中生演替的在一中等潮湿的环境里发生的。
然后，土地若被荒废，则会发生次生演替，植物在更适宜的土壤中生长得更快。
If the land is then abandoned, a secondary succession will take over, developing much faster on the more hospitable soil.
藻类和苔藓植物是荒漠植被演替过程中常见的两类先锋植物，同时也是生物结皮中生物量最大的2个类群。
Algae and mosses are not only two common pioneer plants in the process of vegetation succession but also two groups with the highest biomass in the biological soil crust.
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