Artikkelit jotka sisältää sanan 'Decomposition'
Carbon storage response to harvesting and site preparation in a forested mire in northern Michigan, U.S.A.
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This study considered the effects on carbon pools in a forested mire following whole-tree harvesting and two site preparation treatments; bedding and trenching. Whole-tree harvesting, which resulted in complete removal of the overstory biomass, and bedding exhibited the greatest loss of carbon from the site. Removal of the overstory biomass and increased decomposition of organic matter were the major causes of carbon loss. Measurement of the soil carbon pools in the tree planting zone did not provide an accurate assessment of the treatment effect. Renewal of carbon accumulation will depend on the productivity and composition of the regenerating plant community and on the rate of decomposition of organic matter.
Keywords: Decomposition, organic matter, site preparation, whole-tree harvest
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Trettin,
Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008 MS-6038, Oak Ridge, 77V 37831-6038 U.S.A
Sähköposti:
ei.tietoa@nn.oo
- Gale, Sähköposti: ei.tietoa@nn.oo
- Jurgensen, Sähköposti: ei.tietoa@nn.oo
- McLaughlin, Sähköposti: ei.tietoa@nn.oo
The effect of plant roots on C02 release from peat soil.
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The contribution of roots to the release of C02 from peat has been examined in both field and laboratory experiments. In the field experiment, columns of peat were isolated from the surrounding peat and the green parts of the plants were continually removed in order to exhaust the living roots contained within the column. The isolated columns released c. 10-20% less C02 than the reference spots where only the growth of the green parts was restrained. C02 production in isolated columns was thereby reduced mostly in mire site types with largest dwarf shrub root biomass. In the greenhouse experiment, C02 release was c. 36% greater from containers containing willow (Salix phylicifolia) roots than from bare peat reference containers.
Keywords: Carbon allocation, decomposition, soil respiration
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Silvola,
Department of Biology, University of Joensuu, P.O. Box 111, FIN-80J0/ Joensuu, Finland
Sähköposti:
ei.tietoa@nn.oo
- Jukka, Sähköposti: ei.tietoa@nn.oo
- Ahlholm, Sähköposti: ei.tietoa@nn.oo
Microbiological and organic characterisation of peat.
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Activity during the first phase of this SUOSILMU subproject was mainly focused on the development of methods for the fractionation of peat into its organic components and for the determination of microbial bio-mass. It is now possible to characterise peat using some fifty organic compounds. Using these methods, the effects of drainage intensity and fertilization on the organic character of the peat have been investigated. From the preliminary results, it appears that these methods can be used to determine more exactly the effects of such amelioration practices on the decomposition of peat. During the next phase of the project (1993— 1995), the production and decomposition rates of different organic compounds will be determined in long-term incubation experiments.
Keywords: Decomposition, microbiological analysis, organic compounds, peatland
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Karsisto,
The Finnish Forest Research Institute, Department of Forest Ecology, P.O. Box 18, FIN-0I30I Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
Ojituksen ja lannoituksen vaikutus turpeen hiilen vapautumiseen ja ravinteiden mineralisoitumiseen.
English title: Effect of drainage and fertilization on carbon output and nutrient mineralization of peat.
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Carbon dioxide production increased to 2-3 fold from the peat of an oligotrophic sedge pine mire (VSR) after draining had lowered the water table to a depth c, 0.5 m. At two other sites, a mesotrophic sedge pine mire (RhSR) and a spruce swamp (MK), both the fall in the groundwater table and the increase in C02 production were smaller. At the VSR site, the fast-dissolving PK fertilizer and urea each caused a rapid increase while the slow-dissolving PK fertilizer a slow increase in soil respiration. The greatest, steady increase was achieved by treatment with wood ash. At RhSR and MK sites, the use of fertilizers generally led to a decline in soil respiration for 1-2 years, after which the initial level was normally regained. According to a simulation of the C02 production after drainage, the annual decomposition of peat was calculated to be c. 1 000 g (organic matter) m-2 in the VSR site. On the basis of this decomposition rate, the annual amount of nitrogen mineralizated was estimated to be c. 100 kg ha-1 and that of phosphorus c. 5 kg ha-1. Peat contains only a small amount of potassium, and the decomposition of old peat layers increases the amount of soluble potassium in peat very little.
Keywords: Carbon balance, drainage, fertilization, nutrient mineralization, peat decomposition
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Silvola,
Department of Biology, University of Joensuu, P.O. Box 111, SF-80101 Joensuu, Finland
Sähköposti:
ei.tietoa@nn.oo
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