Soil microbial community structure based on indicator lipids (n·mol g−1 soil) from the four sites.

Soil microbial community structure based on indicator lipids (nmol g−1 soil) from the four sitesa SS: pure Hippophae rhamnoides plantation; SY: mixed plantation with Hippophae rhamnoides and Pinus tabulaeformis; SB: mixed plantation with Hippophae rhamnoides and Platycladus orientalis; SC: mixed plantation with Hippophae rhamnoides and Robinia pseucdoacacia.b Total lipid was the sum of the 31 detected fatty acids.c The values were the means of three replicates. Different letters within columns indicate significant differences at p d G+ and G− represent gram-positive and gram-negative bacteria, respectively. G+/G− was the ratio of the sum of gram-positive bacteria to the sum of gram-negative bacteria.e Standard deviation.Soil microbial community structure based on indicator lipids (n·mol g−1 soil) from the four sites.