在这样的干燥地区，苔藓植物已经成为主要的土壤结皮植被类群。
On the dry environment area, bryophytes have become the main soil crust plants.
土壤线虫是这类土壤动物的典型代表，因为它们在大多数土壤中分布是丰富的，而且营养类群是多样的。
Soil nematodes are representative of a large portion of this fauna, since they are abundant and trophically diverse in most soils.
土壤微生物是由完全不同的和无孔不入的有机体类群所组成。
Soil micro-organisms constitute a diverse and ubiquitous group of organisms.
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