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EN: The use of trees in integrated crop-livestock-forestry systems (ICLF) allows diversifying production, increasing profitability per area, and providing a higher animal comfort. However, the influence of tree component on soil chemical attributes in this system is still little studied. This study aimed to assess the effect of trees and sun-exposed faces to solar radiation on soil nutrient availability at different distances of tree rows in an integrated crop-livestock-forestry system. This study was carried out in the northern Mato Grosso State, Brazil, in the Cerrado ? Amazon Forest transition region in an ICLF with the tree component formed by three eucalyptus rows. The assessment carried out in the second year of ICLF implantation considered the effect of tree distances (3, 6, 10, and 15 m) on two sun-exposed faces to solar radiation (north and south) on the main soil chemical attributes. Soil sampling was performed at depths of 0?0.05, 0.05?0.10, 0.10?0.20, and 0.20?0.30 m. The results indicated a homogeneity of the average nutrient contents obtained in the north and south-exposed faces, as well as in the comparison of the same distances in both assessed sun-exposed faces. Effects of trees on soil chemical attributes were verified only when an isolated analysis was carried out in the north-exposed face for K and Al contents. For these attributes, the increased distance in the row was associated with a reduction in their contents in the more superficial and deeper layers, respectively. Trees do not significantly affect soil nutrient availability in the first years of ICLF implantation in systems with homogeneity of solar radiation incidence in the sun-exposed faces although there may be discrete nutrient reductions with the distance of trees. | PT-BR: A insercao das arvores em sistemas de integracao lavoura, pecuaria e floresta (ILPF) permite diversificar a producao, aumentar a rentabilidade por area e proporcionar maior conforto animal. Entretanto, a influencia do componente arboreo sobre os atributos quimicos do solo neste sistema ainda e pouco estudada. Neste estudo, objetivou-se avaliar o efeito das arvores e das faces de exposicao solar sobre a disponibilidade de nutrientes no solo em diferentes distâncias de renques de arvores em um sistema de integracao lavoura pecuaria floresta. O trabalho foi realizado no norte do estado do Mato Grosso, em regiao de transicao Cerrado/ Floresta Amazonica em um sistema ILPF com o componente arboreo formado por renques de tres linhas de eucalipto. A avaliacao efetuada no segundo ano de implantacao do sistema ILPF considerou o efeito da distância das arvores (3, 6, 10 e 15 m) em duas faces de exposicao solar (norte e sul) sobre os principais atributos quimicos do solo. A amostragem do solo foi efetuada nas profundidades de 0-0,05; 0,05-0,10; 0,10-0,20 e 0,20-0,30 m. Os resultados indicaram homogeneidade dos teores medios de nutrientes obtidos nas faces norte e sul, bem como na comparacao das mesmas distâncias nas duas faces de exposicao avaliadas. Efeitos das arvores sobre os atributos quimicos do solo foram verificados apenas quando da analise isolada na face norte para os teores de K e Al. Para esses atributos, o aumento da distância do renque foi associado a reducao dos teores nas camadas mais superficiais e mais profundas, respectivamente. A disponibilidade de nutrientes no solo nao e afetada significativamente pelas arvores nos primeiros anos de implantacao do sistema ILPF em sistemas em que ha homogeneidade na incidencia de raios solares nas faces de exposicao, ainda que possa reducoes discretas de nutrientes com o distanciamento das arvores.

SOIL CHEMICAL ATTRIBUTES IN RESPONSE TO TREE DISTANCE AND SUN-EXPOSED FACES AFTER THE IMPLANTATION OF AN INTEGRATED CROP-LIVESTOCK-FORESTRY SYSTEM