Coefficients of variation (CV) versus annual mean soil water concentration from 1989 (pre-treatment year) to 2006 for WS3 (treatment) and WS4 (control). Points in graph are combinations of soil water for A and B horizon lysimeters. Shown also are the combined means of CV and concentration (i.e., centroids) and the location of the pretreatment year (1989) for WS3 and WS4. Line represents linear correlation (, ) for WS3 only.