The soils in 0-10 cm layer and the corresponding environmental factors in 77 sampling plots of three typical shrub communities in the Gurbantunggut Desert were surveyed, and the soil stoichiometric characteristics of soil organic carbon (C), total nitrogen (N), total phosphorus (P) and total potassium (K) and their influencing factors were studied. The results showed that the average soil C, N, P and K contents were 1.057, 0.133, 0.319 and 14.11 g·kg-1, respectively; and the average soil C∶N, C∶P, C∶K, N∶P, N∶K and P∶K were 8.124, 3.486, 0.099, 0.434, 0.013 and 0.034, respectively. By contrast, the soil nutrient contents and their stoichiometric ratios were far lower than global and Chinese levels. The soil C∶N and P represented high stability (CV=19.26% and 22.46%), while soil K, C∶K, N∶K and P∶K showed moderate variability (CV=52.17%-80.30%). The soil stoichiometric traits differed to a certain extent in different community types and in different biological soil crust types. Quadratic function, power function and exponential function can be used to characterize the non-linear coupling relationships of C vs. N, C vs. K, P vs. K, and soil nutrients vs. their stoichiometric ratios. The correlation analysis and CCA ordination indicated that, except for soil C∶N (which was not affected by any environmental factor in this study), the soil stoichiometric traits were mainly influenced by longitude, latitude, mean annual precipitation, developmental level of biological soil crust, electrical conductivity and elevation.
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