liu.seSearch for publications in DiVA
Endre søk
Begrens søket
1 - 10 of 10
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Eneland, Anna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologi.
    Metoder för att undersöka effekterna av naturvårdshänsynen i skogsbruket efter den nya skogsvårdslagen2010Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Detta arbete har undersökt skillnaderna mellan den nuvarande skogsvårdslagen och den föregående. Undersökningen har bestått av två delar, där ena delen är en litteraturstudie av lagarna och den andra är en fältstudie av metoder för att mäta naturhänsynsförändring. Som komplement till fältstudien har en litteraturstudie av undersökningsparametranas naturvårdsnytta. Litteraturstudien av lagarna gick till på följande sätt, inledningen av båda lagarna och hänsynsparagraferna har lästs och jämförts. Fältstudie har gjorts efter metoder som har arbetats fram och sedan testats i fält. De undersökningsområden som har testats är stående död ved med undergruppen konstgjorda högstubbar, grova träd, hänsynsytor, trädslagsfördelning och boträd. Testningen skedde i trakterna kring Orsa i Dalarnas län. Resultatet blev att hälften av undersökningsområdena skulle kunna användas i en större studie efter några modifikationer. Andra hälften av undersökningsområdena kan det inte på grund av att referensdata saknas. Lagstudien visade att den största skillnaden mellan de båda lagarna ligger i att i den nuvarande har man jämställt miljömålet med produktionsmålet. Det finns även en attitydförändring till en större öppenhet mot naturvård i den nya lagen.

  • 2.
    Figueiredo, Viviane
    et al.
    Univ Fed Rio de Janeiro, Brazil; Univ Fed Fluminense, Brazil; Univ Fed Rio de Janeiro, Brazil.
    Enrich Prast, Alex
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Univ Fed Rio de Janeiro, Brazil; Univ Fed Fluminense, Brazil; Univ Fed Rio de Janeiro, Brazil.
    Rutting, Tobias
    Univ Gothenburg, Sweden.
    Evolution of nitrogen cycling in regrowing Amazonian rainforest2019Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, artikkel-id 8538Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Extensive regions of tropical forests are subjected to high rates of deforestation and forest regrowth and both are strongly affect soil nutrient cycling. Nitrogen (N) dynamics changes during forest regrowth and the recovery of forests and functioning similar to pristine conditions depends on sufficient N availability. We show that, in a chronosequence of Amazonian forests, gross nitrification and, as a result, nitrate-to-ammonium (NO3- : NH4+) ratio were lower in all stages of regrowing forests (10 to 40 years) compared to pristine forest. This indicates the evolution of a more conservative and closed N cycle with reduced risk for N leaking out of the ecosystem in regrowing forests. Furthermore, our results indicate that mineralization and nitrification are decoupled in young regrowing forests (10 years), such as that high gross mineralization is accompanied by low gross nitrification, demonstrating a closed N cycle that at the same time maintains N supply for forest regrowth. We conclude that the status of gross nitrification in disturbed soil is a key process to understand the mechanisms of and time needed for tropical forest recovery.

  • 3.
    Korkmaz, M.
    et al.
    Suleyman Demirel Univ, Turkey.
    Akyol, A.
    Suleyman Demirel Univ, Turkey.
    Turkoglu, T.
    Mugla Sitki Kocman Univ, Turkey.
    Bergner, A.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska fakulteten.
    Jansson, Niklas
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska fakulteten.
    Tolunay, A.
    Suleyman Demirel Univ, Turkey.
    PERSPECTIVE ON FOREST BIODIVERSITY INDICATORS FOR PROTECTED AREAS: A COMPARISON OF TURKISH AND SWEDISH FOREST EXPERT OPINIONS2018Inngår i: Applied Ecology and Environmental Research, ISSN 1589-1623, E-ISSN 1785-0037, Vol. 16, nr 3, s. 3595-3609Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a comparative analysis of expert opinions on forest biodiversity indicators for protected areas, using a questionnaire given to forest experts in Turkey and Sweden. Experts were selected according to whether they had studied or worked in areas related to biodiversity, protected areas and sustainable forest management. A Mann-Whitney U test was used to determine the differences between the opinions of Swedish and Turkish experts regarding the indicators. The experts from both countries considered "endemic species" and "naturalness" as the most important indicators, while "overused species", "forest distribution and regeneration", "carrying capacity in terms of important species of area" and "the existence of different conservation status of protected areas" were considered equally as the least important indicators. The most important difference between the two groups was related to the indicators "dead wood" and "hollow trees", which Swedish experts found more important than their Turkish counterparts. Two other large differences were that the Swedish experts found "litter layer" much more important and Turkish experts instead found "plant species composition" much more important. The differences between the two groups reveal different perspectives regarding the planning and management of protected areas in each respective country.

  • 4.
    Montelius, Malin
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Chlorine Cycling in Terrestrial Environments2016Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Chlorinated organic compounds (Clorg) are produced naturally in soil. Formation and degradation of Clorg affect the chlorine (Cl) cycling in terrestrial environments and chlorine can be retained or released from soil. Cl is known to have the same behaviour as radioactive chlorine-36 (36Cl), a long-lived radioisotope with a half-life of 300,000 years. 36Cl attracts interest because of its presence in radioactive waste, making 36Cl a potential risk for humans and animals due to possible biological uptake. This thesis studies the distribution and cycling of chloride (Cl) and Clorg in terrestrial environments by using laboratory controlled soil incubation studies and a forest field study. The results show higher amounts of Cl and Clorg and higher chlorination rates in coniferous forest soils than in pasture and agricultural soils. Tree species is the most important factor regulating Cl and Clorg levels, whereas geographical location, atmospheric deposition, and soil type are less important. The root zone was the most active site of the chlorination process. Moreover, this thesis confirms that bulk Clorg dechlorination rates are similar to, or higher than, chlorination rates and that there are at least two major Clorg pools, one being dechlorinated quickly and one remarkably slower. While chlorination rates were negatively influenced by nitrogen additions, dechlorination rates, seem unaffected by nitrogen. The results implicate that Cl cycling is highly active in soils and Cl and Clorg levels result from a dynamic equilibrium between chlorination and dechlorination. Influence of tree species and the rapid and slow cycling of some Cl pools, are critical to consider in studies of Cl in terrestrial environments. This information can be used to better understand Cl in risk-assessment modelling including inorganic and organic 36Cl.

    Delarbeid
    1. Organic Matter Chlorination Rates in Different Boreal Soils: The Role of Soil Organic Matter Content
    Åpne denne publikasjonen i ny fane eller vindu >>Organic Matter Chlorination Rates in Different Boreal Soils: The Role of Soil Organic Matter Content
    Vise andre…
    2012 (engelsk)Inngår i: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 46, nr 3, s. 1504-1510Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Transformation of chloride (Cl-) to organic chlorine (Cl-org) occurs naturally in soil but it is poorly understood how and why transformation rates vary among environments. There are still few measurements of chlorination rates in soils, even though formation of Cl-org has been known for two decades. In the present study, we compare organic matter (OM) chlorination rates, measured by Cl-36 tracer experiments, in soils from eleven different locations (coniferous forest soils, pasture soils and agricultural soils) and discuss how various environmental factors effect chlorination. Chlorination rates were highest in the forest soils and strong correlations were seen with environmental variables such as soil OM content and Cl- concentration. Data presented support the hypothesis that OM levels give the framework for the soil chlorine cycling and that chlorination in more organic soils over time leads to a larger Cl-org pool and in turn to a high internal supply of Cl- upon dechlorination. This provides unexpected indications that pore water Cl- levels may be controlled by supply from dechlorination processes and can explain why soil Cl- locally can be more closely related to soil OM content and the amount organically bound chlorine than to Cl- deposition.

    sted, utgiver, år, opplag, sider
    American Chemical Society, 2012
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-75467 (URN)10.1021/es203191r (DOI)000299864400030 ()
    Merknad

    Funding Agencies|Swedish Research Council (VR)|2006-5387|

    Tilgjengelig fra: 2012-03-02 Laget: 2012-03-02 Sist oppdatert: 2018-10-05
    2. Experimental Evidence of Large Changes in Terrestrial Chlorine Cycling Following Altered Tree Species Composition
    Åpne denne publikasjonen i ny fane eller vindu >>Experimental Evidence of Large Changes in Terrestrial Chlorine Cycling Following Altered Tree Species Composition
    Vise andre…
    2015 (engelsk)Inngår i: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 49, nr 8, s. 4921-4928Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Organochlorine molecules (Cl-org) are surprisingly abundant in soils and frequently exceed chloride (Cl-) levels. Despite the widespread abundance of Cl-org and the common ability of microorganisms to produce Cl-org, we lack fundamental knowledge about how overall chlorine cycling is regulated in forested ecosystems. Here we present data from a long-term reforestation experiment where native forest was cleared and replaced with five different tree species. Our results show that the abundance and residence times of Cl- and Cl-org after 30 years were highly dependent on which tree species were planted on the nearby plots. Average Cl- and Cl-org content in soil humus were higher, at experimental plots with coniferous trees than in those with deciduous trees. Plots with Norway spruce had the highest net accumulation of Cl- and Cl-org over the experiment period, and showed a 10 and 4 times higher Cl- and Cl-org storage (kg ha(-1)) in the biomass, respectively, and 7 and 9 times higher storage of Cl- and Cl-org in the soil humus layer, compared to plots with oak. The results can explain why local soil chlorine levels are frequently independent of atmospheric deposition, and provide opportunities for improved modeling of chlorine distribution and cycling in terrestrial ecosystems.

    sted, utgiver, år, opplag, sider
    American Chemical Society, 2015
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-118871 (URN)10.1021/acs.est.5b00137 (DOI)000353610300017 ()25811074 (PubMedID)
    Merknad

    Funding Agencies|EDF, France; French national radioactive waste management agency (Andra), France; Linkoping University, Sweden; "Fonds National de la Recherche Scientifique" (FNRS) of Belgium

    Tilgjengelig fra: 2015-06-05 Laget: 2015-06-04 Sist oppdatert: 2018-10-05
    3. Chlorination and dechlorination rates in a forest soil: A combined modelling and experimental approach
    Åpne denne publikasjonen i ny fane eller vindu >>Chlorination and dechlorination rates in a forest soil: A combined modelling and experimental approach
    Vise andre…
    2016 (engelsk)Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 554-555, s. 203-210Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Abstract Much of the total pool of chlorine (Cl) in soil consists of naturally produced organic chlorine (Clorg). The chlorination of bulk organic matter at substantial rates has been experimentally confirmed in various soil types. The subsequent fates of Clorg are important for ecosystem Cl cycling and residence times. As most previous research into dechlorination in soils has examined either single substances or specific groups of compounds, we lack information about overall bulk dechlorination rates. Here we assessed bulk organic matter chlorination and dechlorination rates in coniferous forest soil based on a radiotracer experiment conducted under various environmental conditions (additional water, labile organic matter, and ammonium nitrate). Experiment results were used to develop a model to estimate specific chlorination (i.e., fraction of Cl− transformed to Clorg per time unit) and specific dechlorination (i.e., fraction of Clorg transformed to Cl− per time unit) rates. The results indicate that chlorination and dechlorination occurred simultaneously under all tested environmental conditions. Specific chlorination rates ranged from 0.0005 to 0.01 d− 1 and were hampered by nitrogen fertilization but were otherwise similar among the treatments. Specific dechlorination rates were 0.01–0.03 d− 1 and were similar among all treatments. This study finds that soil Clorg levels result from a dynamic equilibrium between the chlorination and rapid dechlorination of some Clorg compounds, while another Clorg pool is dechlorinated more slowly. Altogether, this study demonstrates a highly active Cl cycling in soils.

    sted, utgiver, år, opplag, sider
    Elsevier, 2016
    Emneord
    Chlorine cycling, Chloride, Organic chlorine, Radioactive chlorine-36, Modelling
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-125912 (URN)10.1016/j.scitotenv.2016.02.208 (DOI)000373274700022 ()26950634 (PubMedID)
    Merknad

    Funding agencies:  EDF, France; National Radioactive Waste Management Agency (Andra), France; Linkoping University, Sweden

    Tilgjengelig fra: 2016-03-08 Laget: 2016-03-08 Sist oppdatert: 2018-10-05bibliografisk kontrollert
  • 5.
    Montelius, Malin
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Svensson, Teresia
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Lourino-Cabana, Beatriz
    EDF, Laboratoire National d'Hydraulique et Environnement, 78401 Chatou, France.
    Thiry, Yves
    Andra, Research and Development Division, Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92298 Châtenay-Malabry Cedex, Franc.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Chlorination and dechlorination rates in a forest soil: A combined modelling and experimental approach2016Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 554-555, s. 203-210Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Abstract Much of the total pool of chlorine (Cl) in soil consists of naturally produced organic chlorine (Clorg). The chlorination of bulk organic matter at substantial rates has been experimentally confirmed in various soil types. The subsequent fates of Clorg are important for ecosystem Cl cycling and residence times. As most previous research into dechlorination in soils has examined either single substances or specific groups of compounds, we lack information about overall bulk dechlorination rates. Here we assessed bulk organic matter chlorination and dechlorination rates in coniferous forest soil based on a radiotracer experiment conducted under various environmental conditions (additional water, labile organic matter, and ammonium nitrate). Experiment results were used to develop a model to estimate specific chlorination (i.e., fraction of Cl− transformed to Clorg per time unit) and specific dechlorination (i.e., fraction of Clorg transformed to Cl− per time unit) rates. The results indicate that chlorination and dechlorination occurred simultaneously under all tested environmental conditions. Specific chlorination rates ranged from 0.0005 to 0.01 d− 1 and were hampered by nitrogen fertilization but were otherwise similar among the treatments. Specific dechlorination rates were 0.01–0.03 d− 1 and were similar among all treatments. This study finds that soil Clorg levels result from a dynamic equilibrium between the chlorination and rapid dechlorination of some Clorg compounds, while another Clorg pool is dechlorinated more slowly. Altogether, this study demonstrates a highly active Cl cycling in soils.

  • 6.
    Ostwald, Madelene
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema, Centrum för klimatpolitisk forskning. Centre for Environment and Sustainability (GMV), University of Gothenburg, Göteborg, Sweden.
    Climate-related forest policies and trends2015Inngår i: The future use of Nordic forests: a global perspective / [ed] Erik Westholm, Karin Beland Lindahl, Florian Kraxner, Cham: Springer, 2015, s. 99-109Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    As part of the carbon cycle, forests have a place in climate-related forest policies and trends. By describing forest-related measures driven by international climate negotiations, such as the afforestation and reforestation under the Clean Development Mechanism (CDM) and REDD+ (Reducing Emissions from Deforestation and Forest Degradation), or the voluntary carbon market, this chapter illustrates how carbon has become an important but fuzzy commodity. The demand for carbon-focused measures is also seen in suggested activities in the Swedish context, shown with the Arctic Boreal Climate Development (ABCD) project. It can be said that due perhaps to the complexity involved in quantifying and accounting for carbon, other benefits such as energy substitution or improved hydrology from carbon-improving management strategies are being enhanced in the debate.

  • 7.
    Petersson, Linda K.
    et al.
    Swedish Univ Agr Sci, Sweden.
    Milberg, Per
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska fakulteten.
    Bergstedt, Johan
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska fakulteten.
    Dahlgren, Jonas
    Swedish Univ Agr Sci, Sweden.
    Felton, Annika M.
    Swedish Univ Agr Sci, Sweden.
    Gotmark, Frank
    Univ Gothenburg, Sweden.
    Salk, Carl
    Swedish Univ Agr Sci, Sweden.
    Lof, Magnus
    Swedish Univ Agr Sci, Sweden.
    Changing land use and increasing abundance of deer cause natural regeneration failure of oaks: Six decades of landscape-scale evidence2019Inngår i: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 444, s. 299-307Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Many tree species worldwide are suffering from slow or failed natural regeneration with dramatic consequences for biodiversity and ecosystem services. However, it is difficult to disentangle the complex effects of factors influencing regeneration processes on long-lived tree species at large scales. In this study, we use long-term data from the Swedish National Forest Inventory (1953-2015) combined with deer hunting data (1960-2015) to reveal experimentally-intractable processes impeding oak (Quercus spp.) regeneration in southern Sweden. Oak-dominated ecosystems are widespread in northern temperate regions, where oaks are foundation species with disproportionate importance for biodiversity and ecosystem functions. Our study reveals that during the last six decades, oak tree numbers and standing volume have continuously increased, while natural regeneration of oak declined steeply after the early 1980s. We connect this decline to denser and darker forests, combined with increased abundance of deer. Land use changes during the six decades, such as abandonment of traditional practices and large-scale introduction of forest management oriented towards high volume production, led to continuously denser forests and thereby reduced the oak regeneration niche. In addition, the impact of changed game management was evident. This was particularly clear from a natural experiment on Gotland, a large island free of deer until roe deer were introduced in the late 20th century, at which point oak regeneration began a steep decline. At the stand level, natural oak regeneration could be expected to mainly occur in pulses after disturbance events, followed by a period of low regeneration success as the cohort ages. However, at a landscape scale one would expect a mix of successional stages that would even out such demographic patterns. A prolonged period of low regeneration at a landscape scale will eventually lead to a large gap in the oak size distribution as was observed in this study. This could eventually hurt the many species dependent on old and large oak trees. Active management to restore the oak regeneration niche, i.e. forest habitats with more light and less browsing pressure, therefore seems essential. The latter includes developing strategies that manage both deer populations and their available food across landscapes. Our study is the first to link oak regeneration failure to long-term changes in land use and increased deer populations at a landscape scale in this region. Furthermore, our study show how historical data can clarify confounded processes impacting long-lived forest species.

  • 8.
    Scharis, Inger
    et al.
    Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Institutionen för fysik, kemi och biologi.
    Rasmussen, Gregory S. A.
    Painted Dog Conservation, Hwange National Park, PO Box 72, Dete, Zimbabwe.
    Laska, Matthias
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska fakulteten.
    Using morphometrics to quantitatively differentiateAfrican wild dog footprints from domestic dogfootprints – a pilot study2016Inngår i: African Journal of Ecology, ISSN 0141-6707, E-ISSN 1365-2028, Vol. 54, nr 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Reliable population estimation and species inventories areimportant for wildlife conservation, but such estimationsare often difficult due to unreliable identification of thespecies in question. Furthermore, for predator conflictresolution, it is essential to be able to reliably identify thepredator. This study presents a new method to quantitativelydistinguish African wild dog (Lycaon pictus) footprintsfrom feral domestic dog (Canis lupus familiaris)footprints. Footprint photographs were digitally processedusing Photoshop and the NIH image processing softwareImageJ, and total pad area and angles between thecentroids of the backpad and the digits of the paw weremeasured. Pad angles showed statistically significantdifferences between the two species and, with the exceptionthat there was no significant difference in pad areabetween African wild dog females and domestic dog males,total pad areas were also diagnostic. Consequently, thecombination of total pad area and the angle betweenbackpad and digits are useful discriminators to reliablyidentify the species from an unknown footprint.

  • 9.
    Stavrinidou, Eleni
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Gabrielsson, Roger
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Gomez, Eliot
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Crispin, Xavier
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Nilsson, Ove
    Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 87 Umeå, Sweden..
    Simon, Daniel T.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Electronic plants2015Inngår i: Science Advances, ISSN 2375-2548, Vol. 1, nr 10, s. 1-8, artikkel-id e1501136Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The roots, stems, leaves, and vascular circuitry of higher plants are responsible for conveying the chemical signals that regulate growth and functions. From a certain perspective, these features are analogous to the contacts, interconnections, devices, and wires of discrete and integrated electronic circuits. Although many attempts have been made to augment plant function with electroactive materials, plants’ “circuitry” has never been directlymerged with electronics. We report analog and digital organic electronic circuits and devices manufactured in living plants. The four key components of a circuit have been achieved using the xylem, leaves, veins, and signals of the plant as the template and integral part of the circuit elements and functions. With integrated and distributed electronics in plants, one can envisage a range of applications including precision recording and regulation of physiology, energy harvesting from photosynthesis, and alternatives to genetic modification for plant optimization.

  • 10.
    Svensson, Teresia
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Measurements and fluxes of volatile chlorinated organic compounds (VOCl) from natural terrestrial sources: Measurement techniques and spatio-temporal variability of flux estimates2019Rapport (Annet vitenskapelig)
    Abstract [no]

    Flyktiga organiska föreningar (VOC) och i synnerhet klorerade VOCs (VOCls) betraktas som miljö­farliga ämnen i vattenmiljöer på grund av sina toxiska egenskaper, men även i atmosfären eftersom de har en stor inverkan på atmosfärskemin, t ex genom att påverka ozonskiktet. Ett antal studier har hittat flera naturliga källor för VOCl och därmed förändrat synen på VOCls som endast producerade av människor. Trots det så saknas kunskaperna fortfarande om utsläpp de naturliga flödena av VOCls, särskilt när det gäller variation i tid och rum från terrestra miljöer. I kärnkraftsindustrin är Cl­36 en dosdominerande radionuklid för en del avfallströmmar. Därför behövs en bättre förståelse för omsättningen av klor i ytnära ekosystem.

    Klormetan är den mest studerade av VOCl och den näst mest studerade är kloroform. Några andra studier har uppskattat flöde av andra VOCl som tetraklormetan (CCl4), metylkloroform (CH3CCl3), tetrakloretan (C2H2Cl4), freoner (CFC), kloretan (C2H5Cl), bromodiklormetan (CHBrCl2). Studier genomfördes i klimat och markbaserade ekosystem som sträcker sig från arktisk tundra till tropisk regnskog, men de flesta studier fokuserar på tempererat klimatområde. Våtmarker och kustsystem är de studerande dominerande ekosystemen. Kammare är den vanligaste metoden för att uppskatta flöden av av VOCls, men det finns också några studier med koncentrationsgradienter i markprofiler, och en form av mikrometeorologimetodik. De metodologiska osäkerheterna som diskuteras kretsar i första hand kring kontamination, få replikat, design av fältmätningar och fältmätningarnas påverkan på markprocesser och därmed indirekt på flödena. Trots de många utmaningarna för att mäta VOCls och uppskatta flödena är det klart att flödet av klor till atmosfären är ett viktigt flöde i klors biogeo­kemiska cykel i terrestra ekosystem. Skogsekosystem kan avge så mycket som 0.1 g m–2, vilket är 40 % av våtdepositionen av klorid och det finns studier som tyder på att våtmarker är en långt mycket större källa till klor i atmosfären än man tidigare trott.

1 - 10 of 10
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf