Rozprawy doktorskie na temat „Soil conservation”
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Stenberg, Maria. "Soil tillage influences on nitrogen conservation /". Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1998. http://epsilon.slu.se/avh/1998/91-576-5468-9.gif.
Pełny tekst źródłaHoshino, Mitsuo, i 光雄 星野. "Soil erosion and conservation in Western Kenya". Graduate School of Environmental Studies, Nagoya University, 2006. http://hdl.handle.net/2237/7323.
Pełny tekst źródłaHwang, Sang Won. "Sustainable use of soil resource base in the Dominican Republic : a farm level economic analysis of soil conservation practices /". This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-01122010-020205/.
Pełny tekst źródłaPiccoli, Ilaria. "CHALLENGES OF CONSERVATION AGRICULTURE ON SILTY SOILS. DISENTANGLING THE EFFECTS OF CONSERVATION PRACTICES ON SOIL ORGANIC CARBON CYCLE AND SOIL PORE NETWORK IN NORTH-EASTERN ITALY". Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424845.
Pełny tekst źródłaLa perdita di sostanza organica è una delle minacce del suolo riconosciute a livello europeo e le ripetute lavorazioni del terreno sono state connesse con alcuni effetti negativi sulle proprietà del suolo e con i relativi servizi ecosistemici. Per questo, lo studio di pratiche agronomiche più sostenibili rappresenta una sfida per l’intera comunità scientifica. Tra le tecniche agronomiche sostenibili, l’agricoltura conservativa (AC) è una pratica ampiamente diffusa che è basata su tre principi cardine: 1) minimo disturbo del suolo, 2) copertura permanente del terreo e 3) diversificazione delle colture. AC è spesso associata a numerose funzioni del suolo quali l’aumento della biodiversità, dello stock di carbonio organico e della stabilità degli aggregati e la riduzione del runoff, dell’erosione, delle lisciviazioni di P e delle emissioni di anidride carbonica. Nonostante ciò, recentemente AC non è sempre considerata come una soluzione vincente per la mitigazione del clima e per il miglioramento dell’agroecosistema in quanto l’assenza delle lavorazioni del terreno possono influenzare negativamente lo sviluppo radicale mediante un aumento della densità e della resistenza del suolo e mediante una diminuzione della porosità e degli scambi gassosi. Per di più, i benefici delle pratiche conservative sono riconosciuti essere strettamente legati al tipo di clima e suolo. In quest’ottica di risultati contrastanti, maggiori studi sono necessari per studiare e ottimizzare le potenzialità di pratiche agronomiche più sostenibili. Per questi motivi, in questa tesi, è stata condotta una prova di campo comprendente quattro aziende agricole della bassa pianura Veneta caratterizzate da suoli limosi nei quali le pratiche conservative (non lavorazione, cover-crop e ritenzione dei residui) sono state adottate e confrontate con quelle tradizionali. Il primo obiettivo di questa tesi è stato quello di valutare gli effetti di AC sul ciclo del C. In particolare è stata valutata l’evoluzione del carbonio organico del suolo (COS) sia in termini quantitativi che qualitativi durante un periodo di transizione di tre anni. Lo stock di COS è stato quantificato mediante l’applicazione della massa equivalente fino a 50 cm di profondità mentre l’effetto delle diverse componenti del trattamento conservativo è stato studiato considerando le biomasse delle colture, delle cover-crop e degli apparati radicali e il tipo di lavorazione come fattori separati. La qualità del COS è stata invece caratterizzata analizzando il carbonio umico, le sue frazioni in peso e la biomassa microbica. Questo studio ha mostrato come dopo un breve periodo di applicazione di tali pratiche, lo stock di COS nel suolo non sia aumentato mostrando piuttosto una diversa ripartizione lungo il profilo. La qualità del carbonio organico ha invece beneficiato delle pratiche conservative con la produzione di sostanze umiche più policondensate. Il secondo obiettivo ha riguardato lo studio dell’influenza di AC sugli scambi gassosi del suolo mediante l’analisi della permeabilità all’aria, della diffusione, della air-filled porosity e mediante la derivazione di indici di struttura su 144 campioni indisturbati di suolo di 100 cm3. Le analisi hanno evidenziato le scarse proprietà di trasmissione dei suoli limosi indipendentemente dalla pratica agronomica adottata che hanno portato al raggiungimento di valori critici sia per l’aerazione del terreno che per le attività microbiche aerobiche. Il terzo obiettivo si è focalizzato sulla caratterizzazione dell’evoluzione della struttura del suolo dopo cinque anni dall’adozione delle pratiche di AC. La porosità del suolo è stata analizzata sia mediante l’utilizzo di microtomografie a raggi-x che di porosimetrie a intrusione di mercurio. La porosità totale, la distribuzione dei pori (dalla macro- alla micro-scala) e l’architettura dei pori sono state quantificate su 96 campioni indisturbati raccolti nelle quattro aziende sperimentali. I risultati hanno mostrato come i suoli limosi del Veneto siano “microstrutturati” in quanto la maggior parte della porosità ricade nel range 0.0074-30 μm e come le pratiche conservative abbiano positivamente influenzato la ultramicroporosità (0.1-5 μm) che è strettamente legata alla protezione della sostanza organica. Concludendo, come evidenziato dallo scarso effetto sul sequestro del C, sugli scambi gassosi e sulla struttura del terreno, i suoli limosi della bassa pianura Veneta hanno mostrato una lenta reazione alle pratiche conservative. Lo scarso contenuto di COS non complessato disponibile all’interazione con le particelle fini del terreno ha ostacolato la formazione di una struttura stabile portando al compattamento del suolo. Nonostante ciò, le pratiche conservative hanno però positivamente influenzato la qualità del C e la ultramicroporosità suggerendo che un ciclo virtuoso tra sostanza organica e struttura del suolo è stato inizializzato. Un periodo di transizione di più lunga durata sembra essere indispensabile per il raggiungimento di un nuovo equilibrio in sistemi conservativi e più studi sui meccanismi che regolano la struttura in suoli limosi risultano inoltre necessari.
Dinel, H. (Henri) 1950. "The influence of soil organic matter components on the aggregation and structural stability of a lacustrine silty clay /". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74306.
Pełny tekst źródłaAlemu, Tekie. "Land tenure and soil conservation : evidence from Ethiopia /". Göteborg, 1999. http://www.loc.gov/catdir/toc/fy041/00309493.html.
Pełny tekst źródłaMontas, Hubert J. "A decision support system for soil conservation planning /". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59831.
Pełny tekst źródłaGoshu, Kassaye. "Biological soil conservation techniques for Maybar area, Ethiopia /". [S.l : s.n.], 1994. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Pełny tekst źródłaBarrak, Khalid Mohamed 1956. "Effects of various mulches on soil moisture conservation". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/191944.
Pełny tekst źródłaKelsey, Kurt L. "Use of the Revised Universal Soil Loss Equation (Rusle) to predict event soil loss /". Link to abstract, 2002. http://epapers.uwsp.edu/abstracts/2002/Kelsey.pdf.
Pełny tekst źródłaWigley, Georgina M. "Constraints on soil conservation in the Pindars River and Two Meetings Watersheds, Jamaica". Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64098.
Pełny tekst źródłaNewman, James Kenneth. "Soil erosion prediction for shaping conservation policy and practice". [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3403858.
Pełny tekst źródłaNyangena, Wilfred. "Essays on soil conservation, social capital and technology adoption /". Göteborg : Deptartment of Economics, School of Economics and Commercial Law [Nationalekonomiska institutionen, Handelshögskolan], Göteborg University, 2006. http://www.handels.gu.se/epc/archive/00004619/01/Nyangena%5Ffull.pdf.
Pełny tekst źródłaPradhan, Lal Chand. "DESIGN, CONSTRUCTION AND EVALUATION OF SMALL SCALE STRUCTURES FOR CONTROLLING CONCENTRATED FLOW EROSION". Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275415.
Pełny tekst źródłaKagwanja, Joan Cuka. "Determinants of farm level soil conservation technology adoption : lessons from the high rainfall, high populated, steep sloped Mt. Kenya highlands, Embu, Kenya /". free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3025628.
Pełny tekst źródłaCooper, Sophie E. "The role of conservation soil management on soil and water protection at different spatial scales". Thesis, Cranfield University, 2006. http://hdl.handle.net/1826/1775.
Pełny tekst źródłaBhattacharyya, Ranjan. "Using palm-mat geotextiles for soil conservation on arable loamy sands in the United Kingdom". Thesis, University of Wolverhampton, 2009. http://hdl.handle.net/2436/88536.
Pełny tekst źródłaMei, Xiaodong. "Soil conservation and sustainable land use in Inner Mongolia, China". Weikersheim Margraf, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2795672&prov=M&dok_var=1&dok_ext=htm.
Pełny tekst źródłaHellin, Jonathan. "Soil and water conservation in Honduras : a land husbandry approach". Thesis, Oxford Brookes University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325265.
Pełny tekst źródłaCárcamo, Julio Antonio. "Sustainable development in Honduras: economic evaluation of soil conservation practices". Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/42613.
Pełny tekst źródłaMaster of Science
Milne, Eleanor. "Soil conservation in relation to maize productivity on sub-tropical red soils in Yunnan Province, China". Thesis, University of Wolverhampton, 2001. http://hdl.handle.net/2436/93882.
Pełny tekst źródłaTizale, Chilot Yirga. "The dynamics of soil degradation and incentives for optimal management in the Central Highlands of Ethiopia". Thesis, Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-06082007-094341.
Pełny tekst źródłaMoehansyah, Haji. "Soil erosion, population pressure and conservation strategies in the Riam Kanan catchment, Indonesia /". [Richmond, N.S.W.] : Faculty of Environmental Management and Agriculture, University of Western Sydney, Hawkesbury, 1998. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030623.113640/index.html.
Pełny tekst źródłaNorris, Patricia E. "Factors influencing the adoption of soil conservation practices in Virginia's Piedmont Bright Leaf Erosion Control Area". Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104521.
Pełny tekst źródłaYau, Fung-yee Caroline. "Soil and afforestation in the Shing Mun Country Park, Hong Kong". Click to view the E-thesis via HKUTO, 1997. http://sunzi.lib.hku.hk/hkuto/record/B42128420.
Pełny tekst źródłaNegim, Osama. "New Technique for Soil Reclamation and Conservation: In Situ Stabilization of Trace Elements in Contaminated Soils". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00408020.
Pełny tekst źródłaNegim, Osama. "New technique for soil reclamation and conservation : in situ stabilisation of trace elements in contaminated soils". Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13821/document.
Pełny tekst źródłaSoil contamination by trace elements is a widespread problem in many parts of the world. The accumulation of toxic metals in soil is mainly inherited from parent materials or inputs through human activities. In fact, one of the sources of soil contaminations is very important resulting from chemical widely used wood preservative industries in aquatic environments and storing the wood after treatment by chromated copper arsenate (CCA). Elements such as As, Cu, Cr, and Zn can be found in excess in contaminated soils at wood treatment facilities, especially when Cu sulphates and chromated copper arsenate (CCA) were used as a preservative against insects and fungi, which may result in soil phytotoxicity as well as toxic to plants, animals and humans. New techniques are being developed to remediate trace elements in contaminated soils such as phytoremediation and in situ stabilization. In situ stabilization technique or in situ immobilisation is one of the common practices for reducing negative effects of metals and metalloids such as As, Cr, Cu, Pb, Cd and Zn in contaminated soils by adding amendments. Alkaline materials are usually added to acidic soils to improve soil chemical and physical properties and also to reduce the mobility and bioavailability of contaminant. Slag, which consists of calcium oxide, phosphorus oxide, silicon oxide, iron oxide, and other metal oxides, is an alkaline by-product of metallurgical processes or a residue of incineration processes. Slags have been successfully used to soil reclamation and soil fertiliser. It has been used as a soil additive to reduce various metals contaminated soil by precipitation and adsorption on the surface of metal oxide. The objectives of this Ph.D study were to evaluate the physical, chemical soil properties and the distribution of trace elements in contaminated soil. Also to evaluate the characteristics of two different slags samples, a basic slag (BS) and a basic slag phosphate (BSP) which are alkaline by-products of the French steel industry and which used as a soil amendments to improve soil properties and for the in situ immobilisation of copper and metals in chromated copper arsenate (CCA) contaminated soil
Negim, Osama Le Coustumer Philippe Mench Michel. "New technique for soil reclamation and conservation in situ stabilisation of trace elements in contaminated soils /". S. l. : S. n, 2009. http://ori-oai.u-bordeaux1.fr/pdf/2009/NEGIM_OSAMA_2009.pdf.
Pełny tekst źródłaShouse, Bennett Scott. "Implementation costs of Kentucky's erosion control best management practices for skid trails". Lexington, Ky. : [University of Kentucky Libraries], 2002. http://lib.uky.edu/ETD/ukyfore2001t00015/Shouse.pdf.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains vi, 75p : ill., maps. Includes abstract. Includes bibliographical references (p. 74).
Moehansyah, Haji. "Soil erosion, population pressure and conservation strategies in the Riam Kanan Catchment, Indonesia". Thesis, [Richmond, N.S.W.] : Faculty of Environmental Management and Agriculture, University of Western Sydney, Hawkesbury, 1998. http://handle.uws.edu.au:8081/1959.7/394.
Pełny tekst źródłaCastonguay, Stéphane. "Managing scientific change in agricultural policies : soil productivity, resource conservation and the legitimation of agrobiology /". This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09052009-040708/.
Pełny tekst źródłaNorville, Peter. "The design and evaluation of soil conservation systems in St. Lucia /". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59576.
Pełny tekst źródłaFor rainfall amounts between 14.2 and 211.2 mm, runoff depths varied from 0.6 to 203.6 mm in the control plot, 2.1 to 199.2 mm in the contour drained plot, 3.2 to 155.1 mm in the strip cropped plot and 1.3 to 94.7 mm in the terraced plot. The largest amounts of runoff were most often recorded in the strip cropped plot, while on most occasions, the terraced plot produced the least runoff.
Soil loss rates varied from 0.01 to 1.77 kg/ha in the control plot, 0.07 to 16.88 kg/ha in the contour drained plot, 0.2 to 28.86 kg/ha in the strip cropped plot and 0.01 to 6.62 kg/ha in the terraced plot.
Construction costs per hectare were EC$5565 for the contour drainage system, EC $5425 for the strip cropped system and EC$6350 for the terraced system.
Further monitoring of the conservation systems is required for prediction of their long-term effectiveness in runoff and soil erosion control.
Ahiale, Evelyn Dalali. "Economic valuation of soil and water conservation technologies in northern Ghana". Thesis, University of Reading, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578024.
Pełny tekst źródłaArevalo-Mendez, Ignacio. "Soil conservation with leguminous cover crops following deforestation of tropical steepland". Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/33228.
Pełny tekst źródłaSchuler, Johannes. "An economic analysis of the implementation options of soil conservation policies". [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:100-opus-3186.
Pełny tekst źródłaElliott, Jennifer A. "Soil erosion and conservation in Zimbabwe : political economy and the environment". Thesis, Loughborough University, 1989. https://dspace.lboro.ac.uk/2134/6945.
Pełny tekst źródłaTroyee, Anupoma Niloya. "Impact of soil treatments in the conservation of native rhizobia populations". Master's thesis, Universidade de Évora, 2017. http://hdl.handle.net/10174/22076.
Pełny tekst źródłaSmith, Jennifer Lynn. "The use of rolled erosion control products (RECPs) for minimizing soil erosion". Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available, full text:, 2007. http://wwwlib.umi.com/cr/syr/main.
Pełny tekst źródłaMoehansyah, Haji, of Western Sydney Hawkesbury University i Faculty of Environmental Management and Agriculture. "Soil erosion, population pressure and conservation strategies in the Riam Kanan Catchment, Indonesia". THESIS_FEMA_XXX_Moehansyah_H.xml, 1998. http://handle.uws.edu.au:8081/1959.7/394.
Pełny tekst źródłaDoctor of Philosophy (PhD)
Rachman, Achmad. "Influence of grass hedges on soil hydraulic properties, runoff and soil erosion in a small watershed /". free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3115583.
Pełny tekst źródłaMoopayak, Sumitra. "Local polysaccharide-producing soil cyanobacteria as potential soil conditioners in Nakhonsawan Province, Thailand". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2008. https://ro.ecu.edu.au/theses/235.
Pełny tekst źródłaDijk, Paulus Maria van. "Soil erosion and associated sediment supply to rivers seasonal dynamics, soil conservation measures and impacts of climate change /". [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2001. http://dare.uva.nl/document/60698.
Pełny tekst źródłaMulengera, Matthew Kagorobha. "Soil loss prediction in the semi-arid tropical savanna zone : a tool for soil conservation planning in Tanzania". Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318175.
Pełny tekst źródłaHwang, Sang Won. "Sustainable use of soil resource base in the Dominican Republic:a farm level economic analysis of soil conservation practices". Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/40618.
Pełny tekst źródłaResults indicate that income losses will be substantial when complying with soil loss standards without introducing soil conservation practices. Net income reduction of 36% can be expected with a reduction in soil loss by 50%. With the introduction of soil conservation practices, substantial reductions in erosion can be obtained with only a minor reduction in net income. For example, with grass strips, 50% reduction in soil loss can be expected with only a 7% reduction in income.
Analysis of the effects of changes in agricultural policies indicates that restricting
access to credit and changes in tenure from secure land holdings to lack of land titles
does not affect the incentive to conserve soil in the short run. Furthermore, analysis
of effects of changes in agricultural pricing policies indicates that the promotions of
coffee, sweet potatoes, and beans represent the least-costly means of meeting the
twin goals of erosion reduction and income maintenance.
Master of Science
Yau, Fung-yee Caroline, i 邱鳳儀. "Soil and afforestation in the Shing Mun Country Park, Hong Kong". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B42128420.
Pełny tekst źródłaZaikin, Andrey. "Economics of soil and water conservation in irrigated and dry lands agriculture". Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Summer2006/a%5Fzaikin%5F072606.pdf.
Pełny tekst źródłaTabot, Helen, Muluken Elias Adamseged i Mohammed Nasir Uddin. "Analysis of Soil Conservation Policies : A Case Study of Germany and Bangladesh". 名古屋大学大学院教育発達科学研究科 技術・職業教育学研究室, 2012. http://hdl.handle.net/2237/17033.
Pełny tekst źródłaDzuda, Lorraine Nyaradzo. "Analysis of soil and water conservation techniques in Zimbabwe, a duration analysis". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60424.pdf.
Pełny tekst źródłaKrois, Joachim [Verfasser]. "Soil and Water Conservation in the Northern Andes of Peru / Joachim Krois". Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1115722476/34.
Pełny tekst źródłaKawa, Ibrahim Hussein. "The Dodoma Region Soil Conservation Project (HADO), Tanzania : is it institutionally sustainable?" Thesis, University of East Anglia, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357243.
Pełny tekst źródła