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The temporal stability of spatial patterns of soil water contents was evaluated in a small rural catchment on the Sul-riograndense basaltic plateau, to identify sampling points that can reproduce the mean and extreme soil water content behaviours. The soil water content was monitored during one agricultural year. Samples were collected from a regular grid throughout the catchment, at 0 cm (soil surface) and 30 cm depth, and from two profiles, 280 m (Profile P1) and 320 m (Profile P3) long. The soil water content measurements were performed by gravimetric procedure at the surface and with TDR technique at deeper levels. Complete stability of soil water content spatial patterns at soil surface level was not observed, but it could be identified at 30 cm depth. Points with temporal stability in the catchment, especially at 30 cm depth and in profile P1 could be identified. The use of points of temporal stability allowed estimates of mean area of soil water contents with errors of less than 5% e 1% at the soil surface and 30 cm depth, respectively. Key-words: spatial variability; soil water content; small basins; temporal stability.

revista brasileira de recursos hídricos

Variabilidade Espacial do Conteúdo de Água no Solo numa Pequena Bacia Rural : 3. Análise da Estabilidade Temporal do Padrão Espacial do Conteúdo de Água no Solo