土壤结皮包括物理结皮和生物结皮两种类型。一般情况下,物理结皮指的是外力作用使土壤孔隙堵塞而成型的一层土表硬壳;生物结皮是指低等生物与土壤颗粒作用发育形成的复合生物土壤层。在荒漠化地区,地表出现生物结皮是固定沙丘形成的重要标志。已有研究表明:土壤结皮能够固定流 Soil crusts include both physical crusts and biological crusts. Under normal circumstances, the physical crust refers to the role of external forces to plug the pores of the soil formed by the formation of a hard shell; bio-crust refers to the lower organisms and the role of soil particles formed by the complex biological soil layer. In desertification areas, the appearance of biological crusts is an important symbol of the formation of a fixed sand dune. Studies have shown that soil crusts can be fixed flow