Soil Microbial Biomass and Enzyme Activity Influenced by Plant Species Diversity in Secondary Forests

Strategic Insights -

Research on the impact of soil substrate availability and plant species diversity on soil microbial biomass and enzyme activity in secondary forests has revealed significant findings. According to a study published in the Journal of Soils and Sediments, different forest types have varying effects on soil substrate availability and soil microbial diversity, which in turn affects soil carbon sequestration and soil quality. The study, which was conducted in a subalpine natural secondary forest, found that soil microbial biomass and enzyme activity were significantly influenced by the availability of nitrogen and plant species diversity.

Key Takeaways:

  • The study found that soil microbial biomass was significantly higher in forests with higher species diversity, but the effect of forest type on microbial activity varied depending on the substrate availability.
  • The researchers found that the soil quality index (SQI) was significantly correlated with soil microbial biomass and enzyme activity, indicating that SQI is a key factor in regulating microbial activity in secondary forests.
  • The study emphasized the importance of plant species diversity and nitrogen availability in influencing soil microbial biomass and enzyme activity, and suggested that applying nitrogen fertilizer and replanting nitrogen-fixing tree species could enhance soil microbial activity and soil quality.
  • The research also noted that redundancy analysis showed that different soil microbial biomass and enzyme activity were mainly regulated by SQI, alkali-hydrolyzable N (AN), NO3--N, and Shannon diversity index of the tree layer and herb layer.
  • The study concluded that variance partitioning analysis demonstrated that AN had a greater impact on soil microbial biomass and enzyme activity compared to plant species diversity.

Statistics:

  • The study analyzed three different natural secondary forests with similar soil parent materials, each with different forest types.
  • The researchers found that soil microbial biomass carbon (MBC) was significantly higher in one of the forest types, but not significantly affected by the other trees.
  • The study also found that the variation in soil quality index was similar to MBC, and that soil microbial biomass and enzyme activity were significantly responsive to the SQI.
  • The researchers noted that the results of the study have implications for applying nitrogen fertilizer and replanting nitrogen-fixing tree species to enhance soil microbial activity and soil quality in natural secondary forests.

Sources:

  • "Influence of Soil Substrate Availability and Plant Species Diversity On Soil Microbial Biomass and Enzyme Activity In a Subalpine Natural Secondary Forest." Journal of Soils and Sediments, 2025.
  • "Studies from Ministry of Natural Resources Describe New Findings in Chemicals and Chemistry (Influence of Soil Substrate Availability and Plant Species Diversity On Soil Microbial Biomass and Enzyme Activity In a Subalpine Natural Secondary ...)." Chemicals & Chemistry, May 16, 2025; p 3543.