Adaption of the agricultural use and estimate of the environmental degradation of the lands in the rivulet Una Watershed, Sape-PB-Brazil / Adequação do uso agricola e estimativa da degradação ambiental das terras da microbacia hidrografica do riacho Una, Sape-PB

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Increasing in expansion of agricultural activity without take into account land potentiality and restrictions is currently a potential source for environment degradation. This present work aims to evaluate some physical characteristics of lands from Watershed of Una Rivulet in Sapé, PB, Brazil, by utilizing the soil use capability classes, and to determine its environmental degradation into the context of Universal Soil Loss Equation ? USLE and from the use of physical-conservationist, socioeconomic and environmental diagnosis informations. The area is located at the east sector of Paraiba State between the following geographic coordinates: 35º08?16? -35º15?12? longitude, west of Greenwich and 06º59?18? - 07º05?42? south latitude. The accomplished procedures draw on geoprocessing system and the integration of achieved informations has utilized the geographic information system Idrisi Kilimanjaro version 14.0. Crossing informations of land use capacity and current use had utilized been as a means to determine for adequateness of land utilization then to define the following three main class of land use: adequate, inadequate and areas of preservation. In the evaluation of the land agricultural potentiality it was found that 61,9% of the area is being utilized adequately, 20,4% is utilized above of its predictable environmental capability and finally 14,9% is found to keep vegetal covering and is taken as preservation area. The classification of the current risk for land degradation, due to soil erosion, has revealed it to be very low in about 92,9% of the area of watershed. And no more than 1,5% of lands at that area is into the class of high to very high risk of erosion. In the estimations of the environmental degradation, by utilizing the physical-conservationist, socio-economic and environmental diagnosis, there have ambience degradation of by 34,4% and it represents by 2406,26 ha of the studied area. The impact from socio-economic factors with regard degradation of watershed is well known and is around of 61,3%. The data show that Watershed of Una Rivulet presents good agro-environmental qualities, which are characterized through a low expectation for soil erosion and the fact that 60% of its soils can be well utilized for agricultural practices

ASSUNTO(S)

solos - degradação degradation environmental geographic information systems degradation soil sistemas de informação geografica solo - uso degradação ambiental land use

ACESSO AO ARTIGO

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