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Institute
- Frühere Fachbereiche (49)
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- Nachhaltigkeitsmgmt./-ökologie (28)
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The role of tree diversity for individual tree growth, crown architecture and branch demography
(2012)
In the light of the concurrent loss of biodiversity, biodiversity and ecosystem functioning (BEF) research attracted a great deal of attention and emerged as one of the important fields of research in ecology. Since important ecological interactions such as competition occur between individuals, the understanding of individual tree growth was considered to be fundamental for forest related BEF research. Individual tree growth is determined by the above- and belowground interactions of a tree individual with its local neighbourhood. To obtain a deeper understanding of BEF relationships, I broadened the focus from individual tree growth (usually measured as diameter or biomass increment) to the arrangement and dynamics of the above-ground modules of trees in dependence of their local neighbourhood. More precisely, the main objective of the present thesis was to analyse the impact of tree diversity on individual tree growth, crown architectural and branch demographic variables. Thereby I considered crown architectural variables as important indicators of the competition for light. In addition, crown architectural variables impacted ecosystem services such as erosion control. Furthermore, the results of the present thesis contributed to the current discussion on species coexistence theories, which may be differentiated by two opposing views: one that relies on neutral processes and one that implicates a role for meaningful differences in the ecological strategy (niche) of co-occurring species. The studied forest ecosystems were the subtropical broad-leaved evergreen forests of southeast China, which have been under high human pressure due to a long history of intensive land-use. The area is of particular interest for BEF research due to the high species richness of woody plants, including many, yet poorly studied species, and due to the rough terrain with steep slopes, which cause severe soil erosion. The present thesis combines three observational with two experimental studies, applying the local neighbourhood approach along an age gradient from tree saplings to mature trees. In the Gutianshan National Nature Reserve (GNNR), I conducted two observational studies on permanent plots which were chosen according to a space-for-time substitution design. The aim of the first study was to reveal the effects of diversity (species richness, functional diversity) together with other biotic and abiotic variables on morphological growth parameters (crown area, crown displacement and stem inclination) of target trees of four tree species (Castanea henryi, Castanopsis eyrei, Quercus serrata and Schima superba). In the second study, the same target trees together with their neighbours were used to analyse the relation between stand related functional diversity and the horizontal and vertical structure of the canopy. The third study was conducted in a young secondary broad-leaved evergreen forest. Using two target species (Castanopsis fargesii and Quercus fabri), the role of diversity, intra- vs. inter-specific competition and the mode of competition (symmetric vs. asymmetric) on the target individuals was tested by analysing five-year radial growth increments. The two other studies were carried out in an experimentally established plantation, using saplings of four tree species (C. henryi, Elaeocarpus decipiens, Q. serrata and S. superba), which were planted in monoculture, twoand four-species combinations and in three densities. The fourth study focused on mechanisms of coexistence and the role of species richness, species composition, species identity and density on sapling growth. The fifth study tested the effect of sapling density and identity on the througfall kinetic energy, which represents a measure for the erosive power of rain. It was found that functional diversity does affect crown architectural and canopy related parameters of forests in the GNNR. However, no effects of species richness on radial-growth were detected in the younger forest. Since I also did not find strong effects of species richness on saplings in the experimental plantation, diversity effects may evolve at a later age stage. The importance of the diversity effect may be related reversely to that of species identity in an age gradient of forest stands. The findings suggest that different mechanisms of coexistence operate simultaneously but that their relative importance may shift through the life stages of trees. During the sapling stage, species-specific differences in growth and architectural traits support niche theory. In older forest stands, no species-specific differences in growth parameters could be detected. However, I did find effects of functional diversity on horizontal canopy structure. I conclude that mechanisms of coexistence may not only change with forest stand age, but may also differ for distinct traits. The present thesis, being the first to apply the local neighbourhood approach with regard to crown architecture and branch demography within the BEF field of research, stresses the importance of this individual based approach. Although the observed forest systems are very complex, crown architectural and canopy structural variables were found to be affected by diversity. The finding that the degree of erosive power of rain could be elucidated by crown architectural variables, encourages further studies to reveal possible relations between biodiversity and other ecosystem functions or services, which might be mediated by crown architectural and canopy structural variables.
This thesis makes an important contribution to better understanding biodiversity and ecosystem function relationships across trophic levels in forests - aspects that are still underrepresented in BEF research. Ongoing biodiversity loss can be expected to change important trophic interaction pathways in these ecosystems, making increased efforts in exploring the mechanisms underlying, and the drivers determining, the impact of trophic complexity on the relationships between biodiversity and ecosystem functioning a crucial objective for holistic approaches to BEF research.
The dissertation analyzes the role of large banks in the context of financial (in)stability. Based on the underlying “too big to fail”-problem (TBTF), the three included papers investigate the reasons for the instability of banking systems on a national and international level. Already in advance, but at least since the years 2007/2008 with the escalation of the financial crisis, especially large banks are under critical supervision of regulators and the society. There exist numerous aspects that should to be taken into account when addressing TBTF which complicates the finding of a solution to the problem. In particular, the thesis investigates three major issues in this context: 1.) The contribution of the size of a bank to the development of financial crises or the exposure of large banks to systematic risk and contagious spillovers. 2) The spillover effects from one banking system to another and the importance of banks’ foreign asset holdings for the transmission of sovereign risk on foreign banks. 3.) The impact of the degree of competition in the German banking market on the stability of the banking system.
The dissertation project focuses on empirically investigating consumers´ attitudes, motiva-tions and purchasing decisions regarding sustainable products. The focus on this micro per-spective, however, does not reflect consumers´ roles within the transformation towards sus-tainable consumption. Therefore, the present framework paper puts the included papers into a greater context and evaluates the findings on a meta-level by applying an enhanced transition management theory. The analysis underlines that consumers´ limited personal capabilities are an underlying reason for unsustainable practices. Therefore, the active engagement not only of consumers, but also of companies is required if the transformation is to be successful. If companies actively support consumers in making sustainable choices, consumers can engage in sustainable consumption with only low cognitive efforts. On this basis, genuine sustainable choices are enabled. The dissertation provides practical implications by highlighting potential measures which will help to promote sustainable products from niches to mainstream. In sum, the dissertation project enhances academic understanding of consumers´ sustainable purchas-ing behavior and reveals the potential of integrating such insights into the management of transformations towards sustainable consumption.
Die schlechte Qualität von Binnengewässern ist ein weit verbreitetes und herausforderndes Problem für die Menschheit. Das Konzept der Komplexität ist ein besonders vielversprechendes Konzept zur Analyse und Lösung dieses Problems und von Problemen der öffentlichen Ordnung im Allgemeinen. Der Hauptgrund ist die Stärke des Konzepts, strukturelle Problemmerkmale innerhalb eines umfassenderen strukturellen Ansatzes für die politische Problemlösung zusammenzufassen. Bislang blieben diese möglichen Vorteile jedoch verborgen, da kein klares Verständnis der Komplexität vorhanden war, was letztendlich eine systematische Analyse der Auswirkungen der Komplexität auf Lösungen und Governance-Strategien behinderte. Diese Studie zielt darauf ab, den Wert des Komplexitätsbegriffs für systematische vergleichende Analysen von Wasserproblemen und von Problemen der öffentlichen Politik im Allgemeinen zu stärken. Um dieses Ziel zu erreichen, werden in dieser Arbeit das Konzept der Komplexität sowie die Implikationen der Komplexität für Lösungen und Governance-Strategien sowohl aus theoretischer als auch aus empirischer Sicht spezifiziert. Zu diesem Zweck werden fünf grundsätzliche Ansätze angewandt, die sich auf die zugrunde liegenden Prämissen, die Rolle eines interdisziplinären Ansatzes, die Europäische Wasserrahmenrichtlinie als empirischen Bezugspunkt, die Integration von praktischem Wissen und den Fokus auf externe Validität beziehen. Hauptergebnisse sind: Operationalisierung und Messung: Diese Dissertation bietet eine detaillierte Operationalisierung der Komplexität in Bezug auf die Dimensionen der Ziele, Variablen, Dynamiken, Vernetzungen und Informationsunsicherheiten. Sie zeigt zudem, dass sich Wasserqualitätsprobleme in Deutschland entlang dieser fünf Komplexitätsdimensionen unterscheiden. Dies gilt für 37 Typen von Wasserqualitätsproblemen und vier Problemcluster, die sich hier auf ´zahme´, ´bösartige´, ´sysytemkomplexe´ und ´mit Unsicherheit behaftete´ Probleme beziehen. Implikationen von Komplexität für Lösungen: Diese Dissertation legt nahe, dass die Beziehungen zwischen Komplexität und Politikumsetzung sowohl positiv als auch negativ sein können und je nach Dimension der Komplexität und Politikumsetzung variieren können. In Bezug auf die untersuchten Wasserqualitätsprobleme zeigt diese Arbeit zudem verschiedene Auswirkungen der Komplexität auf die Politikumsetzung auf, sowohl bei den 37 Problemtypen als auch bei den vier Problemclustern. Implikationen von Komplexität für die Governance: Diese Dissertation schlägt einen differenzierten theoretischen Ansatz vor, um Governance-Strategien für komplexe Problemlösungen zu definieren. Dabei wird gezeigt, dass die Rolle verschiedener Institutionen, Akteure und Interaktionen für Lösungen entlang der fünf Schlüsseldimensionen der Komplexität (Ziele Variablen, Dynamiken, Vernetzungen und Informationsunsicherheiten) sowie entlang verschiedener Managementstrategien (Informationsgenerierung, Modellierung, Verwendung von Entscheidungsunterstützungs-instrumenten, Priorisierung von Maßnahmen, Konfliktlösung, Entscheidung unter Unsicherheit und Anpassungsfähigkeit und Flexibilität) variieren. Zukünftiger Forschung wird empfohlen, auf diesen Ergebnissen aufzubauen, indem weitere empirische Nachweise geliefert werden und der Governance-Ansatz für komplexe Problemlösungen weiter kontextualisiert wird. Auf diesem Weg kann dazu beigetragen werden, die ´Logik des Scheiterns´ (Dörner 1996) in Bezug auf komplexe Problemlösungen in eine ´Erfolgslogik´ umzuwandeln, um Probleme unterschiedlicher Komplexität im Wasserressourcenmanagement und bei Problemen öffentlicher Ordnung anzugehen.
Uganda has been plagued by political instability in the past and wide spread abuse of human rights coupled with failed economic policies. However, the country has witnessed increased economic growth and the government has embarked on several poverty eradication programmes despite rising income inequalities and poverty in the country.
The task of ensuring poverty as a human right in the country has not been an easy one for those charged with the duty of ensuring the right to freedom from poverty. This research examines the complexity of attaining the right to freedom from poverty in a country like Uganda. This study will also give a philosophical view on poverty and human rights and those responsible for ensuring the implementation of this right.
Through the analysis, the research examined the key challenges faced in attaining the right to freedom from poverty in Uganda, discussed how poverty was defined through different perspectives. The information provided in the analysis is further examined by putting the theoretical findings in correspondence with the gathered empirical information for more definitive results of the study.
The fundamental results and conclusion of this research revealed the overall challenges faced in regarding poverty as a human right which include how poverty is defined, the mindset, the political history of Uganda and so on. However, the study has recommended extensive research into the role of the family in ensuring poverty as a human right and further research in the effectiveness of the laws in Uganda in ensuring poverty as a human right.
Considering the recent success of right-wing populist candidates and parties in the United States and across Europe, there has for some years now been talk among scholars (and the wider public) about a worldwide democratic recession. Levitsky and Ziblatt paint a very gloomy picture when they write that democracy is at risk of dying. Others are not as pessimistic, but they still argue that democracy is in a state of serious disrepair. The younger generations appear to be especially unsupportive of democracy’s liberal principles and more willing to express support for authoritarian alternatives. What these authors overlook, however, is that the publics of advanced industrial societies have experienced an intergenerational value shift. In fact, populations in industrial democracies have become more liberal overall, but not everyone’s mindset is changing at the same speed. It is mainly – but not exclusively – the members of the lower classes that do not keep up. While societies have generally become more liberal, there is increasing alienation between the social classes over these liberal values. Drawing on a more recent trend in social class research with a social cognitive approach, this dissertation contributes to the study of growing anti-democratic tendencies around the world by analyzing the interplay between inequality dynamics and value orientations. The focus lies on investigating the effect socio-cultural polarization (i.e., ideological polarization between social classes) has on civic culture in the mature democracies of the West. The findings suggest that it is not ideological polarization between the social classes that has the greatest negative effect on civic culture, or general civic attitudes and behavior, for that matter. It is the increasing dissent in society about whether the country’s elites are still to be trusted with making the right decisions to increase the average citizen’s quality of life. This difference in opinion manifests itself in a decline in some civic attitudes.
Summary
Since the early 2000s, ecosystem services strongly gained significance as a research topic. While the number of papers strongly increased, the concept was further developed which changed the way it was applied. From highlighting the value of ecosystems by viewing them not only from an ecological, but also from an economic perspective in the beginning, it is nowadays, among others, used to map and calculate the monetary value of ecosystem services. Lately, the International Panel on Biodiversity and Ecosystem Services (IPBES) further developed the concept into Nature’s contributions to people (NCP) which puts a stronger emphasis on stakeholders and indigenous knowledge.
However, so far none of the conceptual developments managed to integrate the temporal dimension of ecosystem services into this concept, although this should be the basis for a sustainable long-term management of ecosystems and their services.
Therefore, I present three articles in this thesis that deal with temporal aspects of ecosystem services. In two of them I also present a proposal for a framework for the classification of ecosystem services based on their temporal dynamics.
In this dissertation I differentiate between two types of temporal aspects, both of which have in common that change takes place over a certain period of time. The concepts of transformation, transition and regime shift are used to describe changes in social or ecological systems as a whole, for example the transformation towards a more sustainable society. The temporal dynamics that I present, on the other hand, relate to the temporal changes in ecosystem services themselves.
The first article focuses on how the literature on ecosystem services incorporates social and ecological change, illustrated by the concepts of transformation, transition, and regime shift. The second and third articles deal with the temporal dynamics of ecosystem services. While the second article presents a preliminary framework for categorizing the temporal dynamics of ecosystem services, the third article uses this framework to test how the temporal dynamics of ecosystem services are represented in the literature.
Based on the insights from the three articles, I conclude that most of the studies on ecosystem services only focus on one point in time. One reason for this is that most studies are conducted over a maximum of a four-year time span which does not allow to monitor dynamics over longer time spans. In most articles that do account for temporal aspects, the focus is strongly on the side of ecological supply of ecosystem services rather than on the demand-side which leads to the exclusion of stakeholder perceptions and therefore, makes it impossible to connect ecosystem service demand and supply over time. Moreover, the concept of change that is used most often in the literature is that of regime shifts which comes from a purely ecological background and focuses mostly on changes that happened in the past. This neglects the possibility of change towards a positive outcome in the future. In general, there is a strong disciplinary divide in the concepts and terminology used. This leads to a lack of exchange between different scientific disciplines and non-academic stakeholders. Approaches that are needed to solve problems of ecosystem service management are therefore impeded.
To enable future research to better account for temporal aspects and connect supply and demand sides of ecosystem services with each other, I give four recommendations for future research. These are (I) take temporal dynamics into account by conducting long-term research, (II) ensure conceptual clarity, (III) create a solution-oriented agenda and (IV) take the demand side into account by involving stakeholders’ perceptions over time.
By following these recommendations, future research could help to support the sustainable management of ecosystem services as dynamics will be better known and targeted measures can be implemented.
Die Wichtigkeit, eine soziale Perspektive auf die Mensch-Natur-Beziehung einzunehmen, wird seit langer Zeit erkannt. Die Erforschung sozial-ökologischer Systeme sucht durch den Ausgleich der sozialen und ökologischen Ansichten ein holistisches Verständnis der Mensch-Natur-Beziehung zu erreichen. Hier strebte ich an, ein soziales Verständnis des Sächsischen Gebiets im Herzen Rumäniens zu entwickeln, indem ich erforschte, wie Einheimische die Mensch-Natur-Beziehung betrachten. Zu diesem Zweck verwendete ich die Konzepte der sozial-ökologischen Systeme (SES), der ökosystemischen Leistungen (ES) und der Kulturlandschaften, um die Wahrnehmung der Einheimischen durch empirische Fallstudien zu erfassen. Über eine ausgiebige Recherche bestehender Fachliteratur erstellte ich zuerst eine Übersicht über eine bestimmte Form der Mensch-Natur-Beziehung, in der weder verbrauchbare noch nutzenbringende Werte vorhanden sind (´kulturelle Ökosystemdienstleistungen´). Zweitens, um die Wechselwirkung von dem sozialen zum ökologischen System abzugrenzen und zur Sprache zu bringen, untersuchte ich, wie unterschiedlich die Einheimischen die Landschaften und ihre Funktionen in Südsiebenbürgen wahrnehmen. Diese mit den Landschaften verbundenen Präferenzen verortete ich dann konzeptionell, indem ich die potenzielle Landnutzung und deren Auswirkungen im Hinblick auf das Management verdeutlichte. Drittens, um die Mensch-Natur-Beziehung vom ökologischen zum sozialen System zu erfassen, studierte ich die Nutzung der Ökosystemdienstleistungen durch disaggregierte Personengruppen. Genauer untersuchte ich, welche Faktoren über die ökosystemischen Verfahren und Funktionen hinaus die von der Natur durch den Menschen abgeleiteten Vorteile aus Sicht der potenziellen Nutznießer beeinflussten. Ich entwarf ein Konzept über die vermittelnde Rolle einer Auswahl an zusammenhängenden Faktoren, die der aktuellen Verbreitung der ES in Verbindung mit der Beziehung zwischen den ES und den Vorteilen für den Menschen zugrunde liegen. Viertens, um ein Beispiel der wechselseitigen Mensch-Natur-Beziehung zu erforschen, betrachtete ich einen Sonderfall des Nebeneinanderbestehens von Menschen und Fleischfressern sowie die Mechanismen, welche dieses Miteinander beeinflussen. Auch wenn ich in dieser Dissertation ein umfangreiches und tiefgründiges Verständnis der menschlichen Dimension der untersuchten Systeme ansammelte, wählte ich vier Querthemen, um die Mensch-Natur-Beziehung in Südsiebenbürgen zu erläutern. Diese vier Themen mögen als Grundsäulen eines Verständnisses aus der sozialen Sicht, aber auch als mögliche Ziele für die Forschung oder Politiken dienen. Das erste Thema bezieht sich auf die Werte der Einheimischen, die der Schlüssel des Verständnisses der endemischen Mensch-Natur-Beziehung sind und in künftigen sozial-ökologischen Bewertungen oder politischen Eingriffen nicht zu übersehen sind. Das zweite Thema versteht die Kulturlandschaft in Südsiebenbürgen sowohl als einen physischen als auch einen virtuellen Raum der sozial-ökologischen Wechselwirkung, welcher dem Menschen Naturerfahrungen und sozial-ökologisches Wissens ermöglicht. Das dritte Thema, die Mannigfaltigkeit des sozialen Systems hinsichtlich ihrer Anforderungen an die Landschaft sowie deren Nutznießer der Ökosystemdienstleistungen erweitert die Betrachtungsweise der Mensch-Natur-Beziehungen, kann jedoch zugleich künftig eine Konflikt- oder Entkopplungsquelle sein, wenn sie unangemessen verwaltet wird. Zuletzt spielen die Kleinbauern eine wesentliche Rolle in der Aufrechterhaltung der Mensch-Natur-Beziehung dank ihrer Interaktion mit dem Land und den daraus hervorgegangenen Überzeugungen, aber ihre Werte und ihr Lebensstil sind bedroht.
Many fewer women than men try the entrepreneurial way in Germany. Any explanation for this phenomenon must be complex, as many factors are relevant for its production. Among other things, it is possible to speculate on sexual/gender discrimination, on more or less voluntary decisions of women or on different starting conditions for potential entrepreneurs. We assume that these options are closely related. This paper will concentrate, though, on the third alternative. Its focus will be set on the “family field,” or more precisely, on the role of family law in hindering women from trying self-employment. The family field in Germany has not evolved in the sense of gender equality along with all other areas of society - e.g., entrepreneurship. No gender equality is possible if the family field is not part of it. This paper analyses causes and consequences for this phenomenon.
Key Words: Gender studies, Family Law, Entrepreneurship, chance equality, social sustainability