Abstract:To investigate the effect of development stage on soil C:N:P stoichiometry characteristics of Nitraria tangutorun nebkhas. Taking Nitraria tangutorun nebkhas at different development stages (for rudimental stage, developing stage, stabilizing stage and degrading stage) in desert area of Jilantai as research object, and measure vertical distribution of soil C:N:P stoichiometry from 0 cm to 100 cm in depth under Nitraria tangutorun nebkhas. The results showed that:(1) Soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) showed first increased and then decreased with the succession of N. tangutorum nebkhas (rudimental stage→developingstage→stabilizingstage→degrading stage). The effect of succession stage on SOC was significant (P<0.05), but not on TN and TP (P>0.05). The contents of SOC, TN and TP in the four stages of evolution were 0.42~0.58 g/kg, 0.04~0.07 g/kg and 0.22~0.25 g/kg in 0—100 cm soil depth, respectively, and the contents was far less than national average levels (11.12, 1.06, 0.65 g/kg). (2) There was no obvious change rule for the contents of SOC, TN, TP and soil C:N:P stoichiometry in the four succession stages of Nitraria tangutorun nebkhas decreased with the increase of soil depth. (3) The content and stoichiometry of SOC, TN and TP belonged medium variability, and which decreased with the increase of soil depth. (4) Soil bulk density, soil capillary porosity and non-capillary porosity had significant effect on TN, C:N, N:P, and soil water content and pH had no significant effect on the contents of SOC, TN, TP and soil C:N:P stoichiometry. Confirm the importance of SOC and TN in regulating the soil C:N:P stoichiometry of Nitraria tangutorun nebkhas. Therefore, the present results clarify the response of C:N:P stoichiometry of Nitraria tangutorum to different succession stages. It provides scientific basis for the protection, utilization and vegetation restoration and reconstruction of Nitraria tangutorum community in this area.