Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"sink and source"”.
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Dynamic chamber system for determining equilibrium phosphorus concentration (EPC0) in sediments
… have presented significant social, economic and ecological challenges to humanity. Phosphorus (P) is a common limiting nutrient in North American freshwater lakes including the Laurentian Great Lakes that is transported to receiving waters by rivers and streams, especially those adjacent to …
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Investigation of the Volga River sediments composition : inorganic pollutants of potential concern
… investigations of the inorganic (this report) and organic pollution (conducted by the working group of Prof. H.F. Schöler) of the Volga rivers aquatic sediments were carried out. Starting with the work of Züllig (1956) sediments have been recognized and used extensively as an almost ideal …
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The Control of the Root to Shoot Ratio of Radish (Raphanus sativus L.)
… Analysis of indol-3yl-acetic acid (lAA) and gibberellin levels in radish through its vegetative cycle revealed that shoot hormone levels, initially high, declined with time to become lower than the levels in the root. Thus, the ratio of shoot to root hormone content changed from a high to …
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Dynamics of soil processes under extreme meteorological boundary conditions - response of below-ground carbon, sulfur, and iron cycling in fen soils
Northern peatlands store approximately 30 % of the global soil carbon stocks. On the other hand, peatlands contribute about 3-10 % to the global methane burden into the atmosphere. Climate predictions foresee not only an increase in the global mean temperature, but also a change in precipitation …
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Molecular Characterization of Sugarcane Yellow Leaf Virus (SCYLV) and its Effect on Sucrose Transporters in Sugarcane Saccharum spp. hybrids
Sugarcane is an important crop plant and has served as a source of sugar for hundreds of years, recently it is used to produce bioethanol, a renewable bio-fuel energy source. Sugarcane yellow leaf virus (SCYLV) was detected in the late 1990s first in Hawaii as a causal agent of a sugarcane disease …
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Interactions between hydrology and biogeochemistry within riparian wetlands
Interactions between hydrology and biogeochemistry at various spatio-temporal scales are important control mechanisms within terrestrial and aquatic ecosystems and exist among different compartments and transition interfaces. Understanding the fundamental mechanistic couplings between hydrological …
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Die ökologische Bedeutung von Hecken für Vögel
Hecken sind kulturhistorisch und landschaftsästhetisch bedeutsame Elemente unserer Kulturlandschaft und sind in Ermangelung von natürlichen Lebensräumen für viele Tier- und Pflanzenarten wichtige Lebensräume geworden. Die Bedeutung von Hecken für Vögel als Rast- und Schlafplatz, Schutz- und …