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You searched for subject:(cycle of deposition). Showing records 1 – 3 of 3 total matches.

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Johannes Gutenberg Universität Mainz

1. Wullaert, Hans. Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments.

Degree: 2010, Johannes Gutenberg Universität Mainz

Atmospheric nitrogen (N) and phosphorus (P) depositions are expected to increase in the tropicsrnas a consequence of increasing human activities in the next decades. Furthermore, a possiblernshortened El Niño Southern Oscillation cycle might come along with more frequent calcium (Ca)rndepositions on the eastern slope of the Ecuadorian Andes originating from Saharan dust. It isrncrucial to understand the response of the old-growth montane forest in Ecuador to increasedrnnutrient deposition to predict the further development of this megadiverse ecosystem.rnI studied experimental additions of N, P, N+P and Ca to the forest and an untreatedrncontrol, all in a fourfold replicated randomized block design. These experiments were conductedrnin the framework of a collaborative research effort, the NUtrient Manipulation EXperimentrn(NUMEX). I collected litter leachate, mineral soil solution (0.15 and 0.30 m depths), throughfallrnand fine litterfall samples and determined N, P and Ca concentrations and fluxes. This approachrnalso allowed me to assess whether N, P and/or Ca are limiting nutrients for forest growth.rnFurthermore, I evaluated the response of fine root biomass, leaf area index, leaf area and specificrnleaf area, tree diameter growth and basal area increment contributed from a cooperating group inrnthe Ca applied and control treatments.rnDuring the observation period of 16 months after the first fertilizer application, less thanrn10, 1 and 5% of the applied N, P and Ca, respectively, leached below the organic layer whichrncontained almost all roots but no significant leaching losses occurred to the deeper mineral soil.rnDeposited N, P and Ca from the atmosphere in dry and wet form were, on balance, retained in therncanopy in the control treatment. Retention of N, P and Ca in the canopy in their respectiverntreatments was reduced resulting in higher concentrations and fluxes of N, P and Ca inrnthroughfall and litterfall. Up to 2.5% of the applied N and 2% of the applied P and Ca werernrecycled to the soil with throughfall. Fluxes of N, P and Ca in throughfall+litterfall were higher inrnthe fertilized treatments than in the control; up to 20, 5 and 25% of the applied N, P and Ca,rnrespectively, were recycled to the soil with throughfall+litterfall.rnIn the Ca-applied plots, fine root biomass decreased significantly. Also the leaf area of thernfour most common tree species tended to decrease and the specific leaf area increasedrnsignificantly in Graffenrieda emarginata Triana, the most common tree species in the study area.rnThese changes are known plant responses to reduced nutrient stress. Reduced aluminium (Al)rntoxicity as an explanation of the Ca effect was unlikely, because of almost complete organocomplexationrnof Al and molar Ca:Al concentration ratios in solution above the toxicity threshold.rnThe results suggest that N, P and Ca co-limit the forest ecosystem functioning in thernnorthern Andean montane forests in line with recent assumptions in which different ecosystemrncompartments and even different…

Subjects/Keywords: Bergregenwald; Nährstoffzyklus; Deposition von N, P und Ca; Umweltänderung; Aluminium-Toxizität; montane rainforest; nutrient cycle; deposition of N, P and Ca; environmental change; aluminium toxicity; Natural sciences and mathematics

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APA (6th Edition):

Wullaert, H. (2010). Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments. (Doctoral Dissertation). Johannes Gutenberg Universität Mainz. Retrieved from http://ubm.opus.hbz-nrw.de/volltexte/2010/2312/

Chicago Manual of Style (16th Edition):

Wullaert, Hans. “Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments.” 2010. Doctoral Dissertation, Johannes Gutenberg Universität Mainz. Accessed April 12, 2021. http://ubm.opus.hbz-nrw.de/volltexte/2010/2312/.

MLA Handbook (7th Edition):

Wullaert, Hans. “Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments.” 2010. Web. 12 Apr 2021.

Vancouver:

Wullaert H. Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments. [Internet] [Doctoral dissertation]. Johannes Gutenberg Universität Mainz; 2010. [cited 2021 Apr 12]. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2010/2312/.

Council of Science Editors:

Wullaert H. Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments. [Doctoral Dissertation]. Johannes Gutenberg Universität Mainz; 2010. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2010/2312/


McMaster University

2. Eggertson, E. Bruce. The Espanola Formation: A Proterozoic Carbonate North of Lake Huron, Ontario.

Degree: 1975, McMaster University

The Proterozoic Espanola Formation (Huronian Sequence) was studied at Geneva Lake, Ontario, 45 miles north-west of Sudbury. A major lithological change exists in the Espanola Formation between this area and the type section on the north shore of Lake Huron, 75 miles to the south. Unusually pure (95 percent) microcrystalline limestones and dolostones occur in almost equal abundance to the calcareous siltstones which are the characteristic lithology of the formation in its type section. The existence and position of a fine grained deposit such as the Espanola in a stratigraphic sequence which consists mostly of glacial and periglacial deposits is unusual. It is suggested that this fine-grained deposit was an integral part of a cycle of deposition resulting from glacial advance and retreat and that its sedimentary basin was created by marine transgression in response to a glacial retreat. Spatial distribution of the Espanola Formation suggests that its sedimentary basin may have consisted of at least three environmental zones. At least one of these zones may represent a glacial melt-water lake. A microfossil search was carried out with negative results. This made speculation necessary in determining the origin of the calcareous fraction of the Espanola Formation. A mechanism is suggested whereby calcium carbonate is precipitated inorganically, as a result of photosynthesis by anaerobic bacteria. This mechanism can be observed in the present. If it is true, then the Espanola Formation may represent a time marker for the first presence of free oxygen in the atmosphere.

Thesis

Bachelor of Science (BSc)

Advisors/Committee Members: Risk, M. J., Clifford, P. M., Geology.

Subjects/Keywords: Proterozoic Espanola Formation; Huronian Sequence; Geneva Lake; lithology; Espanola; cycle of deposition; glacial advance and retreat; calcium carbonate precipitation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Eggertson, E. B. (1975). The Espanola Formation: A Proterozoic Carbonate North of Lake Huron, Ontario. (Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/17756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Eggertson, E Bruce. “The Espanola Formation: A Proterozoic Carbonate North of Lake Huron, Ontario.” 1975. Thesis, McMaster University. Accessed April 12, 2021. http://hdl.handle.net/11375/17756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Eggertson, E Bruce. “The Espanola Formation: A Proterozoic Carbonate North of Lake Huron, Ontario.” 1975. Web. 12 Apr 2021.

Vancouver:

Eggertson EB. The Espanola Formation: A Proterozoic Carbonate North of Lake Huron, Ontario. [Internet] [Thesis]. McMaster University; 1975. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/11375/17756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Eggertson EB. The Espanola Formation: A Proterozoic Carbonate North of Lake Huron, Ontario. [Thesis]. McMaster University; 1975. Available from: http://hdl.handle.net/11375/17756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


ETH Zürich

3. Hischier, Roland. Life cycle assessment of manufactured nanomaterials: Inventory modelling rules and application example.

Degree: 2013, ETH Zürich

Subjects/Keywords: PHYSICAL VAPOUR DEPOSTION, PVD (PHYSIK VON MOLEKULARSYSTEMEN); FALLSTUDIEN (DOKUMENTENTYP); CASE STUDIES (DOCUMENT TYPE); ENVIRONMENTAL INVENTORIES (ENVIRONMENTAL PROTECTION); FELDEMISSIONSANZEIGEN (ELEKTRONIK); NANOSTRUKTURIERTE MATERIALIEN (PHYSIK DER KONDENSIERTEN MATERIE); PHYSICAL VAPOUR DEPOSITION, PVD (PHYSICS OF MOLECULAR SYSTEMS); ÖKOBILANZEN + ÖKOLOGISCHE BUCHHALTUNG (UMWELTSCHUTZ); NANOSTRUCTURED MATERIALS (CONDENSED MATTER PHYSICS); FIELD EMISSION DISPLAYS, FED (ELECTRONICS); ÖKOINVENTARE (UMWELTSCHUTZ); ECOLOGICAL LIFE-CYCLE ASSESSMENT + ENVIRONMENTAL ACCOUNTING (ENVIRONMENTAL PROTECTION); info:eu-repo/classification/ddc/620; info:eu-repo/classification/ddc/333.7; Engineering & allied operations; Natural resources, energy and environment

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Hischier, R. (2013). Life cycle assessment of manufactured nanomaterials: Inventory modelling rules and application example. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/69015

Chicago Manual of Style (16th Edition):

Hischier, Roland. “Life cycle assessment of manufactured nanomaterials: Inventory modelling rules and application example.” 2013. Doctoral Dissertation, ETH Zürich. Accessed April 12, 2021. http://hdl.handle.net/20.500.11850/69015.

MLA Handbook (7th Edition):

Hischier, Roland. “Life cycle assessment of manufactured nanomaterials: Inventory modelling rules and application example.” 2013. Web. 12 Apr 2021.

Vancouver:

Hischier R. Life cycle assessment of manufactured nanomaterials: Inventory modelling rules and application example. [Internet] [Doctoral dissertation]. ETH Zürich; 2013. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/20.500.11850/69015.

Council of Science Editors:

Hischier R. Life cycle assessment of manufactured nanomaterials: Inventory modelling rules and application example. [Doctoral Dissertation]. ETH Zürich; 2013. Available from: http://hdl.handle.net/20.500.11850/69015

.