How was the knowledge of ecological succession applied to the reclamation of land damaged due to mining?

After mining, to reclaim the land, the depression is filled with rocks then the top is filled with loosely graded soil. Introduction of early succession plants is important before big trees can grow. The early succession plants help in the breaking down of the rocks into soil hence making the topsoil deeper to support trees.  

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck