizer nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373465
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and uptake of nitrogen by wheat and ryegrass in fumigated and irradiated soil (1972)
    Springer
    Plant and soil 36 (1972), S. 149-158 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Wheat and ryegrass were grown in pots containing soil that had either been irradiated, fumigated with methyl bromide, fumigated with formaldehyde, or left untreated. All pots received a basal dressing of potassium, phosphorus and magnesium; response to nitrogen was tested by applying either 0, 0.177 or 0.354 g nitrogen per pot. Irradiation increased the growth of wheat and ryegrass; uptake of nitrogen was also increased in both crops. The amount of fertilizer nitrogen equivalent to the nitrogen supplied by seeds and soil (the “N value”) can be calculated from the efficiency of uptake of fertilizer nitrogen and used to allow for the effect on crop growth of the nitrogen released by irradiated soil. With wheat the increase in growth can be attributed solely to the extra mineral nitrogen released by irradiated soil. However, ryegrass grew a little better than would have been expected if the only effect of irradiation was to increase the release of soil nitrogen. Fumigation with methyl bromide or formaldehyde increased the growth of wheat and ryegrass not given fertilizer nitrogen. However, fumigation with methyl bromide left ionic bromide in the soil, and this depressed the growth of wheat receiving fertilizer nitrogen. Formaldehyde also left residues; these influenced soil metabolism and sometimes depressed the growth of plants given fertilizer nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373465
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of fertilizer nitrogen and season on the carbon-13 abundance of wheat straw (1995)
    Springer
    Plant and soil 171 (1995), S. 365-367 
    Details
    ISSN: 1573-5036
    Keywords: carbon-13 ; carbon isotope fractionation ; nitrogen fertilization ; winter wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Carbon-13 abundance, expressed as δ13C in ‰, was measured in wheat straw grown between 1984 and 1989 on the Broadbalk Continuous Wheat Experiment at Rothamsted. In all six years, straw grown without fertilizer N contained less carbon-13 (i.e.δ13C was more negative) than straw grown with fertilizer, although the magnitude of this difference varied with year. In a dry year, when dry matter response to fertilizer N was relatively small, there was a large difference between the δ13C of straw grown with and without N. Conversely, in a wet year, when there was a marked response to N, there was little difference in the isotopic composition of N-fertilized and unfertilized straw. Over the six years, the difference between the δ13C value of straw grown with and without nitrogen (D 13C, in ‰) was related to drought, measured as the calculated soil water deficit on 15 July (Wj, in mm), by the equation D 13C=−0.299+0.01034 Wj (r=0.87). H Lambers Section editor
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010293
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of water-logging on fixation of nitrogen by soil incubated with straw (1962)
    Springer
    Plant and soil 16 (1962), S. 258-262 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary When straw was incubated with a calcareous soil under water-logged conditions nitrogen fixation occurred if the gas above the incubation contained oxygen: no detectable fixation occurred if oxygen was excluded. Moist soil failed to fix nitrogen when incubated with straw in either the presence or absence of oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01377221
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  • 8
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    Turnover of Nitrogen-15-Labeled Fertilizer in Old Grassland (2004)
    Wiley
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 9
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    Decomposition of Carbon-14 Labeled Ryegrass and Maize under Tropical Conditions (1990)
    Wiley
    Details
    Publication Date: 1990-01-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 10
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    Modeling Soil Carbon from Forest and Pasture Ecosystems of Amazon, Brazil (2003)
    Wiley
    Details
    Publication Date: 2003-11-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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