Deforestation through os sloping in Ibirubá, RS
DOI:
https://doi.org/10.5902/2179460X24921Abstract
The presente work aims at the evaluation of degree of deforestation, relating it to various classes of sloping in Ibirubá County, State of Rio Grande do Sul, Brazil.
Four maps were drafted: one of them with the degree of slope and three with forest areas corresponding to the time periods of 1956, 1965 and 1975. The map of slope classes was based upon the soil classification map of the county and on categories slope obtained through photogrametry. The forest maps were done by using photogrametry of the three above dates.
The results show that for the original forest area the deforestation started more intensively intensity in the class of 8 to 15% slope. In spite of the 2 to 8% class offering good topographc and agricultural conditions, the main forest reserves are found in this are and border on the back line of rural properties. Such reserves have gradually been used for agricultural activities especially in the period from 1965 to 1975. In the classes of slope less than 2% and more than 15% there was less deforestation due to the topographic conditions.
In the original field area the deforestation went over all classes of slope more intensily where the topographical conditions favored the agricultural activity occupation, i.e., in the 2 to 8% and 8 to 15% slope classes.
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