Soil carbon levels vary by land type, impacting ecosystem health.
The study looked at how soil organic carbon levels vary in different types of land in a hilly region. They examined jujube orchards, 7-year-old grasslands, croplands, and 30-year-old grasslands. The results showed that soil organic carbon decreased as you went deeper into the soil. The 7-year-old grasslands had the lowest levels, followed by croplands, jujube orchards, and 30-year-old grasslands. The differences were most significant in the top 20 cm of soil.