Fig. 1 Soil properties and soil microbial biomass in different groups. (a), pH; (b), SWC (soil water content); (c), EC (electrical conductivity); (d), SOC (soil organic carbon); (e), TN (total nitrogen); (f), TP (total phosphorus); (g), MBC (microbial biomass carbon); (h), MBN (microbial biomass nitrogen); (i), MBP (microbial biomass phosphorus). D, drought; SA, saline-alkaline; DSA, combined stress of D and SA. Boxes indicate the IQR (interquartile range, 75th to 25th of the data). The median value is shown as a line within the box. Outlier is shown as black point. Whiskers extend to the most extreme value within 1.5×IQR. Different lowercase letters indicate significant differences at P<0.050 level among different groups.
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