Fig. 1From: Changes in soil fertility and microbial communities following cultivation of native grassland in Horqin Sandy Land, China: a 60-year chronosequenceSoil nutrient contents in response to different periods of continuous cultivation: A soil organic carbon (SOC); B total nitrogen (TN); C available phosphorus (AP); D available potassium (AK). Bars sharing lower case letters are not significantly different at p < 0.05Back to article page