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997 Uppsatser om Structural soil - Sida 11 av 67
Evaluation of an ectomycorrhizal macrofungi as an indicator species of high conservation value pine-heath forests in northern Sweden
Since the 1950s, the development of modern rotation forestry in boreal Fennoscandia has resulted in a severe reduction of older forests, and a high degree of fragmentation among the small patches that remains of old forest. In Sweden, when performing conservation value assessments in order to identify and preserve the remaining forest habitats, the government authorities use to a significant extent a set of indicator species that indicate habitats of high biological conservation value. One species considered to indicate high conservation values in pine-heath forests is the red-listed ectomycorrhizal (EM) macrofungi Sarcodon scabrosus (Fr.) P. Karst. In the present study, the validity of using S.
Kan markfuktighetskartor användas för att hitta skogsmark med hög bonitet? : ett gis-baserat försök med dtw-index och laserskannad övre höjd
The depth-to-water-index (DTW-index) is derived from digital elevation models (DEM) to map soil wetness, in terms of distance from soil surface to the ground water table. The aim of this GIS based study was to investigate the existence of a relationship between DTW-index and forest site productivity (SP). The belief of such an assumed relationship was based on knowledge that the ground water level is related to site properties that can either promote or impede tree growth.
Data primarily comprised rasters of the Krycklan catchment in northern Sweden and depicted DTW-index and a laser scanned vegetation height. The 100th height percentile of each pixel in the vegetation raster was assumed to mirror the top-height, letting it act as a relative measure of SP within a delineated area of equal stand age.
Fältdiagnostik - ett verktyg för hållbar odling : Resultat och tillämpning av fältdiagnostiska metoder i planeringsstadiet av en ny trädgårdsblåbärsodling
I det här arbetet undersöks fältdiagnostiska metoder och användbarheten av dess resultat i planeringsstadiet av en ny trädgårdsblåbärsodling. Syftet är att fastställa vilken information som kan erhållas från en jordanalys, penetrometerundersökning och en jordmånsbeskrivning samt vilka rekommendationer från dessa undersökningar som vidare kan härledas till planeringen av en ny trädgårdsblåbärsodling. Som exempel och fallstudie används en bit åkermark i Ockelbo där provmätningarna ägde rum.Resultatet visar att fältundersökningar i kombination med en jordanalys gjord på laboratorium är ett bra verktyg för att utreda en jords grundläggande förutsättningar. Jordanalysen visar hur näringsinnehållet ser ut i jorden samt vilka eventuella näringsbrister eller näringsöverskott som finns. Penetrometerundersökningen informerar om eventuella markpackningar, som utgör eventuella hinder för t.ex.
Texturbestämning genom fält-, pipett- och hydrometermetoder :
Texture is an important soil property and accurate particle size analysis of soil texture is therefore crucial. There are a number of well-established and newly developed methods available for determining soil texture. In order to compare the results of these methods, the differences between them must be determined.
The difficulties, problems and differences regarding texture class determination were examined through a study performed on forest soil samples. The study compared different methods (pipette, hydrometer and field methods) and two types of dispersing agents (sodium pyrophosphate and sodium hexametaphosphate (calgon)) commonly used for particle size analysis.
Valet inför valet : En studie om hur svenska förstagångsväljare väljer att ta del av politisk information
Problem statement and purpose:The purpose of this study was to analyze in what way first-time voters chose to take part of political information. The questions we aimed to answer was how first-time voters use media and other information channels for political purposes, what importance and trust the first-time voters give the different information channels and finally which indicators there is for that structural or individual factors affect the media consumption and political interest.Method and material:We did interviews with twelve 18 years old first-time voters from six different high school programs in Sundsvall, Sweden.Results:The study showed that the premier source of political information were traditional news media, in particular the debates on TV. It?s also in the debates the first-time voter?s trust the most. Even though the social medias are constantly present in their everyday life and even though the first-time voters believe the social medias have potential for engaging young people politically, the possibilities are only taken in advantage by people who are already politically interested.
The Key Success Factors of Grameen Bank - A Case Study of Strategic, Cultural and Structural Aspects
The thesis aims to analyze strategic, cultural and structural aspects of Grameen Bank and its micro-credit project, in order to identify key success factors. A case study was performed with an inductive and qualitative approach, using semi-structured interviews. The data was collected by field observations and interviews on site in Dhaka, Bangladesh and surrounding areas.The main conclusion is that the critical success factor of Grameen Bank is the relationship focus, guiding and aligning its strategy, culture and structure. Also, local offices have been observed to utilize practices not permitted by the bank?s management, ultimately increasing the organizational efficiency..
90-talskrisens effekter p? syssels?ttningsstrukturen f?r Lund och Malm?
The employment structure consists of different sectors, whose share of the total employment rate is all part of an economic structural conversion according to this thesis applied theoretical approach. A structural conversion, which consist of recurring crises, such as the financial crises in the early 1990s. This crisis and its effect on the Swedish economy is well-documented, while the shortage regarding the effect on a smaller scale, in a local and regional context, provides this thesis purpose. More specifically, a comparison between the two neighbouring towns of Malm? and Lund, will constitute the local contexts in this research.
Kortsiktig fosforeffekt av avloppsslam : krukförsök i växthus där järn-, aluminium- respektive kalkfällt slam använts som fosforgödselmedel
The short term effect of phosphorus in sewage sludge was investigated to establish howmuch of this a farmer can grant him- or herself, if using sewage sludge as a phosphorusfertilizer. Possible differences in plant availability between sludge phosphorus precipitatedby iron, aluminum or calcium integrations were studied in a sandy soil at two pH levels.The sludges were analyzed using pot and incubation trials. As the intention was to investigategrowth limitation due to phosphorus deficiency, a soil with low phosphorus supplywas chosen as well as a low phosphorus application rate. Sludge corresponding to 12kg phosphorus per hectare was applied. Treatments fertilized by sludge were compared totreatments where 0, 6 and 12 kg phosphorus per hectare from mineral fertilizer was applied.Every treatment was replicated six times.
Varierad kaliumgödsling i potatis : en fältstudie i Hedemora
Variation in tuber quality within a single field was one of the motives for a pilot study
in Halland, in south-western Sweden conducted during 2002. Quality problems in potatoes have been increasing due to the aggregation of several small fields with different land use history into larger farm units, which are heterogeneous in soil properties and fertility. The study in Halland indicated that both the uniformity and the mean size of tubers may increase from site-specific K fertilization, whereas total yields may be unaffected. The results from this pilot-study with site-specific fertilization showed that tubers reached a more uniform quality and gave a more uniform mean size, while the total yield wasn't affected at all.
Site-specific K-fertilization has been applied for some years in Halland with good
results. The aim of this study was to test this technique in another potato growing
area.
Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren
The water level of Lake Mälaren has been regulated since the 1940?s. A recentinvestigation suggests that the current regulation needs to be adjusted in order toprevent a decline in water level, salt water from infiltrating from Lake Saltsjön,and risk of floodings. In addition to these preventions, the new regulation couldpotentially effect the natural environment and agriculture practices in the lowlands that surround the lake. The new regulation proposal calls for an increase invariations in Mälaren?s water level during seasons, while the annual mean waterlevel will remain the same.
Integrationens paradoxer : En intervjustudie av integrationen i praktiken
The purpose of this study is to examine the relations of power within the discourse of integration and my focus will be on power relations and structural discrimination. The study origins from four qualitative interviews with employees from the County administrative board as well as from the Employment office.The theoretical framework is based upon Social Constructionism, Postcolonial Theories and with an intersectional perspective. The recent critical research from The Official Report on power, integration and structural discrimination (Utredningen om makt, integration och strukturell diskriminering) is used as well as Foucault's theory of biopower which is discussed within the analysis.The study indicates that although integration often is addressed as a reciprocal process, it is still assumed that They should be integrated by Us. The present government's one-sided focus on employment has proved difficult for the employees to put into practise and when the responsibility of obtaining employment is based upon the individual alone, she/he becomes responsible for her/his own integration..
Kan det vara hypertext? Ett försök att analysera en månglineär, flersekventiell pappersburen text som hypertext
The object of this thesis is to discuss the limits of the hypertext concept. The issue is whether the concept of hypertext necessarily depends on the conditions of the electronic media and www, or if the concept of hypertext more likely is founded on certain textual structures and strategies. In the light of contributions to hypertext theory during the 1990s, this thesis compares different views on hypertext, and concludes with an evaluation. The poem it the authors own translation of the original Danish title det, written in 1969 by the system-poet Inger Christensen, is the object of this case study. The poem is analysed with respect to its structural organisation and literary composition.
Effekt av olika kvävegödselmedel på utvecklingen av klumprotsjuka i salladskål (Brassica rapa ssp. pekinensis)
The price trend on rapeseed the latest years has led to an increasing interest to grow the crop among many farmers in Sweden. The price trend has resulted in more than a doubling of the oilseed area since the early 2000s. For many farmers it is an advantage to increase cultivation of rapeseed because of the high proportion of cereals in the crop rotation on many farms, but it is not just benefits. The risk of the fields being infected by clubroot increases within frequent rapeseed cultivation and it often leads to subtantial economic losses. Clubroot is caused by Plasmodiophora brassicae that is a soilborne pathogen in genus Protozoa and its resting spores can be found in the soil for up to 18 years.
Erfarenheter av utedrift med köttdjur i Sverige och Kanada :
Beef cattle wintering outdoors should be provided a shelter, e.g. a type of barn or corresponding. This type of production requires appropriate soil types and secured animal welfare. For example, a clean and dry resting place needs to be provided to the animals. To receive an exemption for buildings the farmer has to have something equivalent that provides an adequate shelter.
Effekten på nedbrytningen av rötter vid tillförsel av ammonium sulfat i en granskog i sydvästra Sverige
Decomposition of organic matter is a critical process in the ecosystem, which involves many essential biotic and physical parts. Decomposition is therefore an important process both above and below ground. The rate of decomposition is dependent of many environmental factors for example: pH, moisture and supply of oxygen. The decomposition can therefore be affected by large scaled environmental influences, such as acidification and climatic changes. The root litter in the forest is in different ways affected by acidification, liming and manuering.