27 resultados para Forestry pest
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XVIII IUFRO World Congress, Ljubljana 1986.
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XVIII IUFRO World Congress, Ljubljana 1986.
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XVIII IUFRO World Congress, Ljubljana 1986.
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XVIII IUFRO World Congress, Ljubljana 1986.
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XVIII IUFRO World Congress, Ljubljana 1986.
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XVIII IUFRO World Congress, Ljubljana 1986.
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Metsäteollisuudesta kertyy vuosittain suuria määriä ylijäämämateriaalia, kuten puun kuorta ja oksia.Ylimääräinen aines käytetään pääasiassa energiantuotantoon, mutta uusia soveltamismahdollisuuksia kaivataan. Kuoren on havaittu olevan potentiaalinen lähde monille bioaktiivisille yhdisteille, joille olisi käyttöä esimerkiksi lääke- ja kemianteollisuudessa sekä maa-, metsä- ja puutarhatuotannon tuholaistorjunnassa. Tutkimus on osa Euroopan Unionin rahoittamaa ForestSpeCs-projektia, jonka tarkoituksena on selvittää metsäteollisuuden ylijäämämateriaalien vaihtoehtoisia käyttötapoja. Valittujen kymmenen teollisesti merkittävän pohjoisen puulajin (Abies nephrolepis, Betula pendula, Larix decidua, L. gmelinii, L. sibirica, Picea abies, P. ajanensis, P. pumila, Pinus sylvestris, Populus tremula) kuoresta uutettujen aineiden soveltuvuutta syönninestoaineeksi testattiin kaaliperhosen (Pieris brassicae L.) ja krysanteemiyökkösen (Spodoptera littoralis Boisduval) toukilla sekä osittain sinappikuoriaisella (Phaedon cochloreae Fabricius) ja idänlehtikuoriaisella (Agelastica alni L.). Uutteet valmistettiin yhteistyössä projektin ryhmien avulla tai itsenäisesti erilaisin menetelmin. Testaukset tehtiin laboratorio-oloissa käyttäen lehtikiekkojen valintabiotestiä sekä karkeilla uutteilla että niistä erotelluilla yksittäisillä yhdisteillä. Tehdyistä mittauksista laskettiin syönninestoindeksit (FDI). Tulosten perusteella lähes kaikki testatut uutteet vaikuttivat ainakin jossain määrin kohdehyönteisen syöntikäyttäytymiseen. Hieman yli puolet kaaliperhosella testatuista 46 uutteesta aiheuttivat yli 50 % syönnineston eli kaaliperhonen suosi kontrollilehtiä uutteella käsiteltyjä todennäköisemmin. Krysanteemiyökkösellä yli 50 %:n syönnineston aiheuttivat vain seitsemän testatuista 56 uutteesta. Lisäksi kolme uutetta lisäsi käsiteltyjen kiekkojen syöntiä merkittävästi. Idänlehtikuoriaistoukat ja -aikuiset karttoivat erityisesti abietiinihapolla käsiteltyjä lehtiä. Sinappikuoriaisella testatut uutteet toimivat myös lupaavasti. Testattujen puulajien kuoresta on mahdollista uuttaa biologisesti aktiivisia yhdisteitä, mutta tuholaistorjunnan kannalta oikeiden pitoisuuksien ja tehokkaiden uuttomenetelmien löytäminen vaatii jatkotutkimuksia. Kuoren sisältämien yhdisteiden laatu ja määrä vaihtelevat monien tekijöiden, kuten ympäristön ja genetiikan vaikutuksesta. Hyönteisten sietokyky vaihtelee myös paljon lajeittain ja yksilöidenkin välillä on eroja. Uutteista valmistettavia torjunta-aineita olisi kuitenkin mahdollista sisällyttää esimerkiksi integroituun torjuntaan muiden menetelmien rinnalle tulevaisuudessa.
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The purpose of this study was to examine the integrated climatic impacts of forestry and the use fibre-based packaging materials. The responsible use of forest resources plays an integral role in mitigating climate change. Forests offer three generic mitigation strategies; conservation, sequestration and substitution. By conserving carbon reservoirs, increasing the carbon sequestration in the forest or substituting fossil fuel intensive materials and energy, it is possible to lower the amount of carbon in the atmosphere through the use of forest resources. The Finnish forest industry consumed some 78 million m3 of wood in 2009, while total of 2.4 million tons of different packaging materials were consumed that same year in Finland. Nearly half of the domestically consumed packaging materials were wood-based. Globally the world packaging material market is valued worth annually some €400 billion, of which the fibre-based packaging materials account for 40 %. The methodology and the theoretical framework of this study are based on a stand-level, steady-state analysis of forestry and wood yields. The forest stand data used for this study were obtained from Metla, and consisted of 14 forest stands located in Southern and Central Finland. The forest growth and wood yields were first optimized with the help of Stand Management Assistant software, and then simulated in Motti for forest carbon pools. The basic idea was to examine the climatic impacts of fibre-based packaging material production and consumption through different forest management and end-use scenarios. Economically optimal forest management practices were chosen as the baseline (1) for the study. In the alternative scenarios, the amount of fibre-based packaging material on the market decreased from the baseline. The reduced pulpwood demand (RPD) scenario (2) follows economically optimal management practices under reduced pulpwood price conditions, while the sawlog scenario (3) also changed the product mix from packaging to sawnwood products. The energy scenario (4) examines the impacts of pulpwood demand shift from packaging to energy use. The final scenario follows the silvicultural guidelines developed by the Forestry Development Centre Tapio (5). The baseline forest and forest product carbon pools and the avoided emissions from wood use were compared to those under alternative forest management regimes and end-use scenarios. The comparison of the climatic impacts between scenarios gave an insight into the sustainability of fibre-based packaging materials, and the impacts of decreased material supply and substitution. The results show that the use of wood for fibre-based packaging purposes is favorable, when considering climate change mitigation aspects of forestry and wood use. Fibre-based packaging materials efficiently displace fossil carbon emissions by substituting more energy intensive materials, and they delay biogenic carbon re-emissions to the atmosphere for several months up to years. The RPD and the sawlog scenarios both fared well in the scenario comparison. These scenarios produced relatively more sawnwood, which can displace high amounts of emissions and has high carbon storing potential due to the long lifecycle. The results indicate the possibility that win-win scenarios exist by shifting production from pulpwood to sawlogs; on some of the stands in the RPD and sawlog scenarios, both carbon pools and avoided emissions increased from the baseline simultaneously. On the opposite, the shift from packaging material to energy use caused the carbon pools and the avoided emissions to diminish from the baseline. Hence the use of virgin fibres for energy purposes, rather than forest industry feedstock biomass, should be critically judged if optional to each other. Managing the stands according to the silvicultural guidelines developed by the Forestry Development Centre Tapio provided the least climatic benefits, showing considerably lower carbon pools and avoided emissions. This seems interesting and worth noting, as the guidelines are the current basis for the forest management practices in Finland.
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The aim of the research is to interpret the professional culture of Finnish university-educated foresters in historical perspective. The main material of this research consists of biographical interviews, altogether 226 life stories of Finnish foresters, as well as foresters private photograph collections and articles in forest students' magazines. This study is the first published Ph. D. dissertation of a large oral history project "Forestry Professions in a Changing Society" 1999 2002 collected by The Finnish Forest History Society, the University of Helsinki (Ethnology) and The Finnish Forest Museum Lusto. The forester education was organized in the Evo Forest Institute 1862 1908, at the University of Helsinki since 1908 and additionally at the University of Joensuu since 1982. At first all the vacancies were in the service of the Board of Forestry, but during the 20th century the working opportunities of foresters significantly expanded, even outside the traditional areas of forestry or abroad. At the same time the whole area of Finnish forestry had integrated more versatile values concerning the forests and their use. The male-dominated profession gained its first female members already in the 1920s, and the number of female students rose gradually from the 1970s onwards. In the 1990s almost half of the new forest students were women. The content of both work and education of Finnish forest professionals has faced huge changes during the 19th and 20th centuries. Despite this however, there has been a long-term vision of a firm profession based on joint experiences, shared memories and the common task of foresters in the Finnish forestry. The feeling of togetherness the forester spirit which was created in a tight-knit student group which kept in touch also later as professionals was needed to make the work possible. Through foresters' own attitudes and narratives of themselves, the study is focused on forest professionalism as a cultural process of successive generations of foresters. How have foresters socialized themselves into their profession? How has forest professionalism been maintained? What is the meaning of joint experiences and shared memories in the profession? By studying the manifestations of a culture it is possible to interpret the culture itself. There seems to be an astounding consensus of opinion concerning forest professionalism in the oral, visual and written stories of foresters. Even if all the individuals and some separate groups, such as female foresters and the younger generation of foresters, did not always share the same experiences, the vision of forest professionalism was collectively recognized and often even approved. The shared idea of "a real forest professionalism" is like a model narrative, a point of comparison, which is needed while looking for one s own professional identity.
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From Provincial Institutes to the University. The Academisation Process of the Research and Teaching of Agricultural and Forest Sciences at the University of Helsinki before 1945. This study focuses on the teaching and research conducted in the Faculty of Agriculture and Forestry at the University of Helsinki, as well as in its predecessor, the Section of Agriculture and Economics before 1945. The study falls into the field of university history. Its key research question is the academisation process, an example of which is the academisation process of the teaching and research of agricultural and forest sciences in Finland. From a perspective of university history, the study looks at academisation as the beginning of university-level teaching and research in these fields, or their relocation to a university or another institute of university standing. In addition to the above, the academisation process also includes the establishment of the position of the subjects and their acceptance as part of university activity. Academic closure, on the other hand, prevents the academisation of new subjects. In Finland, the preliminary stage of the academisation of the research and teaching of the agriculture and forestry was the Age of Utility, when questions concerning the subjects became part of clerical and civil service training at the Royal Academy of Turku in the mid-18th century. In the mid-19th century, as a result of social and economic development, agricultural and forestry professionals needed more theoretical professional training. At that time, the Imperial Alexander University was focused on traditional professional training and theoretical education, so, because of this academic closure, practical training for agronomists and foresters was organised at first outside the University at the Mustiala Agricultural Institute and the Evo Forest Institute. In the late 19th century, discussion began on the reform of higher agricultural and forestry education. This led, from the 1890s, to the academisation of higher agricultural and forestry education and research at the Alexander University. Academisation was followed by a transitional stage, during which the work of the Section of Agriculture and Economics, which had begun in 1902, became more established in about 1910. The position of the agricultural and forest sciences was, however, largely temporary, because of the planned Agricultural University. A sign of this establishment and of the rise in scientific status of the subjects was the commencement of operations of the Faculty of Agriculture and Forestry in 1924. Furthermore, as a consequence of the development of the subjects and the collapse of the Agricultural University project, agricultural and forest sciences gradually began to be accepted at the University of Helsinki from the end of the 1920s. This led to the allocation of sites for the faculty buildings and research farms, and to the building of ‘Metsätalo’ before the Second World War. Key words: academisation, academisation process, academic closure, university history, University of Helsinki, Faculty of Agriculture and Forestry, agricultural sciences, forest sciences, agronomy training, forestry training
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A sense of community as a resource for developing university teaching and learning The aim of this doctoral research was to determine how a sense of community can be a resource for developing university teaching and learning. The theoretical background is linked to social sciences, social psychology, university pedagogy and educational sciences. The thesis is comprised of two separate studies. Study I consisted of an action research project in which a model of cooperatively developing a teaching and learning culture was created and tested. The focus of study I was the university pedagogy programme of the Faculty of Agriculture and Forestry. The results demonstrated that the theoretical framework and the methods of cooperative learning provide useful tools for developing an academic learning and teaching culture. The approach helps to create a benevolent learning atmosphere. The cooperative learning culture used in the action research project reflected the traditional academic learning culture and also caused a collision between the two cultures. The aim of study II was to determine how Open University students and Bachelor’s degree students experience their teaching-learning environment and the importance of the learning community and peer support to their studies. The results indicated that, with the exception of support from other students, the Open University students experienced their teaching-learning environments on average more positively than the Bachelor’s degree students. According to the Open University students, their own motivation and interest was the most important factor that enhanced studying. Furthermore, the most common factors delaying their studies were their life situation and a lack of time. The sense of community and social relations mainly promoted studying. Open University students experienced that they were supported by their teachers, tutors, other students, the working community, family and hobbies. The research demonstrated that the methods that make good use of communal resources are negotiation of shared goals and rules, working in various small groups, emphasis on shared and individual responsibilities and assessment of the product and the process of learning. The resources of the academic community can be developed if the members of the community develop, in addition to the communal working methods, their communal sensitivity. In other words, they should have an understanding of social psychological and sociological concepts that they can use for observing communal phenomena.
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In this Master's Thesis I study guidance practises, which facilitate first year students' integration into the university. Besides formal guidance, for example tutoring and peer tutoring, general student advising and introduction courses, I address my research to informal everyday guidance practices. I aim to highlight existing supportive practices, which are meaningful from the university students' perspective. My aim is to study what kind of guidance practises exists in university and how these practises support first year student. The aim of the guidance practises is to facilitate new university student to integrate into the academic community. I study the implementation of this aim as a development of an academic identity, which requires that students have an opportunity for guided participation in academic practises. The research is based on phenomenological-hermeneutic research tradition, and my aim is to produce information of students' everyday experiences and meanings. My informants were students of agriculture and forestry at University of Helsinki. I gathered research material utilizing the critical incident technique in 11 theme interviews, which I carried out with individuals, pairs or small groups. During interviews I asked the students to describe and evaluate their first year guidance experiences, especially those that were extreme positive or negative. Based on my research I specified four meaningful guidance practices: care of students, transparency of the practises of the learning community, presence of guidance in everyday activities of a student and communal reflection to studies. I represent the character and components of the guidance practises, and I also describe the meaning of those practises to university students. Keywords: Guidance practices, guidance, first year studies, academic community, integration, academic identity,critical incidents