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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Structure and restoration of natural secondary forests in the Central Highlands, Vietnam

Bui, Manh Hung 15 December 2016 (has links) (PDF)
Introduction and objectives In Vietnam, the forest resources have been declining and degrading severely in recent years. The degradation has decreased the natural forest area, changed the forest structure seriously and reduced timber volume and biodiversity. From 1999 to 2005, the rich forest area has decreased 10.2%, whereas the poor secondary forest has increased dramatically by 20.7%. Forest structure plays an important role in forestry research. Understanding forest structure will unlock an understanding of the history, function and future of a forest ecosystem (Spies, 1998). The forest structure is an excellent basis for restoration measures. Therefore, this research is necessary to contribute to improving forest area and quality, reducing difficulties in forest management. The study also enhances the grasp of forest structure, structure changes after harvesting and fills serious gaps in knowledge. In addition, the research results will contribute to improving and rescuing the poor secondary forest and restoring it, approaching the old-growth forest in Vietnam. Material and methods The study was conducted in Kon Ka Kinh national park. The park is located in the Northeastern region of Gia Lai province, 50 km from Pleiku city center to the Northeast. The park is distributed over seven different communes in three districts: K’Bang, Mang Yang and Đăk Đoa. Data were collected from 10 plots of secondary forests (Type IIb) and 10 plots of primeval forests (Type IV). Stratified random sampling was applied to select plot locations. 1 ha plots were used to investigate gaps. 2000 m2 plots were used to measure overstorey trees such as diameter at breast height, total height, crown width and species names. 500 m2 subplots were used to record tree positions. For regeneration, 25 systematic 4 m2 subplots were established inside 1 ha plots. After data were collected in the field, data analyses were conducted by using R and Excel. Firstly, some stand information, such as density, volume and so on, was calculated, and then descriptive statistics were computed for diameter and height variables. Linear mixed effect models were applied to analyze the difference of diameter and height and to check the effect of random factor between the two forest types. Diameter and height frequency distributions were also generated and compared by using permutational analysis of variance (PERMANOVA). Non-linear regression models were analyzed for diameter and height variables. Similar analyses were implemented for gaps. Regarding spatial point patterns of overstorey trees, replicated point pattern analysis techniques were applied in this research. For biodiversity, some calculations were run such as richness and biodiversity indices, comparison of biodiversity indices by using linear mixed models and biodiversity differences between two forest types tested again by permutational analysis of variance. In terms of regeneration, some analyses were implemented such as: height frequency distribution generation, frequency difference testing, biodiversity indices for the regeneration and spatial distribution checking by using a nonrandomness index. Results and discussion After analyzing the data, some essential findings were obtained as follows: Hypothesis H1 “The overstorey structure of secondary forests is more homogeneous and uniform than old-growth forests” is accepted. In other words, the secondary forest density is about 1.8 times higher than the jungle. However, the volume is only 0.56 times as large. The average diameter and height of the secondary forest is smaller by 5.71 cm and 3.73 m than the old-growth forest, respectively. Linear mixed effect model results indicate that this difference is statistically different and the effect of the random factor (Section) is not important. Type IIb has many small trees and the diameter frequency distribution is quite homogeneous. The old-growth forest has more big trees. For both forest stages, the height frequency distribution is positively skewed. PERMANOVA results illustrate that the frequency distribution is statistically different between the two forest types. Regression functions are also more variant and diverse in the old-growth forest, because all standard deviations of the parameters are greater there. Gap analysis results indicate that the number of gaps in the young forest is slightly higher, while the average gap size is much smaller. The gap frequency distribution is statistically different between the two types. In terms of the spatial point pattern of overlayer trees, the G-test and the pair correlation function results show that trees distribute randomly in the secondary forest. In contrast, the spatial point patterns of trees are more regular and diverse in the old-growth forest. The spatial point pattern difference is not significant, and this is proved by a permutational t-test for pair correlation function (pcf). Envelope function results indicate that the variation of pcf in young forests is much lower than in the primary forests. Hypothesis H2 “The overstorey species biodiversity of the secondary forest is less than in the old-growth forest” is rejected. Results show that the number of species of the secondary forest is much greater than in the old-growth forest, especially richness. The richness of the secondary forest is 1.16 times higher. The Simpson and Shannon indices are slightly smaller in the secondary forest. The average Simpson index for both forest stages is 0.898 and 0.920, respectively. However, the difference is not significant. Species accumulation curves become relatively flatter on the right, meaning a reasonable number of plots have been observed. Estimated number of species from accumulation curves in two forest types are 105 and 95/ha. PERMANOVA results show that number of species and proportion of individuals in each species are significantly different between forest types. Hypothesis H3 “The number regenerating species of the secondary forest is less and they distribute more regularly, compared to the old-growth forest” is rejected. There are both similarities and differences between the two types. The regeneration density of the stage IIb is 22,930 seedlings/ha, greater than the old forest by 9,030 seedlings. The height frequency distribution shows a decreasing trend. Similar to overstorey, the richness of the secondary forest is 141 species, higher than the old-growth forest by 9 species. Biodiversity indices are not statistically different between two types. PERMANOVA results indicate that the number of species and the proportion of individuals for each species are also not significantly different from observed forest types. Nonrandomness index results show that the regeneration distributes regularly. Up to 95% of the plots reflect this distribution trend. Hypothesis H4 “Restoration measures (with and without human intervention) could be implemented in the regenerating forest” is accepted. The investigated results show that the secondary forest still has mother trees, and it has enough seedlings to restore. Therefore, restoration solutions with and without human intervention can be implemented. Firstly, forest protection should be applied. This measure is relevant to national park regulations in Vietnam. Rangers and other related organizations will be responsible for carrying out protection activities. These activities will protect forest resources from illegal logging, grazing and tourist activities. Environmental education and awareness-raising activities for indigenous people is also important. Another measure is additional and enrichment planting. It should focus on exclusive species of the overstorey in Type IIb or exclusive species of the primary forest. Selection of these species will lead to species biodiversity increase in the future. This also meets the purpose of the maximum biodiversity solution. Conclusion Forest resources play a very important role in human life as well as maintaining the sustainability of ecosystems. However, at present, they are under serious threat, particularly in Vietnam. Central Highland, Vietnam, where forest resources are still relatively good, is also threatened by illegal logging, lack of knowledge of people and so on. Therefore, it needs the hands of the people, especially foresters and researchers. Through research, scientists can provide the knowledge and understanding of the forest, including the structure and forest restoration. This study has obtained important findings. The secondary forest is more homogeneous and uniform, while the old-growth forest is very diverse. Biodiversity of the overstorey in the secondary forest is more than the primary. The number of regenerating species in the secondary forest is higher, but other indices are not statistically different between two types. The regeneration distribute regularly on the ground. The secondary forest still has mother trees and sufficient regeneration, so some restoration measures can be applied here. Findings of the study contribute to improve people’s understanding of the structure and the structural changes after harvesting in Kon Ka Kinh national park, Gia Lai. That is a key to have better understandings of the history and values of the forests. These findings and the proposed restoration measures address rescuing degraded forests in Central Highland in particular and Vietnam in general. And further, this is a promising basis for the management and sustainable use of forest resources in the future.
2

Stakeholder Analysis in Sustainable Forest Management in Sabah, Malaysia

Lintangah, Walter 02 June 2014 (has links) (PDF)
The Sustainable Forest Management (SFM) was first introduced in all commercial forest reserves in Sabah in 1997. This policy gives hope to the state government to manage the forests in a sustainable manner following the forest development phase of revenue oriented timber exploitation, which has contributed to the decline in forest resources; the increase in forest degradation and the decrease in state income earned from the forestry sector. Under the SFM concept, the forest of the state was divided into Forest Management Units (FMUs) managed by FMU holders under different institutional arrangements of state, state enterprise and private sector. This study was conducted to investigate the corporate-stakeholder interrelation under the SFM concept implemented by the FMU holder in Sabah, Malaysia. The research was based on the ‘Triple Typology Perspective of Stakeholder Theory’, which encapsulates three different perspectives of ‘conceptual’, ‘corporate’ and ‘stakeholder’ centric. The ‘conceptual’ perspective explores the overall SFM concept and its relation to the FMU holder – stakeholder interaction. The ‘corporate’ view investigates how the FMU holders as the corporate part of the SFM concept deals with their stakeholders; and the ‘stakeholder’ perspective analyses the relation between stakeholders, the FMU holders and SFM implementation. Stakeholder analysis was used to gather information with the application of methods incorporating literature reviews, expert interviews, focus groups, meetings and discussion, questionnaire surveys and Q methodology. Four FMUs were selected as study areas, which managed by the state, state enterprise and private sector. The respondents were encompassed personal of Sabah Forestry Department (SFD), FMU managers and FMU workers, various governmental and non-governmental agencies, and local communities of eight villages located within and in the fringe of FMU areas involved in the study. Under the ‘conceptual centric’, different groups of stakeholders were identified based on SFM documentation, which also provide the normative basis for the SFM concept. The contemporary implementation of SFM was assessed based on stakeholders’ perspective, which indicated that the overall SFM contribution entailed mainly on satisfaction of environment objectives, followed by economic and, to a lesser degree, social objectives. Different categories of stakeholders were identified based on their perceptions of various issues under SFM implementation. These include the level of cooperation or conflict; degree of stakeholder participation; views of specific individuals and a thorough comparison of individual subjectivity. There is, however, an agreement to the statements on the influential factors towards effective SFM implementation, which include the administration and leadership of SFD, and good collaboration between SFD and the FMU holders. Other consensuses were related to the roles of participation in promoting learning about synergy and the importance of various forest uses, and that it should be able to influence the decision-making during the consultation process. The implementation of SFM was agreed in influencing towards investment in the forestry sector and the development of the rural area in the state. The ‘corporate centric’ indicates the different approaches of stakeholder management under the different arrangements of FMU holders. The SFM operations with a high level of stakeholder involvement were identified as community forestry programme followed by forest conservation, forest protection, development and preparation of plans, administration, human resource development, and research and development. The important stakeholders, according to their degree of involvement in SFM operations were the internal stakeholders of FMU workers, followed by external stakeholders of the staff of SFD, contractors, local communities, local authorities, consultants, businessmen/traders and researchers/scientists. Other stakeholders were various state government agencies, manufacturers, shareholders, NGOs (local), international agencies, NGOs (international), donors, federal government agencies and other FMU holders. The ‘stakeholder centric’ identifies the various stakeholders interests and claims associated with SFM implementation that depend on stakeholder affiliation. The main groups in this study were multi-interest stakeholder groups (n=104) and the local community groups of the selected villages (n=332). The interests and claims of the multi-interest stakeholder group were related to SFM objectives such as good management of the forest, protection and conservation of environment and biodiversity, and protection of water catchment areas. The local community groups, on the other hand, were mainly concerned with the importance of the forest as a source for foods, land for agriculture and other livelihood purposes. There are various approaches for stakeholder relation management (SRM) that are employed by the FMU holders and stakeholders. These may consist of management quality system, CSR program, the community forest development project; inter agency meetings and dialogue; and collaboration and cooperation with other agencies and institutions. SRM can assist in balancing conflicts that arise, promoting cooperation, and advancing the knowledge and understanding on the SFM concept among the stakeholders. The SRM approaches under the SFM implementation can augment participation by the stakeholders, which in turn will promote effective and efficient implementation of SFM. The mutual relation of the SFM concept and SRM is advancing stakeholder participation in promoting effective implementation of SFM at the FMU level. The inter-relation of the ‘triple perspective typology of stakeholder theory’ was integrated as new contexts to achieve objectives for sustainability under SFM policy, with the business case of corporate sustainability, and the wider scope of the ecosystem approach and the sustainable development. / Das Konzept Sustainable Forest Management (SFM) wurde erstmals in allen kommerziellen Waldreservaten in Sabah, Malaysia, im Jahr 1997 eingeführt. Mit dieser Politik verbindet die Landesregierung die Hoffnung, dass die Wälder nun in einer nachhaltigen Art und Weise bewirtschaftet werden können, nachdem die fast ausschließlich auf Einnahmen orientierte Holznutzung zum Rückgang der Waldbestände, zur Zunahme der Waldzerstörung und damit letztendlich auch zum Rückgang der Staatseinnahmen aus der Forstwirtschaft beigetragen hat. Zur Umsetzung des SFM-Konzepts wurde der Staatswald in Forest Management Units (FMU) unterteilt, die von FMU Haltern aus verschiedenen Staatsinstitutionen, Staatsunternehmen und der Privatwirtschaft verwaltet werden. Die vorliegende Arbeit untersucht das Verhältnis zwischen Unternehmen als FMU-Bewirtschaftern und Stakeholdern im Konzept nachhaltiger Waldbewirtschaftung, das von FMUs in Sabah, Malaysia implementiert wurde. Die Arbeit basiert auf der „Triple-Typology Perspective of Stakeholder Theory“, welche drei verschiedene Perspektiven beinhaltet, die konzeptionell, unternehmensbezogen oder Stakeholder-zentriert sind. Dabei untersucht die konzeptionelle Perspektive SFM-Konzepte und die daraus resultierenden Beziehungen zwischen FMU-Bewirtschafter und ihren jeweiligen Stakeholdern. Die unternehmenszentrierte Sicht legt den Schwerpunkt darauf, wie FMU-Bewirtschafter als Teil des SFM-Konzeptes mit Stakeholdern interagieren. Die Stakeholder-Perspektive analysiert das Verhältnis zwischen Stakeholdern, FMU-Bewirtschafter und der SFM-Implementierung. Die Daten wurden mit Hilfe der Stakeholder-Theorie unter Anwendung quantitativer und qualitativer Methoden wie Literaturrecherche, Experteninterviews, Fokusgruppen, informellen Treffen und Diskussionsrunden, schriftlichen Befragungen und der Q-Methodologie erhoben. Als Untersuchungseinheiten wurden vier FMUs ausgewählt, die durch den Staat, den staatlichen Forstbetrieb und den privatem Sektor bewirtschaftet werden. Die Befragungsteilnehmer setzten sich aus Personal der Forstverwaltung Sabah (Sabah Forestry Department, SFD), den FMU-Bewirtschaftern und –Mitarbeitern, verschiedenen Regierungs- und Nicht-Regierungsorganisationen und lokalen Gemeinschaften in acht Dörfern innerhalb sowie im Randgebiet der FMUs zusammen. In Bezug auf die konzeptionelle Perspektive wurden, basierend auf der SFM-Dokumentation, verschiedene Stakeholder-Gruppen identifiziert, die die normative Basis für das SFM-Konzept liefern. Dessen Implementation wurde aus Sicht der Stakeholder analysiert. Es zeigte sich, dass der gesamte Beitrag zum SFM vornehmlich umweltbezogene Zielsetzungen erfüllt, gefolgt von ökonomischen und, zu einem noch geringeren Grad, sozialen Zielen. Mehrere Kategorien von Stakeholdern wurden auf Grundlage ihrer Wahrnehmung verschiedener Aspekte im Zuge der SFM-Implementation identifiziert. Diese umfassen die Kooperations- oder Konfliktebene, den Grad der Stakeholder-Beteiligung sowie individuelle Betrachtungen. Es gibt eine Übereinstimmung zu Äußerungen, welche Einflussfaktoren hinsichtlich effektiver SFM-Implementierung entscheidend sind. Dabei wurden vor allem das Management und die Führung der, der SFD sowie gute Zusammenarbeit zwischen dem SFD und den FMU-Bewirtschaftern genannt. Weitere Übereinstimmung besteht darin, die Weiterbildung über die Bedeutung unterschiedlicher Waldnutzungen und deren Ausbalancierung zu stärken, um die Entscheidungsfindung im Konsultationsprozess beeinflussen zu können. Auch herrschte Einigkeit darin, durch Investition in den Forstsektor und Entwicklung ländlicher Regionen die Implementation von SFM zu stärken. Der unternehmensbezogene Fokus konzentriert sich auf die verschiedenen Ansätze des Stakeholder-Managements unter unterschiedlichen Charakteristika der FMU-Bewirtschafter. SFM-Maßnahmen mit einem hohen Grad an Stakeholder-Beteiligung sind Gemeinschaftsforstprogramme (community forestry programmes), gefolgt von Waldnaturschutz, Waldschutz, Entwicklung und Vorbereitung von Plänen, Verwaltung, die Entwicklung von Humanressourcen sowie Forschung und Entwicklung. Die wichtigsten Stakeholder, bezogen auf ihren Beteiligungsgrad in SFM-Maßnahmen, waren intern die Mitarbeiter der FMUs und extern die Mitarbeiter der SFD, Vertragsnehmer, lokale Gemeinschaftsgruppen und Verwaltungen, Berater, Geschäftsleute/Händler und Forscher/Wissenschaftler. Weitere Stakeholder waren verschiedene Regierungsorganisationen, Produzenten, Aktionäre, internationale Behörden, lokale und internationale NGOs, Behörden der föderalen Regierung und andere FMU-Bewirtschafter. Die Stakeholder Perspektive identifiziert verschiedene Interessen und Forderungen der Stakeholder, die sich auf die SFM-Implementation beziehen und von der Stakeholder-Zugehörigkeit abhängen. Die Hauptgruppen in dieser Studie waren sogenannte Mehrinteressen-Stakeholder-Gruppen (n=104) und lokale Gemeinschaftsgruppen (n=332). Die Interessen und Forderungen der Mehrinteressen-Stakeholder-Gruppen waren bezogen auf SFM-Ziele wie gute Waldbewirtschaftung, Schutz und Erhaltung der Umwelt und Biodiversität sowie Schutz von Wassereinzugsgebieten. Andererseits stand der Wald als Quelle für Nahrung, landwirtschaftliche Flächen und andere Aspekte des Lebensunterhaltes im Mittelpunkt des Interesses lokaler Gemeinschaftsgruppen. Es gibt zahlreiche Ansätze für das Management von Stakeholder-Beziehungen (Stakeholder Relation Management, SRM), welches durch FMU-Bewirtschafter und Stakeholder genutzt wird. Der SRM-Ansatz besteht aus dem Bewirtschaftungsqualitätssystem, CSR-Programm, dem Gemeinschaftswaldentwicklungsprojekt, multilateralen Treffen und Dialog zwischen den Behörden, und Zusammenarbeit und Kooperation mit anderen Behörden und Organisationen. SRM kann dazu dienen, mögliche Konflikte auszubalancieren, Kooperation zu begünstigen sowie das Wissen und Verständnis von SFM zu fördern. Die Einbindung von SRM in die Implementation von SFM erweitert die Beteiligung der Stakeholder, was wiederum zu einer effektiveren und effizienteren Implementation von SFM auf FMU-Ebene führen kann. Die Wechselbeziehungen zwischen der „Triple-Perspective Typology of Stakeholder Theory“ und dem Ökosystemansatz, der unternehmensbezogenen Nachhaltigkeit und dem Konzept des Sustainable Forest Management bilden die Grundlage, um das Ziel einer umfassenden Nachhaltigkeit zu erreichen.
3

Changing Paradigms in a Changing Climate

Szulecka, Julia 24 November 2015 (has links) (PDF)
Die vorliegende Studie analysiert die Politische Ökonomie von Forstplantagen in den Tropen. Die Analyse der Makroebene zeigt dabei eine globale Perspektive auf, sowie historische Veränderungen von Paradigmen in Bezug zu Waldplantagen. Der zweite Teil der Studie analysierte Plantagen auf der Mikro-Ebene im Hinblick auf divergente geographischen Zusammenhänge, nämlich Paraguay und Indonesien. Fallstudien eignen sich hierbei, um ein vielfältiges Spektrum von Waldplantagen darzustellen, sowie Beispiele für die in der Makroebene abgeleiteten Paradigmen zu illustrieren. Abschließend verbindet die Studie die Entwicklungen der Makro-Ebene mit Belegen aus der Mikro-Analyse. Hierauf ableitend werden Empfehlungen für die Anlage zukünftiger Plantagen getätigt. Die Methodik wurde den Untersuchungsebenen in einem iterativen Prozess angepasst. Der Umfang variiert dabei von Makro- bis Mikroanalysen, sowie vom theoretischen bis zum empirischen Niveau. Auf der Makroebene wurde eine Politische-Ökonomie-Analyse und eine Untersuchung desrelevanten historischen Materials durchgeführt. Weiterhin wurden Plantagen Paradigmen anhand ausgewählter Indikatoren abgegrenzt. Für die Mikroebene wurden Fallstudien mit lokalen Interviews durchgeführt, welche Daten für eine Mehrkriterienanalyse (MCA) lieferten. Die Kombination der Mikro- und Makroanalyse erfolgte durch eine Korrelationsanalyse und wurde durch eine Diskussion abgerundet. Das Forschungsergebnis aus der globalen Analyse ist eine Typologie von sechs Paradigmen und deren Untervarianten, welche als theoretisches und analytisches Werkzeug in der Forschung zu Plantagen dienen können. Die Paradigmen wurden klassifiziert als: i) das vorindustrielle P.; ii) das kolonial industrielle und national industrielle; iii) das Schutzparadigma; iv) das soziale P.; v) das neo-liberale und modifiziert neoliberale P. und vi) das globalpolitische Paradigma. Die Ergebnisse der Fallstudien und MCA zeigen zum einen sichtbare Mängel in Plantagen unter verschiedenen Paradigmen auf und unterstreichen zum anderen positive Effekte bestimmter Paradigmen. Die MCA Bewertungspunkte zeigen zum Beispiel, dass manche Paradigmen mit dem Kriterium Landkonflikt korrelieren, oder präsentieren unterschiedliche lokale Beteiligung auf verschiedenen Plantagen, illustrieren Vorteile, die Plantagen für unterschiedliche Interessengruppen bringen. Die MCA bewertet weiter die Wirtschaftsleistung der Plantagen und vergleicht Faktoren, wie Nutzenverteilung, Rentabilität, Marktzugang und Rahmenbedingungen für Investitionen. Sie analysiert soziale Faktoren, wie Arbeitssicherheit, Zugang zu Dienstleistungen, Beteiligung oder Personalmanagement. Weiterhin werden Umweltprobleme durch die Studie aufgegriffen, z.B. Landnutzungsänderungen, Wasser- oder Boden- Auswirkungen, Lebensraumfunktion usw. Wie die vergleichende Analyse zeigt, ist die modifizierte Neoliberale Paradigma Plantage (Outgrower-Scheme) besonders geeignet, um sowohl soziale als auch wirtschaftliche Vorteile zu sichern (90 % und 84 % in den entsprechenden Feldern gegenüber dem hypothetischen Idealtyp Plantage). Andere Forschungsergebnisse deuten auf wichtige Erkenntnisse bei der Plantagenentwicklung hin, die auf der Plantagen-Ebene und bei der Gestaltung nationaler Rahmenbedingungen für den Plantagensektor berücksichtigt werden sollten. Handlungsempfehlungen für die forstwirtschaftliche, epistemische Gemeinschaft zur Gestaltung der weiteren Diskurse in Bezug auf globalen Plantagen werden ebenfalls diskutiert.

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