Global ETD Search

1	THE POTENTIAL OF BIOCHAR TO ENHANCE ENVIRONMENTAL SUSTAINABILITY IN SWEDEN Pensulo, Chibesa January 2012 (has links) Environmental sustainability in Sweden is challenged by rising greenhouse gas emissions from transportation, input-intensive agriculture and potentially unsustainable removal of organic material from forests and farmland. The Swedish government is working towards sixteen environmental quality objectives in order to overcome these problems, among others. The past decade gave rise to an international research community dedicated to investigate the age-old practice of applying charcoal to soil, practiced most notably by ancient civilisations in the Amazon region of South America. The high level of interest and controversy around this subject inspired this investigation of biochar’s potential benefits in Sweden. A scientific study was conducted to examine the potential of biochar to enhance environmental sustainability in Sweden. This was largely a desk study, supplemented by expert interviews, GIS map work, an experiment and mathematical analysis. It was found that there was insufficient research to date to prove the agronomic benefits of biochar in Sweden. More field studies are required to build up the evidence of its potential. Furthermore, as the rate of mineralization of the carbon content is dependent on numerous factors, including the composition of the soil to which the biochar is applied, it is difficult to conclusively define biochar’s carbon storage potential. This study adds to the existing body of knowledge on the subject by integrating the conclusions from a variety of studies and expert opinions, as well as by providing maps indicating land areas in Sweden that would be likely to benefit from biochar application. Sustainable development biochar bioenergy environmental sustainability climate compensation soil organic matter content agricultural productivity
2	Exploring the impact of Formica exsecta ants on soil properties above the tree line in northern Sweden / Studie av effekterna av Formica Esecta myror på markegenskaper över trädgränsen i norra Sverige Pekkari Juto, Filip January 2023 (has links) Ants are considered ecosystem engineers due to their effect on the soil properties and their ability to alter the flow of energy and nutrients. Many studies have focused on ants in boreal forests,but few have focused on the ant’s effect on the tundra. This study focuses on Formica exsecta mounds effect on soil properties above the tree line in the Abisko area. Soil moisture and soil temperature were measured in the field while organic matter content and gravimetric moisture content were measured in the lab. 113 soil samples from the summer of 2021 and 2022 were analysed. The samples were taken from inside the mound and from three distances from the mound. I found a significant difference both in nest moisture and nest temperature in the mound compared to the soil outside the mound.However, I found no significance for organic matter content at the different distances from the mound or for the gravimetric moisture content. Soil temperature and soil moisture is clearly impacted by the ant mounds, but it is not clear how far from the mound it affects the soil. / <p>Rapporten var mycket välskriven, och du gör ett bra jobb med att sätta in projektet i en vetenskaplig kontext i inledningen, med många referenser till den vetenskapliga litteraturen. Metoddelen beskriver provtagning och analyser på ett bra sätt, men vissa steg är det ibland lite svårt att följa: Hur stor volym jord provtogs på varje plats, och hur togs provet under stacken för att inte störa myrorna? I resultaten räcker det att konstatera att signifikanta samband saknades, det negative R2-värdet var mycket nära noll, och visar främst att modellen inte förklarade någon variation i data. Förklara också vad en boxplot visar i figurtext. I diskussionen eller inledningen hade jag gärna sett något omnämnande av myrornas habitatval för sina stackar och hur det kunde påverka tolkningen av eventuella skillnader i markförhållanden med avstånd från stacken. </p><p>Din presentation hade bra slides som beskrev design och resultat väl. Du pratade ganska tyst i början, men du hördes väl. Jag tyckte att det var bra att du diskuterade dina resultat i ett diskussionsavsnitt, där många andra hopade direkt från resultat till slutsatser.</p><p>Dina svar på opponentens frågor visade att du satt dig in grundligt i myrornas ekologi och ekosystemeffekter, och att du vänt och vridit på analyserna, det blev en bra vetenskaplig diskussion. Du var också bra på att sätta in frågorna i ett mer generellt sammanhang genom att referera till den vetenskapliga litteraturen. Din opponering var också bra, med frågor både på metod och resultat, med förslag på ändringar</p><p>Rapporten var välskriven och med stark anknytning till det vetenskapliga kunskapsläget men inte lika tydlig i presentation av metoder och resultat. Du visar dock att du behärskar ämnet väldigt bra och kan sätta in resultaten i ett större sammanhang.</p> Formica exsecta ant mounds soil properties organic matter content tundra Ecology Ekologi
3	Posouzení kvality půdy zpracované klasickým způsobem ve vybrané lokalitě v Olomouckém kraji / Assessment of soil quality processed with conventional tillage in the selected site in the Olomouc region Drlíková, Barbora January 2017 (has links) Diploma thesis documents the problems of soil quality, which is assessed on the basis of physical, chemical or biological indicators of soil quality. The paper describes the various indicators, its methodology and evaluation. In the practical part evaluates the quality of soil cultivated with the traditional way - using plowing. The experimental area, where the samples were taken from the soil, lies in the Olomouc region in the municipality Šumvald. Evaluated were selected physical, chemical and physico-chemical properties of soil, e.g. particle size distribution, bulk density, porosity, air capacity, hydrolimits, pH, carbonates, humus content and salinity of the soil.
4	Digital Soil Mapping of the Purdue Agronomy Center for Research and Education Shams R Rahmani (8300103) 07 May 2020 (has links) This research work concentrate on developing digital soil maps to support field based plant phenotyping research. We have developed soil organic matter content (OM), cation exchange capacity (CEC), natural soil drainage class, and tile drainage line maps using topographic indices and aerial imagery. Various prediction models (universal kriging, cubist, random forest, C5.0, artificial neural network, and multinomial logistic regression) were used to estimate the soil properties of interest. Agricultural Land Management Agricultural Land Planning Sustainable Agricultural Development Agronomy Digital soil mapping (DSM) Organic matter content Cation exchange capacity Natural soil drainage classes geostatistical methods Cubist modeling Random Forest models Universal Kriging C5.0 or see5 modeling Artificial neural network Tile drainage lines Soil spatial variation Plant Phenotyping Aerial Imagery digital elevation model (DEM) terrain attributes Soil and Landscape Very poorly drained poorly drained somewhat poorly drained moderately well drained User's accuracy producer's accuracy kappa coefficient Multinomial logit regression Tile Probe topographic wetness index Topographic Position Index slope height cross sectional curvature Relative slope position channel network distance SSURGO soils data internal validation external validation

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