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Im Forschungsfeld Klimaschutz und Nachhaltigkeitszertifizierung werden in dieser Arbeit die Treibhausgasemissionen durch Verwendung von Rapsbiodiesel gemäß EU Nachhaltigkeitsvorgaben der EU RED thematisiert. Regionales Bezugssystem sind gemäß EU-Vorgabe die NUTS2-Gebiete. Für 35 NUTS2-Regionen Deutschlands wurden Treibhausgasemissionen, die dem praxisnahen Rapsanbau zugerechnet werden können, berechnet.
Ein entwickeltes sogenanntes Rechenmodul mit dem Rapsanbauverfahren von der Bodenbearbeitung über die Düngung erfasst, beinhaltet einen vom Ifeu-Institut erschaffenen THG-Rechner, der die THG-Emissionen gemäß IPCC-und RED-Vorgabe berechnet. Um zwei Forschungslücken zu schließen, wurden mithilfe des Rechenmoduls insbesondere die Differenzierung der Stickstoffdüngung und die Regionalspezifik von Rapsanbauverfahren beschrieben. Zentraler Parameter ist die Düngung, mit Unterscheidung üblicher Stickstoffmineraldünger, und zusätzlich im Rechenmodul implizierte Wirtschaftsdünger. Die eigentliche Modellierung typischer regionaler Rapsanbauverfahren für 35 NUTS2-Gebiete mit 10 erforderlichen Anbauparametern erfolgte mit der Unterstützung und dem Fachwissen regionaler Experten der Landeseinrichtungen für Landwirtschaft. Folgende Ergebnisse werden dargestellt:
o Quantifizierung der THG-Anbauemissionen definierter Rapsanbauverfahren.
o Quantifizierung der entsprechenden Stickstoffsalden unter Berücksichtigung der Anrechenbarkeit des Stickstoffs aus Wirtschaftsdünger nach Vorgaben der Dün-geverordnung.
o Wirtschaftlichkeit definierter regionaler Rapsanbauverfahren.
o Modellierung von Minderungsverfahren nach Expertenrat.
o Rechenbeispiel Mecklenburg-Vorpommern – Optimierungsvariante nach Dün-geverordnung
o Einschätzung der Erreichbarkeit des Untersuchungszielwerts im Modell.
o Die von der EU gewünschte räumliche Bezugsgröße NUTS2-Region erfordert Durchschnittswerte für unterschiedlich große Gebiete.
o Mit dem entwickelten Rechenmodul sind Anbauverfahren und die erforderlichen Rechengrößen präziser bestimmbar und einzelbetrieblich planbar.
Die THG-Verminderung ist mit folgenden drei Stellschrauben möglich:
(1) N-Düngung (N2O-Feldemissionen) - Mineraldünger (die Vorkettenemissionen implizieren) sind möglichst zu vermindern und am Bedarf gemäß Düngeverordnung zu orientieren (auch um hohe N-Salden zu vermeiden),
(2) Wirtschaftsdünger (generell ohne Vorkettenemissionen) sind effizient einzusetzen, d.h. der N-Gehalt muss berücksichtigt werden,
(3) Dieselkraftstoffeinsatz im Anbauverfahren sollte möglichst verringert werden.
In M.-V. werden wesentliche politische Entscheidungen regelmäßig von Hinweisen auf Bevölkerungsprognosen begleitet. Dabei sind es Bevölkerungsvorausberechnungen, deren Ergebnisse maßgeblich von den getroffenen Annahmen, den zugrundeliegenden Bevölkerungsdaten und der Methodik abhängen. In Kombination mit deren weiteren Prinzipien handelt es sich eher um Modelle, deren Aussagekraft bezüglich eines langen Prognosezeitraumes stark limitiert ist. Da alternative Instrumente demgegenüber deutlich zurückstehen, können Infrastrukturentscheidungen nicht in ausreichendem Maße abgesichert werden.
Vor dem Hintergrund, dass M.-V. bspw. durch eine geringe Bevölkerungsdichte oder eine Vielzahl kleiner Gemeinden gekennzeichnet ist, sollte es die oberste Prämisse sein, langfristig weithin akzeptierte Strukturen zu schaffen, die den Gemeinden eine Perspektive gibt. In diesem Sinne ist der bisherige Ansatz der Stärkung der Zentren und der infrastrukturellen Marginalisierung der übrigen Gemeinden nicht erstrebenswert. Diesem Ansatz wird eine Flexibilisierung von Infrastruktur entgegengestellt, mit der alles erfasst wird, was im politisch gesetzten Auftrag bestehende Funktionsdefizite ausgleicht oder abdeckt. Gleichzeitig wird dem Begriff der Daseinsvorsorge eine Absage erteilt, da von Grunddaseinsfunktionen bei einem staatlichen Rückzug aus der Fläche nicht mehr gesprochen werden kann. Andernfalls würden bspw. die über 65-Jährigen nicht in die Zentren „flüchten‟. Zudem muss festgehalten werden, dass mit der Flexibilisierung des Begriffes Infrastruktur auch eine Neuinterpretation der Begriffe Mobilität und Verkehr einhergeht. Mobilität zeichnet bisher durch eine technische Überbetonung aus und zielt auch auf Ortsveränderungen ab. Damit überschneidet sich Mobilität definitorisch mit Verkehr. Zugleich ist die Rolle der Infrastruktur von nachrangiger Bedeutung. Die Integration des flexiblen Infrastrukturbegriffes führt zu einer Mobilität, die einfach die Fähigkeit zur Interaktion beschreibt und Verkehr wird zu konkreten Handlungen von Subjekten oder sozialen Gruppen. Beide sind dann nur noch von den individuellen Präferenzen und der Infrastruktur abhängig, wobei die Unplanbarkeit der individuellen Präferenzen festgehalten werden muss. Die infrastrukturelle Abhängigkeit zeigt sich auch bei Vulnerabilität und Resilienz. Während Vulnerabilität für Prozesse und deren Wirkungen auf Systeme sowie Organisationen in Abhängigkeit von Infrastruktur steht, bezeichnet Resilienz den Umgang mit vulnerablen Prozessen in Abhängigkeit von der Infrastruktur und der Zielsetzung. Aufgrund der nur unzureichend vorhandenen Informationen über die Gemeinden in M.-V. stand die Verbesserung der empirischen Basis gegenüber de-taillierten Maßnahmen im Fokus.
Ganz allgemein vollzog sich auf der Gemeindeebene zwischen 1990 und 2012 eine sehr vielschichtige Entwicklung. Das betrifft neben der Einwohnerzahl auch die altersgruppenspezifische Betrachtung, die der Beschäftigung sowie die Gemeindefinanzen. In Bezug zu den Einwohnerzahlen führte der Zensus zu eine deutlichen Bereinigung der Statistik. Jedoch wurde eine Rückrechnung für frühere Jahre per Gerichtsentscheid für unzulässig erklärt. Daher behalten die Werte vor 2011 ihre Gültigkeit. Während in den Jahren vor 2000 eine deutliche Suburbanisierung erkennbar war und sich in den Stadt-Umland-Bereichen entsprechende arbeitsräumliche Verflechtungen etablierten, hat sich die Suburbanisierung in der Folgezeit stark abgeschwächt und teilweise ins Gegenteil verkehrt. Getragen wird diese Entwicklung insbesondere durch die 20 - 25 sowie die über 65-Jährigen. Während bei den 20 - 25 Jährigen die ökonomischen Motive überwiegen, welche eine selektive Reurbanisierung stützt, hat die Wanderung der über 65-Jährigen eher infrastrukturelle Gründe. Die infrastrukturelle Marginalisierung der kleinen Gemeinden trifft auf eine Altersgruppe, die in zunehmenden Maße zu keiner Kompensation mehr fähig ist und so in Richtung der zentralen Orte abwandert. Alternativ zieht es diese Altersgruppe auch in touristisch bedeutsame Gemeinden. Damit tritt eine planerisch opportune Wanderungsbewegung ein, welche die Prämisse der Stärkung der Zen-tren unterstützt. Diese Segregation vollzieht sich vor einer dispersen Siedlungsstruktur, welche durch die politische Rahmensetzung und gezielte Vermarktungsstrategien in der Vergangenheit verfestigt wurde, die den individuellen Präferenzen viel Freiraum ermöglichte. Die Infrastrukturkonzentration destabilisiert die Strukturen und fördert wiederum die Arbeitsplatzkonzentration in den Zentren. Allein die Ober- und Mittelzentren vereinten 2012 60 % der SV Beschäftigungsverhältnisse. Die Arbeitsplätze sind damit weit stärker konzentriert als die Bevölkerung und hohe Auspendlerquoten die Folge. Dabei obliegt der Ausgleich infrastruktureller Defizite den Gemeinden, die wiederum eine hohe fremdbestimmte Ausgabenlast zu bewältigen haben. Demgegenüber steht ein KFA, der sich nicht an den realen Aufwendungen orientiert, so dass infolgedessen die Investitionen reduziert wurden. Des Weiteren sind finanzielle Spielräume kaum vorhanden. Im Ergebnis markiert bspw. die selektive Bevölkerungsentwicklung oder die Handlungsunfähigkeit der Gemeinden, die aus der Entwicklung der Gemeindefinanzen resultiert, jeweils einen vulnerablen Prozess, die bisher nicht adäquat bewältigt werden. Die Stärkung der Zentren kann nur im Hinblick auf die politische Zielsetzung als eine positive Resilienzstrategie für eine Handvoll Gemeinden bezeichnet werden.
Um eine zukünftige Alternativendiskussion anzuregen, wurden die Gemeinden im Anschluss einer multivariaten Analyse unterzogen. Zur Absicherung der Ergebnisse wurde eine Prüfung auf Normalverteilung sowie eine Untersuchung auf stochastische Unabhängigkeit vorgeschaltet. Die Prüfung auf Normalverteilung hat ergeben, dass diese für keine der 165 Variablen vorlag. Die maßgebliche Ursache hierfür liegt in der Betrachtungsebene der administrativen Einheiten und dem hohen Anteil der Gemeinden bis 2.000 Einwohner. Allerdings sind die Gemeinde gerade Untersuchungsgegenstand dieser Arbeit, so dass sich eine Änderung der Betrachtungsebene ausschloss. Folglich führte die Gliederung der administrativen Einheiten in M.-V. in Abhängigkeit von den Einwohnerzahlen zu Autokorrelationen zwischen den einzelnen Variablen. Diese Zusammenhänge bestanden auch bei Variablen mit einem zeitlichen Trend, so dass als Folge der Prüfung auf stochastische Unabhängigkeit die Clusteranalyse in zwei Analysen mit jeweils einem Variablenblock geteilt wurde. Die Anzahl der betrachteten Variablen reduzierte sich hierbei auf insgesamt 88. Das Resultat der ersten Clusteranalyse waren 5 Klassen, wobei Rostock eine eigene Klasse bildete. Die anderen Städte wie Greifswald, Stralsund, Neubrandenburg, Wismar sowie Schwerin formten ihrerseits einen Cluster und die übrigen Gemeinden verteilten sich auf die anderen drei Klassen. Insbesondere zahlreiche Tourismusgemeinden und zentrale Orte traten in einem eigenen Cluster deutlich hervor. Die Dominanz der großen Gebietskörperschaften zeigte sich auch in der zweiten Clusteranalyse, wobei sich die Struktur mit 6 Klassen als sehr stabil erwies. Die Ergebnisse wurden nach-folgend in einer Typisierung zusammengefasst, wobei sich 14 Regionaltypen erga-ben, deren Interpretation 7 Haupttypen offenbarte. Neben Rostock als Regiopole treten u. a. Regionalzentren, Kleinstgemeinden oder Gemeinden mit eingeschränkter Leistungsfähigkeit auf. Durchaus bemerkenswert ist der Umstand, dass einige Gemeinden von Usedom und Rügen eher Stadt-Umland-Gemeinden entsprechen und solche mit einer eingeschränkten Leistungsfähigkeit eher im Osten des Landes anzutreffen sind. Daneben sind Tourismusgemeinden ähnlich strukturiert wie Mittelzentren und zahlreiche Grundzentren grenzen sich lediglich über ihren Status von anderen Landgemeinden ab. Darüber hinaus grenzt sich diese Gliederung deutlich von der des Landes mit den ländlichen Gestaltungsräumen ab. Zur Identifizierung dieser wurden Kriterien herangezogen, die stochastisch nicht unabhängig sind, welche zur Basis für ein politisch motiviertes Ranking wurden. Die damit aufgeworfene These von der fragwürdigen Zukunftsfähigkeit, ist in erster Linie politisch determiniert.
Insgesamt zeigt sich mit der Handlungsmaxime „Stärkung der Zentren‟ ein vulnerabler Prozess, der sich in der Gemeindeentwicklung deutlich niederschlägt. Zur Vermeidung einer weiteren Vertiefung ist zunächst eine theoretische Neuausrichtung, wie sie in Grundzügen vorgestellt wurde, notwendig. Dabei ist die Forderung, dass Infrastruktur flexibilisiert werden muss, nicht neu. Sie wurde bspw. schon in Zusammenhang neuer interkommunaler Kooperationsformen postuliert. Die bisherige normative Fixierung der langfristigen Infrastrukturentwicklung über ROG und LPlG manifestiert die Reduzierung des ländlichen Raumes auf seinen existentiellen Kern und ignoriert gewachsenen Strukturen und individuelle Präferenzen der lokalen Bevölkerung. Im nächsten Schritt sollten die Bevölkerungsprognosen um andere Instrumente ergänzt werden, um frühzeitig bestimmte Entwicklungen aufzudecken und zu gestalten. Hierbei sollten die Akteure vor Ort, insbesondere die Gemeinden, auch in der Lage sein, die Gestaltungskompetenz wahrzunehmen. Das setzt voraus, dass zur Erfüllung der Pflichtaufgaben keine Liquiditätskredite erforderlich sind. Sollte eine aufgabengerechte Finanzausstattung nicht möglich sein, muss die derzeitige Aufgabenverteilung zwischen den Kommunen, dem Land sowie dem Bund neu geregelt werden. Eine fremdbestimmte Aufgabenträgerschaft und starre Richtwerte hinsichtlich der infrastrukturellen Ausgestaltung sind Mittel der Vergangenheit, die eine Flexibilisierung und mehr gemeindliche Selbstverantwortung nicht zulassen. Danach kann man beginnen über eine Gemeindegebietsreform Organisationsschwächen zu beseitigen und eine Resilienzstrategie zu verfolgen, die sich nicht allein in einer weiteren Infrastrukturkonzentration erschöpft.
Coastal and marginal seas – like the Baltic Sea – serve as natural reaction sites for the turnover and accumulation of land-derived inputs. The main location for the modification and deposition of the introduced material is, in most cases, not the water mass, but the sediment. Its key function as central reactor in the interaction between land and sea has so far been insufficiently studied and assessed. This study was part of the interdisciplinary SECOS project that aimed to identify and evaluate the service functions of sediments in German coastal seas in the context of human use with a focus on the Baltic Sea. One of its goals was to assess sediment functions related to the intermediate storage or final sink of imported material like nutrients and contaminants, and quantify their inventory as well as their mass accumulation rates on multi-decadal to multi-centennial time scales. For that, a detailed examination of the natural and anthropogenic processes that interfere with sediment accumulation in the south-western Baltic Sea basins is essential.
Certain basal Teleostei from the Early Jurassic of Mecklenburg-Western Pomerania (Germany) and the Late Jurassic of the Franconian Alb (Bavaria, Germany), the Swabian Alb (Baden-Württemberg, Germany) and the western Jura-Mountains (Ain, France) are described. The present doctoral dissertation includes four studies, dealing with representatives of “Pholidophoriformes”, Leptolepidae and Orthogonikleithridae. These studies include anatomical descriptions of new taxa and reviews of poorly known fishes. Furthermore, the stratigraphic and palaeobiogeographical distributions of the examined taxa are discussed.
Quang Xuong is considered as one of the most developed districts in Thanh Hoa Province in terms of agricultural. The major purpose of this research is to find good places to suggest for annual crops production in the case study. Therefore, the assessment of land potential productivity, land suitability, and land cover/land use change in different periods is essential for making strategies of sustainable agricultural development as this will help land-users and land managers to discover the potential and limitations of the current existing land conditions to make appropriate policies and plans for future land use. Its results will provide basic information to make reasonable decisions for investments and rational reclamations of cultivated land before and after each crop season in order to meet the objectives of sustainable development in terms of economic efficiency, social acceptability, and environmental protection. The research site is located at latitudes 19 degree 34 minute N - 19 degree 47 minuteN and at longitudes 105 degree 46 minute E - 105 degree 53 minute E. The total area is about 227km2; in which 128km2 is in use for agricultural activities. Based on soil classification methods by FAO-UNESCO (1988), the agricultural land is classified into six main soil groups, including Arenosols, Salic Fluvisols, Fluvisols, Gleysols, Acrisols, and Leptosols, 12 soil units and 18 sub-units. The largest area belongs to the Fluvisols group with 9358.29ha and the smallest area is identified as the Leptosol group with 219.33ha. Most of the soil in this district has low to moderate nutrition, but in general, they are still suitable for agricultural production. There are 42 land units defined in the land mapping, which can be different from each other by one or more land characteristics. The land mapping unit is created from the overlay of all thematic maps of soil chemicals, soil physical characteristics, and relative topography together by application of GIS techniques. It presents land characteristics and properties in this case study and will be used in comparasion with a particular crop requirement for growth in land suitability evaluation process. A certain land unit may be suitable for one or more types of different land use. It is also classified as highly suitable for a specific land utilization type, but less suitable or unsuitable for other crops. For example, in this study, land unit 26 is determined as highly suitable (S1) for growing paddy rice and maize, but it falls into moderately suitability (S2) for groundnut crop by using parametric (square root) method used in this thesis. Depending on the kind of crops need to be evaluated and its requirement for development compared with each land unit characteristics, land-users will determine the best suitable place for crop production. Identification of land use change in different periods of time has become a central key to monitoring of land resources. It is relatively important for effective land management to protect the land resources, especially the land used for agricultural production from overuse and environmental changes. The sprawl of inhabitant areas, development of rural infrastructures, and industrialization are responsible for serious losses of agricultural land. In this study, remote sensing techniques were applied to studying the trends of land cover change in the abovementioned district in a period of about 24 years from 1989 to 2013. ArcGIS software was adopted to develop the land cover and the change of land use maps from 1989 to 2013. Two satellite images with moderate resolution were collected from USGS Earth Explorer website, Landsat5 TM for 1989 and Landsat8 OLI & TIRS for 2013. After image geo-processing, the images were classified into six land cover categories by applying supervised classification method (Maximum Likelihood). The six main obtained land cover types were built-up areas, agricultural land, forest land, water surface area, salty land, and unused land. The overall accuracies of land cover maps for 1989 and 2013 were 94.08% and 92.91%, respectively. The results of change detection analysis indicate that the cultivated, water surface and unused lands decreased by 22%, 17%, and 91%, respectively. In other side, the built-up and salty land increased by 78%, 58%, respectively and forest land increased from 52.69ha in 1989 to 395.76ha in 2013. The assessment of land potential productivity for agricultural production and land suitability for selected annual crops was based on FAO guidelines for land evaluation (FAO, 1976, 1985, and 1993) which were adopted and slightly modified for compatibility with Vietnamese conditions. All related data were stored, analyzed, mapped and presented in ArcGIS software. Weighted Linear Combination Method developed by Hopkins (1977) and GIS techniques were used to analyze and determine the land potential for agricultural use in the study area. The results show that 5.26%, 83.10%, 10.06%, and 1.57% of the investigated areas were assessed as high potential, moderate potential, low potential and very low potential for growing crops. Regarding land suitability evaluation, the simple limitation, parametric (square root), and AHP methods were used to evaluate the suitability levels for selected crops, including paddy rice, sweet potato, groundnut, maize, potato, sesame, soybean, and green pepper. The obtained results indicate that each applied method provides different results of land suitability level for a specific crop in certain land units compared to the other two methods, and OM, soil pH, soil texture, and relative topography were found out as the main limitation factors which affected land suitability level. The study also suggests that three different methods as abovementioned can be expanded and applied in other places with the appropriate factors used for land suitability evaluation according to particular area conditions.
A large portion of the earth's surface is covered with various vegetation classes (i.e. grassland, wetland and agricultural area, forest) of many diverse species and canopy configurations. The ability to assess and to monitor canopy parameters, such as biomass, leaf area index, and vegetation water content, is of vital importance to the study of different agronomic processes. Remote sensing techniques provide a unique capability towards probing different vegetation types and canopy by operating at different bands, observation angle etc. Over the past decades, significant progress has been made in remote sensing techniques of land processes specially vegetation characteristics through development of advanced ground-based, airborne and space-borne microwave sensors, methods and approaches such as theoretical, semi-empirical and empirical models, needed for analyzing the data. These activities have sharply increased in recent years since the launch of different active and passive satellites and sensors. Remote Sensing (RS) science and techniques combined with ground truth data can provide new tools for advanced agricultural crop applications. It has been demonstrated that RS has the ability to estimate biophysical parameters of agricultural crops over time at local, regional, and global scales. In this study, RS images in visible/near infrared (VIS/NIR) domain as well as microwave domain combined with ground truth data were used to assess biophysical parameters of agricultural crop during their whole growing season at Durable Environmental Multidisciplinary Monitoring Information Network (DEMMIN) test site in North East Germany. Ground truth studies were carried out for 31 weeks during 17th April – 13th November 2013 over three crop lands including winter wheat, barley and canola. Landsat 8 OLI, Landsat 7 ETM+ were used for the VIS/NIR studies and TerraSAR-X synthetic aperture radar (SAR) images were used to study biophysical parameters of agricultural crops in microwave part of electromagnetic spectrum. The analysis was conducted by calculating different vegetation indices (VIs) to estimate the biomass (fresh and dry), LAI, and vegetation water content (VWC) of three crops using Landsat 8 OLI and Landsat 7 ETM+ combined with ground truth data. A new concept of Soil Line retrieval from Landsat 8 image was also developed to estimate plant biophysical parameters using soil line related vegetation indices in optical domain of electromagnetic spectrum. Different approaches including univariate, multivariate stepwise regression and semi-empirical water cloud model was also used to estimate the biophysical parameters of agricultural crop using TerraSAR-X data in microwave domain of electromagnetic spectrum. Perhaps the most important conclusion of this study is that the RS approach can provide useful information about estimating agricultural crop parameters over time and local scale, which can therefore provide valuable information to aid the agronomy community.
Tourism is a multifaceted economy and based on existing nature, as well as on culture in a geographical space to become a successful destination for tourism. The topic of this survey is how tourism in the transitioning country of Vietnam influences culture and nature or vice versa. A special focus will be on the transitioning aspect. This study gives insights about how in the transitioning country of Vietnam, tourism can act as an additional driver of change in terms of nature and culture or if tourism is only adapting to these changes. Therefore in the beginning the subject of ‘social-ecological transformation’ is described and furthermore the situation in Vietnam will be introduced. The key aspects here will be within the range of geography and sociology. It becomes evident, that scientific views on this topic are rather diverse, but nevertheless many theoretical aspects can be observed also in the investigation area Vietnam. Within the country several aspects of economic transition already became reality, while others, like social, ecological or political reforms, are still at the beginning. The empirical part of this study deals with existing thoughts, according to the topic of transition, in relation to tourism development and respectively to environmental understanding, by analyzing and comparing positions of 21 international and Vietnamese experts, 569 international tourists and 710 Vietnamese students. By doing so, similarities within opinions about tourism development and the environmental situation in the country became observable. While tourism is rated as a mostly positive development, the current environmental situation has mostly been criticized by all survey participants. Apart from that, connections between both aspects (tourism economy and nature) are often of no importance or the relationship is identified to be just a rudimentary one. In case of these opinions, involvement within one social group and personal experience is of larger importance than cultural conditioning (European or Asian), e.g. own travels, own jobs and own education. This fact becomes visible by very similar ratings of environmental problems on the one hand and the beauty of natural landscapes on the other hand, done by both survey groups; namely international tourists and Vietnamese students.
This thesis aims to develop a palaeogeographic and chronostratigraphic model of the southwestern Baltic Sea area, to improve our understanding of the depositional history of the Late Pleistocene on both a local and a transregional scale. New sedimentological, palaeontological and numerical age data will be presented from three reference sites located at the coast of NE Germany. So far, the chronostratigraphic assignment of Saalian and Weichselian sediments of NE Germany has been based mainly on lithostratigraphic methods and on sparse numerical age data, resulting in a fragmentary age database. Modern sedimentological approaches, such as facies analyses, have been applied only at a few isolated profiles. Thus, a reliable reconstruction of the depositional environments and their stratigraphic positions is still missing for the study area, which makes the correlation between Pleistocene successions from NE Germany and other circum-Baltic regions problematic. To address these lithostratigraphic and geochronologic issues, three crucial profiles were re-investigated using a multiproxy approach, including sedimentological, geochronological, and palaeontological techniques. The Glowe and Kluckow sites are located on the peninsula of Jasmund (Rügen Island), whereas the Klein Klütz Höved (KKH) section is situated between Wismar and Travemünde at the coast of the Mecklenburg Bay. The age-constraining of critical horizons was conducted by luminescence dating of feldspar and quartz grain minerals. Together, these successions represent the Late Saalian to Late Weichselian period and give rise to the following picture. The Glowe and Kluckow sections reveal that ice-free conditions dominated the study site between 47 and 42 ka. Deposition occurred in a steppe-like environment with moderate summers and cool winters. Meandering and braided river systems inhabited by various freshwater species, such as Anodonta cygnea, Pisidium amnicum and Perca fluviatilis, shaped the landscape. A subsequent cooling phase resulted in the establishment of a periglacial landscape and the formation of ice-wedges. This phase is shown in this thesis to be connected to the Klintholm advance documented at 34±4 ka in Denmark. Furthermore, the data indicate the formation of a lacustrine basin during the transition of MIS 3 to MIS 2 under sub-arctic climate conditions. A potential link to the Kattegat ice advance (29 – 26 ka) will be proposed. At 23±2 ka, the study area was characterised by proglacial and ice-contact lakes related to the Last Glacial Maximum ice advance of the Scandinavian Ice Sheet (SIS). This is the first documented SIS advance of Weichselian age, which reached Jasmund at 22±2 ka. The KKH sedimentary succession comprises deposits of Late Saalian to Late Weichselian age: after a period of deglaciation between ~139-134 ka (Termination II; MIS 6), which is preserved in a glaciofluvial sequence deposited in a braided river system, a lacustrine environment was established in an arctic to subarctic climate. During this time, the landscape was vegetated by typical Late Saalian flora communities. The Eemian interglacial is represented by lacustrine to brackish deposits covering the reference pollen zones 1 to 3. During this initial part of the Eemian, thermophile forest elements spread (Quercus, Ulmus), indicating a deciduous forest. The presence of brackish ostracods represents the influence of a marine transgression between 300 and 750 years after the beginning of the Eemian period. A hiatus of more than 90,000 years separates the Eemian from the overlying Late Weichselian sediments. During the Late Weichselian period, the deposition at KKH was dominated by glaciolacustrine and subglacial facies, where the first Weichselian ice advance occurred at 20±2 ka. The sedimentological and geochronological findings in this thesis provide valuable information for the reconstruction of the palaeoenvironmental history from the Late Saalian to Late Weichselian period. The Late Saalian palaeoenvironmental setting is reconstructed, including Termination II and the initial phase of the Eemian interglacial. Furthermore, the Eemian marine transgression is shown to have occurred 300 to 750 years after the beginning of this interglacial. The first proven Weichselian advance of the SIS approached NE Germany between ~23 and ~20 ka. In contrast, there is no evidence to support a pre-LGM advance of Weichselian age to the study area, as proposed by several authors, neither at Glowe and Kluckow, nor at the KKH site. Based on the presented results, and contra what was previously assumed, the MIS 3 Ristinge and Klintholm advance of the SIS, documented in Denmark, did not reach NE Germany.
The present doctoral dissertation comprises new studies on the fossil vertebrate assemblage recovered from the late Early Jurassic marine “Green Series” clay deposits of Grimmen and Dobbertin in north-eastern Germany that contribute to fill the gap of knowledge regarding its faunal composition and its relevance for understanding Early Jurassic vertebrate life. The investigations led to the recognition of wide range of vertebrate taxa, including basal gravisaurian sauropods, secondarily marine reptiles, a diverse fauna of leptolepid fishes, and a new genus and species of pycnodontiform fishes. In addition, a taxonomic revision of the Early Jurassic saurichthyid fish Saurorhynchus was performed, leading to the identification of two new, previously unnamed species. The results provide new insights into the taxonomic, systematic, and ecological diversity of Early Jurassic vertebrates, and hence add significant new data to our knowledge on Lower Jurassic vertebrate palaeobiodiversity patterns.
The focus of this study is on the geochronological and paleo-climatic characterization of late Pleistocene glaciations in Turgen and the Khangai Mountains located in central and western Mongolia. These two mountain ranges form a 700 km long NW-SE transect through Mongolia and allow assumptions of the temporal and causal dynamics of the regional late Quaternary glaciations and their correlation to other mountain glacier records from Central and High Asia. In order to evaluate extent and timing of the Pleistocene glaciations in Mongolia, geomorphological mapping and cosmogenic radionuclide (CRN) surface exposure dating (10Be) were carried out in four valley systems located in the Khangai and Turgen Mountains. Additionally, a coupled 2-D surface energy balance and ice flow model was used to determine steady-state conditions for glaciers under various climatic scenarios. With this model it is possible to test combinations of temperature and precipitation settings, which would produce glacier configurations that fit the field-mapped ice extent. In total, 47 glacial boulders and roche moutonnées were sampled, prepared and AMS measured to determine the absolute timing of moraine formation and ice retreat based on 10Be surface exposure dating. Of these, 27 samples were obtained from the Khangai Mountains (three separate moraine sequences) and 20 samples were taken from the Turgen Mountains (two moraine sequences). The dating results (presented as minimum ages) give evidence for a late Pleistocene maximum ice expansion during late MIS 5 (81−78 ka) and major ice advances during MIS 2 (26−20 ka) in both mountain ranges. Only in the Khangai Mountains (central Mongolia) very significant glacier advances also occurred during mid-MIS 3 (49−35 ka), which exceeded the ice limits set during the MIS 2 glaciation. A final ice position, constructed shortly before the onset of full ice retreat was formed between 19-16 ka, and is likely to represent a recessional ice stillstand, or alternatively a final ice readvance during the early part of the last-glacial-interglacial-transition (LGIT) in both mountain ranges. Energy/mass balance and ice flow modeling results suggest that climatic conditions during the MIS 5 and MIS 3 maximum advances in the Khangai Mountains were depressed between a ∆T of -6.0 to -5.2 °C with a precipitation factor of 1.25-1.75 (P = 125-175 %, compared to modern conditions), and a ∆T of -5.3 to -4.4 °C (P = 75-125 %), respectively. For the MIS 2 ice advances modeling results from the Turgen and Khangai Mountains suggest a temperature depression ∆T of -5.7 to -4.6 °C (at 22 ka; P = 25-50 %) in the East-Turgen, and a ∆T of -7.5 to -6.6 °C (at 20 ka; P = 25-50 %) in the Chulut area (Khangai Mountains). These results document a 1.8 - 2 °C difference of the modeled temperatures required to expand the studied paleo-glaciers in the Turgen and Khangai mountains to their field-mapped MIS 2 ice limits, highlighting a spatially differentiated pattern of paleo-temperature lowering across the studied 700 km NW-SE transect. Taken together, the presented record indicates that the largest ice advance in both investigated mountain ranges occurred during the MIS 5 / MIS 4 transition, despite earlier suggestions by previous studies that the local glacial maximum would be associated with the coldest periods of the last glacial cycle (i.e. MIS 4 or MIS 2). Glacier systems in the Khangai Mountains also increased substantially during MIS 3 (local LGM) in response to cool but comparable wet conditions, probably with a greater-than-today input from winter precipitation and an additional input of recycled moisture from expanded paleo-lakes in the Valley of the Great Lakes. The lack of a severe cooling during the MIS 3 ice advances, and probably also during the late MIS 5 ice expansion, suggests that variations in atmospheric circulation patterns, with its significance for controlling the regional precipitation/moisture supply, was a key driver for these late Pleistocene ice advances in Mongolia. This notwithstanding, there is also clear evidence for the development of an extensive glaciation during MIS 2, coinciding with a period of severe cooling and hyperarid conditions. This highlights that glacier systems in Mongolia responded sensitively, both, to variations in moisture supply and its seasonal distribution, and to the marked insolation minima during the last glacial cycle.