《Table 2 Characteristics of environmental variables (precipitation and soil parameters) in the five

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《"Precipitation and soil particle size co-determine spatial distribution of biological soil crusts in the Gurbantunggut Desert,China"》

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Note:Sites 1，2，3，4 and 5 are the southern，central，northern，western and eastern sites of the Gurbantunggut Desert，respectively.EC，electrical conductivity；SOC，soil organic carbon.Different lowercase letters in the same column indicate significance a

In the Gurbantunggut Desert，there were significant differences not only in the dominant types of BSCs but also in the percentage cover at a macro scale.The highest total cover of BSCs occurred in the southern site of the desert where moss and lichen crusts covered almost the entire soil surface（Table 1）.BSCs were slightly less abundant in the central site of the desert and sparsest in the eastern site where the covers of cyanobacteria and lichen crusts were 23.83%and 1.54%，respectively.In the western site，the interdune surface was covered by 2.16%moss crusts，28.72%cyanobacteria crusts and 59.99%lichen crusts.In contrast，in the northern site，the covers of cyanobacteria crusts，lichen crusts and moss crusts were 55.32%，24.48%and 1.02%，respectively.