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SPARKS, NICOLE RENEE. "PHOSPHORUS SATURATION AS RELATED TO FERTILIZATION HISTORY OF AN OHIO ALFISOL". University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029527653.
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Bajracharya, Roshan Man. "Soil Crusting and Erosion Processes on an Alfisol in South- Central India /". The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487861396027536.
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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.
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Agricultural land in China is being degraded, with soil erosion becoming an increasing problem. In Yunnan Province, south-west China, there is a long history of soil erosion due to soil type, climate, anthropogenic influence and because 95% of the Province is mountainous. Population pressure and lack of flat land necessitate cultivation of steep slopes. The Yunnan Government prohibits cultivation of slopes >25°, however policy enforcement would result in food shortages in the Province, due to a lack of suitable land <25°. Therefore, the most appropriate way to curb soil erosion in Yunnan is to devise affordable agronomic means of reducing soil loss, which do not decrease crop productivity on sloping land currently under cultivation. At present, very little research has addressed these issues. A research project, building on existing work from 1993-1996, was initiated in 1998. The aim was to test the hypothesis that contour cultivation and contour cultivation plus straw mulch decrease runoff and soil erosion rates on sloping land in Yunnan Province under maize cultivation and to assess the impact of these conservation measures on maize productivity and soil nutrient status. Thirty runoff plots, located on three different slope angles (I 3°, II 10° and III 27°), in three groups of 10, were used to examine three cropping treatments in a replicated plot design in 1998 and 1999. Treatments were downslope cultivation (control), contour cultivation and contour cultivation plus straw mulch. In addition, there was an unreplicated bare plot in each group. Runoff and soil loss were measured on a storm-by-storm basis. Soil nutrient status was measured at the beginning and end of each cropping season. Crop growth parameters and soil physical properties were measured throughout the cropping seasons (21/05–7/10 in 1998 and 22/05–2/10 in 1999). In 1998, seasonal rainfall was 1024 mm, ~28% greater than the 30-year mean. Soil loss was significantly reduced by contour cultivation on Slopes I and II. On Slope I, downslope cultivation produced 3.07 t ha-1 soil loss and contour cultivation reduced this by 81.4 %. On Slope II, downslope cultivation produced 19.11 t ha-1 and contour cultivation reduced this by 58.0%. The addition of straw mulch gave a further, nonsignificant, reduction on both slopes. On Slope III, downslope cultivation and contour cultivation produced 6.92 and 6.29 t ha-1 of soil loss, respectively, with contour cultivation plus straw mulch having 99.4% less erosion than downslope cultivation. In the much drier 1999 season, no treatment significantly reduced soil loss on Slope I. Contour cultivation significantly reduced soil loss on Slopes II and III. On Slope II, downslope and contour cultivation produced 11.52 t ha-1 of soil loss and contour cultivation reduced this by 85.8%. On Slope III, downslope and contour cultivation produced 8.62 and 0.23 t ha-1, respectively; a reduction of 97.3% by contour cultivation. The addition of straw mulch did not further decrease soil loss. Treatment effects on soil nutrient status varied between the two years. At the end of the 1998 season, there was significantly higher soil available N under contour cultivation plus straw mulch on all three slopes (Slopes I and II P <0.001, Slope III P <0.05), an effect that was not found in 1999. At the end of the 1999 season, soil available K was significantly (P <0.001) higher under contour cultivation plus straw mulch on Slope III. In both years, contour cultivation plus straw mulch significantly reduced soil temperature. However, this did not result in yield reductions in comparison with the control. There was an increase in soil moisture content under contour cultivation plus straw mulch during dry periods, which was particularly noticeable in 1999. In 1998, there were no significant treatment effects on grain or shoot yield. In 1999, on Slope II, contour cultivation plus straw mulch significantly increased grain yield by 50.3% compared with the downslope treatment (P <0.05). In 1999, contour cultivation plus straw mulch also significantly increased leaf plus stem yield on Slopes I and II by 12.4 and 36.8%, respectively. It is concluded that on ≤10° slopes, contour cultivation alone is a suitable soil conservation measure. However, use of straw mulch would benefit soil moisture and nutrient status and could, therefore, increase crop yield. On ≥27° slopes, it is recommended that contour cultivation plus straw mulch be used as a soil conservation measure to ensure maximum soil conservation, even in extreme rainfall conditions.
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Ann, Varughese Merrie. "Mulching and tillage effects on GHG emissions and properties of an Alfisol in Central Ohio". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322596901.
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Xu, Zhihong, i n/a. "Nitrogen Cycling in Leucaena Alley Cropping". Griffith University. Division of Australian Environmental Studies, 1991. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050906.155955.
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Field experiments were conducted on an Alfisol in the semi-arid tropics of northern Australia to investigate nitrogen (N) cycling in the leucaena (Leucaena leucocephala) alley cropping system. This is a farming system in which maize (Zea mays L.) is grown in alleys formed by leucaena hedgerows spaced 4.5 metres apart. Mineralization of N from Ieucaena (prunings) and maize residues was studied under field conditions. Response of maize growth to addition of N fertilizer and plant residues was evaluated both in field plot and microplot experiments. The fate of fertilizer N and leucaena N was examined over four consecutive seasons. The decomposition (loss of mass) of dry, cut 15N-labelled leucaena residues differed from that of intact fresh leucaena prunings in the first cropping season although no difference was detected after one year. At the end of one cropping season, 3 months after application, 58-72% of 15N-labelled leucaena had decomposed compared to only 34-36% of fresh leucaena prunings. Similar trends occurred at 20 and 52 days after application. The extent of decomposition of fresh leucaena prunings (28-33%) was similar at two loading rates (2.4 and 4.7 t DM ha -1) by 3 months after addition. About 72% of young 15N labelled maize residues was decomposed by 3 months after addition in the presence of fresh leucaena prunings. Decomposition of 15N-labelled leucaena residues and unlabelled fresh prunings was 91% and 88% respectively 14 months after addition. After 2 years the corresponding values were 96% and 94%. When N content of the recovered residues was taken into account, the values were 95% and 94% after 14 months, and the same (97%) after 2 years. Maize yield and N uptake were significantly increased following addition of either unlabelled fresh leucaena residues or 15N-labelled thy Ieucaena residues. Application of N ferilizer produced a thither increase in the presence of the residues. The maize yield and N uptake with the 15N-labelled leucaena were not different from those with the unlabelled residues. There was a significant positive interaction between N fertilizer and leucaena prunings which increased maize production. Addition of maize residues decreased the yield and N uptake of maize compared with that obtained in the presence of N fertilizer at 40 kg N ha~1 and leucaena residues (2.4 t DM ha-1). There was a marked residual benefit of N fertilizer applied in the first season at 36 kgN hat in the presence of leucaena prunings on the second maize crop yield and N uptake, but not on the third crop. However, a significant residual benefit of leucaena prunings added in the first season was found in DM yield and N uptake of the second and third maize crop. The short-term fate of 15N applied in plant residues was examined during two separate cropping seasons. By 20 days after application of separate 15N-labelled leucaena leaves, stems and petioles, 3-9% of the added 15N could be found in maize plants, 33-49% was in surface residues, 36-48% in the 2 m soil proffle and 0.3-22% unaccounted for. In a separate experiment when leucaena components were not separated, 5% of 15N applied in leucaena residues was taken up by maize 52 days after addition, 45% was in residues, 25% was in soil and 25% was unaccounted for. Jn another experiment, maize recovered 6% of added leucaena 15N after 2 months, 39% remained in residues, 28% was in soil and 27% was not recovered. Incorporation of 15N-labelled leucaena residues in the soil did not increase recoveiy of leucaena 15N by maize compared with placement of the residues on the soil surface. By the end of one cropping season (3 months after application), 9% of added 15N was recovered by maize from 15N-labelled leucaena. There was a similar 15N recoveiy from 15N-labelled maize residues applied as mulch at 1.7 t DM ha1 together with unlabelled leucaena prunings at 2.4 t DM ha ~. In both cases, 30-32% of added 15N was detected in soil, 28% in residues, and 31-34% apparently lost. The short-term fate of fertilizer 15N was different from that of 15N added in plant residues. In a 52-day experiment, maize recovered 65-79% of fertilizer 15N applied at low rates (6.1 and 12.2 kg N ha -1) in the presence of leucaena prunings, 21-34% was present in soil, and less than 1% was not recovered. By 2 months after application, recoveiy of fertilizer 15N by maize was 41% from N fertilizer added at 80 kg N ha -1, 35% from N fertilizer at 40 kg N ha -1 in the presence of leucaena prunings, and 24% from N fertilizer at 40 kg N ha -1 in the presence of maize residues and leucaena prunings. The corresponding deficits (unaccounted-for 15N) were 37%, 38% and 47% respectively. A small but significant amount of the fertilizer 15N was present in the unlabelled leucaena residues (3%) and in the mixture of unlabelled leucaena and maize residues (7%) present on the soil surface. However, application of the plant residues did not affect recoveiy of the fertilizer 15N in soil (21-24%). When N fertilizer was applied at 40 kg N hi1 in the presence of leucaena prunings, 43% of fertilizer 15N was recovered by maize at the end of cropping season, 20% in soil, 2% in residues, and 35% unaccounted for. The long-term fate of fertilizer 15N was compared with that of leucaena 15N in an experiment over four cropping seasons. In the first season, maize tops recovered 50% of the fertilizer 15N but only 4% of the leucaena 15N. In the second, third and fourth seasons, maize (tops + roots) recovered 0.7%, 0.4% and 0.3% of the initial fertilizer 15N compared with 2.6%, 1.8% and 1.4% of the initial leucaena 15N. In the second, third and fourth seasons, recovery of the initial fertilizer 15N (12-14%) in soil was much lower than that of the initial leucaena 15N (38-40%). There was no further loss of the fertilizer 15N after the first season. However, the cumulative 15N deficit for the leucaena 1N in the first two seasons was 50%--thissuggested an additional loss of 23% since the end of the first season. There was no further loss of 15N from either residual fertilizer 15N or residual leucaena 15N in the third and fourth seasons. In conclusion, application of leucaena prunings could substantially increase maize yield and N uptake although some supplementary N fertilizer may be required to achieve maximum crop yield. Maize recovered only a small amount of added leucaena N in the first year. Most of the leucaena residue N was present in the soil and remaining residues after one season. This residue N would be gradually available for plant uptake by subsequent crops. Of course, annual additions of leucaena prunings would appreciably increase the pool of available N over time. Thus, application of leucaena prunings could substantially improve soil fertility in the long term.
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Cazetta, Disnei Amélio [UNESP]. "Épocas de aplicação do nitrogênio nas características agronômicas e na eficiência de uso na cultura do milho". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105133.
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cazetta_da_dr_jabo.pdf: 537560 bytes, checksum: 1d9d7ab4cc189b5b27c53c296f415bad (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O N é o nutriente exigido em maior quantidade pela cultura do milho, influenciando nas características fenológicas, produtivas e na qualidade de grãos. Para avaliar a influência de épocas de aplicação do N sobre as características agronômicas e de eficiência de uso do nutriente na cultura do milho, o presente trabalho foi desenvolvido nos anos agrícolas 2006/2007 e 2007/2008, em dois ambientes de produção (Jaboticabal – em solo do tipo Latossolo e Itápolis – em solo do tipo Argissolo) no sistema de plantio direto em consolidação, utilizando o delineamento experimental em blocos ao acaso, constituídos por vinte e dois tratamentos, com quatro repetições. Cada parcela foi representada por oito linhas com 6,0 m de comprimento, considerando-se como área útil as quatro linhas centrais, desprezando-se um metro em ambas as extremidades. Concluiu-se que as características agronômicas, nutricionais e de eficiência de uso do N são influenciadas pelas épocas de aplicação de N e pelo ambiente, porém a aplicação de 120 kg ha-1 nos estádios de V4-V5 é superior em relação as demais, proporcionando também maior eficiência agronômica de uso do N; em ambiente de produção de Itápolis, as maiores produtividades são decorrência da aplicação parcelada de N na semeadura, no estádio V4-V5 e V10-V12 (30-60-30), ou pela aplicação total de N no estádio V4-V5; em ambiente de produção de Jaboticabal, as maiores produtividades são promovidas pelo parcelamento do N, como também pela aplicação total do N na semeadura e no estádio V4-V5; a estimativa do teor de clorofila para diferenciar tratamentos de adubação nitrogenada deve ser feita no estádio V10-V11 do milho; o estudo de correlação é viável para o estudo da adubação nitrogenada no milho e serve como uma ferramenta para as demais observações
Nitrogen is the nutrient required in greatest quantity by the maize crop, influencing the phenological, yield and grain quality. To assess the influence of timing of N application on agronomic characteristics and use efficiency of nutrient use in maize, this work was developed in the years of 2006/2007 and 2007/2008, in two production environments (Jaboticabal - Oxisol soil type and Itápolis – Alfisol soil type) in no-tillage system in consolidation, using a randomized block design, consisting of twenty-two treatments with four replications. Each plot was represented by eight lines, with 6,0 m long, considering how useful the area four central lines, ignoring one meters at both ends. We conclude that the agronomic characteristics, nutritional and use efficiency of N are influenced by timing of N application and the environment, but the application of 120 kg ha-1 in stages V4-V5 is higher than in the other, also provide the highest agronomic use efficiency of N; in production environment Itápolis, the highest yields are due to split N application at sowing, at the stage V4-V5 and V10-V12 (30-60-30), or the total application of N at V4-V5 stage; in production environment Jaboticabal, the highest yields are promoted by splitting N, as well as the application of total N at sowing and at stage V4-V5, the estimation of chlorophyll content to differentiate fertilization treatments should be done in the V10-V11 stage of maize, the correlation study is feasible for the study of nitrogen fertilization in maize and serves as a tool for other observations
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Lacarce, Eva. "Evolution structurale, minéralogique et géochimique d'une séquence Vertisol - Alfisol : étude dans la zone de transition climatique du sud de l'Inde sur socle Archéen". Paris 6, 2006. http://www.theses.fr/2006PA066283.
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Dans la zone de transition climatique du sud de l'Inde, des Vertisols noirs et des Alfisols rouges sont associés au sein de petits bassins versants. Quels sont les déterminismes et les mécanismes à l'origine de leur différenciation ? La roche, ici un complexe métamorphique, mais aussi l'eau par les transports de particules ou de solutés et l'ambiance chimique qu'elle induit, peuvent être des facteurs clef. Pour répondre à cette question, une étude multi-scalaire des structures et des constituants du sol, depuis le bassin versant jusqu'au minéral, a été menée sur le bassin versant de Mule Hole. La chimie et la minéralogie des constituants ont été déterminées, finement pour les argiles et les oxydes de fer qui sont respectivement les principaux responsables de la formation d'horizons vertiques et de la couleur des sols. Dans l'altérite, une roche felsique produit des kaolinites et une roche mafique produit des smectites. Ces 2 roches ont contribué à la formation des horizons pédologiques. Néanmoins une forte influence felsique engendre plus de sables de quartz et moins d'argile et gène la formation d'horizons vertiques. Par contre dans les horizons superficiels et vertiques, les smectites subissent une transformation en kaolinite via un interstratifié K/S du fait d'une acidification du sol et de l'épuisement de l'alcalinité que constituent les minéraux primaires altérables. A terme ce processus pourrait aussi induire la transformation des Vertisols. Parallèlement, du fer est libéré des silicates et produit de l'hématite rouge à l'amont qui est drainé et des hydroxydes et des formes amorphes à l'aval
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Cazetta, Disnei Amélio. "Épocas de aplicação do nitrogênio nas características agronômicas e na eficiência de uso na cultura do milho /". Jaboticabal : [s.n.], 2010. http://hdl.handle.net/11449/105133.
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Orientador: Domingos Fornasieri FilhoBanca: Aildson Pereira Duarte
Banca: Orivaldo Arf
Banca: José Carlos Barbosa
Banca: Leandro Borges Lemos.
Resumo: O N é o nutriente exigido em maior quantidade pela cultura do milho, influenciando nas características fenológicas, produtivas e na qualidade de grãos. Para avaliar a influência de épocas de aplicação do N sobre as características agronômicas e de eficiência de uso do nutriente na cultura do milho, o presente trabalho foi desenvolvido nos anos agrícolas 2006/2007 e 2007/2008, em dois ambientes de produção (Jaboticabal - em solo do tipo Latossolo e Itápolis - em solo do tipo Argissolo) no sistema de plantio direto em consolidação, utilizando o delineamento experimental em blocos ao acaso, constituídos por vinte e dois tratamentos, com quatro repetições. Cada parcela foi representada por oito linhas com 6,0 m de comprimento, considerando-se como área útil as quatro linhas centrais, desprezando-se um metro em ambas as extremidades. Concluiu-se que as características agronômicas, nutricionais e de eficiência de uso do N são influenciadas pelas épocas de aplicação de N e pelo ambiente, porém a aplicação de 120 kg ha-1 nos estádios de V4-V5 é superior em relação as demais, proporcionando também maior eficiência agronômica de uso do N; em ambiente de produção de Itápolis, as maiores produtividades são decorrência da aplicação parcelada de N na semeadura, no estádio V4-V5 e V10-V12 (30-60-30), ou pela aplicação total de N no estádio V4-V5; em ambiente de produção de Jaboticabal, as maiores produtividades são promovidas pelo parcelamento do N, como também pela aplicação total do N na semeadura e no estádio V4-V5; a estimativa do teor de clorofila para diferenciar tratamentos de adubação nitrogenada deve ser feita no estádio V10-V11 do milho; o estudo de correlação é viável para o estudo da adubação nitrogenada no milho e serve como uma ferramenta para as demais observações
Abstract: Nitrogen is the nutrient required in greatest quantity by the maize crop, influencing the phenological, yield and grain quality. To assess the influence of timing of N application on agronomic characteristics and use efficiency of nutrient use in maize, this work was developed in the years of 2006/2007 and 2007/2008, in two production environments (Jaboticabal - Oxisol soil type and Itápolis - Alfisol soil type) in no-tillage system in consolidation, using a randomized block design, consisting of twenty-two treatments with four replications. Each plot was represented by eight lines, with 6,0 m long, considering how useful the area four central lines, ignoring one meters at both ends. We conclude that the agronomic characteristics, nutritional and use efficiency of N are influenced by timing of N application and the environment, but the application of 120 kg ha-1 in stages V4-V5 is higher than in the other, also provide the highest agronomic use efficiency of N; in production environment Itápolis, the highest yields are due to split N application at sowing, at the stage V4-V5 and V10-V12 (30-60-30), or the total application of N at V4-V5 stage; in production environment Jaboticabal, the highest yields are promoted by splitting N, as well as the application of total N at sowing and at stage V4-V5, the estimation of chlorophyll content to differentiate fertilization treatments should be done in the V10-V11 stage of maize, the correlation study is feasible for the study of nitrogen fertilization in maize and serves as a tool for other observations
Doutor
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Reydellet, Itto. "Effet de la rhizosphère du maïs sur la minéralisation brute de l'azote dans un sol ferrugineux tropical (Burkina Faso)". Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL083N.
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L’objectif de ce travail est d'évaluer l'importance de l'effet rhizosphérique sur la minéralisation de l'azote et d'en déterminer les mécanismes en zone de savane ouest-africaine. L’utilisation de la technique isotopique (15N) et d'un modèle de la dynamique de l'azote permet d'évaluer les flux bruts de minéralisation et d'organisation. Cette technique a été utilisée in situ, sur un sol de la région de Bobo Dioulasso, au Burkina Faso. Les mesures concernent un sol nu et un sol cultivé en maïs. Les résultats des flux d'azote dans le sol suggèrent que le turn-over minéralisation-organisation est très important. Les flux présentent une grande variabilité spatiale et temporelle, qui dépasse les différences entre les traitements. Il est cependant souligné que les méthodes isotopiques classiques de mesures des flux bruts, qui ne tiennent pas compte de l'hétérogénéité induite par les racines, appliquées en sol cultivé peuvent conduire à sous estimer l'augmentation de minéralisation brute due à l'effet rhizosphérique. Une approche du point de vue de la plante est proposée pour l'évaluation de la part de la minéralisation rhizosphérique dans le prélèvement azoté du maïs. Les résultats suggèrent que, dans le cas ou les teneurs en nitrate dans le sol sont très faibles, 35% de l'azote absorbé provient de la minéralisation rhizosphérique. Une méthode d'évaluation des flux bruts de la dynamique de l'azote dans l'environnement des racines a été mise au point. Elle est basée sur un dispositif qui autorise l'échantillonnage du sol à différentes distances de la racine et sur un modèle de simulation de la dynamique des flux d'azote dans l'environnement des racines. La minéralisation brute en présence de racines actives est au moins deux fois plus important que celle du sol hors de l'effet des racines. Ce résultat confirme l'hypothèse d'un effet rhizosphérique stimulant la minéralisation brute de l'azote.
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Wink, Charlote. "ESTOQUE DE CARBONO EM PLANTAÇÕES DE EUCALYPTUS sp. IMPLANTADOS EM CAMPO NATIVO". Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/8650.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThe soil management with emphasis in keeping soil residues on surface combined with vegetation growth may reduce carbon (C) emission to the atmosphere. The objective of this study is to measure the effects of the Eucaliptus Forest 20, 44 and 240 months old and native grassland on carbon sequestration in Paleudult, in Santa Maria, RS. The forest production was determined by Smalian method measuring selected trees, chosen from forest inventory based on standard deviation of breast height. The carbon of trees biomass was measured by weighting dry matter of leaves, branches, wood and cork and after converting to C by multiplying by 0.45. The C content in the forest litter, grassland, soil particulate and mineral associated organic matter in six soil layers were determined by CHNS auto analyzer. Soil physical properties as total, macro and microporosity, particle density and size distribution were determined and related to Eucaliptus and grassland. Soil samples were also used to measure some soil chemical properties. The dataset were tested to detect if there were normal distribution and variance homogeneity. To normal or transformed data, analysis of Variance and Tukey test (5%) for variables with significant F was applied. The greatest C stocks were in the wood and cork in all forest ages, however, the proportinal C in leaves and branches decreased with Eucalyptus age.The C stock in forest production added to grassland and litter dry matter increased with substitution of grassland by Eucalyptus Forest, and the difference increased with the age of trees. The content and stock of soil C are low and did not increase with introduction of forest on grassland soil. The soil layers with higher clay content had less C as compared to surface layers with lower clay content and higher C. The particulate organic matter varied the most with forest age and grassland indicating higher sensibility than organic matter associated with soil minerals. The introduction of forest on grassland did not change soil physical properties suggesting that more detailed studies should be done in order to better measure the impact of trees plantation.
O cultivo planejado e consciente do solo com a manutenção do resíduo em superfície e o crescimento equilibrado da vegetação pode amenizar a emissão de carbono (C) para a atmosfera. O objetivo do estudo é conhecer o efeito das florestas de eucalipto aos 20, 44 e 240 meses de idade e do campo nativo no estoque de C em Argissolo Vermelho Distrófico úmbrico, em Santa Maria, Rio Grande do Sul. A produção florestal foi determinada pela cubagem rigorosa por meio do método de Smalian de árvores-amostras selecionadas a partir do cálculo do desvio padrão do diâmetro à altura do peito, obtido por inventário florestal. A estimativa do C na biomassa arbórea foi determinada por pesagem da massa seca dos componentes folhas, galhos, madeira e casca das árvores-amostra, transformados em C considerando um fator de 0,45, conforme Wang et al. (2001). O C presente na serapilheira das florestas, na vegetação do campo nativo, no solo, em seis camadas distribuída em profundidade e nas frações da matéria orgânica particulada e associada a minerais foi determinado por meio de autoanalisador CHNS. As demais propriedades físicas do solo como a porosidade total, macro e microporosidade, densidade de partícula, foram também relacionadas ao efeito das florestas de eucalipto. A caracterização química do solo também foi realizada. Posteriormente à análise de distribuição normal dos dados bem como da homogeneidade de variância, cada variável foi submetida à análise de variância e comparação de médias pelo teste de Tukey, a 5% de probabilidade. Os maiores estoques de carbono estão no componente madeira e na casca independente da idade das florestas, tendendo à diminuição do percentual para os componentes galhos e folhas. A produção do material arbóreo florestal agregado ao material em decomposição, bem como o seu estoque de carbono, aumentam sobremaneira quando da substituição da vegetação nativa de campo para as florestas de eucalipto, adquirindo expressividade no decorrer do crescimento e desenvolvimento das florestas. O teor e estoque de carbono no solo são baixos, indicando que o crescimento das florestas de eucalipto em substituição à vegetação nativa de campo não agregou um aumento significativo, ao contrário das constatações no componente vegetal. As camadas com maior percentual de argila não refletem diferença na presença de C comparado às camadas mais arenosas, ou superficiais, com maior presença de material orgânico. A fração matéria orgânica particulada foi a mais sensível às variações de idade de povoamento e uso da área, e menor variação na fração associada aos minerais do solo devido a suas características de proteção. Para as propriedades físicas do solo, não se observaram variações significativas quando da substituição do campo nativo pelas florestas de eucalipto. Portanto, as proposições para estudos desta magnitude objetivando o mercado de carbono e das florestas como mecanismos de desenvolvimento limpo deverão ser fidedignamente avaliadas e monitoradas durante o crescimento das florestas.
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Pallud, Céline. "Étude multi-échelles du fonctionnement hydrodynamique et microbiologique d'un sol soumis à un apport de solutés : application à l'ammonium et au 2,4-D". Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10178.
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La comprehension des mecanismes impliques dans le devenir des polluants dans le sol est necessaire pour prevoir les risques et elaborer des strategies de bioremediation. Elle implique une etude pluridisciplinaire comprenant hydrologie, microbiologie, physico-chimie. Le travail cible le transport hydrodispersif, les interactions physico-chimiques et la transformation/degradation de nh 4 + et du 2,4-d ainsi que la distribution spatiale des bacteries dans un sol brun lessive sous culture. L'approche choisie est une etude a differentes echelles en dynamique sur des colonnes de sol permettant un controle des conditions initiales et aux limites et le decouplage des phenomenes. Les resultats experimentaux de 2 traceurs de l'ecoulement (br et 1 8o) confrontes a des courbes simulees ont permis de mettre en evidence une forte exclusion anionique. Le fonctionnement hydrodispersif est tres reproductible entre colonnes et la variabilite spatiale de la teneur en eau et de la porosite est faible. Les interactions entre le 2,4-d et le sol sont faibles. Apres apport d'nh 4 +, le fonctionnement microbien se stabilise rapidement, au contraire du 2,4-d. Une forte heterogeneite inter-colonnes du fonctionnement biologique est observee et s'explique par la variabilite spatiale a l'echelle plus fine (cm 3). Les 2 groupes bacteriens semblent occuper les compartiments ou leur substrat respectif se localise majoritairement : les bacteries degradant le 2,4-d et le groupe de nitrosomonas sont preferentiellement dans l'externe a l'inverse du groupe de nitrobacter dans l'interne. Une methode novatrice d'analyse/modelisation de la distribution des bacteries a l'echelle sub-millimetrique montre que les micro-habitats sont groupes et, suite a l'apport de 2,4-d, l'augmentation de la population degradante s'accompagne d'un envahissement spatial permettant probablement une meilleure interception du substrat. Ce comportement spatial a permis dans certains cas d'expliquer une meilleure degradation du substrat.
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Guibert, Hervé. "Évolution de la matière organique et de la capacité d'échange cationique des alfisols tropicaux cultivés". Vandoeuvre-les-Nancy, INPL, 1999. http://www.theses.fr/1999INPL086N.
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La pression foncière et l'abandon progressif des jachères caractérisent l'évolution de la plupart des systèmes de culture pratiques dans la zone soudanienne. C’est le cas du bassin cotonnier du Tchad ou des baisses de productions agricoles touchent des zones densément peuplées. L’étude se fonde sur un diagnostic agronomique, des essais longue durée in situ et des analyses de laboratoire avec notamment des fractionnements de la matière organique (MO) du sol. Le diagnostic montre que la teneur en c de l'horizon de surface est un indicateur de productivité du sol au même titre que les taux d'argile, pH, CEC et teneurs en bases échangeables. Le rendement du cotonnier chute à partir de valeurs de teneur en c de 3,4 g kg 1 et de CEC de 2,5 CMOc kg-1. La minéralisation de la MO du sol apparait comme le processus d'évolution majeur affectant la productivité des sols. L’acidification des sols et la lixiviation des bases échangeables surviennent parallèlement, sans affecter aussi fortement la capacité du sol à produire. Des mesures réalisées sur des essais au tchad et en cote d'ivoire comparant des parcelles cultivées avec et sans apports de mo montrent que les variations du taux de mo de l'horizon cultural sont du même ordre de grandeur que les variations spatiales observées dans le diagnostic. Seuls des apports conséquents de fumier maintiennent ce taux juste au dessus du seuil de 3,4 g kg 1. Les enfouissements de MO fraiches ont une efficacité moindre que celle du fumier. Le fractionnement granulométrique de la MO du sol montre que les apports de fumier ou compost permettent d'augmenter les fractions de mo de toute taille, même les fractions de la taille des argiles. La fraction organo-minérale du sol de la taille des argiles participe pour 80% à la CEC des sols, grâce notamment a une CEC d'origine organique par unité de c quatre fois supérieure a celle des fractions de taille supérieures (1000 vs 270 CMOc kg-1. De c). L’application du modèle de Hénin-Dupuis aux fractions confirme que les fractions de la taille des argiles sont plus stables (demi-vie de 17 ans) que celle de la taille des limons (demi-vie de 10 ans) et des sables (demi-vie de 2 ans). Malgré cette relative stabilité, cette fraction de matière organique peut diminuer fortement si aucune gestion organique correcte n'est réalisée sur les parcelles cultivées.
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Faivre, Pierre. "Lessivage et planosolisation dans les séquences de sols caractéristiques des milieux intrandins de Colombie (Amérique du sud)". Nancy 1, 1988. http://www.theses.fr/1988NAN1A002.
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Étude des couvertures pédologiques complexes des versants des dépressions andines qui sont organisées en climatoséquences et développées à partir de pyroclastiques. On retrouve des andosols, des ferrisols (sombritropepts, sombrihumults), brunizem (argiudolls, arguistolls) et des planosols (haplustalfs, naturstafs). Tout le long du profil le cortège argileux est constitué d'halloysite. Les facteurs intensifiant le lessivage vers l'aval sont étudiés. Dans les couvertures anciennes des caractères polygénétiques sont décelables dans certains profils de planosols. Une étude des isotopes stables du carbone permet d'établir le sens des variations paléoécologiques et paléoclimatologiques
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Christopoulos, George. "Late Holocene river behaviour of the lower Alfios Basin, Western Peloponnese Greece". Thesis, University of Leeds, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251555.
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BARROS, Gerson Moreira. "Caracterização de solos ao longo de uma litossequência no oeste do Pará, Amazônia Oriental". Universidade Federal Rural de Pernambuco, 2013. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5128.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The Amazon soils are characterized by degree large of the pedogenetic evolution, reflection weathering of the large about the parent material, for this represent a key factor in soils formation. The aim of this research was to characterize the genesis, chemistry, mineralogicall, profile five of the soils and of the lithosequence along Cuiaba-Santarem highway – (BR 163) in West Para, State). The lithosequense, comprise the profile five of soils formed starting for weathered for five parental materials (Granite, Andesite, Shale, Diabase, Sediments of the Alter do Chão Formation). The profiles were described morphologically and classified according to Brazilian Soil Classification System. The profile were the following: profile 1- Yellow Ultisol distrophic, developed starting of Granite; profile 2 - Yellow Oxisol distroferric, developed starting of Andesite; profile 3 - Yellow Oxisol distrophic, developed starting of Shale; profile 4 - Red Alfisol distroferric, developed starting of Diabase; and profile 5 -Yellow Oxisol distrocohesiv, developed starting of sediments Alter do Chão Formation. It was observed large level of the clay in all profiles, mainly, in the profile 5 that account for more than 90%. In function of the material parental It was observed cohesive character occurrence in profile 5. Furthermore, the profile 2 and 4 presented large contents of the Fe. It was observed in all profiles, a mineralogical composition for clay fraction uniform kaolinite with predominance. The micronutrients Zn, Mn, Cu, Ni and Fe, showed tendency of decreasing with depth, except the iron for the profile 4. The P-rem values are large surface horizon, with tendency of decreasing with depth. It was observed in profiles, a mineralogical composition simple, with less reserve the nutrients in reflection the terms degree weathering of the large country chemistry
Os solos da Amazônia são caracterizados pelo elevado grau de evolução pedogenética, reflexo do intenso intemperismo químico sobre o material de origem, pois este representa um fator chave na formação dos solos. Objetivou-se no presente estudo caracterizar física, química e mineralogicamente 5 perfis de solos em uma litossequência ao longo da Rodovia Cuiabá-Santarém (BR 163) no oeste do estado do Pará. A litossequência, compreende cinco perfis de solos formados a partir da alteração de 5 distintos materiais de origem (Granito, Andesito, Folhelho, Diabásio e sedimentos inconsolidados da Formação Alter-do-Chão). Os perfis foram descritos morfologicamente e classificados de acordo Sistema Brasileiro de Classificação de Solos. Os perfis foram os seguintes: Perfil 1 - Argissolo Amarelo Distrófico típico, desenvolvido a partir de Granito; Perfil 2 - Latossolo Amarelo Distroférrico típico, desenvolvido a partir de Andesito; Perfil 3 - Latossolo Amarelo Distrófico típico, desenvolvido a partir de Folhelho; Perfil 4 - Nitossolo Vermelho Distroférrico típico, desenvolvido a partir de Diabásio; e o Perfil 5 - Latossolo Amarelo Distrocoeso, desenvolvido a partir de Sedimentos da Formação Alter-do-Chão. Em todos os perfis foram observados teores muito elevados de argila, em especial o perfil 5, com valores acima de 90%. Em função da natureza do material de origem, foi constatado a ocorrência do caráter coeso no perfil 5. Os perfis 2 e 4 apresentaram os maiores valores de Fe. Observou-se em todos os perfis estudados uma composição mineralógica da fração argila relativamente uniforme com predomínio de caulinita. Os micronutrientes Zn, Mn, Cu, Ni e Fe mostraram tendência de decréscimo em profundidade, excetuando-se o Fe para o perfil 4. Os valores de P-rem mostraram-se elevados nos horizontes superficiais, mas com tendência de redução em profundidade. Portanto, os solos estudados apresentam uma composição mineralógica simples e com baixa reserva de nutrientes em reflexo às condições de alto grau de intemperismo químico regional.
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Yori, Fernández Alfio [Verfasser], i Michael [Akademischer Betreuer] Möser. "Sound Absorption of Periodical Surfaces / Alfio Yori Fernández. Betreuer: Michael Möser". Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2013. http://d-nb.info/1031075240/34.
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Novak, Jeffrey M. "Characterization of humic and fulvic acids extracted from surface horizons of contiguous Alfisols and Mollisols of southwestern Ohio and their influence on mineral weathering /". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487598748020457.
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Lunardi, Neto Antônio. "Gênese de horizontes subsuperficiais escurecidos em Argis-solos de Santa Catarina e em Luvissolo da Campanha Gaúcha". Universidade do Estado de Santa Catarina, 2012. http://tede.udesc.br/handle/handle/588.
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Previous issue date: 2012-02-24In the south of Brazil, there are soils presenting darker subsurface horizons than those overly-ing ones, being more representative in Ultisols. Those ones are placed in well-drained areas and do not present sodium saturation. In dark subsurface horizon, these soils shows morpho-logical aspects similar to sombric horizons, initially related to Central Africa. This fact arise the possibility of these soils meet the sombric horizon, as related in Africa. The definition of sombric horizon showed in Soil Taxonomy has been the same for fifty years, without any important modification. In this definition the sombric horizon consists of iluvial humus not associated with aluminum or sodium. In WRB, its definition is almost the same of Soil Tax-onomy. This fact is due to the little research about the genesis of these horizons. In this re-search we analysed the profiles of three Ultisols of the State of Santa Catarina: 1.Typic Som-brihumults (PVa), in Içara, with the source material siltstones intercalated with sandstones; 2.Typic Sombrihumults (PAd), in Rancho Queimado, with the source material granites and granulites; 3. Typic Sombrihumults (PBACal), in Alfredo Wagner, with the source material argillites and siltites. It was also analyzed a profile of Alfisol (TCp) from Bagé, Rio Grande do Sul State, having as source material granites and gneisses. It was added to the study a Dy-strudepts (CH) from Bom Jardim da Serra, Mountainous Area of Santa Catarina, having as source material the basalt. This last soil does not present dark subsuperficial horizon, having been chosen in order to compare results from delta ¹³C analyses with the other soils, since it has grass vegetation for millennia. We carried out physical, chemical, mineralogical and mi-cromorphological analysis. Fractionation studies of the sand and mineralogy by X-ray diffrac-tion aimed to identify lithologic discontinuities. Micromorphological analysis aimed to identi-fy whether there was migration and accumulation of humic compounds in the dark subsurface horizons. Iron and aluminum selective dissolution aimed to identify whether there were pod-zolization processes. Studies of carbon isotopes were intended to examine whether climate change was involved in the genesis of the dark subsurface horizons. Studies were not con-cluded to TCp. For PAd and PBACal, results indicated buried soils. For PVa, results sug-gested the migration of clay-humic compounds. In Ultisols there was aluminum accumulation in the dark subsurface horizon. Results of carbon isotopes have not identified to be the organ-ic matter from different vegetation of the current. Soils did not attend the requests of classifi-cation from WRB and Soil Taxonomy to fit as sombric horizons. It is proposed to Soil Tax-onomy and FAO the requirement elimination of the humus-illuvial no-associated to aluminum occurrence as a criterion to fit those soils as sombric horizons. It is suggested its substitution by the evidence of humus-illuvial occurrence in sombric through thin slide analysis and through the evidence of lithology discontinuity absence along the toposequence and absence of agric horizon and isotopes of carbon results related to the same vegetation in surface and dark subsurface horizons. In addition, it is still proposed to Brazilian System of Soil Classifi-cation the inclusion of the sombric character, to be taken into consideration in Sub-Group level
Na região Sul do Brasil ocorrem solos que apresentam horizontes subsuperficiais mais escu-recidos que os horizontes sobrejacentes, notadamente na classe dos Argissolos. Estes solos estão situados em locais bem drenados e não apresentam saturação por sódio. Os horizontes subsuperficiais escuros assemelham-se aos horizontes sômbricos relatados inicialmente na África Central. A definição de horizonte sômbrico na classificação dos Estados Unidos é a mesma de há cinquenta anos, sem basicamente ter sofrido modificações. Nessa definição, o horizonte sômbrico é subsuperficial e constituído de húmus iluvial não associado ao alumínio ou sódio. Na classificação da FAO, tal definição basicamente incorporou a da classificação dos Estados Unidos, com pouca alteração. Isto se deve às poucas pesquisas a respeito da gê-nese desses horizontes. Neste trabalho de pesquisa analisaram-se três perfis de Argissolos do Estado de Santa Catarina: 1. O Argissolo Vermelho Alumínico (PVa), de Içara, tendo como material de origem siltitos com intercalação de arenitos; 2. OArgissolo Amarelo Distrófico (PAd), de Rancho Queimado, tendo como material de origem granitos e granulitos; 3. O Ar-gissolo Bruno-Acinzentado Alumínico (PBACal), de Alfredo Wagner, derivado de argilitos e siltitos. Também analisou-se um perfil de Luvissolo Crômico Pálico (TCp), de Bagé/RS que tem como material de origem granitos e gnaisses. Somou-se aos perfis relacionados um Cam-bissolo Húmico (CH) de Bom Jardim da Serra/SC, derivado de basalto. O CH é de região de altitude e sem horizonte subsuperficial escuro, tendo sido escolhido para servir como teste-munha nos resultados referentes às análises de delta 13C dos demais solos, de vez que apresen-ta vegetação de gramíneas há milênios. Efetuaram-se análises físicas, químicas, mineralógicas e micromorfológicas. Estudos de fracionamento da areia e de mineralogia por difração de raios-X objetivaram identificar descontinuidades litológicas. Análises micromorfológicas ob-jetivaram identificar se houve migração e acúmulo de compostos húmicos nos horizontes sub-superficiais escuros. Análises de dissolução seletiva de ferro e alumínio objetivaram identifi-car se ocorreram processos de podzolização. Estudos de isótopos de carbono tiveram por fina-lidade analisar se houve mudanças climáticas implicadas na gênese dos horizontes subsuperfi-ciais escuros. Os resultados foram inconclusivos para o TCp. Para o PAd e para o PBACal indicaram tratar-se de horizontes A soterrados por ação coluvionar. Para o PVa sugeriram haver migração de compostos argilo-húmicos. Nos Argissolos houve acúmulo de alumínio nos horizontes subsuperficiais escuros. Resultados de isótopos de carbono não identificaram ser a matéria orgânica oriunda de vegetação diferenciada da atual. Os solos não enquadraram-se no tipo sômbrico. Propõe-se à classificação dos Estados Unidos e à FAO a eliminação do requisito da ocorrência de húmus iluvial não-associado ao alumínio nos sômbricos. Propõe-se substituir esse requisito pela comprovação da ocorrência de húmus iluvial no sômbrico atra-vés de análises em lâmina delgada e através de evidências de ausência de descontinuidade litológica e ausência de horizonte ágrico e resultados de isótopos de carbono relacionados ao mesmo tipo de vegetação nos horizontes superficial e subsuperficial escuro. Propõe-se ao Sis-tema Brasileiro de Classificação de Solos a inclusão do caráter sômbrico, a ser contemplado no nível de Sub-Grupo
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Merger, Juri [Verfasser], i Alfio [Gutachter] Borzi. "Optimal Control and Function Identification in Biological Processes / Juri Merger ; Gutachter: Alfio Borzi". Würzburg : Universität Würzburg, 2016. http://d-nb.info/1115654896/34.
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Wongkaew, Suttida [Verfasser], i Alfio [Gutachter] Borzi. "On the control through leadership of multi-agent systems / Suttida Wongkaew. Gutachter: Alfio Borzi". Würzburg : Universität Würzburg, 2015. http://d-nb.info/1111784094/34.
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Mohammadi, Masoumeh [Verfasser], i Alfio [Gutachter] Borzi. "Analysis of discretization schemes for Fokker-Planck equations and related optimality systems / Masoumeh Mohammadi. Gutachter: Alfio Borzi". Würzburg : Universität Würzburg, 2015. http://d-nb.info/1110984677/34.
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Gathungu, Duncan Kioi [Verfasser], i Alfio [Gutachter] Borzi. "On Multigrid and H-Matrix Methods for Partial Integro-Differential Equations / Duncan Kioi Gathungu ; Gutachter: Alfio Borzì". Würzburg : Universität Würzburg, 2018. http://d-nb.info/1150644826/34.
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Milazzo, Alfio [Verfasser], i Marcus M. [Akademischer Betreuer] Schittenhelm. "P53-abhängige Sensitivität von Chemotherapie und ionisiertender Strahlung in kolorektalen Karzinomzellmodellen / Alfio Milazzo ; Betreuer: Marcus M. Schittenhelm". Tübingen : Universitätsbibliothek Tübingen, 2016. http://d-nb.info/1165309211/34.
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Stichel, Sabine [Verfasser], Gabriel [Akademischer Betreuer] Wittum, Alfio [Akademischer Betreuer] Grillo i Gillian [Akademischer Betreuer] Queisser. "Strömung in geklüftet porösen Medien / Sabine Stichel. Gutachter: Gabriel Wittum ; Alfio Grillo ; Gillian Queisser. Betreuer: Gabriel Wittum". Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2014. http://d-nb.info/1058913735/34.
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Ciaramella, Gabriele [Verfasser], Alfio [Gutachter] Borzi, Volker [Gutachter] Schulz i Georg [Gutachter] Stadler. "Exact and non-smooth control of quantum spin systems / Gabriele Ciaramella. Gutachter: Alfio Borzi ; Volker Schulz ; Georg Stadler". Würzburg : Universität Würzburg, 2015. http://d-nb.info/1111508968/34.
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Gaviraghi, Beatrice [Verfasser], i Alfio [Gutachter] Borzi. "Theoretical and numerical analysis of Fokker-Planck optimal control problems for jump-diffusion processes / Beatrice Gaviraghi ; Gutachter: Alfio Borzì". Würzburg : Universität Würzburg, 2017. http://d-nb.info/1128074400/34.
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Loesch, Boris Tobias von [Verfasser], Michael [Akademischer Betreuer] Ulbrich i Alfio [Akademischer Betreuer] Borzi. "A Class of Trust-Region Multilevel Methods / Boris Tobias von Loesch. Gutachter: Alfio Borzi ; Michael Ulbrich. Betreuer: Michael Ulbrich". München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1031513744/34.
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Loesch, Boris Tobias von Verfasser], Michael [Akademischer Betreuer] [Ulbrich i Alfio [Akademischer Betreuer] Borzi. "A Class of Trust-Region Multilevel Methods / Boris Tobias von Loesch. Gutachter: Alfio Borzi ; Michael Ulbrich. Betreuer: Michael Ulbrich". München : Universitätsbibliothek der TU München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20130111-1108085-0-8.
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Ryll, Christopher [Verfasser], Fredi [Gutachter] Tröltzsch, Alfio [Gutachter] Borzi, Harald [Gutachter] Engel i Eduardo [Gutachter] Casas. "Optimal control of patterns in some reaction-diffusion-systems / Christopher Ryll ; Gutachter: Fredi Tröltzsch, Alfio Borzi, Harald Engel, Eduardo Casas". Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156015472/34.
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Schindele, Andreas [Verfasser], Alfio [Gutachter] Borzi i Herbert [Gutachter] Köstler. "Proximal methods in medical image reconstruction and in nonsmooth optimal control of partial differential equations / Andreas Schindele. Gutachter: Alfio Borzì ; Herbert Köstler". Würzburg : Universität Würzburg, 2016. http://d-nb.info/1112041540/34.
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Breitenbach, Tim [Verfasser], Alfio [Gutachter] Borzi i Kurt [Gutachter] Chudej. "A sequential quadratic Hamiltonian scheme for solving optimal control problems with non-smooth cost functionals / Tim Breitenbach ; Gutachter: Alfio Borzi, Kurt Chudej". Würzburg : Universität Würzburg, 2019. http://d-nb.info/1188564781/34.
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Sprengel, Martin [Verfasser], Alfio [Gutachter] Borzi, Reinhold [Gutachter] Schneider i Fredi [Gutachter] Tröltzsch. "A Theoretical and Numerical Analysis of a Kohn-Sham Equation and Related Control Problems / Martin Sprengel ; Gutachter: Alfio Borzì, Reinhold Schneider, Fredi Tröltzsch". Würzburg : Universität Würzburg, 2017. http://d-nb.info/1140871188/34.
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Borchardt, Julia [Verfasser], Holger [Gutachter] Gies, Michael [Gutachter] Scherer i Alfio [Gutachter] Bonanno. "From condensed matter to higgs physics : solving functional renormalization group equations globally in field space / Julia Borchardt ; Gutachter: Holger Gies, Michael Scherer, Alfio Bonanno". Jena : Friedrich-Schiller-Universität Jena, 2017. http://d-nb.info/117760048X/34.
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Prohl, Raphael-Alexander [Verfasser], Gabriel [Akademischer Betreuer] Wittum i Alfio [Akademischer Betreuer] Grillo. "Ein verallgemeinerter Plastizitätsalgorithmus zur numerischen Behandlung von elasto-plastischen Materialmodellen unter großen Deformationen : mit Anwendungen für metallische Werkstoffe und biologische Gewebe / Raphael-Alexander Prohl. Gutachter: Gabriel Wittum ; Alfio Grillo". Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2016. http://d-nb.info/1083226290/34.
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Bald, M. "Development of textural differentiation in soils: a quantitative analysis". Thesis, 2012. http://hdl.handle.net/2440/91783.
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This item is only available electronically.A soil profile exhibiting strong textural differentiation between surface and subsurface horizons at Keyneton, South Australia, was sampled for quantitative and qualitative analyses of the processes responsible for development. From constant resistant mineral ratios throughout the profile it was concluded that the soil had formed from uniform parent material, suggesting that pedological processes had heavily influenced formation. Particle size distribution, clay mineralogy determined by XRD, and microstructural features indicated that clay accumulation in the subsurface was accompanied by a greater intensity of weathering in the surface horizons. The presence of void argillans in the B horizon provided strong evidence for the translocation of clay. Mass balance calculations showed significant volumetric expansion and mass gain throughout the entire profile, but greatest in the B horizons. Al, Fe, Na and Si were all gained in large quantities. The results indicate that clay translocation by illuviation is a dominant process in the development of textural differentiation, with some clay likely to have formed in situ.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical cinches, 2012
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Κόκκορης, Ιωάννης. "Οι ανθρώπινες επιδράσεις στα παρόχθια οικοσυστήματα του Αλφειού πόταμου : oι προοπτικές για την ολοκληρωμένη διαχείρισή τους". Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1702.
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Oι ανθρώπινες επιδράσεις στα παρόχθια οικοσυστήματα του Αλφειού πόταμου και oι προοπτικές για την ολοκληρωμένη διαχείριση τους.Human effect on habitats of the Αlfios River and their possibilities for sustainable development.
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Cerami, Alfio [Verfasser]. "Social policy in Central and Eastern Europe: the emergence of a new European model of solidarity? / Alfio Cerami". 2005. http://d-nb.info/974405647/34.
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