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O presente trabalho teve como objetivos caracterizar o meio fisico na regiao do alto curso do rio Banabuiu, Sertao Central do Ceara, a partir de uma abordagem sistemica, identificando diferentes unidades de relevo, avaliando seus graus de vulnerabilidade natural, bem como os riscos de degradacao frente ao uso das terras. Para tanto, foram elaborados mapas de geologia, declividade, unidades de relevo e de solos. A sobreposicao dos referidos mapas a partir do metodo de multicriterio aditivo, permitiu a geracao do mapa de vulnerabilidade natural, que cruzado ao mapa de uso e cobertura das terras pelo mesmo metodo, originou o mapa de risco de degradacao. Foram identificadas as seguintes unidades de relevo Interfluvios Estruturais, Cristas Residuais, Superficie Colinosa, Encosta Estrutural Dissecada, Pediplano Dissecado, Vale do rio Banabuiu e os Inselbergues. Quanto a vulnerabilidade natural constatou-se que em 10,10%, 44,84%, 19,52%, 12,59% e 11,82% esta variou de baixa, moderada, alta, muito alta e altissima respectivamente. A analise do mapa de degradacao, resultado da sobreposicao do mapa de fragilidade ao de uso e cobertura das terras permitiu inferir que 2,97%, 25,83%, 35,57%, 17,10% e 15,60% das terras da area de estudo apresentaram risco de degradacao baixo, moderado, alto, muito alto e altissimo, respectivamente. Constatam-se mudancas substanciais entre as classes, revelando uma forte pressao antropica, e o comprometimento dos recursos naturais. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:PT-BR;} A B S T R A C T This study aimed to characterize the physical environment in the region of the upper course of the river Banabuiu, Ceara Central Wilderness, from a systemic approach, identifying different landscape units, assessing their degree of natural vulnerability and the risk of degradation by the use of land. Therefore, geology maps were drawn, slope, relief and soil units. The overlap of these maps from multicriteria additive method, allowed the creation of a map of natural vulnerability, which crossed with the map of use and coverage of land by the same method, originated the degradation risk map. The following relief units were identified: structural interfluves, residual ridges, hilly area, dissected structural hill, dissected pediplain, Banabuiu river valley and inselbergs. As the natural vulnerability, is found that for 10.10%, 44.84%, 19.52%, 12.59% and 11.82% this varied from low, moderate, high, very high and very high, respectively. The analysis of the degradation map, resulting from the overlap of the fragility map and the use and coverage of land map allowed to infer that 2.97%, 25.83%, 35.57%, 17.10% and 15.60% of the land of the study area showed low risk of degradation, moderate, high, very high and very high, respectively. Substantial changes are seen between classes, revealing a strong anthropic pressure, and the commitment of natural resources. Keywords: Systemic Approach. Vulnerability. Degradation.

Análise da Vulnerabilidade Natural e do Risco de Degradação no Alto Curso do Rio Banabuiu-CE (Analysis of natural vulnerability and risk of degradation in upper course of Banabuiu River   CE)