- About
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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.
Search results
Showing 11 to 19 of 19 (0.008 seconds)| 11 |
Fire History and Natural Succession after Forest Fires in Pine-Oak Forest: / An Investigation in the Ecological Park Chipinque, Northeast Mexico / Waldbrandgeschichte und natürliche Sukzession nach Waldbränden in Kiefern-Eichen-Mischwäldern: / Eine Untersuchung in dem Naturpark Chipinque, Nordost-MexikoGonzález Tagle, Marco Aurelio 24 February 2005 (has links)
No description available.
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Untersuchungen und Kalkulationstabellen zur Schätzung der N2-Fixierleistung und der N-Flächenbilanz beim Anbau von Lupinus albus und Lupinus luteus in Reinsaat und von Vicia faba und Pisum sativum in Reinsaat und im Gemenge mit Avena sativa / Estimation of the nitrogen fixation and the N balance in cultivations of Lupinus albus and Lupinus luteus as sole crops and of Vicia faba and Pisum sativum as sole crops and in mixed stands with Avena sativa - resarches and calculation charts -Jost, Britta 11 July 2003 (has links)
No description available.
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Development of efficient forest inventory techniques for forest resource assessment in South Korea / Entwicklung effizienter Inventurmethoden zur großräumigen Erfassung von Waldressourcen in Süd-KoreaYim, Jong-Su 12 December 2008 (has links)
No description available.
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Response of the understorey vegetation to selection cutting and clear cutting in the initial phase of Norway spruce conversion / Reaktion der Bodenvegetation nach Zielstärkennutzung und Kahlschlag in der Initialphase des Umbaus von FichtenreinbeständenHeinrichs, Steffi 17 March 2010 (has links)
No description available.
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Phytodiversity in Short Rotation Coppice plantations / Phytodiversität in KurzumtriebsplantagenBaum, Sarah 08 June 2012 (has links)
No description available.
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Zur Struktur und Diversität der Bodenvegetation in Laubwäldern mit unterschiedlicher Baumartenvielfalt / On the structure and diversity of herb-layer vegetation in deciduous forests with contrasting tree-species diversityMölder, Andreas 13 June 2008 (has links)
No description available.
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Land-use Change in the Central Highlands of Vietnam / A spatial econometric model combining satellite imagery and village survey data / Landnutzungsveränderungen im Zentralen Hochland Vietnams / Ein räumliches ökonometrisches Modell unter Verwendung von Satellitendaten und einer DorfumfrageMüller, Daniel 22 May 2003 (has links)
No description available.
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Water turnover in species-rich and species-poor deciduous forests: xylem sap flow and canopy transpiration / Wasserumsatz in artenreichen und artenarmen Laubwäldern: Xylemsaftfluss und Kronendach-TranspirationGebauer, Tobias 20 February 2009 (has links)
No description available.
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Risk management in semi-arid rangelands: Modelling adaptation to spatio-temporal heterogeneitiesJakoby, Oliver 07 December 2011 (has links)
Livestock grazing is the most important type of land-use in arid and semi-arid regions. In these regions, uncertain and highly variable climate conditions cause scarce and spatio-temporally variable resource availability. The major challenge to livestock grazing is the efficient utilisation of these resources without running the risk of degradation. Therefore, well adapted grazing strategies that consider both local environmental characteristics and the farmers' individual needs and perceptions are crucial for sustaining human livelihoods. Particularly, rotational grazing is presumed to render adaptation to spatio-temporal heterogeneities possible. A systematic investigation, however, that analyses the interrelations between the major components of rotational grazing systems on appropriate spatial and temporal scales was missing so far.
This doctoral thesis investigates different management strategies for sustainable livestock grazing in semi-arid rangelands. Using an integrated modelling approach, it enters into the question: how to adapt grazing systems to spatio-temporal heterogeneous rangeland conditions, variable and changing climate conditions, and different individual needs and goals of livestock farmers?
In order to address these issues, the taken approach tackles both methodical challenges and applied concerns. In the first part of this study, a generic modelling framework is developed that incorporates important components of grazing systems on appropriate spatial and temporal scales. To parameterise the model, a pattern-oriented approach is developed that uses qualitative patterns to derive a broad range of plausible parameter sets supporting a general model analysis.
In the second part, a variety of management strategies is explored under different climatic, ecological, and economic conditions. The research focuses in particular on combined effects between and relative importance of different management components. The question how the results of different management strategies depend on the type of vegetation is investigated. Furthermore, the performance of rotational grazing strategies is analysed under different economic requirements and rainfall conditions. The study also identifies management strategies that are suitable to adapt a grazing system to spatio-temporally variable rangeland conditions.
Overall, this thesis contributes to a general understanding of basic principles for adaptation to spatio-temporal heterogeneities as well as the interplay of different management components. The results allow an evaluation of management strategies for specific situations and the identification of strategies that are robust to a broad range of situations including different aspects of global change.
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