Comparison of Acacia saligna seed bank density (a) and seedling emergence from the seed bank (b) in the control and the solarization treatment. The samples were taken in the first spring (March) after treatment. Means of either seed number per liter of soil or seedling emergence per m2 represent 16 samples (replicates) of 0–5 cm soil depth. Significance levels *** = P < 0.001 according to a contrast t-test.