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Com a expansao da agricultura as florestas tem sido fragmentadas, modificando a dinâmica dos seus processos refletindo na fertilidade do solo. Esse estudo teve como objetivo avaliar o efeito de borda na fertilidade do solo em um fragmento florestal na regiao Sudoeste da Bahia. Para isso a area foi dividida em faixas verticais iniciando 50 metros apos a borda, adentrando ate 300 metros no fragmento. Em cada uma das faixas foram tomadas 3 amostras compostas nas profundidades de 0-5, 5-10, 10-20 cm. Analisando os atributos quimico e calculando a soma de bases, CTC a pH7 e a saturacao por bases (V%). Tambem foram quantificados os teores de carbono orgânico (COT) nas areas de estudo. Foram observadas diferencas na fertilidade do solo da borda para o interior do fragmento.  Verificou-se que os atributos Ca 2+ , H + +Al 3+ , S, T, COT foram os mais sensiveis em relacao ao efeito de borda. A area semi-interna (SI) distando 150-200 metros, de maneira geral foi a que apresentou os maiores valores de fertilidade do solo, possivelmente devido aos maiores teores de materia orgânica acumulada.   Soil fertility as edge effect indicator in a forest fragment, Vitoria da Conquista, Bahia Abstract: With the expansion of agriculture forests have been fragmented, changing the dynamics of their processes reflecting soil fertility. This study aimed to evaluate the edge effect on soil fertility in a forest fragment in the Southwest Bahia region. For this area was divided into vertical strips starting 50 meters after the border, entering up to 300 meters in the fragment. In each of the tracks were taken 3 composite samples at depths of 0-5, 5-10, 10-20 cm. Analyzing the chemical attributes and calculating the sum of bases, CTC at pH 7 and base saturation (V%). Also the organic carbon levels were quantified (COT) in the study areas. Differences were observed at the edge of soil fertility into the fragment. It was found that attributes, Ca 2+ , H + +Al 3+ , S, T, COT were the most sensitive in relation to the edge effect. The semi-internal area (SI) 150-200 meters distant in general was the one with the highest soil fertility values, possibly due to higher levels of accumulated organic matter.

Fertilidade do solo como indicador do efeito de borda em fragmento florestal, Vitória da Conquista, Bahia