Doutorado Aprovado em outras Instituições Acadêmicas https://repositorio.ufra.edu.br/jspui/handle/123456789/288 2026-07-04T01:22:02Z 2026-07-04T01:22:02Z MARTINS, Ana Regina Araújo https://repositorio.ufra.edu.br/jspui/handle/riufra/2888 2026-06-10T12:14:55Z 2001-01-01T00:00:00Z

Título: Dinâmica de nutrientes na solução do solo em um sistema agroflorestal em implantação. Autor(es): MARTINS, Ana Regina Araújo Abstract: The agroforestry systems constitute an alternatíve to produce foods, wood and other non-wooden products, also playing an excellent role in the conservation and maintenance ofthe functions oftropical ecosystems. That being so, a agroforestry system with maize, cowpea, jack beans and cassava in rotation were studied in the area of CEPLAC, following the procedures ofthe Program" SHIFT - Studies on Human Impact on Forests and Floodplains in the Tropics ", in Benevides, Pará, near Belém. During the studied period between 1995/1996, the following parameters were registered: precipitation and saturation ofthe soil water (tensiometers in the depths 10, 45 and 145 cm), the chemical composition of the solution of rain (rain gauges) and the ground (lysimeters in depths 25, 40, 60 and 110 cm), the exported harvest ofthe field and its content of nutrients, and the residue from the remaining biomass in the field and its content of nutrients. The emphasis was in the study of the fluctuations in the chemical composition ofthe soil solution and in its dependence on the human activity in the field, aiming to get adaptable information to the reality ofsmall and medium producers. The most important observation verified was that the N was the element with the biggest relative importance in this work, for being present in bigger amounts in the soil solution in the band of25 cm, followed by the Ca, Mg, K, CI and Na. The effective participation ofthe CI and the Na in the cycling processes was a surprise, probably generated by the high amount ofthese in the rainwater. The S-SO4 and the AI had little importance for presenting small amounts. The other elements, Fe, Mn, H, P-PO4 appear in very low amounts. A system of rotational handling, and in association, suggests a faster and more intensive dynamics, thus the concentration of the elements studied in the soil solution was always higher in the agroforestry system than that in the forest. However, the observations during the studied period showed that the Na, CI and AI are less sensitive to the handling of the vegetation, whereas the Ça, Mg, K, N-NH4, N-N03 and S-S04 are more affected by the developed activities inside the agroforestry system. Specifically regarding the Na and CI, the concentration of these elements in the forest suffered influences :from the action of rain, :from impact of the dry deposition (bum) and :from the sea water, even so the participation of these ones in the agroforesty system is corroborated. The handling activities developed inside the agroforestry system (plantation, weeding, thinning, harvesting, pruning) generated additions and losses of nutrients promoting a fluctuation in the course of time. These fluctuations were observed mainly for the Ca, K, N-N03, CI and Na. The K was put into motion faster than the Ca in the soil solution. The S-S04 presented a small fluctuation, contrary to the N-N03 and the Cl. For the N-N03, Ca, Mg and K, the cause of the fluctuations was the sarne, that is, release and absorption.

2001-01-01T00:00:00Z DINIZ, Victor Wagner Bechir https://repositorio.ufra.edu.br/jspui/handle/riufra/2885 2026-05-29T15:46:21Z 2026-05-07T00:00:00Z

Título: Determinação e especiação de elementos traço em plantas medicinais comercializadas na cidade de Belém-PA. Autor(es): DINIZ, Victor Wagner Bechir Abstract: This study presents the determination of Ca, Cu, Fe, Mg, Mn and Zn in ten medicinal herbs form the Amazon, pariri (Arrabidaea chica), aroeira (Schinus terebinthifolia), insulina (Cissus sicyoides), unha de gato (Uncaria tomentosa), graviola (Annona muricata), peão branco (Jatropha curcas), malva branca (Sida cryphiopetala), lacre (Vismia guianensis), perpétua roxa (Gomphrena globosa) e vinagreira roxa (Hibiscus sabdariffa),marketed in the city of Belém-PA. The samples were digested with HNO;3 and HzO, in block digester and tea were made with deionized water boiling, samples were analyzed by FAAS and the accuracy was evaluated with certified reference material GBW07604, the results were interpreted with the aid of PCA and HCA, which mat it possible to highlighted the high correlation between Cu and Fe and also between Ca, Mg, Mn and Zn. In the sample digested the levels ranged from 1.9-26.3% for Ca, 4.0-10.6 ug g”' of Cu, 99.1-345.2 ug g” of Fe, 0.14-1.6% of Mg, 9.6- 154.7 ug &"* of Mn and 9.4-216.2 ug g” of Zn. In teas, levels ranged from 0.33-2.4% for Ca, 0.5-2.1 ug g of Cu, 1.5-30.2 ug g' of Fe, 0.03-0.95% of Mg, 2.9-49.1 ug g' of Mn and 1.2- 60.7 ug g” of Zn. insulina, graviola, peão branco e fruta pão (Artocarpus altilis) are medicinal herbs used in the treatment of diabetes. Was evaluated the content of Cr (VI) in these samples. The methodology extracted Cr (VI) from the leaves of these herbs with Na;CO; and then was analyzed by GF AAS together with their digested, they suffered the opening process in the microwave with the aid of HNO; 50% (v/v) and H2O, under conditions previously evaluated and adjusted. The samples tested showed no risks of contamination of Cr (VD) to its consumers. Cr levels ranged between from 733.26-2449.29 ug kg" in digested, 46.20-363.78 ug kg"! for Cr (VI) total and 41.09-309.03 ug kg" for Cr (VI) in water soluble. A method for extraction of Fe”* by cloud point using APDC as complexing was optimized in order to find the condition which that the maximum amount of Fe?” and the minimum amount of Fe” later this condition was tested in six samples of medicinal herbs from Amazon Pariri, Insulina, Unha de gato, Graviola, Peão branco e Vinagreira roxa and in five of them was not detected Fe””, only a sample of Vinagreira roxa which showed 5.34 ug gg of Fe”.

2026-05-07T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/riufra/2878 2026-05-19T19:25:47Z 2026-04-22T00:00:00Z

Título: Comportamento Ecofisiológico e Fitopatológico de bananeiras (Musa sp.) em solo artificialmente infestado por Fusarium oxysporum f sp cubense (E.F. Smith) sn. & Hansen, nas condições da Amazônia Oriental. Abstract: Eventhough the tropical areas have environmental potentialities to banana production, there are few researches about the relationship between biophysics varieties and the environmental factors as well as phytopathologics aspects. In Brazil, this is the first research linking physiologics, ecologics, and phytopathologics aspects in banana plants. On this way, this research had , as purpose, to evaluate banana plant ecophysiologic and phytopathologic behavior, when in soil artificially infested with Fusarium oxysporum f.sp. cubense, at rainy and dry periods, in Belém — Pará metropolitan medium region. Eight banana plant cultivars (“Mysoure”, “Yangambi”, “Ouro-da-mata”, “Maçã”, “Thap maeo”, “PV 0344”, “PA 0322”, and “PA 1203”) were cultured on yellow latosoil, medium texture, obeying the experimental curve of blocks casually. In field conditions, height increasing, transpiration, stomatal conductance, normal leaves number, leaves lifetime, leaves emission velocity, total leaf area, photossynthetic rate, and productivity were mensured on healthy plants and plants infested with Panama disease. In laboratory, the water leaf relative content, total soluble carbohidrates and total soluble proteins contents , and leaves stomatal density were determined. The results showed that transpiration and stomatal conductance were reduced since leaf 4 (dry period) and leaf 5 (rainy period), on basipetal way. The transpiration increased since first hours in the morning, until the noon, decreasing during the afternoon. Stomal conductance decreased, gradually, since first hours in the morning. Both Transpiration and Stomatal Conductance got almost insignificant values in the end of afternoon, and also suffered drastic reduction, at dry period, and vapour pressure deficit, in soils which had grate water content, was the variable that had more influence on closing stomatal. Transpiration and stomatal conductance, on abaxial surface, were superior than the one's observated on adaxial surface, and that one had a stomatal density upper than the last, at least, about four times. At dry period, the water soil avaiability seems to have more influence than vapour pressure deficit on closing stomatal mechanism, because it carried out high influence on the leaves water content reduction. Also, there was a reduction on the normal leaves number and on total leaf area, eventhough the leaves emission velocity had been similar to the one observed at rainy period. There was a reduction on photosynthetic rate, transpiration, and stomatal conductance, in desease plants, only when Panama disease Symptoms occurred. chlorophill a , chlorophill b , and chlorophill (a+tb ) contents didn't have differences between the cultivars, however, with the evolution on desease symptoms, it was verified that it happened, simultaneousiy, degradation of chlorophill a and chlorophill b, as well as, others photossynthetic units. The solubles carbohidrates content increased significantly at dry period, but the solubles proteins content didn't change between both periods. On the other side, reductions on these compounds content occurr in disease plants, and carbohidrates content were more rapidly altered than proteins contents. All banana plant cultivars showed low productivities, and “PA 1203” had higher potential of productivity.

2026-04-22T00:00:00Z MARTINS, Ana Regina Araújo https://repositorio.ufra.edu.br/jspui/handle/riufra/2872 2026-05-06T14:06:03Z 2001-01-01T00:00:00Z

Título: Dinâmica de nutrientes na solução do solo em um sistema agroflorestal em implantação. Autor(es): MARTINS, Ana Regina Araújo Abstract: The agroforestry systems constitute an alternatíve to produce foods, wood and other non-wooden products, also playing an excellent role in the conservation and maintenance ofthe functions oftropical ecosystems. That being so, a agroforestry system with maize, cowpea, jack beans and cassava in rotation were studied in the area of CEPLAC, following the procedures ofthe Program" SHIFT - Studies on Human Impact on Forests and Floodplains in the Tropics ", in Benevides, Pará, near Belém. During the studied period between 1995/1996, the following parameters were registered: precipitation and saturation ofthe soil water (tensiometers in the depths 10, 45 and 145 cm), the chemical composition of the solution of rain (rain gauges) and the ground (lysimeters in depths 25, 40, 60 and 110 cm), the exported harvest ofthe field and its content of nutrients, and the residue from the remaining biomass in the field and its content ofnutrients. The emphasis was in the study ofthe fluctuations in the chemical composition ofthe soil solution and in its dependence on the human activity in the field, aiming to get adaptable information to the reality ofsmall and medium producers. The most important observation verified was that the N was the element with the biggest relative importance in this work, for being present in bigger amounts in the soil solution in the band of25 cm, followed by the Ca, Mg, K, CI and Na. The effective participation ofthe CI and the Na in the cycling processes was a surprise, probably generated by the high amount ofthese in the rainwater. The S-SO4 and the AI had little importance for presenting small amounts. The other elements, Fe, Mn, H, P-PO4 appear in very low XI amounts. A system of rotational handling, and in association, suggests a faster and more intensive dynamics, thus the concentration of the elements studied in the soil solution was always higher in the agroforestry system than that in the forest. However, the observations during the studied period showed that the Na, CI and AI are less sensitive to the handling of the vegetation, whereas the Ça, Mg, K, N-NH4, N-N03 and S-S04 are more affected by the developed activities inside the agroforestry system. Specifically regarding the Na and CI, the concentration of these elements in the forest suffered influences :from the action of rain, :from impact of the dry deposition (bum) and :from the sea water, even so the participation of these ones in the agroforesty system is corroborated. The handling activities developed inside the agroforestry system (plantation, weeding, thinning, harvesting, pruning) generated additions and losses of nutrients promoting a fluctuation in the course of time. These fluctuations were observed mainly for the Ca, K, N-N03, CI and Na. The K was put into motion faster than the Ca in the soil solution. The S-S04 presented a small fluctuation, contrary to the N-N03 and the Cl. For the N-N03, Ca, Mg and K, the cause of the fluctuations was the sarne, that is, release and absorption.

2001-01-01T00:00:00Z