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Accueil du site → Doctorat → Brésil → AVALIAÇÃO DAS POTENCIALIDADES DAS TERRAS, ADEQUAÇÃO DO USO DAS TERRAS E INDICADORES DE QUALIDADE DOS SOLOS : subsídios para o planejamento conservacionista no perímetro irrigado de Mirorós (Ba).

Universidade Federal de Sergipe (2010)

AVALIAÇÃO DAS POTENCIALIDADES DAS TERRAS, ADEQUAÇÃO DO USO DAS TERRAS E INDICADORES DE QUALIDADE DOS SOLOS : subsídios para o planejamento conservacionista no perímetro irrigado de Mirorós (Ba).

Sanchez Klein Patrícia Salvador

Titre : AVALIAÇÃO DAS POTENCIALIDADES DAS TERRAS, ADEQUAÇÃO DO USO DAS TERRAS E INDICADORES DE QUALIDADE DOS SOLOS : subsídios para o planejamento conservacionista no perímetro irrigado de Mirorós (Ba).

Auteur : Sanchez Klein Patrícia Salvador

Université de soutenance : Universidade Federal de Sergipe

Grade : Doutor em Geografia 2010

Résumé
The practice of irrigated agriculture represents an increase of agricultural productivity, especially for areas with water deficit. Lands are frequently characterized erroneously which, coupled with lacking conservation measures, imposes serious consequences for the environment. In reality, any land use and intensive soil management when carried out unsustainably, can result in degradation processes. This study aims to provide subsidies for a conservationist planning in the Irrigated Perimeter of Mirorós, based on the rational use of land and adequate soil management. The perimeter is located in a semi-arid region of Bahia State (Brazil), municipality of Ibipeba, micro-region of Irecê. The following methods were adopted to evaluate the perimeter : evaluation of the edapho-climatic land potential, evaluation of the land potential for irrigation, determination of rates of land use adequacy as well as the use of indicators of soil quality for two kinds of land use (with and without irrigation). Thereby it was possible to define priority areas for intervention regarding land use and soil management (projected for conservation, recovery or recovery/preservation) and to identify the main susceptibilities for degradation processes or for improvements in soil quality, which have proven fundamental for conservationist planning strategies. The results showed that irrigated agriculture resulting in changes in the classification of land and greater impairment of soil quality, especially due to the susceptibility to the processes of compaction, salinisation and sodification, when compared to other uses without irrigation. On the other hand, the irrigated soils showed greater susceptibility to improvements in fertility and acidification. In fact, the negative effects as well as the improvements in soil quality were noted, in a smaller scale, in soils with other usage without irrigation. In general, the land of the perimeter in Mirorós possesses the potential for general agricultural use or for irrigated agriculture, but there is urgent need for interventions in soil management, including necessities of conservation or priority conservation. Additional interventions in usage are needed in areas that are being used in excess of their potential, resulting in the recovery/priority preservation of these areas. Furthermore, there are existing demands for interventions both in usage and management, resulting in areas that are priority for recovery. The proposed methods can be considered essential tools for the conservation of the natural resources in the study area, contributing towards sustainability in an agricultural environment.

Mots clés : soil degradation processes ; improvements in soil quality ; Potencial edafoclimático ; potencial para irrigação ; uso das terras ; processos de degradação dos solos ; melhorias na qualidade do solo ; GEOGRAFIA ; Edapho-climatic potential ; potential for irrigation ; land use

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Page publiée le 16 juin 2013, mise à jour le 10 juillet 2017