Xeroseres旱生演替系列 (3)Presence of Shrubs and trees灌木、 乔木植物阶段 Seeds brought in by animals,water and wind begin to grow in the soil. Eventually enough soil is present for shrubs and trees to grow. 13 • (3) Presence of Shrubs and trees 灌木、 乔木植物阶段 – Seeds brought in by animals, water and wind begin to grow in the soil. – Eventually enough soil is present for shrubs and trees to grow. Xeroseres 旱生演替系列