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  • 1. do Nascimento, NR
    et al.
    Nicola, SMC
    Rezende, MOO
    Oliveira, TA
    Öberg, Gunilla
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tematisk utbildning och forskning, Miljövetenskap.
    Pollution by hexachlorobenzene and pentachlorophenol in the coastal plain of Sao Paulo state, Brazil2004Inngår i: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 121, nr 03-Apr, s. 221-232Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Organochlorine compounds were dumped by chemical industries during the 1970s in many areas of the coastal plain of Sao Paulo state in Brazil. These dumps, located on hillsides and in valleys, in both rural and urban environments, are responsible for soil and water pollution. The objective of this work was to determine how the pollutants have spread in an area occupied by a spodosol-type soil mantle. The study combines soil morphological observations with soil and water analysis of hexachlorobenzene (HCB) and pentachlorophenol (PCP) in soil toposequences. The results indicate that the highest pollutant concentrations are observed near the dump site and that the compounds contamination is increasing. A map integrating topography and chemical concentrations was created to visualize the spatial distribution of HCB levels in the landscape. Physical and chemical analyses were performed to measure HCB and PCP levels in the soil. Soil water appears to act as a vector of HCB, probably through complexation with and dispersal of dissolved organic matter. The persistence of HCB at the studied site is most likely due to the low pH values in combination with a high content of organic matter. HCB was consistently found in higher concentrations than PCP. It is plausible that the cause of this difference is that PCP is degraded more easily under sunlight than HCB and that degradation of PCP under acid conditions leads to the formation of HCB. (C) 2003 Published by Elsevier B.V.

  • 2.
    Johansson, Emma
    et al.
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Ebenå, Gustav
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Sandén, Per
    Linköpings universitet, Institutionen för tematisk utbildning och forskning, Miljövetenskap. Linköpings universitet, Filosofiska fakulteten.
    Svensson, Teresia
    Linköpings universitet, Institutionen för tematisk utbildning och forskning, Miljövetenskap. Linköpings universitet, Filosofiska fakulteten.
    Öberg, Gunilla
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Organic and chlorine in Swedish spruce forest soil: Influence of nitrogen2001Inngår i: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 101, nr 3-4, s. 1-13Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Concentrations of organic and inorganic chlorine were estimated in samples collected in forest soils in the southern part of Sweden, and changes were observed after the addition of nitrogen in incubated samples. All of the investigated samples contained both inorganic and organic chlorine, and the concentration of organic chlorine was 2-4 times larger than that of inorganic chlorine. The results suggest that the amount of organic chlorine in mature spruce forest soils with a moderate chloride deposition in the temperate region is larger than the amount of inorganic chlorine. The results of the nitrogen incubation indicate that addition of ammonium nitrate causes a net decrease in the concentration of organic chlorine and a net increase in chloride concentration. The observed change appears to mainly be a result of a dechlorination of the organic matter present in the water leachable fraction. © 2001 Elsevier Science B.V.

  • 3.
    Mendes, Lipe Renato Dantas
    et al.
    Aarhus Univ, Denmark.
    Tonderski, Karin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska fakulteten.
    Kjaergaard, Charlotte
    Aarhus Univ, Denmark; SEGES, Denmark.
    Phosphorus accumulation and stability in sediments of surface-flow constructed wetlands2018Inngår i: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 331, s. 109-120Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Surface-flow constructed wetlands (CWs) are systems that replicate the nutrient reduction processes of natural wetlands and are considered suitable measures to reduce the nutrient losses from agricultural drainage discharge to surface waters. The present study aimed to investigate the biogeochemical stability of phosphorus (P) in three CWs. Intact soil cores were collected from each CW zone and included the soil and the sediment layer (average 28 mm thickness) formed by deposition of the incoming sediments with the water flow. Soil and sediment layer were analysed geochemically, including bulk density, pH, and total contents of carbon, nitrogen, P as well as different extracts of iron (Fe), aluminium and P. In situ measurements of soil redox potential, dissolved oxygen concentration and temperature were carried out in the CWs during 16 months. Grab water samples were collected across the CWs for determination of P species, total Fe, sulphate and pH. Soil core analysis revealed that the major P storage in the CWs was attributed to retention of Fe-bound P in the sediment layer. The Fe and total P (TP) retention differed significantly between CWs (11-63 g Fe m(-2) yr(-1) and 1-9 g TP m(-2) yr(-1)). Amorphous Fe oxides constituted the major P sorbent fraction in the soil and sediments of all CWs, and the higher P sorption capacity in the sediment layer demonstrated the continuous supply of P sorbents to this layer. The stability of Fe bound P in the anaerobic sediments seemed to be controlled by the high molar ratios of bicarbonate-dithionite extractable Fe (Fe-BD) to associated P, which varied from 21 to 49, and the presence of an aerobic sediment-water

  • 4.
    Yang, P.
    et al.
    Fujian Normal Univ, Peoples R China.
    Wang, M. H.
    Fujian Normal Univ, Peoples R China.
    Lai, Derrick Y. F.
    Chinese Univ Hong Kong, Peoples R China.
    Chun, K. P.
    Hong Kong Baptist Univ, Peoples R China.
    Huang, J. F.
    Fujian Normal Univ, Peoples R China.
    Wan, S. A.
    Fujian Normal Univ, Peoples R China.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Tong, C.
    Fujian Normal Univ, Peoples R China.
    Methane dynamics in an estuarine brackish Cyperus malaccensis marsh: Production and porewater concentration in soils, and net emissions to the atmosphere over five years2019Inngår i: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 337, s. 132-142Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wetlands can potentially affect global climate change through their role in modulating the atmospheric concentrations of methane (CH4). Their overall CH4 emissions, however, remain the greatest uncertainty in the global CH4 budget. One reason for this is the paucity of long-term field measurements to characterize the variability of CH4 emissions from different types of wetlands. In this study, we quantified CH4 emissions from a brackish, oligohaline Cyperus malaccensis marsh ecosystem in the Min River Estuary in southeast China over five years. Our results showed substantial temporal variability of CH4 emissions from this brackish marsh, with hourly fluxes ranging from 0.7 +/- 0.6 to 5.1 +/- 3.7 mg m(-2) h(-1) (mean +/- 1 SD) during the study period. The inter-annual variability of CH4 emissions was significantly correlated with changes in soil temperature, precipitation and salinity, which highlighted the importance of long-term observations in understanding wetland CH4 dynamics. Distinct seasonal patterns in soil CH4 production rates and porewater CH4 concentrations also were observed, and were both positively correlated with CH4 emissions. The seasonal variations of CH4 emissions and production were highly correlated with salinity and porewater sulfate levels. The mean annual CH4 efflux from our site over the five-year period was 23.8 +/- 18.1 g CH4 m(-2) yr(-1), indicating that subtropical brackish tidal marsh ecosystems could release a large amount of CH4 into the atmosphere. Our findings further highlight the need to obtain high-frequency and continuous field measurements over the long term at multiple spatial scales to improve our current estimates of wetland CH4 emissions.

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