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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Capacidade de suporte da serapilheira da caatinga na recuperaÃÃo de solos degradados no semiÃrido / Carrying capacity of the caatinga litter in the recovery of degraded soils in semiarid

Eveline Viana Salgado 17 January 2014 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / O desenvolvimento de tÃcnicas exploratÃrias que respeitem as limitaÃÃes edafoclimÃticas, atravÃs de manejos de conservaÃÃo dos recursos naturais solo-Ãgua-planta à hoje objeto de estudo nas diferentes Ãreas do conhecimento. O objetivo desta investigaÃÃo foi definir um modelo de recuperaÃÃo das Ãreas degradadas no semiÃrido brasileiro pelo emprego da serapilheira produzida pelo bioma Caatinga, como tambÃm avaliar as mudanÃas nos atributos biolÃgicos, quÃmicos e fÃsicos ocorridas nos solos das Ãreas de retirada e deposiÃÃo da serapilheira. AlÃm de investigar a dinÃmica do regime pluviomÃtrico na produÃÃo e taxa de decomposiÃÃo da serapilheira do bioma caatinga. Este trabalho foi desenvolvido no municÃpio de General Sampaio, CearÃ, Brasil. Sendo composto por duas Ãreas experimentais, prÃximas e distintas, Ãrea 1 â RPPN Elias Andrade e Ãrea 2 â solo degradado. Os tratamentos foram definidos atravÃs de percentuais de cobertura do solo com a serapilheira, sendo estes: 0, 20, 40, 60, 80 e 100% de cobertura, o que corresponde a 0, 17, 34, 50, 67 e 83 kg, respectivamente, em parcelas de 25 m2. Em cada Ãrea de estudo foram aplicados seis tratamentos com quatro repetiÃÃes, com delineamento inteiramente casualizado com parcelas subdivididas (Ãrea 1) e delineamento em blocos casualizados com parcelas subdivididas (Ãrea 2), nas camadas de solo 0-5, 5-10 e 5-20 cm. Avaliou-se a produÃÃo anual de serapilheira correspondente aos anos de 2009/2010, como tambÃm a dinÃmica de forma espacial e temporal de alguns atributos edÃficos: atributos biolÃgicos (RBS, CBM e qCO2), quÃmicos (Ca, Mg, Na, K, MO e P) e fÃsicos (densidade do solo, umidade, porosidade total, macroporos e microporos), com amostras indeformadas e deformadas (compostas). Observou-se nesta investigaÃÃo que a produtividade mensal de serapilheira em RegiÃes semiÃridas apresenta relaÃÃo inversa com a precipitaÃÃo. Como tambÃm, o tempo de estudo foi considerado pequeno quando se refere ao processo evolutivo dos atributos do solo. O que se pÃde constatar foram tendÃncias de alguns atributos, relacionadas diretamente aos fatores edafoclimÃticos. / The development of exploratory techniques that respect the limitations edaphoclimatic through managements conservation of natural soil-water-plant is now the object of study in different fields of knowledge. The objective of this investigation was to define a model of recovery of degraded areas in the Brazilian semiarid region by the use of litter produced by the Caatinga biome, but also assess changes in attributes biological, chemical and physical soil occurred in the soil occurred in the areas of removal and disposal of litter. Besides investigating the dynamics of rainfall in the production and decomposition rate of litter in the Caatinga biome. This study was conducted in the municipality of General Sampaio, CearÃ, Brazil. Comprised of two experimental areas, near and distinct, area 1-PRNP Elias Andrade and area 2-degraded soil. Treatments were defined by percentage of soil cover with litter, which are: 0, 20, 40, 60, 80 and 100% coverage, which corresponds to 0, 17, 34, 50, 67 and 83kg, respectively, in plots of 25 m2. In each study area applied six treatments with four replications, with random block design with split plots (area 1) and random block design with split plots (area 2), the soil layers 0-5, 5-10 and 5-20cm. We evaluated the annual litter production corresponding to the years 2009/2010, as well as the spatial and temporal dynamics of some soil attributes: biological attributes (RBS, CBM and qCO2), chemical (Ca, Mg, Na, K, MO, P) and physical (bulk density, moisture content, porosity, macropores and micropores) in disturbed and undisturbed samples (composite). Observed in this investigation that productivity monthly litter in semiarid regions is inversely correlated with rainfall. As well, the study time was considered short when referring to the evolutionary process of the soil properties. What we could see some treds were attributes related directly to edaphoclimatic factors

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