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Caatinga, a biome of deciduous dry forest and shrub vegetation, predominates in the semiarid northeastern region of Brazil. In this dry biome, research on soil nematode community structure and spatial distribution is scarce but helpful to address soil management. In this work the spatial variability of nematode communities was studied in relation to soil properties. Plant-parasitic nematodes (PPN) was the dominant trophic group followed by bacterivores, omnivores, fungivores and predators. PPN positively correlated with both soil coarse sand and water content, whereas omnivores and bacterivores negatively correlated with coarse sand and clay fraction, respectively. Despite differences in density, omnivores, bacterivores and fungivores were quite similar in spatial patterns. The low dominance of Dorylaimidae (0.64%) and the high dominance of PPN (84.53%) indicates a high level of human intervention in the experimental plot.

Community structure and spatial variability of soil nematodes in an alluvial soil in a semiarid region of Pernambuco state, Brazil